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Edit File : line_editor.rb \| Size : 72.72 KB
require 'reline/kill_ring' require 'reline/unicode' require 'tempfile' class Reline::LineEditor # TODO: undo attr_reader :line attr_reader :byte_pointer attr_accessor :confirm_multiline_termination_proc attr_accessor :completion_proc attr_accessor :completion_append_character attr_accessor :output_modifier_proc attr_accessor :prompt_proc attr_accessor :auto_indent_proc attr_accessor :pre_input_hook attr_accessor :dig_perfect_match_proc attr_writer :output VI_MOTIONS = %i{ ed_prev_char ed_next_char vi_zero ed_move_to_beg ed_move_to_end vi_to_column vi_next_char vi_prev_char vi_next_word vi_prev_word vi_to_next_char vi_to_prev_char vi_end_word vi_next_big_word vi_prev_big_word vi_end_big_word vi_repeat_next_char vi_repeat_prev_char } module CompletionState NORMAL = :normal COMPLETION = :completion MENU = :menu JOURNEY = :journey MENU_WITH_PERFECT_MATCH = :menu_with_perfect_match PERFECT_MATCH = :perfect_match end CompletionJourneyData = Struct.new('CompletionJourneyData', :preposing, :postposing, :list, :pointer) MenuInfo = Struct.new('MenuInfo', :target, :list) def initialize(config, encoding) @config = config @completion_append_character = '' reset_variables(encoding: encoding) end private def check_multiline_prompt(buffer, prompt) if @vi_arg prompt = "(arg: #{@vi_arg}) " @rerender_all = true elsif @searching_prompt prompt = @searching_prompt @rerender_all = true else prompt = @prompt end if @prompt_proc prompt_list = @prompt_proc.(buffer) prompt_list.map!{ prompt } if @vi_arg or @searching_prompt if @config.show_mode_in_prompt if @config.editing_mode_is?(:vi_command) mode_icon = @config.vi_cmd_mode_icon elsif @config.editing_mode_is?(:vi_insert) mode_icon = @config.vi_ins_mode_icon elsif @config.editing_mode_is?(:emacs) mode_icon = @config.emacs_mode_string else mode_icon = '?' end prompt_list.map!{ \|pr\| mode_icon + pr } end prompt = prompt_list[@line_index] prompt_width = calculate_width(prompt, true) [prompt, prompt_width, prompt_list] else prompt_width = calculate_width(prompt, true) if @config.show_mode_in_prompt if @config.editing_mode_is?(:vi_command) mode_icon = @config.vi_cmd_mode_icon elsif @config.editing_mode_is?(:vi_insert) mode_icon = @config.vi_ins_mode_icon elsif @config.editing_mode_is?(:emacs) mode_icon = @config.emacs_mode_string else mode_icon = '?' end prompt = mode_icon + prompt end [prompt, prompt_width, nil] end end def reset(prompt = '', encoding:) @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y @screen_size = Reline::IOGate.get_screen_size reset_variables(prompt, encoding: encoding) @old_trap = Signal.trap('SIGINT') { @old_trap.call if @old_trap.respond_to?(:call) # can also be string, ex: "DEFAULT" raise Interrupt } Reline::IOGate.set_winch_handler do @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y old_screen_size = @screen_size @screen_size = Reline::IOGate.get_screen_size if old_screen_size.last < @screen_size.last # columns increase @rerender_all = true rerender else back = 0 new_buffer = whole_lines prompt, prompt_width, prompt_list = check_multiline_prompt(new_buffer, prompt) new_buffer.each_with_index do \|line, index\| prompt_width = calculate_width(prompt_list[index], true) if @prompt_proc width = prompt_width + calculate_width(line) height = calculate_height_by_width(width) back += height end @highest_in_all = back @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max) @first_line_started_from = if @line_index.zero? 0 else calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list \|\| prompt) end if @prompt_proc prompt = prompt_list[@line_index] prompt_width = calculate_width(prompt, true) end calculate_nearest_cursor @started_from = calculate_height_by_width(prompt_width + @cursor) - 1 Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last) @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max) @rerender_all = true end end end def finalize Signal.trap('SIGINT', @old_trap) end def eof? @eof end def reset_variables(prompt = '', encoding:) @prompt = prompt @mark_pointer = nil @encoding = encoding @is_multiline = false @finished = false @cleared = false @rerender_all = false @history_pointer = nil @kill_ring = Reline::KillRing.new @vi_clipboard = '' @vi_arg = nil @waiting_proc = nil @waiting_operator_proc = nil @completion_journey_data = nil @completion_state = CompletionState::NORMAL @perfect_matched = nil @menu_info = nil @first_prompt = true @searching_prompt = nil @first_char = true @eof = false reset_line end def reset_line @cursor = 0 @cursor_max = 0 @byte_pointer = 0 @buffer_of_lines = [String.new(encoding: @encoding)] @line_index = 0 @previous_line_index = nil @line = @buffer_of_lines[0] @first_line_started_from = 0 @move_up = 0 @started_from = 0 @highest_in_this = 1 @highest_in_all = 1 @line_backup_in_history = nil @multibyte_buffer = String.new(encoding: 'ASCII-8BIT') @check_new_auto_indent = false end def multiline_on @is_multiline = true end def multiline_off @is_multiline = false end private def calculate_height_by_lines(lines, prompt) result = 0 prompt_list = prompt.is_a?(Array) ? prompt : nil lines.each_with_index { \|line, i\| prompt = prompt_list[i] if prompt_list and prompt_list[i] result += calculate_height_by_width(calculate_width(prompt, true) + calculate_width(line)) } result end private def insert_new_line(cursor_line, next_line) @line = cursor_line @buffer_of_lines.insert(@line_index + 1, String.new(next_line, encoding: @encoding)) @previous_line_index = @line_index @line_index += 1 end private def calculate_height_by_width(width) width.div(@screen_size.last) + 1 end private def split_by_width(str, max_width) Reline::Unicode.split_by_width(str, max_width, @encoding) end private def scroll_down(val) if val <= @rest_height Reline::IOGate.move_cursor_down(val) @rest_height -= val else Reline::IOGate.move_cursor_down(@rest_height) Reline::IOGate.scroll_down(val - @rest_height) @rest_height = 0 end end private def move_cursor_up(val) if val > 0 Reline::IOGate.move_cursor_up(val) @rest_height += val elsif val < 0 move_cursor_down(-val) end end private def move_cursor_down(val) if val > 0 Reline::IOGate.move_cursor_down(val) @rest_height -= val @rest_height = 0 if @rest_height < 0 elsif val < 0 move_cursor_up(-val) end end private def calculate_nearest_cursor @cursor_max = calculate_width(line) new_cursor = 0 new_byte_pointer = 0 height = 1 max_width = @screen_size.last if @config.editing_mode_is?(:vi_command) last_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @line.bytesize) if last_byte_size > 0 last_mbchar = @line.byteslice(@line.bytesize - last_byte_size, last_byte_size) last_width = Reline::Unicode.get_mbchar_width(last_mbchar) cursor_max = @cursor_max - last_width else cursor_max = @cursor_max end else cursor_max = @cursor_max end @line.encode(Encoding::UTF_8).grapheme_clusters.each do \|gc\| mbchar_width = Reline::Unicode.get_mbchar_width(gc) now = new_cursor + mbchar_width if now > cursor_max or now > @cursor break end new_cursor += mbchar_width if new_cursor > max_width * height height += 1 end new_byte_pointer += gc.bytesize end @started_from = height - 1 @cursor = new_cursor @byte_pointer = new_byte_pointer end def rerender return if @line.nil? if @menu_info scroll_down(@highest_in_all - @first_line_started_from) @rerender_all = true @menu_info.list.sort!.each do \|item\| Reline::IOGate.move_cursor_column(0) @output.write item @output.flush scroll_down(1) end scroll_down(@highest_in_all - 1) move_cursor_up(@highest_in_all - 1 - @first_line_started_from) @menu_info = nil end prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines, prompt) if @cleared Reline::IOGate.clear_screen @cleared = false back = 0 modify_lines(whole_lines).each_with_index do \|line, index\| if @prompt_proc pr = prompt_list[index] height = render_partial(pr, calculate_width(pr), line, false) else height = render_partial(prompt, prompt_width, line, false) end if index < (@buffer_of_lines.size - 1) move_cursor_down(height) back += height end end move_cursor_up(back) move_cursor_down(@first_line_started_from + @started_from) Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last) return end new_highest_in_this = calculate_height_by_width(prompt_width + calculate_width(@line.nil? ? '' : @line)) # FIXME: end of logical line sometimes breaks if @previous_line_index or new_highest_in_this != @highest_in_this if @previous_line_index new_lines = whole_lines(index: @previous_line_index, line: @line) else new_lines = whole_lines end prompt, prompt_width, prompt_list = check_multiline_prompt(new_lines, prompt) all_height = calculate_height_by_lines(new_lines, prompt_list \|\| prompt) diff = all_height - @highest_in_all move_cursor_down(@highest_in_all - @first_line_started_from - @started_from - 1) if diff > 0 scroll_down(diff) move_cursor_up(all_height - 1) elsif diff < 0 (-diff).times do Reline::IOGate.move_cursor_column(0) Reline::IOGate.erase_after_cursor move_cursor_up(1) end move_cursor_up(all_height - 1) else move_cursor_up(all_height - 1) end @highest_in_all = all_height back = 0 modify_lines(new_lines).each_with_index do \|line, index\| if @prompt_proc prompt = prompt_list[index] prompt_width = calculate_width(prompt, true) end height = render_partial(prompt, prompt_width, line, false) if index < (new_lines.size - 1) scroll_down(1) back += height else back += height - 1 end end move_cursor_up(back) if @previous_line_index @buffer_of_lines[@previous_line_index] = @line @line = @buffer_of_lines[@line_index] end @first_line_started_from = if @line_index.zero? 0 else calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list \|\| prompt) end if @prompt_proc prompt = prompt_list[@line_index] prompt_width = calculate_width(prompt, true) end move_cursor_down(@first_line_started_from) calculate_nearest_cursor @started_from = calculate_height_by_width(prompt_width + @cursor) - 1 move_cursor_down(@started_from) Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last) @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max) @previous_line_index = nil rendered = true elsif @rerender_all move_cursor_up(@first_line_started_from + @started_from) Reline::IOGate.move_cursor_column(0) back = 0 new_buffer = whole_lines prompt, prompt_width, prompt_list = check_multiline_prompt(new_buffer, prompt) new_buffer.each_with_index do \|line, index\| prompt_width = calculate_width(prompt_list[index], true) if @prompt_proc width = prompt_width + calculate_width(line) height = calculate_height_by_width(width) back += height end if back > @highest_in_all scroll_down(back - 1) move_cursor_up(back - 1) elsif back < @highest_in_all scroll_down(back) Reline::IOGate.erase_after_cursor (@highest_in_all - back - 1).times do scroll_down(1) Reline::IOGate.erase_after_cursor end move_cursor_up(@highest_in_all - 1) end modify_lines(new_buffer).each_with_index do \|line, index\| if @prompt_proc prompt = prompt_list[index] prompt_width = calculate_width(prompt, true) end render_partial(prompt, prompt_width, line, false) if index < (new_buffer.size - 1) move_cursor_down(1) end end move_cursor_up(back - 1) if @prompt_proc prompt = prompt_list[@line_index] prompt_width = calculate_width(prompt, true) end @highest_in_all = back @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max) @first_line_started_from = if @line_index.zero? 0 else calculate_height_by_lines(new_buffer[0..(@line_index - 1)], prompt_list \|\| prompt) end @started_from = calculate_height_by_width(prompt_width + @cursor) - 1 move_cursor_down(@first_line_started_from + @started_from) Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last) @rerender_all = false rendered = true end line = modify_lines(whole_lines)[@line_index] if @is_multiline prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines, prompt) if finished? # Always rerender on finish because output_modifier_proc may return a different output. render_partial(prompt, prompt_width, line) scroll_down(1) Reline::IOGate.move_cursor_column(0) Reline::IOGate.erase_after_cursor elsif not rendered render_partial(prompt, prompt_width, line) end else render_partial(prompt, prompt_width, line) if finished? scroll_down(1) Reline::IOGate.move_cursor_column(0) Reline::IOGate.erase_after_cursor end end end private def render_partial(prompt, prompt_width, line_to_render, with_control = true) visual_lines, height = split_by_width(line_to_render.nil? ? prompt : prompt + line_to_render, @screen_size.last) if with_control if height > @highest_in_this diff = height - @highest_in_this scroll_down(diff) @highest_in_all += diff @highest_in_this = height move_cursor_up(diff) elsif height < @highest_in_this diff = @highest_in_this - height @highest_in_all -= diff @highest_in_this = height end move_cursor_up(@started_from) @started_from = calculate_height_by_width(prompt_width + @cursor) - 1 end Reline::IOGate.move_cursor_column(0) visual_lines.each_with_index do \|line, index\| if line.nil? if calculate_width(visual_lines[index - 1], true) == Reline::IOGate.get_screen_size.last # reaches the end of line if Reline::IOGate.win? # A newline is automatically inserted if a character is rendered at # eol on command prompt. else # When the cursor is at the end of the line and erases characters # after the cursor, some terminals delete the character at the # cursor position. move_cursor_down(1) Reline::IOGate.move_cursor_column(0) end else Reline::IOGate.erase_after_cursor move_cursor_down(1) Reline::IOGate.move_cursor_column(0) end next end @output.write line if Reline::IOGate.win? and calculate_width(line, true) == Reline::IOGate.get_screen_size.last # A newline is automatically inserted if a character is rendered at eol on command prompt. @rest_height -= 1 if @rest_height > 0 end @output.flush if @first_prompt @first_prompt = false @pre_input_hook&.call end end Reline::IOGate.erase_after_cursor if with_control # Just after rendring, so the cursor is on the last line. if finished? Reline::IOGate.move_cursor_column(0) else # Moves up from bottom of lines to the cursor position. move_cursor_up(height - 1 - @started_from) Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last) end end height end private def modify_lines(before) return before if before.nil? \|\| before.empty? if after = @output_modifier_proc&.call("#{before.join("\n")}\n", complete: finished?) after.lines("\n").map { \|l\| l.chomp('') } else before end end def editing_mode @config.editing_mode end private def menu(target, list) @menu_info = MenuInfo.new(target, list) end private def complete_internal_proc(list, is_menu) preposing, target, postposing = retrieve_completion_block list = list.select { \|i\| if i and not Encoding.compatible?(target.encoding, i.encoding) raise Encoding::CompatibilityError, "#{target.encoding.name} is not compatible with #{i.encoding.name}" end if @config.completion_ignore_case i&.downcase&.start_with?(target.downcase) else i&.start_with?(target) end } if is_menu menu(target, list) return nil end completed = list.inject { \|memo, item\| begin memo_mbchars = memo.unicode_normalize.grapheme_clusters item_mbchars = item.unicode_normalize.grapheme_clusters rescue Encoding::CompatibilityError memo_mbchars = memo.grapheme_clusters item_mbchars = item.grapheme_clusters end size = [memo_mbchars.size, item_mbchars.size].min result = '' size.times do \|i\| if @config.completion_ignore_case if memo_mbchars[i].casecmp?(item_mbchars[i]) result << memo_mbchars[i] else break end else if memo_mbchars[i] == item_mbchars[i] result << memo_mbchars[i] else break end end end result } [target, preposing, completed, postposing] end private def complete(list, just_show_list = false) case @completion_state when CompletionState::NORMAL, CompletionState::JOURNEY @completion_state = CompletionState::COMPLETION when CompletionState::PERFECT_MATCH @dig_perfect_match_proc&.(@perfect_matched) end if just_show_list is_menu = true elsif @completion_state == CompletionState::MENU is_menu = true elsif @completion_state == CompletionState::MENU_WITH_PERFECT_MATCH is_menu = true else is_menu = false end result = complete_internal_proc(list, is_menu) if @completion_state == CompletionState::MENU_WITH_PERFECT_MATCH @completion_state = CompletionState::PERFECT_MATCH end return if result.nil? target, preposing, completed, postposing = result return if completed.nil? if target <= completed and (@completion_state == CompletionState::COMPLETION) if list.include?(completed) if list.one? @completion_state = CompletionState::PERFECT_MATCH else @completion_state = CompletionState::MENU_WITH_PERFECT_MATCH end @perfect_matched = completed else @completion_state = CompletionState::MENU end if not just_show_list and target < completed @line = preposing + completed + completion_append_character.to_s + postposing line_to_pointer = preposing + completed + completion_append_character.to_s @cursor_max = calculate_width(@line) @cursor = calculate_width(line_to_pointer) @byte_pointer = line_to_pointer.bytesize end end end private def move_completed_list(list, direction) case @completion_state when CompletionState::NORMAL, CompletionState::COMPLETION, CompletionState::MENU, CompletionState::MENU_WITH_PERFECT_MATCH @completion_state = CompletionState::JOURNEY result = retrieve_completion_block return if result.nil? preposing, target, postposing = result @completion_journey_data = CompletionJourneyData.new( preposing, postposing, [target] + list.select{ \|item\| item.start_with?(target) }, 0) @completion_state = CompletionState::JOURNEY else case direction when :up @completion_journey_data.pointer -= 1 if @completion_journey_data.pointer < 0 @completion_journey_data.pointer = @completion_journey_data.list.size - 1 end when :down @completion_journey_data.pointer += 1 if @completion_journey_data.pointer >= @completion_journey_data.list.size @completion_journey_data.pointer = 0 end end completed = @completion_journey_data.list[@completion_journey_data.pointer] @line = @completion_journey_data.preposing + completed + @completion_journey_data.postposing line_to_pointer = @completion_journey_data.preposing + completed @cursor_max = calculate_width(@line) @cursor = calculate_width(line_to_pointer) @byte_pointer = line_to_pointer.bytesize end end private def run_for_operators(key, method_symbol, &block) if @waiting_operator_proc if VI_MOTIONS.include?(method_symbol) old_cursor, old_byte_pointer = @cursor, @byte_pointer block.() unless @waiting_proc cursor_diff, byte_pointer_diff = @cursor - old_cursor, @byte_pointer - old_byte_pointer @cursor, @byte_pointer = old_cursor, old_byte_pointer @waiting_operator_proc.(cursor_diff, byte_pointer_diff) else old_waiting_proc = @waiting_proc old_waiting_operator_proc = @waiting_operator_proc @waiting_proc = proc { \|k\| old_cursor, old_byte_pointer = @cursor, @byte_pointer old_waiting_proc.(k) cursor_diff, byte_pointer_diff = @cursor - old_cursor, @byte_pointer - old_byte_pointer @cursor, @byte_pointer = old_cursor, old_byte_pointer @waiting_operator_proc.(cursor_diff, byte_pointer_diff) @waiting_operator_proc = old_waiting_operator_proc } end else # Ignores operator when not motion is given. block.() end @waiting_operator_proc = nil else block.() end end private def argumentable?(method_obj) method_obj and method_obj.parameters.length != 1 end private def process_key(key, method_symbol) if method_symbol and respond_to?(method_symbol, true) method_obj = method(method_symbol) else method_obj = nil end if method_symbol and key.is_a?(Symbol) if @vi_arg and argumentable?(method_obj) run_for_operators(key, method_symbol) do method_obj.(key, arg: @vi_arg) end else method_obj&.(key) end @kill_ring.process @vi_arg = nil elsif @vi_arg if key.chr =~ /[0-9]/ ed_argument_digit(key) else if argumentable?(method_obj) run_for_operators(key, method_symbol) do method_obj.(key, arg: @vi_arg) end elsif @waiting_proc @waiting_proc.(key) elsif method_obj method_obj.(key) else ed_insert(key) end @kill_ring.process @vi_arg = nil end elsif @waiting_proc @waiting_proc.(key) @kill_ring.process elsif method_obj if method_symbol == :ed_argument_digit method_obj.(key) else run_for_operators(key, method_symbol) do method_obj.(key) end end @kill_ring.process else ed_insert(key) end end private def normal_char(key) method_symbol = method_obj = nil if key.combined_char.is_a?(Symbol) process_key(key.combined_char, key.combined_char) return end @multibyte_buffer << key.combined_char if @multibyte_buffer.size > 1 if @multibyte_buffer.dup.force_encoding(@encoding).valid_encoding? process_key(@multibyte_buffer.dup.force_encoding(@encoding), nil) @multibyte_buffer.clear else # invalid return end else # single byte return if key.char >= 128 # maybe, first byte of multi byte method_symbol = @config.editing_mode.get_method(key.combined_char) if key.with_meta and method_symbol == :ed_unassigned # split ESC + key method_symbol = @config.editing_mode.get_method("\e".ord) process_key("\e".ord, method_symbol) method_symbol = @config.editing_mode.get_method(key.char) process_key(key.char, method_symbol) else process_key(key.combined_char, method_symbol) end @multibyte_buffer.clear end if @config.editing_mode_is?(:vi_command) and @cursor > 0 and @cursor == @cursor_max byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer) @byte_pointer -= byte_size mbchar = @line.byteslice(@byte_pointer, byte_size) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor -= width end end def input_key(key) if key.char.nil? if @first_char @line = nil end finish return end @first_char = false completion_occurs = false if @config.editing_mode_is?(:emacs, :vi_insert) and key.char == "\C-i".ord unless @config.disable_completion result = call_completion_proc if result.is_a?(Array) completion_occurs = true complete(result) end end elsif not @config.disable_completion and @config.editing_mode_is?(:vi_insert) and ["\C-p".ord, "\C-n".ord].include?(key.char) unless @config.disable_completion result = call_completion_proc if result.is_a?(Array) completion_occurs = true move_completed_list(result, "\C-p".ord == key.char ? :up : :down) end end elsif Symbol === key.char and respond_to?(key.char, true) process_key(key.char, key.char) else normal_char(key) end unless completion_occurs @completion_state = CompletionState::NORMAL end if @is_multiline and @auto_indent_proc process_auto_indent end end def call_completion_proc result = retrieve_completion_block(true) slice = result[1] result = @completion_proc.(slice) if @completion_proc and slice Reline.core.instance_variable_set(:@completion_quote_character, nil) result end private def process_auto_indent return if not @check_new_auto_indent and @previous_line_index # move cursor up or down if @check_new_auto_indent and @previous_line_index and @previous_line_index > 0 and @line_index > @previous_line_index # Fix indent of a line when a newline is inserted to the next new_lines = whole_lines(index: @previous_line_index, line: @line) new_indent = @auto_indent_proc.(new_lines[0..-3].push(''), @line_index - 1, 0, true) md = @line.match(/\A /) prev_indent = md[0].count(' ') @line = ' ' new_indent + @line.lstrip new_indent = nil result = @auto_indent_proc.(new_lines[0..-2], @line_index - 1, (new_lines[-2].size + 1), false) if result new_indent = result end if new_indent&.>= 0 @line = ' ' * new_indent + @line.lstrip end end if @previous_line_index new_lines = whole_lines(index: @previous_line_index, line: @line) else new_lines = whole_lines end new_indent = @auto_indent_proc.(new_lines, @line_index, @byte_pointer, @check_new_auto_indent) if new_indent&.>= 0 md = new_lines[@line_index].match(/\A /) prev_indent = md[0].count(' ') if @check_new_auto_indent @buffer_of_lines[@line_index] = ' ' new_indent + @buffer_of_lines[@line_index].lstrip @cursor = new_indent @byte_pointer = new_indent else @line = ' ' * new_indent + @line.lstrip @cursor += new_indent - prev_indent @byte_pointer += new_indent - prev_indent end end @check_new_auto_indent = false end def retrieve_completion_block(set_completion_quote_character = false) word_break_regexp = /\A[#{Regexp.escape(Reline.completer_word_break_characters)}]/ quote_characters_regexp = /\A[#{Regexp.escape(Reline.completer_quote_characters)}]/ before = @line.byteslice(0, @byte_pointer) rest = nil break_pointer = nil quote = nil closing_quote = nil escaped_quote = nil i = 0 while i < @byte_pointer do slice = @line.byteslice(i, @byte_pointer - i) unless slice.valid_encoding? i += 1 next end if quote and slice.start_with?(closing_quote) quote = nil i += 1 rest = nil elsif quote and slice.start_with?(escaped_quote) # skip i += 2 elsif slice =~ quote_characters_regexp # find new " rest = $' quote = $& closing_quote = /(?!\\)#{Regexp.escape(quote)}/ escaped_quote = /\\#{Regexp.escape(quote)}/ i += 1 break_pointer = i - 1 elsif not quote and slice =~ word_break_regexp rest = $' i += 1 before = @line.byteslice(i, @byte_pointer - i) break_pointer = i else i += 1 end end postposing = @line.byteslice(@byte_pointer, @line.bytesize - @byte_pointer) if rest preposing = @line.byteslice(0, break_pointer) target = rest if set_completion_quote_character and quote Reline.core.instance_variable_set(:@completion_quote_character, quote) if postposing !~ /(?!\\)#{Regexp.escape(quote)}/ # closing quote insert_text(quote) end end else preposing = '' if break_pointer preposing = @line.byteslice(0, break_pointer) else preposing = '' end target = before end [preposing.encode(@encoding), target.encode(@encoding), postposing.encode(@encoding)] end def confirm_multiline_termination temp_buffer = @buffer_of_lines.dup if @previous_line_index and @line_index == (@buffer_of_lines.size - 1) temp_buffer[@previous_line_index] = @line else temp_buffer[@line_index] = @line end @confirm_multiline_termination_proc.(temp_buffer.join("\n") + "\n") end def insert_text(text) width = calculate_width(text) if @cursor == @cursor_max @line += text else @line = byteinsert(@line, @byte_pointer, text) end @byte_pointer += text.bytesize @cursor += width @cursor_max += width end def delete_text(start = nil, length = nil) if start.nil? and length.nil? @line&.clear @byte_pointer = 0 @cursor = 0 @cursor_max = 0 elsif not start.nil? and not length.nil? if @line before = @line.byteslice(0, start) after = @line.byteslice(start + length, @line.bytesize) @line = before + after @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize str = @line.byteslice(0, @byte_pointer) @cursor = calculate_width(str) @cursor_max = calculate_width(@line) end elsif start.is_a?(Range) range = start first = range.first last = range.last last = @line.bytesize - 1 if last > @line.bytesize last += @line.bytesize if last < 0 first += @line.bytesize if first < 0 range = range.exclude_end? ? first...last : first..last @line = @line.bytes.reject.with_index{ \|c, i\| range.include?(i) }.map{ \|c\| c.chr(Encoding::ASCII_8BIT) }.join.force_encoding(@encoding) @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize str = @line.byteslice(0, @byte_pointer) @cursor = calculate_width(str) @cursor_max = calculate_width(@line) else @line = @line.byteslice(0, start) @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize str = @line.byteslice(0, @byte_pointer) @cursor = calculate_width(str) @cursor_max = calculate_width(@line) end end def byte_pointer=(val) @byte_pointer = val str = @line.byteslice(0, @byte_pointer) @cursor = calculate_width(str) @cursor_max = calculate_width(@line) end def whole_lines(index: @line_index, line: @line) temp_lines = @buffer_of_lines.dup temp_lines[index] = line temp_lines end def whole_buffer if @buffer_of_lines.size == 1 and @line.nil? nil else whole_lines.join("\n") end end def finished? @finished end def finish @finished = true @config.reset end private def byteslice!(str, byte_pointer, size) new_str = str.byteslice(0, byte_pointer) new_str << str.byteslice(byte_pointer + size, str.bytesize) [new_str, str.byteslice(byte_pointer, size)] end private def byteinsert(str, byte_pointer, other) new_str = str.byteslice(0, byte_pointer) new_str << other new_str << str.byteslice(byte_pointer, str.bytesize) new_str end private def calculate_width(str, allow_escape_code = false) Reline::Unicode.calculate_width(str, allow_escape_code) end private def key_delete(key) if @config.editing_mode_is?(:vi_insert, :emacs) ed_delete_next_char(key) end end private def key_newline(key) if @is_multiline next_line = @line.byteslice(@byte_pointer, @line.bytesize - @byte_pointer) cursor_line = @line.byteslice(0, @byte_pointer) insert_new_line(cursor_line, next_line) @cursor = 0 @check_new_auto_indent = true end end private def ed_unassigned(key) end # do nothing private def ed_insert(key) if key.instance_of?(String) begin key.encode(Encoding::UTF_8) rescue Encoding::UndefinedConversionError return end width = Reline::Unicode.get_mbchar_width(key) if @cursor == @cursor_max @line += key else @line = byteinsert(@line, @byte_pointer, key) end @byte_pointer += key.bytesize @cursor += width @cursor_max += width else begin key.chr.encode(Encoding::UTF_8) rescue Encoding::UndefinedConversionError return end if @cursor == @cursor_max @line += key.chr else @line = byteinsert(@line, @byte_pointer, key.chr) end width = Reline::Unicode.get_mbchar_width(key.chr) @byte_pointer += 1 @cursor += width @cursor_max += width end end alias_method :ed_digit, :ed_insert alias_method :self_insert, :ed_insert private def ed_quoted_insert(str, arg: 1) @waiting_proc = proc { \|key\| arg.times do if key == "\C-j".ord or key == "\C-m".ord key_newline(key) else ed_insert(key) end end @waiting_proc = nil } end alias_method :quoted_insert, :ed_quoted_insert private def ed_next_char(key, arg: 1) byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer) if (@byte_pointer < @line.bytesize) mbchar = @line.byteslice(@byte_pointer, byte_size) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor += width if width @byte_pointer += byte_size elsif @is_multiline and @config.editing_mode_is?(:emacs) and @byte_pointer == @line.bytesize and @line_index < @buffer_of_lines.size - 1 next_line = @buffer_of_lines[@line_index + 1] @cursor = 0 @byte_pointer = 0 @cursor_max = calculate_width(next_line) @previous_line_index = @line_index @line_index += 1 end arg -= 1 ed_next_char(key, arg: arg) if arg > 0 end alias_method :forward_char, :ed_next_char private def ed_prev_char(key, arg: 1) if @cursor > 0 byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer) @byte_pointer -= byte_size mbchar = @line.byteslice(@byte_pointer, byte_size) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor -= width elsif @is_multiline and @config.editing_mode_is?(:emacs) and @byte_pointer == 0 and @line_index > 0 prev_line = @buffer_of_lines[@line_index - 1] @cursor = calculate_width(prev_line) @byte_pointer = prev_line.bytesize @cursor_max = calculate_width(prev_line) @previous_line_index = @line_index @line_index -= 1 end arg -= 1 ed_prev_char(key, arg: arg) if arg > 0 end private def vi_first_print(key) @byte_pointer, @cursor = Reline::Unicode.vi_first_print(@line) end private def ed_move_to_beg(key) @byte_pointer = @cursor = 0 end alias_method :beginning_of_line, :ed_move_to_beg private def ed_move_to_end(key) @byte_pointer = 0 @cursor = 0 byte_size = 0 while @byte_pointer < @line.bytesize byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer) if byte_size > 0 mbchar = @line.byteslice(@byte_pointer, byte_size) @cursor += Reline::Unicode.get_mbchar_width(mbchar) end @byte_pointer += byte_size end end alias_method :end_of_line, :ed_move_to_end private def generate_searcher Fiber.new do \|first_key\| prev_search_key = first_key search_word = String.new(encoding: @encoding) multibyte_buf = String.new(encoding: 'ASCII-8BIT') last_hit = nil case first_key when "\C-r".ord prompt_name = 'reverse-i-search' when "\C-s".ord prompt_name = 'i-search' end loop do key = Fiber.yield(search_word) search_again = false case key when -1 # determined Reline.last_incremental_search = search_word break when "\C-h".ord, "\C-?".ord grapheme_clusters = search_word.grapheme_clusters if grapheme_clusters.size > 0 grapheme_clusters.pop search_word = grapheme_clusters.join end when "\C-r".ord, "\C-s".ord search_again = true if prev_search_key == key prev_search_key = key else multibyte_buf << key if multibyte_buf.dup.force_encoding(@encoding).valid_encoding? search_word << multibyte_buf.dup.force_encoding(@encoding) multibyte_buf.clear end end hit = nil if not search_word.empty? and @line_backup_in_history&.include?(search_word) @history_pointer = nil hit = @line_backup_in_history else if search_again if search_word.empty? and Reline.last_incremental_search search_word = Reline.last_incremental_search end if @history_pointer case prev_search_key when "\C-r".ord history_pointer_base = 0 history = Reline::HISTORY[0..(@history_pointer - 1)] when "\C-s".ord history_pointer_base = @history_pointer + 1 history = Reline::HISTORY[(@history_pointer + 1)..-1] end else history_pointer_base = 0 history = Reline::HISTORY end elsif @history_pointer case prev_search_key when "\C-r".ord history_pointer_base = 0 history = Reline::HISTORY[0..@history_pointer] when "\C-s".ord history_pointer_base = @history_pointer history = Reline::HISTORY[@history_pointer..-1] end else history_pointer_base = 0 history = Reline::HISTORY end case prev_search_key when "\C-r".ord hit_index = history.rindex { \|item\| item.include?(search_word) } when "\C-s".ord hit_index = history.index { \|item\| item.include?(search_word) } end if hit_index @history_pointer = history_pointer_base + hit_index hit = Reline::HISTORY[@history_pointer] end end case prev_search_key when "\C-r".ord prompt_name = 'reverse-i-search' when "\C-s".ord prompt_name = 'i-search' end if hit if @is_multiline @buffer_of_lines = hit.split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = @buffer_of_lines.size - 1 @line = @buffer_of_lines.last @rerender_all = true @searching_prompt = "(%s)`%s'" % [prompt_name, search_word] else @line = hit @searching_prompt = "(%s)`%s': %s" % [prompt_name, search_word, hit] end last_hit = hit else if @is_multiline @rerender_all = true @searching_prompt = "(failed %s)`%s'" % [prompt_name, search_word] else @searching_prompt = "(failed %s)`%s': %s" % [prompt_name, search_word, last_hit] end end end end end private def incremental_search_history(key) unless @history_pointer if @is_multiline @line_backup_in_history = whole_buffer else @line_backup_in_history = @line end end searcher = generate_searcher searcher.resume(key) @searching_prompt = "(reverse-i-search)`': " @waiting_proc = ->(k) { case k when "\C-j".ord if @history_pointer buffer = Reline::HISTORY[@history_pointer] else buffer = @line_backup_in_history end if @is_multiline @buffer_of_lines = buffer.split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = @buffer_of_lines.size - 1 @line = @buffer_of_lines.last @rerender_all = true else @line = buffer end @searching_prompt = nil @waiting_proc = nil @cursor_max = calculate_width(@line) @cursor = @byte_pointer = 0 searcher.resume(-1) when "\C-g".ord if @is_multiline @buffer_of_lines = @line_backup_in_history.split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = @buffer_of_lines.size - 1 @line = @buffer_of_lines.last @rerender_all = true else @line = @line_backup_in_history end @history_pointer = nil @searching_prompt = nil @waiting_proc = nil @line_backup_in_history = nil @cursor_max = calculate_width(@line) @cursor = @byte_pointer = 0 @rerender_all = true else chr = k.is_a?(String) ? k : k.chr(Encoding::ASCII_8BIT) if chr.match?(/[[:print:]]/) or k == "\C-h".ord or k == "\C-?".ord or k == "\C-r".ord or k == "\C-s".ord searcher.resume(k) else if @history_pointer line = Reline::HISTORY[@history_pointer] else line = @line_backup_in_history end if @is_multiline @line_backup_in_history = whole_buffer @buffer_of_lines = line.split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = @buffer_of_lines.size - 1 @line = @buffer_of_lines.last @rerender_all = true else @line_backup_in_history = @line @line = line end @searching_prompt = nil @waiting_proc = nil @cursor_max = calculate_width(@line) @cursor = @byte_pointer = 0 searcher.resume(-1) end end } end private def vi_search_prev(key) incremental_search_history(key) end alias_method :reverse_search_history, :vi_search_prev private def vi_search_next(key) incremental_search_history(key) end alias_method :forward_search_history, :vi_search_next private def ed_search_prev_history(key, arg: 1) history = nil h_pointer = nil line_no = nil substr = @line.slice(0, @byte_pointer) if @history_pointer.nil? return if not @line.empty? and substr.empty? history = Reline::HISTORY elsif @history_pointer.zero? history = nil h_pointer = nil else history = Reline::HISTORY.slice(0, @history_pointer) end return if history.nil? if @is_multiline h_pointer = history.rindex { \|h\| h.split("\n").each_with_index { \|l, i\| if l.start_with?(substr) line_no = i break end } not line_no.nil? } else h_pointer = history.rindex { \|l\| l.start_with?(substr) } end return if h_pointer.nil? @history_pointer = h_pointer if @is_multiline @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = line_no @line = @buffer_of_lines.last @rerender_all = true else @line = Reline::HISTORY[@history_pointer] end @cursor_max = calculate_width(@line) arg -= 1 ed_search_prev_history(key, arg: arg) if arg > 0 end alias_method :history_search_backward, :ed_search_prev_history private def ed_search_next_history(key, arg: 1) substr = @line.slice(0, @byte_pointer) if @history_pointer.nil? return elsif @history_pointer == (Reline::HISTORY.size - 1) and not substr.empty? return end history = Reline::HISTORY.slice((@history_pointer + 1)..-1) h_pointer = nil line_no = nil if @is_multiline h_pointer = history.index { \|h\| h.split("\n").each_with_index { \|l, i\| if l.start_with?(substr) line_no = i break end } not line_no.nil? } else h_pointer = history.index { \|l\| l.start_with?(substr) } end h_pointer += @history_pointer + 1 if h_pointer and @history_pointer return if h_pointer.nil? and not substr.empty? @history_pointer = h_pointer if @is_multiline if @history_pointer.nil? and substr.empty? @buffer_of_lines = [] @line_index = 0 else @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n") @line_index = line_no end @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line = @buffer_of_lines.last @rerender_all = true else if @history_pointer.nil? and substr.empty? @line = '' else @line = Reline::HISTORY[@history_pointer] end end @cursor_max = calculate_width(@line) arg -= 1 ed_search_next_history(key, arg: arg) if arg > 0 end alias_method :history_search_forward, :ed_search_next_history private def ed_prev_history(key, arg: 1) if @is_multiline and @line_index > 0 @previous_line_index = @line_index @line_index -= 1 return end if Reline::HISTORY.empty? return end if @history_pointer.nil? @history_pointer = Reline::HISTORY.size - 1 if @is_multiline @line_backup_in_history = whole_buffer @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = @buffer_of_lines.size - 1 @line = @buffer_of_lines.last @rerender_all = true else @line_backup_in_history = @line @line = Reline::HISTORY[@history_pointer] end elsif @history_pointer.zero? return else if @is_multiline Reline::HISTORY[@history_pointer] = whole_buffer @history_pointer -= 1 @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = @buffer_of_lines.size - 1 @line = @buffer_of_lines.last @rerender_all = true else Reline::HISTORY[@history_pointer] = @line @history_pointer -= 1 @line = Reline::HISTORY[@history_pointer] end end if @config.editing_mode_is?(:emacs, :vi_insert) @cursor_max = @cursor = calculate_width(@line) @byte_pointer = @line.bytesize elsif @config.editing_mode_is?(:vi_command) @byte_pointer = @cursor = 0 @cursor_max = calculate_width(@line) end arg -= 1 ed_prev_history(key, arg: arg) if arg > 0 end private def ed_next_history(key, arg: 1) if @is_multiline and @line_index < (@buffer_of_lines.size - 1) @previous_line_index = @line_index @line_index += 1 return end if @history_pointer.nil? return elsif @history_pointer == (Reline::HISTORY.size - 1) if @is_multiline @history_pointer = nil @buffer_of_lines = @line_backup_in_history.split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = 0 @line = @buffer_of_lines.first @rerender_all = true else @history_pointer = nil @line = @line_backup_in_history end else if @is_multiline Reline::HISTORY[@history_pointer] = whole_buffer @history_pointer += 1 @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n") @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty? @line_index = 0 @line = @buffer_of_lines.first @rerender_all = true else Reline::HISTORY[@history_pointer] = @line @history_pointer += 1 @line = Reline::HISTORY[@history_pointer] end end @line = '' unless @line if @config.editing_mode_is?(:emacs, :vi_insert) @cursor_max = @cursor = calculate_width(@line) @byte_pointer = @line.bytesize elsif @config.editing_mode_is?(:vi_command) @byte_pointer = @cursor = 0 @cursor_max = calculate_width(@line) end arg -= 1 ed_next_history(key, arg: arg) if arg > 0 end private def ed_newline(key) if @is_multiline if @config.editing_mode_is?(:vi_command) if @line_index < (@buffer_of_lines.size - 1) ed_next_history(key) # means cursor down else # should check confirm_multiline_termination to finish? finish end else if @line_index == (@buffer_of_lines.size - 1) if confirm_multiline_termination finish else key_newline(key) end else # should check confirm_multiline_termination to finish? @previous_line_index = @line_index @line_index = @buffer_of_lines.size - 1 finish end end else if @history_pointer Reline::HISTORY[@history_pointer] = @line @history_pointer = nil end finish end end private def em_delete_prev_char(key) if @is_multiline and @cursor == 0 and @line_index > 0 @buffer_of_lines[@line_index] = @line @cursor = calculate_width(@buffer_of_lines[@line_index - 1]) @byte_pointer = @buffer_of_lines[@line_index - 1].bytesize @buffer_of_lines[@line_index - 1] += @buffer_of_lines.delete_at(@line_index) @line_index -= 1 @line = @buffer_of_lines[@line_index] @cursor_max = calculate_width(@line) @rerender_all = true elsif @cursor > 0 byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer) @byte_pointer -= byte_size @line, mbchar = byteslice!(@line, @byte_pointer, byte_size) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor -= width @cursor_max -= width end end alias_method :backward_delete_char, :em_delete_prev_char private def ed_kill_line(key) if @line.bytesize > @byte_pointer @line, deleted = byteslice!(@line, @byte_pointer, @line.bytesize - @byte_pointer) @byte_pointer = @line.bytesize @cursor = @cursor_max = calculate_width(@line) @kill_ring.append(deleted) elsif @is_multiline and @byte_pointer == @line.bytesize and @buffer_of_lines.size > @line_index + 1 @cursor = calculate_width(@line) @byte_pointer = @line.bytesize @line += @buffer_of_lines.delete_at(@line_index + 1) @cursor_max = calculate_width(@line) @buffer_of_lines[@line_index] = @line @rerender_all = true @rest_height += 1 end end private def em_kill_line(key) if @byte_pointer > 0 @line, deleted = byteslice!(@line, 0, @byte_pointer) @byte_pointer = 0 @kill_ring.append(deleted, true) @cursor_max = calculate_width(@line) @cursor = 0 end end private def em_delete(key) if (not @is_multiline and @line.empty?) or (@is_multiline and @line.empty? and @buffer_of_lines.size == 1) @line = nil if @buffer_of_lines.size > 1 scroll_down(@highest_in_all - @first_line_started_from) end Reline::IOGate.move_cursor_column(0) @eof = true finish elsif @byte_pointer < @line.bytesize splitted_last = @line.byteslice(@byte_pointer, @line.bytesize) mbchar = splitted_last.grapheme_clusters.first width = Reline::Unicode.get_mbchar_width(mbchar) @cursor_max -= width @line, = byteslice!(@line, @byte_pointer, mbchar.bytesize) elsif @is_multiline and @byte_pointer == @line.bytesize and @buffer_of_lines.size > @line_index + 1 @cursor = calculate_width(@line) @byte_pointer = @line.bytesize @line += @buffer_of_lines.delete_at(@line_index + 1) @cursor_max = calculate_width(@line) @buffer_of_lines[@line_index] = @line @rerender_all = true @rest_height += 1 end end alias_method :delete_char, :em_delete private def em_delete_or_list(key) if @line.empty? or @byte_pointer < @line.bytesize em_delete(key) else # show completed list result = call_completion_proc if result.is_a?(Array) complete(result, true) end end end alias_method :delete_char_or_list, :em_delete_or_list private def em_yank(key) yanked = @kill_ring.yank if yanked @line = byteinsert(@line, @byte_pointer, yanked) yanked_width = calculate_width(yanked) @cursor += yanked_width @cursor_max += yanked_width @byte_pointer += yanked.bytesize end end private def em_yank_pop(key) yanked, prev_yank = @kill_ring.yank_pop if yanked prev_yank_width = calculate_width(prev_yank) @cursor -= prev_yank_width @cursor_max -= prev_yank_width @byte_pointer -= prev_yank.bytesize @line, = byteslice!(@line, @byte_pointer, prev_yank.bytesize) @line = byteinsert(@line, @byte_pointer, yanked) yanked_width = calculate_width(yanked) @cursor += yanked_width @cursor_max += yanked_width @byte_pointer += yanked.bytesize end end private def ed_clear_screen(key) @cleared = true end alias_method :clear_screen, :ed_clear_screen private def em_next_word(key) if @line.bytesize > @byte_pointer byte_size, width = Reline::Unicode.em_forward_word(@line, @byte_pointer) @byte_pointer += byte_size @cursor += width end end alias_method :forward_word, :em_next_word private def ed_prev_word(key) if @byte_pointer > 0 byte_size, width = Reline::Unicode.em_backward_word(@line, @byte_pointer) @byte_pointer -= byte_size @cursor -= width end end alias_method :backward_word, :ed_prev_word private def em_delete_next_word(key) if @line.bytesize > @byte_pointer byte_size, width = Reline::Unicode.em_forward_word(@line, @byte_pointer) @line, word = byteslice!(@line, @byte_pointer, byte_size) @kill_ring.append(word) @cursor_max -= width end end private def ed_delete_prev_word(key) if @byte_pointer > 0 byte_size, width = Reline::Unicode.em_backward_word(@line, @byte_pointer) @line, word = byteslice!(@line, @byte_pointer - byte_size, byte_size) @kill_ring.append(word, true) @byte_pointer -= byte_size @cursor -= width @cursor_max -= width end end private def ed_transpose_chars(key) if @byte_pointer > 0 if @cursor_max > @cursor byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer) mbchar = @line.byteslice(@byte_pointer, byte_size) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor += width @byte_pointer += byte_size end back1_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer) if (@byte_pointer - back1_byte_size) > 0 back2_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer - back1_byte_size) back2_pointer = @byte_pointer - back1_byte_size - back2_byte_size @line, back2_mbchar = byteslice!(@line, back2_pointer, back2_byte_size) @line = byteinsert(@line, @byte_pointer - back2_byte_size, back2_mbchar) end end end alias_method :transpose_chars, :ed_transpose_chars private def ed_transpose_words(key) left_word_start, middle_start, right_word_start, after_start = Reline::Unicode.ed_transpose_words(@line, @byte_pointer) before = @line.byteslice(0, left_word_start) left_word = @line.byteslice(left_word_start, middle_start - left_word_start) middle = @line.byteslice(middle_start, right_word_start - middle_start) right_word = @line.byteslice(right_word_start, after_start - right_word_start) after = @line.byteslice(after_start, @line.bytesize - after_start) return if left_word.empty? or right_word.empty? @line = before + right_word + middle + left_word + after from_head_to_left_word = before + right_word + middle + left_word @byte_pointer = from_head_to_left_word.bytesize @cursor = calculate_width(from_head_to_left_word) end alias_method :transpose_words, :ed_transpose_words private def em_capitol_case(key) if @line.bytesize > @byte_pointer byte_size, _, new_str = Reline::Unicode.em_forward_word_with_capitalization(@line, @byte_pointer) before = @line.byteslice(0, @byte_pointer) after = @line.byteslice((@byte_pointer + byte_size)..-1) @line = before + new_str + after @byte_pointer += new_str.bytesize @cursor += calculate_width(new_str) end end alias_method :capitalize_word, :em_capitol_case private def em_lower_case(key) if @line.bytesize > @byte_pointer byte_size, = Reline::Unicode.em_forward_word(@line, @byte_pointer) part = @line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { \|mbchar\| mbchar =~ /[A-Z]/ ? mbchar.downcase : mbchar }.join rest = @line.byteslice((@byte_pointer + byte_size)..-1) @line = @line.byteslice(0, @byte_pointer) + part @byte_pointer = @line.bytesize @cursor = calculate_width(@line) @cursor_max = @cursor + calculate_width(rest) @line += rest end end alias_method :downcase_word, :em_lower_case private def em_upper_case(key) if @line.bytesize > @byte_pointer byte_size, = Reline::Unicode.em_forward_word(@line, @byte_pointer) part = @line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { \|mbchar\| mbchar =~ /[a-z]/ ? mbchar.upcase : mbchar }.join rest = @line.byteslice((@byte_pointer + byte_size)..-1) @line = @line.byteslice(0, @byte_pointer) + part @byte_pointer = @line.bytesize @cursor = calculate_width(@line) @cursor_max = @cursor + calculate_width(rest) @line += rest end end alias_method :upcase_word, :em_upper_case private def em_kill_region(key) if @byte_pointer > 0 byte_size, width = Reline::Unicode.em_big_backward_word(@line, @byte_pointer) @line, deleted = byteslice!(@line, @byte_pointer - byte_size, byte_size) @byte_pointer -= byte_size @cursor -= width @cursor_max -= width @kill_ring.append(deleted) end end private def copy_for_vi(text) if @config.editing_mode_is?(:vi_insert) or @config.editing_mode_is?(:vi_command) @vi_clipboard = text end end private def vi_insert(key) @config.editing_mode = :vi_insert end private def vi_add(key) @config.editing_mode = :vi_insert ed_next_char(key) end private def vi_command_mode(key) ed_prev_char(key) @config.editing_mode = :vi_command end alias_method :backward_char, :ed_prev_char private def vi_next_word(key, arg: 1) if @line.bytesize > @byte_pointer byte_size, width = Reline::Unicode.vi_forward_word(@line, @byte_pointer) @byte_pointer += byte_size @cursor += width end arg -= 1 vi_next_word(key, arg: arg) if arg > 0 end private def vi_prev_word(key, arg: 1) if @byte_pointer > 0 byte_size, width = Reline::Unicode.vi_backward_word(@line, @byte_pointer) @byte_pointer -= byte_size @cursor -= width end arg -= 1 vi_prev_word(key, arg: arg) if arg > 0 end private def vi_end_word(key, arg: 1) if @line.bytesize > @byte_pointer byte_size, width = Reline::Unicode.vi_forward_end_word(@line, @byte_pointer) @byte_pointer += byte_size @cursor += width end arg -= 1 vi_end_word(key, arg: arg) if arg > 0 end private def vi_next_big_word(key, arg: 1) if @line.bytesize > @byte_pointer byte_size, width = Reline::Unicode.vi_big_forward_word(@line, @byte_pointer) @byte_pointer += byte_size @cursor += width end arg -= 1 vi_next_big_word(key, arg: arg) if arg > 0 end private def vi_prev_big_word(key, arg: 1) if @byte_pointer > 0 byte_size, width = Reline::Unicode.vi_big_backward_word(@line, @byte_pointer) @byte_pointer -= byte_size @cursor -= width end arg -= 1 vi_prev_big_word(key, arg: arg) if arg > 0 end private def vi_end_big_word(key, arg: 1) if @line.bytesize > @byte_pointer byte_size, width = Reline::Unicode.vi_big_forward_end_word(@line, @byte_pointer) @byte_pointer += byte_size @cursor += width end arg -= 1 vi_end_big_word(key, arg: arg) if arg > 0 end private def vi_delete_prev_char(key) if @is_multiline and @cursor == 0 and @line_index > 0 @buffer_of_lines[@line_index] = @line @cursor = calculate_width(@buffer_of_lines[@line_index - 1]) @byte_pointer = @buffer_of_lines[@line_index - 1].bytesize @buffer_of_lines[@line_index - 1] += @buffer_of_lines.delete_at(@line_index) @line_index -= 1 @line = @buffer_of_lines[@line_index] @cursor_max = calculate_width(@line) @rerender_all = true elsif @cursor > 0 byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer) @byte_pointer -= byte_size @line, mbchar = byteslice!(@line, @byte_pointer, byte_size) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor -= width @cursor_max -= width end end private def vi_insert_at_bol(key) ed_move_to_beg(key) @config.editing_mode = :vi_insert end private def vi_add_at_eol(key) ed_move_to_end(key) @config.editing_mode = :vi_insert end private def ed_delete_prev_char(key, arg: 1) deleted = '' arg.times do if @cursor > 0 byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer) @byte_pointer -= byte_size @line, mbchar = byteslice!(@line, @byte_pointer, byte_size) deleted.prepend(mbchar) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor -= width @cursor_max -= width end end copy_for_vi(deleted) end private def vi_zero(key) @byte_pointer = 0 @cursor = 0 end private def vi_change_meta(key) @waiting_operator_proc = proc { \|cursor_diff, byte_pointer_diff\| if byte_pointer_diff > 0 @line, cut = byteslice!(@line, @byte_pointer, byte_pointer_diff) elsif byte_pointer_diff < 0 @line, cut = byteslice!(@line, @byte_pointer + byte_pointer_diff, -byte_pointer_diff) end copy_for_vi(cut) @cursor += cursor_diff if cursor_diff < 0 @cursor_max -= cursor_diff.abs @byte_pointer += byte_pointer_diff if byte_pointer_diff < 0 @config.editing_mode = :vi_insert } end private def vi_delete_meta(key) @waiting_operator_proc = proc { \|cursor_diff, byte_pointer_diff\| if byte_pointer_diff > 0 @line, cut = byteslice!(@line, @byte_pointer, byte_pointer_diff) elsif byte_pointer_diff < 0 @line, cut = byteslice!(@line, @byte_pointer + byte_pointer_diff, -byte_pointer_diff) end copy_for_vi(cut) @cursor += cursor_diff if cursor_diff < 0 @cursor_max -= cursor_diff.abs @byte_pointer += byte_pointer_diff if byte_pointer_diff < 0 } end private def vi_yank(key) end private def vi_list_or_eof(key) if (not @is_multiline and @line.empty?) or (@is_multiline and @line.empty? and @buffer_of_lines.size == 1) @line = nil if @buffer_of_lines.size > 1 scroll_down(@highest_in_all - @first_line_started_from) end Reline::IOGate.move_cursor_column(0) @eof = true finish else ed_newline(key) end end alias_method :vi_end_of_transmission, :vi_list_or_eof alias_method :vi_eof_maybe, :vi_list_or_eof private def ed_delete_next_char(key, arg: 1) byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer) unless @line.empty? \|\| byte_size == 0 @line, mbchar = byteslice!(@line, @byte_pointer, byte_size) copy_for_vi(mbchar) width = Reline::Unicode.get_mbchar_width(mbchar) @cursor_max -= width if @cursor > 0 and @cursor >= @cursor_max @byte_pointer -= byte_size @cursor -= width end end arg -= 1 ed_delete_next_char(key, arg: arg) if arg > 0 end private def vi_to_history_line(key) if Reline::HISTORY.empty? return end if @history_pointer.nil? @history_pointer = 0 @line_backup_in_history = @line @line = Reline::HISTORY[@history_pointer] @cursor_max = calculate_width(@line) @cursor = 0 @byte_pointer = 0 elsif @history_pointer.zero? return else Reline::HISTORY[@history_pointer] = @line @history_pointer = 0 @line = Reline::HISTORY[@history_pointer] @cursor_max = calculate_width(@line) @cursor = 0 @byte_pointer = 0 end end private def vi_histedit(key) path = Tempfile.open { \|fp\| fp.write @line fp.path } system("#{ENV['EDITOR']} #{path}") @line = File.read(path) finish end private def vi_paste_prev(key, arg: 1) if @vi_clipboard.size > 0 @line = byteinsert(@line, @byte_pointer, @vi_clipboard) @cursor_max += calculate_width(@vi_clipboard) cursor_point = @vi_clipboard.grapheme_clusters[0..-2].join @cursor += calculate_width(cursor_point) @byte_pointer += cursor_point.bytesize end arg -= 1 vi_paste_prev(key, arg: arg) if arg > 0 end private def vi_paste_next(key, arg: 1) if @vi_clipboard.size > 0 byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer) @line = byteinsert(@line, @byte_pointer + byte_size, @vi_clipboard) @cursor_max += calculate_width(@vi_clipboard) @cursor += calculate_width(@vi_clipboard) @byte_pointer += @vi_clipboard.bytesize end arg -= 1 vi_paste_next(key, arg: arg) if arg > 0 end private def ed_argument_digit(key) if @vi_arg.nil? unless key.chr.to_i.zero? @vi_arg = key.chr.to_i end else @vi_arg = @vi_arg * 10 + key.chr.to_i end end private def vi_to_column(key, arg: 0) @byte_pointer, @cursor = @line.grapheme_clusters.inject([0, 0]) { \|total, gc\| # total has [byte_size, cursor] mbchar_width = Reline::Unicode.get_mbchar_width(gc) if (total.last + mbchar_width) >= arg break total elsif (total.last + mbchar_width) >= @cursor_max break total else total = [total.first + gc.bytesize, total.last + mbchar_width] total end } end private def vi_replace_char(key, arg: 1) @waiting_proc = ->(k) { if arg == 1 byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer) before = @line.byteslice(0, @byte_pointer) remaining_point = @byte_pointer + byte_size after = @line.byteslice(remaining_point, @line.size - remaining_point) @line = before + k.chr + after @cursor_max = calculate_width(@line) @waiting_proc = nil elsif arg > 1 byte_size = 0 arg.times do byte_size += Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer + byte_size) end before = @line.byteslice(0, @byte_pointer) remaining_point = @byte_pointer + byte_size after = @line.byteslice(remaining_point, @line.size - remaining_point) replaced = k.chr * arg @line = before + replaced + after @byte_pointer += replaced.bytesize @cursor += calculate_width(replaced) @cursor_max = calculate_width(@line) @waiting_proc = nil end } end private def vi_next_char(key, arg: 1) @waiting_proc = ->(key_for_proc) { search_next_char(key_for_proc, arg) } end private def vi_to_next_char(key, arg: 1) @waiting_proc = ->(key_for_proc) { search_next_char(key_for_proc, arg, true) } end private def search_next_char(key, arg, need_prev_char = false) if key.instance_of?(String) inputed_char = key else inputed_char = key.chr end prev_total = nil total = nil found = false @line.byteslice(@byte_pointer..-1).grapheme_clusters.each do \|mbchar\| # total has [byte_size, cursor] unless total # skip cursor point width = Reline::Unicode.get_mbchar_width(mbchar) total = [mbchar.bytesize, width] else if inputed_char == mbchar arg -= 1 if arg.zero? found = true break end end width = Reline::Unicode.get_mbchar_width(mbchar) prev_total = total total = [total.first + mbchar.bytesize, total.last + width] end end if not need_prev_char and found and total byte_size, width = total @byte_pointer += byte_size @cursor += width elsif need_prev_char and found and prev_total byte_size, width = prev_total @byte_pointer += byte_size @cursor += width end @waiting_proc = nil end private def vi_prev_char(key, arg: 1) @waiting_proc = ->(key_for_proc) { search_prev_char(key_for_proc, arg) } end private def vi_to_prev_char(key, arg: 1) @waiting_proc = ->(key_for_proc) { search_prev_char(key_for_proc, arg, true) } end private def search_prev_char(key, arg, need_next_char = false) if key.instance_of?(String) inputed_char = key else inputed_char = key.chr end prev_total = nil total = nil found = false @line.byteslice(0..@byte_pointer).grapheme_clusters.reverse_each do \|mbchar\| # total has [byte_size, cursor] unless total # skip cursor point width = Reline::Unicode.get_mbchar_width(mbchar) total = [mbchar.bytesize, width] else if inputed_char == mbchar arg -= 1 if arg.zero? found = true break end end width = Reline::Unicode.get_mbchar_width(mbchar) prev_total = total total = [total.first + mbchar.bytesize, total.last + width] end end if not need_next_char and found and total byte_size, width = total @byte_pointer -= byte_size @cursor -= width elsif need_next_char and found and prev_total byte_size, width = prev_total @byte_pointer -= byte_size @cursor -= width end @waiting_proc = nil end private def vi_join_lines(key, arg: 1) if @is_multiline and @buffer_of_lines.size > @line_index + 1 @cursor = calculate_width(@line) @byte_pointer = @line.bytesize @line += ' ' + @buffer_of_lines.delete_at(@line_index + 1).lstrip @cursor_max = calculate_width(@line) @buffer_of_lines[@line_index] = @line @rerender_all = true @rest_height += 1 end arg -= 1 vi_join_lines(key, arg: arg) if arg > 0 end private def em_set_mark(key) @mark_pointer = [@byte_pointer, @line_index] end alias_method :set_mark, :em_set_mark private def em_exchange_mark(key) new_pointer = [@byte_pointer, @line_index] @previous_line_index = @line_index @byte_pointer, @line_index = @mark_pointer @cursor = calculate_width(@line.byteslice(0, @byte_pointer)) @cursor_max = calculate_width(@line) @mark_pointer = new_pointer end alias_method :exchange_point_and_mark, :em_exchange_mark end Back

Edit File : line_editor.rb | Size : 72.72 KB

require 'reline/kill_ring'
require 'reline/unicode'

require 'tempfile'

class Reline::LineEditor
  # TODO: undo
  attr_reader :line
  attr_reader :byte_pointer
  attr_accessor :confirm_multiline_termination_proc
  attr_accessor :completion_proc
  attr_accessor :completion_append_character
  attr_accessor :output_modifier_proc
  attr_accessor :prompt_proc
  attr_accessor :auto_indent_proc
  attr_accessor :pre_input_hook
  attr_accessor :dig_perfect_match_proc
  attr_writer :output

VI_MOTIONS = %i{
    ed_prev_char
    ed_next_char
    vi_zero
    ed_move_to_beg
    ed_move_to_end
    vi_to_column
    vi_next_char
    vi_prev_char
    vi_next_word
    vi_prev_word
    vi_to_next_char
    vi_to_prev_char
    vi_end_word
    vi_next_big_word
    vi_prev_big_word
    vi_end_big_word
    vi_repeat_next_char
    vi_repeat_prev_char
  }

module CompletionState
    NORMAL = :normal
    COMPLETION = :completion
    MENU = :menu
    JOURNEY = :journey
    MENU_WITH_PERFECT_MATCH = :menu_with_perfect_match
    PERFECT_MATCH = :perfect_match
  end

CompletionJourneyData = Struct.new('CompletionJourneyData', :preposing, :postposing, :list, :pointer)
  MenuInfo = Struct.new('MenuInfo', :target, :list)

def initialize(config, encoding)
    @config = config
    @completion_append_character = ''
    reset_variables(encoding: encoding)
  end

private def check_multiline_prompt(buffer, prompt)
    if @vi_arg
      prompt = "(arg: #{@vi_arg}) "
      @rerender_all = true
    elsif @searching_prompt
      prompt = @searching_prompt
      @rerender_all = true
    else
      prompt = @prompt
    end
    if @prompt_proc
      prompt_list = @prompt_proc.(buffer)
      prompt_list.map!{ prompt } if @vi_arg or @searching_prompt
      if @config.show_mode_in_prompt
        if @config.editing_mode_is?(:vi_command)
          mode_icon = @config.vi_cmd_mode_icon
        elsif @config.editing_mode_is?(:vi_insert)
          mode_icon = @config.vi_ins_mode_icon
        elsif @config.editing_mode_is?(:emacs)
          mode_icon = @config.emacs_mode_string
        else
          mode_icon = '?'
        end
        prompt_list.map!{ |pr| mode_icon + pr }
      end
      prompt = prompt_list[@line_index]
      prompt_width = calculate_width(prompt, true)
      [prompt, prompt_width, prompt_list]
    else
      prompt_width = calculate_width(prompt, true)
      if @config.show_mode_in_prompt
        if @config.editing_mode_is?(:vi_command)
          mode_icon = @config.vi_cmd_mode_icon
        elsif @config.editing_mode_is?(:vi_insert)
          mode_icon = @config.vi_ins_mode_icon
        elsif @config.editing_mode_is?(:emacs)
          mode_icon = @config.emacs_mode_string
        else
          mode_icon = '?'
        end
        prompt = mode_icon + prompt
      end
      [prompt, prompt_width, nil]
    end
  end

def reset(prompt = '', encoding:)
    @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y
    @screen_size = Reline::IOGate.get_screen_size
    reset_variables(prompt, encoding: encoding)
    @old_trap = Signal.trap('SIGINT') {
      @old_trap.call if @old_trap.respond_to?(:call) # can also be string, ex: "DEFAULT"
      raise Interrupt
    }
    Reline::IOGate.set_winch_handler do
      @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y
      old_screen_size = @screen_size
      @screen_size = Reline::IOGate.get_screen_size
      if old_screen_size.last < @screen_size.last # columns increase
        @rerender_all = true
        rerender
      else
        back = 0
        new_buffer = whole_lines
        prompt, prompt_width, prompt_list = check_multiline_prompt(new_buffer, prompt)
        new_buffer.each_with_index do |line, index|
          prompt_width = calculate_width(prompt_list[index], true) if @prompt_proc
          width = prompt_width + calculate_width(line)
          height = calculate_height_by_width(width)
          back += height
        end
        @highest_in_all = back
        @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
        @first_line_started_from =
          if @line_index.zero?
            0
          else
            calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list || prompt)
          end
        if @prompt_proc
          prompt = prompt_list[@line_index]
          prompt_width = calculate_width(prompt, true)
        end
        calculate_nearest_cursor
        @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
        Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
        @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
        @rerender_all = true
      end
    end
  end

def finalize
    Signal.trap('SIGINT', @old_trap)
  end

def eof?
    @eof
  end

def reset_variables(prompt = '', encoding:)
    @prompt = prompt
    @mark_pointer = nil
    @encoding = encoding
    @is_multiline = false
    @finished = false
    @cleared = false
    @rerender_all = false
    @history_pointer = nil
    @kill_ring = Reline::KillRing.new
    @vi_clipboard = ''
    @vi_arg = nil
    @waiting_proc = nil
    @waiting_operator_proc = nil
    @completion_journey_data = nil
    @completion_state = CompletionState::NORMAL
    @perfect_matched = nil
    @menu_info = nil
    @first_prompt = true
    @searching_prompt = nil
    @first_char = true
    @eof = false
    reset_line
  end

def reset_line
    @cursor = 0
    @cursor_max = 0
    @byte_pointer = 0
    @buffer_of_lines = [String.new(encoding: @encoding)]
    @line_index = 0
    @previous_line_index = nil
    @line = @buffer_of_lines[0]
    @first_line_started_from = 0
    @move_up = 0
    @started_from = 0
    @highest_in_this = 1
    @highest_in_all = 1
    @line_backup_in_history = nil
    @multibyte_buffer = String.new(encoding: 'ASCII-8BIT')
    @check_new_auto_indent = false
  end

def multiline_on
    @is_multiline = true
  end

def multiline_off
    @is_multiline = false
  end

private def calculate_height_by_lines(lines, prompt)
    result = 0
    prompt_list = prompt.is_a?(Array) ? prompt : nil
    lines.each_with_index { |line, i|
      prompt = prompt_list[i] if prompt_list and prompt_list[i]
      result += calculate_height_by_width(calculate_width(prompt, true) + calculate_width(line))
    }
    result
  end

private def insert_new_line(cursor_line, next_line)
    @line = cursor_line
    @buffer_of_lines.insert(@line_index + 1, String.new(next_line, encoding: @encoding))
    @previous_line_index = @line_index
    @line_index += 1
  end

private def calculate_height_by_width(width)
    width.div(@screen_size.last) + 1
  end

private def split_by_width(str, max_width)
    Reline::Unicode.split_by_width(str, max_width, @encoding)
  end

private def scroll_down(val)
    if val <= @rest_height
      Reline::IOGate.move_cursor_down(val)
      @rest_height -= val
    else
      Reline::IOGate.move_cursor_down(@rest_height)
      Reline::IOGate.scroll_down(val - @rest_height)
      @rest_height = 0
    end
  end

private def move_cursor_up(val)
    if val > 0
      Reline::IOGate.move_cursor_up(val)
      @rest_height += val
    elsif val < 0
      move_cursor_down(-val)
    end
  end

private def move_cursor_down(val)
    if val > 0
      Reline::IOGate.move_cursor_down(val)
      @rest_height -= val
      @rest_height = 0 if @rest_height < 0
    elsif val < 0
      move_cursor_up(-val)
    end
  end

private def calculate_nearest_cursor
    @cursor_max = calculate_width(line)
    new_cursor = 0
    new_byte_pointer = 0
    height = 1
    max_width = @screen_size.last
    if @config.editing_mode_is?(:vi_command)
      last_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @line.bytesize)
      if last_byte_size > 0
        last_mbchar = @line.byteslice(@line.bytesize - last_byte_size, last_byte_size)
        last_width = Reline::Unicode.get_mbchar_width(last_mbchar)
        cursor_max = @cursor_max - last_width
      else
        cursor_max = @cursor_max
      end
    else
      cursor_max = @cursor_max
    end
    @line.encode(Encoding::UTF_8).grapheme_clusters.each do |gc|
      mbchar_width = Reline::Unicode.get_mbchar_width(gc)
      now = new_cursor + mbchar_width
      if now > cursor_max or now > @cursor
        break
      end
      new_cursor += mbchar_width
      if new_cursor > max_width * height
        height += 1
      end
      new_byte_pointer += gc.bytesize
    end
    @started_from = height - 1
    @cursor = new_cursor
    @byte_pointer = new_byte_pointer
  end

def rerender
    return if @line.nil?
    if @menu_info
      scroll_down(@highest_in_all - @first_line_started_from)
      @rerender_all = true
      @menu_info.list.sort!.each do |item|
        Reline::IOGate.move_cursor_column(0)
        @output.write item
        @output.flush
        scroll_down(1)
      end
      scroll_down(@highest_in_all - 1)
      move_cursor_up(@highest_in_all - 1 - @first_line_started_from)
      @menu_info = nil
    end
    prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines, prompt)
    if @cleared
      Reline::IOGate.clear_screen
      @cleared = false
      back = 0
      modify_lines(whole_lines).each_with_index do |line, index|
        if @prompt_proc
          pr = prompt_list[index]
          height = render_partial(pr, calculate_width(pr), line, false)
        else
          height = render_partial(prompt, prompt_width, line, false)
        end
        if index < (@buffer_of_lines.size - 1)
          move_cursor_down(height)
          back += height
        end
      end
      move_cursor_up(back)
      move_cursor_down(@first_line_started_from + @started_from)
      Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
      return
    end
    new_highest_in_this = calculate_height_by_width(prompt_width + calculate_width(@line.nil? ? '' : @line))
    # FIXME: end of logical line sometimes breaks
    if @previous_line_index or new_highest_in_this != @highest_in_this
      if @previous_line_index
        new_lines = whole_lines(index: @previous_line_index, line: @line)
      else
        new_lines = whole_lines
      end
      prompt, prompt_width, prompt_list = check_multiline_prompt(new_lines, prompt)
      all_height = calculate_height_by_lines(new_lines, prompt_list || prompt)
      diff = all_height - @highest_in_all
      move_cursor_down(@highest_in_all - @first_line_started_from - @started_from - 1)
      if diff > 0
        scroll_down(diff)
        move_cursor_up(all_height - 1)
      elsif diff < 0
        (-diff).times do
          Reline::IOGate.move_cursor_column(0)
          Reline::IOGate.erase_after_cursor
          move_cursor_up(1)
        end
        move_cursor_up(all_height - 1)
      else
        move_cursor_up(all_height - 1)
      end
      @highest_in_all = all_height
      back = 0
      modify_lines(new_lines).each_with_index do |line, index|
        if @prompt_proc
          prompt = prompt_list[index]
          prompt_width = calculate_width(prompt, true)
        end
        height = render_partial(prompt, prompt_width, line, false)
        if index < (new_lines.size - 1)
          scroll_down(1)
          back += height
        else
          back += height - 1
        end
      end
      move_cursor_up(back)
      if @previous_line_index
        @buffer_of_lines[@previous_line_index] = @line
        @line = @buffer_of_lines[@line_index]
      end
      @first_line_started_from =
        if @line_index.zero?
          0
        else
          calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list || prompt)
        end
      if @prompt_proc
        prompt = prompt_list[@line_index]
        prompt_width = calculate_width(prompt, true)
      end
      move_cursor_down(@first_line_started_from)
      calculate_nearest_cursor
      @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
      move_cursor_down(@started_from)
      Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
      @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
      @previous_line_index = nil
      rendered = true
    elsif @rerender_all
      move_cursor_up(@first_line_started_from + @started_from)
      Reline::IOGate.move_cursor_column(0)
      back = 0
      new_buffer = whole_lines
      prompt, prompt_width, prompt_list = check_multiline_prompt(new_buffer, prompt)
      new_buffer.each_with_index do |line, index|
        prompt_width = calculate_width(prompt_list[index], true) if @prompt_proc
        width = prompt_width + calculate_width(line)
        height = calculate_height_by_width(width)
        back += height
      end
      if back > @highest_in_all
        scroll_down(back - 1)
        move_cursor_up(back - 1)
      elsif back < @highest_in_all
        scroll_down(back)
        Reline::IOGate.erase_after_cursor
        (@highest_in_all - back - 1).times do
          scroll_down(1)
          Reline::IOGate.erase_after_cursor
        end
        move_cursor_up(@highest_in_all - 1)
      end
      modify_lines(new_buffer).each_with_index do |line, index|
        if @prompt_proc
          prompt = prompt_list[index]
          prompt_width = calculate_width(prompt, true)
        end
        render_partial(prompt, prompt_width, line, false)
        if index < (new_buffer.size - 1)
          move_cursor_down(1)
        end
      end
      move_cursor_up(back - 1)
      if @prompt_proc
        prompt = prompt_list[@line_index]
        prompt_width = calculate_width(prompt, true)
      end
      @highest_in_all = back
      @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
      @first_line_started_from =
        if @line_index.zero?
          0
        else
          calculate_height_by_lines(new_buffer[0..(@line_index - 1)], prompt_list || prompt)
        end
      @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
      move_cursor_down(@first_line_started_from + @started_from)
      Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
      @rerender_all = false
      rendered = true
    end
    line = modify_lines(whole_lines)[@line_index]
    if @is_multiline
      prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines, prompt)
      if finished?
        # Always rerender on finish because output_modifier_proc may return a different output.
        render_partial(prompt, prompt_width, line)
        scroll_down(1)
        Reline::IOGate.move_cursor_column(0)
        Reline::IOGate.erase_after_cursor
      elsif not rendered
        render_partial(prompt, prompt_width, line)
      end
    else
      render_partial(prompt, prompt_width, line)
      if finished?
        scroll_down(1)
        Reline::IOGate.move_cursor_column(0)
        Reline::IOGate.erase_after_cursor
      end
    end
  end

private def render_partial(prompt, prompt_width, line_to_render, with_control = true)
    visual_lines, height = split_by_width(line_to_render.nil? ? prompt : prompt + line_to_render, @screen_size.last)
    if with_control
      if height > @highest_in_this
        diff = height - @highest_in_this
        scroll_down(diff)
        @highest_in_all += diff
        @highest_in_this = height
        move_cursor_up(diff)
      elsif height < @highest_in_this
        diff = @highest_in_this - height
        @highest_in_all -= diff
        @highest_in_this = height
      end
      move_cursor_up(@started_from)
      @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
    end
    Reline::IOGate.move_cursor_column(0)
    visual_lines.each_with_index do |line, index|
      if line.nil?
        if calculate_width(visual_lines[index - 1], true) == Reline::IOGate.get_screen_size.last
          # reaches the end of line
          if Reline::IOGate.win?
            # A newline is automatically inserted if a character is rendered at
            # eol on command prompt.
          else
            # When the cursor is at the end of the line and erases characters
            # after the cursor, some terminals delete the character at the
            # cursor position.
            move_cursor_down(1)
            Reline::IOGate.move_cursor_column(0)
          end
        else
          Reline::IOGate.erase_after_cursor
          move_cursor_down(1)
          Reline::IOGate.move_cursor_column(0)
        end
        next
      end
      @output.write line
      if Reline::IOGate.win? and calculate_width(line, true) == Reline::IOGate.get_screen_size.last
        # A newline is automatically inserted if a character is rendered at eol on command prompt.
        @rest_height -= 1 if @rest_height > 0
      end
      @output.flush
      if @first_prompt
        @first_prompt = false
        @pre_input_hook&.call
      end
    end
    Reline::IOGate.erase_after_cursor
    if with_control
      # Just after rendring, so the cursor is on the last line.
      if finished?
        Reline::IOGate.move_cursor_column(0)
      else
        # Moves up from bottom of lines to the cursor position.
        move_cursor_up(height - 1 - @started_from)
        Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
      end
    end
    height
  end

private def modify_lines(before)
    return before if before.nil? || before.empty?

if after = @output_modifier_proc&.call("#{before.join("\n")}\n", complete: finished?)
      after.lines("\n").map { |l| l.chomp('') }
    else
      before
    end
  end

def editing_mode
    @config.editing_mode
  end

private def menu(target, list)
    @menu_info = MenuInfo.new(target, list)
  end

private def complete_internal_proc(list, is_menu)
    preposing, target, postposing = retrieve_completion_block
    list = list.select { |i|
      if i and not Encoding.compatible?(target.encoding, i.encoding)
        raise Encoding::CompatibilityError, "#{target.encoding.name} is not compatible with #{i.encoding.name}"
      end
      if @config.completion_ignore_case
        i&.downcase&.start_with?(target.downcase)
      else
        i&.start_with?(target)
      end
    }
    if is_menu
      menu(target, list)
      return nil
    end
    completed = list.inject { |memo, item|
      begin
        memo_mbchars = memo.unicode_normalize.grapheme_clusters
        item_mbchars = item.unicode_normalize.grapheme_clusters
      rescue Encoding::CompatibilityError
        memo_mbchars = memo.grapheme_clusters
        item_mbchars = item.grapheme_clusters
      end
      size = [memo_mbchars.size, item_mbchars.size].min
      result = ''
      size.times do |i|
        if @config.completion_ignore_case
          if memo_mbchars[i].casecmp?(item_mbchars[i])
            result << memo_mbchars[i]
          else
            break
          end
        else
          if memo_mbchars[i] == item_mbchars[i]
            result << memo_mbchars[i]
          else
            break
          end
        end
      end
      result
    }
    [target, preposing, completed, postposing]
  end

private def complete(list, just_show_list = false)
    case @completion_state
    when CompletionState::NORMAL, CompletionState::JOURNEY
      @completion_state = CompletionState::COMPLETION
    when CompletionState::PERFECT_MATCH
      @dig_perfect_match_proc&.(@perfect_matched)
    end
    if just_show_list
      is_menu = true
    elsif @completion_state == CompletionState::MENU
      is_menu = true
    elsif @completion_state == CompletionState::MENU_WITH_PERFECT_MATCH
      is_menu = true
    else
      is_menu = false
    end
    result = complete_internal_proc(list, is_menu)
    if @completion_state == CompletionState::MENU_WITH_PERFECT_MATCH
      @completion_state = CompletionState::PERFECT_MATCH
    end
    return if result.nil?
    target, preposing, completed, postposing = result
    return if completed.nil?
    if target <= completed and (@completion_state == CompletionState::COMPLETION)
      if list.include?(completed)
        if list.one?
          @completion_state = CompletionState::PERFECT_MATCH
        else
          @completion_state = CompletionState::MENU_WITH_PERFECT_MATCH
        end
        @perfect_matched = completed
      else
        @completion_state = CompletionState::MENU
      end
      if not just_show_list and target < completed
        @line = preposing + completed + completion_append_character.to_s + postposing
        line_to_pointer = preposing + completed + completion_append_character.to_s
        @cursor_max = calculate_width(@line)
        @cursor = calculate_width(line_to_pointer)
        @byte_pointer = line_to_pointer.bytesize
      end
    end
  end

private def move_completed_list(list, direction)
    case @completion_state
    when CompletionState::NORMAL, CompletionState::COMPLETION,
         CompletionState::MENU, CompletionState::MENU_WITH_PERFECT_MATCH
      @completion_state = CompletionState::JOURNEY
      result = retrieve_completion_block
      return if result.nil?
      preposing, target, postposing = result
      @completion_journey_data = CompletionJourneyData.new(
        preposing, postposing,
        [target] + list.select{ |item| item.start_with?(target) }, 0)
      @completion_state = CompletionState::JOURNEY
    else
      case direction
      when :up
        @completion_journey_data.pointer -= 1
        if @completion_journey_data.pointer < 0
          @completion_journey_data.pointer = @completion_journey_data.list.size - 1
        end
      when :down
        @completion_journey_data.pointer += 1
        if @completion_journey_data.pointer >= @completion_journey_data.list.size
          @completion_journey_data.pointer = 0
        end
      end
      completed = @completion_journey_data.list[@completion_journey_data.pointer]
      @line = @completion_journey_data.preposing + completed + @completion_journey_data.postposing
      line_to_pointer = @completion_journey_data.preposing + completed
      @cursor_max = calculate_width(@line)
      @cursor = calculate_width(line_to_pointer)
      @byte_pointer = line_to_pointer.bytesize
    end
  end

private def run_for_operators(key, method_symbol, &block)
    if @waiting_operator_proc
      if VI_MOTIONS.include?(method_symbol)
        old_cursor, old_byte_pointer = @cursor, @byte_pointer
        block.()
        unless @waiting_proc
          cursor_diff, byte_pointer_diff = @cursor - old_cursor, @byte_pointer - old_byte_pointer
          @cursor, @byte_pointer = old_cursor, old_byte_pointer
          @waiting_operator_proc.(cursor_diff, byte_pointer_diff)
        else
          old_waiting_proc = @waiting_proc
          old_waiting_operator_proc = @waiting_operator_proc
          @waiting_proc = proc { |k|
            old_cursor, old_byte_pointer = @cursor, @byte_pointer
            old_waiting_proc.(k)
            cursor_diff, byte_pointer_diff = @cursor - old_cursor, @byte_pointer - old_byte_pointer
            @cursor, @byte_pointer = old_cursor, old_byte_pointer
            @waiting_operator_proc.(cursor_diff, byte_pointer_diff)
            @waiting_operator_proc = old_waiting_operator_proc
          }
        end
      else
        # Ignores operator when not motion is given.
        block.()
      end
      @waiting_operator_proc = nil
    else
      block.()
    end
  end

private def argumentable?(method_obj)
    method_obj and method_obj.parameters.length != 1
  end

private def process_key(key, method_symbol)
    if method_symbol and respond_to?(method_symbol, true)
      method_obj = method(method_symbol)
    else
      method_obj = nil
    end
    if method_symbol and key.is_a?(Symbol)
      if @vi_arg and argumentable?(method_obj)
        run_for_operators(key, method_symbol) do
          method_obj.(key, arg: @vi_arg)
        end
      else
        method_obj&.(key)
      end
      @kill_ring.process
      @vi_arg = nil
    elsif @vi_arg
      if key.chr =~ /[0-9]/
        ed_argument_digit(key)
      else
        if argumentable?(method_obj)
          run_for_operators(key, method_symbol) do
            method_obj.(key, arg: @vi_arg)
          end
        elsif @waiting_proc
          @waiting_proc.(key)
        elsif method_obj
          method_obj.(key)
        else
          ed_insert(key)
        end
        @kill_ring.process
        @vi_arg = nil
      end
    elsif @waiting_proc
      @waiting_proc.(key)
      @kill_ring.process
    elsif method_obj
      if method_symbol == :ed_argument_digit
        method_obj.(key)
      else
        run_for_operators(key, method_symbol) do
          method_obj.(key)
        end
      end
      @kill_ring.process
    else
      ed_insert(key)
    end
  end

private def normal_char(key)
    method_symbol = method_obj = nil
    if key.combined_char.is_a?(Symbol)
      process_key(key.combined_char, key.combined_char)
      return
    end
    @multibyte_buffer << key.combined_char
    if @multibyte_buffer.size > 1
      if @multibyte_buffer.dup.force_encoding(@encoding).valid_encoding?
        process_key(@multibyte_buffer.dup.force_encoding(@encoding), nil)
        @multibyte_buffer.clear
      else
        # invalid
        return
      end
    else # single byte
      return if key.char >= 128 # maybe, first byte of multi byte
      method_symbol = @config.editing_mode.get_method(key.combined_char)
      if key.with_meta and method_symbol == :ed_unassigned
        # split ESC + key
        method_symbol = @config.editing_mode.get_method("\e".ord)
        process_key("\e".ord, method_symbol)
        method_symbol = @config.editing_mode.get_method(key.char)
        process_key(key.char, method_symbol)
      else
        process_key(key.combined_char, method_symbol)
      end
      @multibyte_buffer.clear
    end
    if @config.editing_mode_is?(:vi_command) and @cursor > 0 and @cursor == @cursor_max
      byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
      @byte_pointer -= byte_size
      mbchar = @line.byteslice(@byte_pointer, byte_size)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor -= width
    end
  end

def input_key(key)
    if key.char.nil?
      if @first_char
        @line = nil
      end
      finish
      return
    end
    @first_char = false
    completion_occurs = false
    if @config.editing_mode_is?(:emacs, :vi_insert) and key.char == "\C-i".ord
      unless @config.disable_completion
        result = call_completion_proc
        if result.is_a?(Array)
          completion_occurs = true
          complete(result)
        end
      end
    elsif not @config.disable_completion and @config.editing_mode_is?(:vi_insert) and ["\C-p".ord, "\C-n".ord].include?(key.char)
      unless @config.disable_completion
        result = call_completion_proc
        if result.is_a?(Array)
          completion_occurs = true
          move_completed_list(result, "\C-p".ord == key.char ? :up : :down)
        end
      end
    elsif Symbol === key.char and respond_to?(key.char, true)
      process_key(key.char, key.char)
    else
      normal_char(key)
    end
    unless completion_occurs
      @completion_state = CompletionState::NORMAL
    end
    if @is_multiline and @auto_indent_proc
      process_auto_indent
    end
  end

def call_completion_proc
    result = retrieve_completion_block(true)
    slice = result[1]
    result = @completion_proc.(slice) if @completion_proc and slice
    Reline.core.instance_variable_set(:@completion_quote_character, nil)
    result
  end

private def process_auto_indent
    return if not @check_new_auto_indent and @previous_line_index # move cursor up or down
    if @check_new_auto_indent and @previous_line_index and @previous_line_index > 0 and @line_index > @previous_line_index
      # Fix indent of a line when a newline is inserted to the next
      new_lines = whole_lines(index: @previous_line_index, line: @line)
      new_indent = @auto_indent_proc.(new_lines[0..-3].push(''), @line_index - 1, 0, true)
      md = @line.match(/\A */)
      prev_indent = md[0].count(' ')
      @line = ' ' * new_indent + @line.lstrip

new_indent = nil
      result = @auto_indent_proc.(new_lines[0..-2], @line_index - 1, (new_lines[-2].size + 1), false)
      if result
        new_indent = result
      end
      if new_indent&.>= 0
        @line = ' ' * new_indent + @line.lstrip
      end
    end
    if @previous_line_index
      new_lines = whole_lines(index: @previous_line_index, line: @line)
    else
      new_lines = whole_lines
    end
    new_indent = @auto_indent_proc.(new_lines, @line_index, @byte_pointer, @check_new_auto_indent)
    if new_indent&.>= 0
      md = new_lines[@line_index].match(/\A */)
      prev_indent = md[0].count(' ')
      if @check_new_auto_indent
        @buffer_of_lines[@line_index] = ' ' * new_indent + @buffer_of_lines[@line_index].lstrip
        @cursor = new_indent
        @byte_pointer = new_indent
      else
        @line = ' ' * new_indent + @line.lstrip
        @cursor += new_indent - prev_indent
        @byte_pointer += new_indent - prev_indent
      end
    end
    @check_new_auto_indent = false
  end

def retrieve_completion_block(set_completion_quote_character = false)
    word_break_regexp = /\A[#{Regexp.escape(Reline.completer_word_break_characters)}]/
    quote_characters_regexp = /\A[#{Regexp.escape(Reline.completer_quote_characters)}]/
    before = @line.byteslice(0, @byte_pointer)
    rest = nil
    break_pointer = nil
    quote = nil
    closing_quote = nil
    escaped_quote = nil
    i = 0
    while i < @byte_pointer do
      slice = @line.byteslice(i, @byte_pointer - i)
      unless slice.valid_encoding?
        i += 1
        next
      end
      if quote and slice.start_with?(closing_quote)
        quote = nil
        i += 1
        rest = nil
      elsif quote and slice.start_with?(escaped_quote)
        # skip
        i += 2
      elsif slice =~ quote_characters_regexp # find new "
        rest = $'
        quote = $&
        closing_quote = /(?!\\)#{Regexp.escape(quote)}/
        escaped_quote = /\\#{Regexp.escape(quote)}/
        i += 1
        break_pointer = i - 1
      elsif not quote and slice =~ word_break_regexp
        rest = $'
        i += 1
        before = @line.byteslice(i, @byte_pointer - i)
        break_pointer = i
      else
        i += 1
      end
    end
    postposing = @line.byteslice(@byte_pointer, @line.bytesize - @byte_pointer)
    if rest
      preposing = @line.byteslice(0, break_pointer)
      target = rest
      if set_completion_quote_character and quote
        Reline.core.instance_variable_set(:@completion_quote_character, quote)
        if postposing !~ /(?!\\)#{Regexp.escape(quote)}/ # closing quote
          insert_text(quote)
        end
      end
    else
      preposing = ''
      if break_pointer
        preposing = @line.byteslice(0, break_pointer)
      else
        preposing = ''
      end
      target = before
    end
    [preposing.encode(@encoding), target.encode(@encoding), postposing.encode(@encoding)]
  end

def confirm_multiline_termination
    temp_buffer = @buffer_of_lines.dup
    if @previous_line_index and @line_index == (@buffer_of_lines.size - 1)
      temp_buffer[@previous_line_index] = @line
    else
      temp_buffer[@line_index] = @line
    end
    @confirm_multiline_termination_proc.(temp_buffer.join("\n") + "\n")
  end

def insert_text(text)
    width = calculate_width(text)
    if @cursor == @cursor_max
      @line += text
    else
      @line = byteinsert(@line, @byte_pointer, text)
    end
    @byte_pointer += text.bytesize
    @cursor += width
    @cursor_max += width
  end

def delete_text(start = nil, length = nil)
    if start.nil? and length.nil?
      @line&.clear
      @byte_pointer = 0
      @cursor = 0
      @cursor_max = 0
    elsif not start.nil? and not length.nil?
      if @line
        before = @line.byteslice(0, start)
        after = @line.byteslice(start + length, @line.bytesize)
        @line = before + after
        @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize
        str = @line.byteslice(0, @byte_pointer)
        @cursor = calculate_width(str)
        @cursor_max = calculate_width(@line)
      end
    elsif start.is_a?(Range)
      range = start
      first = range.first
      last = range.last
      last = @line.bytesize - 1 if last > @line.bytesize
      last += @line.bytesize if last < 0
      first += @line.bytesize if first < 0
      range = range.exclude_end? ? first...last : first..last
      @line = @line.bytes.reject.with_index{ |c, i| range.include?(i) }.map{ |c| c.chr(Encoding::ASCII_8BIT) }.join.force_encoding(@encoding)
      @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize
      str = @line.byteslice(0, @byte_pointer)
      @cursor = calculate_width(str)
      @cursor_max = calculate_width(@line)
    else
      @line = @line.byteslice(0, start)
      @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize
      str = @line.byteslice(0, @byte_pointer)
      @cursor = calculate_width(str)
      @cursor_max = calculate_width(@line)
    end
  end

def byte_pointer=(val)
    @byte_pointer = val
    str = @line.byteslice(0, @byte_pointer)
    @cursor = calculate_width(str)
    @cursor_max = calculate_width(@line)
  end

def whole_lines(index: @line_index, line: @line)
    temp_lines = @buffer_of_lines.dup
    temp_lines[index] = line
    temp_lines
  end

def whole_buffer
    if @buffer_of_lines.size == 1 and @line.nil?
      nil
    else
      whole_lines.join("\n")
    end
  end

def finished?
    @finished
  end

def finish
    @finished = true
    @config.reset
  end

private def byteslice!(str, byte_pointer, size)
    new_str = str.byteslice(0, byte_pointer)
    new_str << str.byteslice(byte_pointer + size, str.bytesize)
    [new_str, str.byteslice(byte_pointer, size)]
  end

private def byteinsert(str, byte_pointer, other)
    new_str = str.byteslice(0, byte_pointer)
    new_str << other
    new_str << str.byteslice(byte_pointer, str.bytesize)
    new_str
  end

private def calculate_width(str, allow_escape_code = false)
    Reline::Unicode.calculate_width(str, allow_escape_code)
  end

private def key_delete(key)
    if @config.editing_mode_is?(:vi_insert, :emacs)
      ed_delete_next_char(key)
    end
  end

private def key_newline(key)
    if @is_multiline
      next_line = @line.byteslice(@byte_pointer, @line.bytesize - @byte_pointer)
      cursor_line = @line.byteslice(0, @byte_pointer)
      insert_new_line(cursor_line, next_line)
      @cursor = 0
      @check_new_auto_indent = true
    end
  end

private def ed_unassigned(key) end # do nothing

private def ed_insert(key)
    if key.instance_of?(String)
      begin
        key.encode(Encoding::UTF_8)
      rescue Encoding::UndefinedConversionError
        return
      end
      width = Reline::Unicode.get_mbchar_width(key)
      if @cursor == @cursor_max
        @line += key
      else
        @line = byteinsert(@line, @byte_pointer, key)
      end
      @byte_pointer += key.bytesize
      @cursor += width
      @cursor_max += width
    else
      begin
        key.chr.encode(Encoding::UTF_8)
      rescue Encoding::UndefinedConversionError
        return
      end
      if @cursor == @cursor_max
        @line += key.chr
      else
        @line = byteinsert(@line, @byte_pointer, key.chr)
      end
      width = Reline::Unicode.get_mbchar_width(key.chr)
      @byte_pointer += 1
      @cursor += width
      @cursor_max += width
    end
  end
  alias_method :ed_digit, :ed_insert
  alias_method :self_insert, :ed_insert

private def ed_quoted_insert(str, arg: 1)
    @waiting_proc = proc { |key|
      arg.times do
        if key == "\C-j".ord or key == "\C-m".ord
          key_newline(key)
        else
          ed_insert(key)
        end
      end
      @waiting_proc = nil
    }
  end
  alias_method :quoted_insert, :ed_quoted_insert

private def ed_next_char(key, arg: 1)
    byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
    if (@byte_pointer < @line.bytesize)
      mbchar = @line.byteslice(@byte_pointer, byte_size)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor += width if width
      @byte_pointer += byte_size
    elsif @is_multiline and @config.editing_mode_is?(:emacs) and @byte_pointer == @line.bytesize and @line_index < @buffer_of_lines.size - 1
      next_line = @buffer_of_lines[@line_index + 1]
      @cursor = 0
      @byte_pointer = 0
      @cursor_max = calculate_width(next_line)
      @previous_line_index = @line_index
      @line_index += 1
    end
    arg -= 1
    ed_next_char(key, arg: arg) if arg > 0
  end
  alias_method :forward_char, :ed_next_char

private def ed_prev_char(key, arg: 1)
    if @cursor > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
      @byte_pointer -= byte_size
      mbchar = @line.byteslice(@byte_pointer, byte_size)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor -= width
    elsif @is_multiline and @config.editing_mode_is?(:emacs) and @byte_pointer == 0 and @line_index > 0
      prev_line = @buffer_of_lines[@line_index - 1]
      @cursor = calculate_width(prev_line)
      @byte_pointer = prev_line.bytesize
      @cursor_max = calculate_width(prev_line)
      @previous_line_index = @line_index
      @line_index -= 1
    end
    arg -= 1
    ed_prev_char(key, arg: arg) if arg > 0
  end

private def vi_first_print(key)
    @byte_pointer, @cursor = Reline::Unicode.vi_first_print(@line)
  end

private def ed_move_to_beg(key)
    @byte_pointer = @cursor = 0
  end
  alias_method :beginning_of_line, :ed_move_to_beg

private def ed_move_to_end(key)
    @byte_pointer = 0
    @cursor = 0
    byte_size = 0
    while @byte_pointer < @line.bytesize
      byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
      if byte_size > 0
        mbchar = @line.byteslice(@byte_pointer, byte_size)
        @cursor += Reline::Unicode.get_mbchar_width(mbchar)
      end
      @byte_pointer += byte_size
    end
  end
  alias_method :end_of_line, :ed_move_to_end

private def generate_searcher
    Fiber.new do |first_key|
      prev_search_key = first_key
      search_word = String.new(encoding: @encoding)
      multibyte_buf = String.new(encoding: 'ASCII-8BIT')
      last_hit = nil
      case first_key
      when "\C-r".ord
        prompt_name = 'reverse-i-search'
      when "\C-s".ord
        prompt_name = 'i-search'
      end
      loop do
        key = Fiber.yield(search_word)
        search_again = false
        case key
        when -1 # determined
          Reline.last_incremental_search = search_word
          break
        when "\C-h".ord, "\C-?".ord
          grapheme_clusters = search_word.grapheme_clusters
          if grapheme_clusters.size > 0
            grapheme_clusters.pop
            search_word = grapheme_clusters.join
          end
        when "\C-r".ord, "\C-s".ord
          search_again = true if prev_search_key == key
          prev_search_key = key
        else
          multibyte_buf << key
          if multibyte_buf.dup.force_encoding(@encoding).valid_encoding?
            search_word << multibyte_buf.dup.force_encoding(@encoding)
            multibyte_buf.clear
          end
        end
        hit = nil
        if not search_word.empty? and @line_backup_in_history&.include?(search_word)
          @history_pointer = nil
          hit = @line_backup_in_history
        else
          if search_again
            if search_word.empty? and Reline.last_incremental_search
              search_word = Reline.last_incremental_search
            end
            if @history_pointer
              case prev_search_key
              when "\C-r".ord
                history_pointer_base = 0
                history = Reline::HISTORY[0..(@history_pointer - 1)]
              when "\C-s".ord
                history_pointer_base = @history_pointer + 1
                history = Reline::HISTORY[(@history_pointer + 1)..-1]
              end
            else
              history_pointer_base = 0
              history = Reline::HISTORY
            end
          elsif @history_pointer
            case prev_search_key
            when "\C-r".ord
              history_pointer_base = 0
              history = Reline::HISTORY[0..@history_pointer]
            when "\C-s".ord
              history_pointer_base = @history_pointer
              history = Reline::HISTORY[@history_pointer..-1]
            end
          else
            history_pointer_base = 0
            history = Reline::HISTORY
          end
          case prev_search_key
          when "\C-r".ord
            hit_index = history.rindex { |item|
              item.include?(search_word)
            }
          when "\C-s".ord
            hit_index = history.index { |item|
              item.include?(search_word)
            }
          end
          if hit_index
            @history_pointer = history_pointer_base + hit_index
            hit = Reline::HISTORY[@history_pointer]
          end
        end
        case prev_search_key
        when "\C-r".ord
          prompt_name = 'reverse-i-search'
        when "\C-s".ord
          prompt_name = 'i-search'
        end
        if hit
          if @is_multiline
            @buffer_of_lines = hit.split("\n")
            @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
            @line_index = @buffer_of_lines.size - 1
            @line = @buffer_of_lines.last
            @rerender_all = true
            @searching_prompt = "(%s)`%s'" % [prompt_name, search_word]
          else
            @line = hit
            @searching_prompt = "(%s)`%s': %s" % [prompt_name, search_word, hit]
          end
          last_hit = hit
        else
          if @is_multiline
            @rerender_all = true
            @searching_prompt = "(failed %s)`%s'" % [prompt_name, search_word]
          else
            @searching_prompt = "(failed %s)`%s': %s" % [prompt_name, search_word, last_hit]
          end
        end
      end
    end
  end

private def incremental_search_history(key)
    unless @history_pointer
      if @is_multiline
        @line_backup_in_history = whole_buffer
      else
        @line_backup_in_history = @line
      end
    end
    searcher = generate_searcher
    searcher.resume(key)
    @searching_prompt = "(reverse-i-search)`': "
    @waiting_proc = ->(k) {
      case k
      when "\C-j".ord
        if @history_pointer
          buffer = Reline::HISTORY[@history_pointer]
        else
          buffer = @line_backup_in_history
        end
        if @is_multiline
          @buffer_of_lines = buffer.split("\n")
          @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
          @line_index = @buffer_of_lines.size - 1
          @line = @buffer_of_lines.last
          @rerender_all = true
        else
          @line = buffer
        end
        @searching_prompt = nil
        @waiting_proc = nil
        @cursor_max = calculate_width(@line)
        @cursor = @byte_pointer = 0
        searcher.resume(-1)
      when "\C-g".ord
        if @is_multiline
          @buffer_of_lines = @line_backup_in_history.split("\n")
          @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
          @line_index = @buffer_of_lines.size - 1
          @line = @buffer_of_lines.last
          @rerender_all = true
        else
          @line = @line_backup_in_history
        end
        @history_pointer = nil
        @searching_prompt = nil
        @waiting_proc = nil
        @line_backup_in_history = nil
        @cursor_max = calculate_width(@line)
        @cursor = @byte_pointer = 0
        @rerender_all = true
      else
        chr = k.is_a?(String) ? k : k.chr(Encoding::ASCII_8BIT)
        if chr.match?(/[[:print:]]/) or k == "\C-h".ord or k == "\C-?".ord or k == "\C-r".ord or k == "\C-s".ord
          searcher.resume(k)
        else
          if @history_pointer
            line = Reline::HISTORY[@history_pointer]
          else
            line = @line_backup_in_history
          end
          if @is_multiline
            @line_backup_in_history = whole_buffer
            @buffer_of_lines = line.split("\n")
            @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
            @line_index = @buffer_of_lines.size - 1
            @line = @buffer_of_lines.last
            @rerender_all = true
          else
            @line_backup_in_history = @line
            @line = line
          end
          @searching_prompt = nil
          @waiting_proc = nil
          @cursor_max = calculate_width(@line)
          @cursor = @byte_pointer = 0
          searcher.resume(-1)
        end
      end
    }
  end

private def vi_search_prev(key)
    incremental_search_history(key)
  end
  alias_method :reverse_search_history, :vi_search_prev

private def vi_search_next(key)
    incremental_search_history(key)
  end
  alias_method :forward_search_history, :vi_search_next

private def ed_search_prev_history(key, arg: 1)
    history = nil
    h_pointer = nil
    line_no = nil
    substr = @line.slice(0, @byte_pointer)
    if @history_pointer.nil?
      return if not @line.empty? and substr.empty?
      history = Reline::HISTORY
    elsif @history_pointer.zero?
      history = nil
      h_pointer = nil
    else
      history = Reline::HISTORY.slice(0, @history_pointer)
    end
    return if history.nil?
    if @is_multiline
      h_pointer = history.rindex { |h|
        h.split("\n").each_with_index { |l, i|
          if l.start_with?(substr)
            line_no = i
            break
          end
        }
        not line_no.nil?
      }
    else
      h_pointer = history.rindex { |l|
        l.start_with?(substr)
      }
    end
    return if h_pointer.nil?
    @history_pointer = h_pointer
    if @is_multiline
      @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
      @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
      @line_index = line_no
      @line = @buffer_of_lines.last
      @rerender_all = true
    else
      @line = Reline::HISTORY[@history_pointer]
    end
    @cursor_max = calculate_width(@line)
    arg -= 1
    ed_search_prev_history(key, arg: arg) if arg > 0
  end
  alias_method :history_search_backward, :ed_search_prev_history

private def ed_search_next_history(key, arg: 1)
    substr = @line.slice(0, @byte_pointer)
    if @history_pointer.nil?
      return
    elsif @history_pointer == (Reline::HISTORY.size - 1) and not substr.empty?
      return
    end
    history = Reline::HISTORY.slice((@history_pointer + 1)..-1)
    h_pointer = nil
    line_no = nil
    if @is_multiline
      h_pointer = history.index { |h|
        h.split("\n").each_with_index { |l, i|
          if l.start_with?(substr)
            line_no = i
            break
          end
        }
        not line_no.nil?
      }
    else
      h_pointer = history.index { |l|
        l.start_with?(substr)
      }
    end
    h_pointer += @history_pointer + 1 if h_pointer and @history_pointer
    return if h_pointer.nil? and not substr.empty?
    @history_pointer = h_pointer
    if @is_multiline
      if @history_pointer.nil? and substr.empty?
        @buffer_of_lines = []
        @line_index = 0
      else
        @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
        @line_index = line_no
      end
      @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
      @line = @buffer_of_lines.last
      @rerender_all = true
    else
      if @history_pointer.nil? and substr.empty?
        @line = ''
      else
        @line = Reline::HISTORY[@history_pointer]
      end
    end
    @cursor_max = calculate_width(@line)
    arg -= 1
    ed_search_next_history(key, arg: arg) if arg > 0
  end
  alias_method :history_search_forward, :ed_search_next_history

private def ed_prev_history(key, arg: 1)
    if @is_multiline and @line_index > 0
      @previous_line_index = @line_index
      @line_index -= 1
      return
    end
    if Reline::HISTORY.empty?
      return
    end
    if @history_pointer.nil?
      @history_pointer = Reline::HISTORY.size - 1
      if @is_multiline
        @line_backup_in_history = whole_buffer
        @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
        @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
        @line_index = @buffer_of_lines.size - 1
        @line = @buffer_of_lines.last
        @rerender_all = true
      else
        @line_backup_in_history = @line
        @line = Reline::HISTORY[@history_pointer]
      end
    elsif @history_pointer.zero?
      return
    else
      if @is_multiline
        Reline::HISTORY[@history_pointer] = whole_buffer
        @history_pointer -= 1
        @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
        @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
        @line_index = @buffer_of_lines.size - 1
        @line = @buffer_of_lines.last
        @rerender_all = true
      else
        Reline::HISTORY[@history_pointer] = @line
        @history_pointer -= 1
        @line = Reline::HISTORY[@history_pointer]
      end
    end
    if @config.editing_mode_is?(:emacs, :vi_insert)
      @cursor_max = @cursor = calculate_width(@line)
      @byte_pointer = @line.bytesize
    elsif @config.editing_mode_is?(:vi_command)
      @byte_pointer = @cursor = 0
      @cursor_max = calculate_width(@line)
    end
    arg -= 1
    ed_prev_history(key, arg: arg) if arg > 0
  end

private def ed_next_history(key, arg: 1)
    if @is_multiline and @line_index < (@buffer_of_lines.size - 1)
      @previous_line_index = @line_index
      @line_index += 1
      return
    end
    if @history_pointer.nil?
      return
    elsif @history_pointer == (Reline::HISTORY.size - 1)
      if @is_multiline
        @history_pointer = nil
        @buffer_of_lines = @line_backup_in_history.split("\n")
        @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
        @line_index = 0
        @line = @buffer_of_lines.first
        @rerender_all = true
      else
        @history_pointer = nil
        @line = @line_backup_in_history
      end
    else
      if @is_multiline
        Reline::HISTORY[@history_pointer] = whole_buffer
        @history_pointer += 1
        @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
        @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
        @line_index = 0
        @line = @buffer_of_lines.first
        @rerender_all = true
      else
        Reline::HISTORY[@history_pointer] = @line
        @history_pointer += 1
        @line = Reline::HISTORY[@history_pointer]
      end
    end
    @line = '' unless @line
    if @config.editing_mode_is?(:emacs, :vi_insert)
      @cursor_max = @cursor = calculate_width(@line)
      @byte_pointer = @line.bytesize
    elsif @config.editing_mode_is?(:vi_command)
      @byte_pointer = @cursor = 0
      @cursor_max = calculate_width(@line)
    end
    arg -= 1
    ed_next_history(key, arg: arg) if arg > 0
  end

private def ed_newline(key)
    if @is_multiline
      if @config.editing_mode_is?(:vi_command)
        if @line_index < (@buffer_of_lines.size - 1)
          ed_next_history(key) # means cursor down
        else
          # should check confirm_multiline_termination to finish?
          finish
        end
      else
        if @line_index == (@buffer_of_lines.size - 1)
          if confirm_multiline_termination
            finish
          else
            key_newline(key)
          end
        else
          # should check confirm_multiline_termination to finish?
          @previous_line_index = @line_index
          @line_index = @buffer_of_lines.size - 1
          finish
        end
      end
    else
      if @history_pointer
        Reline::HISTORY[@history_pointer] = @line
        @history_pointer = nil
      end
      finish
    end
  end

private def em_delete_prev_char(key)
    if @is_multiline and @cursor == 0 and @line_index > 0
      @buffer_of_lines[@line_index] = @line
      @cursor = calculate_width(@buffer_of_lines[@line_index - 1])
      @byte_pointer = @buffer_of_lines[@line_index - 1].bytesize
      @buffer_of_lines[@line_index - 1] += @buffer_of_lines.delete_at(@line_index)
      @line_index -= 1
      @line = @buffer_of_lines[@line_index]
      @cursor_max = calculate_width(@line)
      @rerender_all = true
    elsif @cursor > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
      @byte_pointer -= byte_size
      @line, mbchar = byteslice!(@line, @byte_pointer, byte_size)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor -= width
      @cursor_max -= width
    end
  end
  alias_method :backward_delete_char, :em_delete_prev_char

private def ed_kill_line(key)
    if @line.bytesize > @byte_pointer
      @line, deleted = byteslice!(@line, @byte_pointer, @line.bytesize - @byte_pointer)
      @byte_pointer = @line.bytesize
      @cursor = @cursor_max = calculate_width(@line)
      @kill_ring.append(deleted)
    elsif @is_multiline and @byte_pointer == @line.bytesize and @buffer_of_lines.size > @line_index + 1
      @cursor = calculate_width(@line)
      @byte_pointer = @line.bytesize
      @line += @buffer_of_lines.delete_at(@line_index + 1)
      @cursor_max = calculate_width(@line)
      @buffer_of_lines[@line_index] = @line
      @rerender_all = true
      @rest_height += 1
    end
  end

private def em_kill_line(key)
    if @byte_pointer > 0
      @line, deleted = byteslice!(@line, 0, @byte_pointer)
      @byte_pointer = 0
      @kill_ring.append(deleted, true)
      @cursor_max = calculate_width(@line)
      @cursor = 0
    end
  end

private def em_delete(key)
    if (not @is_multiline and @line.empty?) or (@is_multiline and @line.empty? and @buffer_of_lines.size == 1)
      @line = nil
      if @buffer_of_lines.size > 1
        scroll_down(@highest_in_all - @first_line_started_from)
      end
      Reline::IOGate.move_cursor_column(0)
      @eof = true
      finish
    elsif @byte_pointer < @line.bytesize
      splitted_last = @line.byteslice(@byte_pointer, @line.bytesize)
      mbchar = splitted_last.grapheme_clusters.first
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor_max -= width
      @line, = byteslice!(@line, @byte_pointer, mbchar.bytesize)
    elsif @is_multiline and @byte_pointer == @line.bytesize and @buffer_of_lines.size > @line_index + 1
      @cursor = calculate_width(@line)
      @byte_pointer = @line.bytesize
      @line += @buffer_of_lines.delete_at(@line_index + 1)
      @cursor_max = calculate_width(@line)
      @buffer_of_lines[@line_index] = @line
      @rerender_all = true
      @rest_height += 1
    end
  end
  alias_method :delete_char, :em_delete

private def em_delete_or_list(key)
    if @line.empty? or @byte_pointer < @line.bytesize
      em_delete(key)
    else # show completed list
      result = call_completion_proc
      if result.is_a?(Array)
        complete(result, true)
      end
    end
  end
  alias_method :delete_char_or_list, :em_delete_or_list

private def em_yank(key)
    yanked = @kill_ring.yank
    if yanked
      @line = byteinsert(@line, @byte_pointer, yanked)
      yanked_width = calculate_width(yanked)
      @cursor += yanked_width
      @cursor_max += yanked_width
      @byte_pointer += yanked.bytesize
    end
  end

private def em_yank_pop(key)
    yanked, prev_yank = @kill_ring.yank_pop
    if yanked
      prev_yank_width = calculate_width(prev_yank)
      @cursor -= prev_yank_width
      @cursor_max -= prev_yank_width
      @byte_pointer -= prev_yank.bytesize
      @line, = byteslice!(@line, @byte_pointer, prev_yank.bytesize)
      @line = byteinsert(@line, @byte_pointer, yanked)
      yanked_width = calculate_width(yanked)
      @cursor += yanked_width
      @cursor_max += yanked_width
      @byte_pointer += yanked.bytesize
    end
  end

private def ed_clear_screen(key)
    @cleared = true
  end
  alias_method :clear_screen, :ed_clear_screen

private def em_next_word(key)
    if @line.bytesize > @byte_pointer
      byte_size, width = Reline::Unicode.em_forward_word(@line, @byte_pointer)
      @byte_pointer += byte_size
      @cursor += width
    end
  end
  alias_method :forward_word, :em_next_word

private def ed_prev_word(key)
    if @byte_pointer > 0
      byte_size, width = Reline::Unicode.em_backward_word(@line, @byte_pointer)
      @byte_pointer -= byte_size
      @cursor -= width
    end
  end
  alias_method :backward_word, :ed_prev_word

private def em_delete_next_word(key)
    if @line.bytesize > @byte_pointer
      byte_size, width = Reline::Unicode.em_forward_word(@line, @byte_pointer)
      @line, word = byteslice!(@line, @byte_pointer, byte_size)
      @kill_ring.append(word)
      @cursor_max -= width
    end
  end

private def ed_delete_prev_word(key)
    if @byte_pointer > 0
      byte_size, width = Reline::Unicode.em_backward_word(@line, @byte_pointer)
      @line, word = byteslice!(@line, @byte_pointer - byte_size, byte_size)
      @kill_ring.append(word, true)
      @byte_pointer -= byte_size
      @cursor -= width
      @cursor_max -= width
    end
  end

private def ed_transpose_chars(key)
    if @byte_pointer > 0
      if @cursor_max > @cursor
        byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
        mbchar = @line.byteslice(@byte_pointer, byte_size)
        width = Reline::Unicode.get_mbchar_width(mbchar)
        @cursor += width
        @byte_pointer += byte_size
      end
      back1_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
      if (@byte_pointer - back1_byte_size) > 0
        back2_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer - back1_byte_size)
        back2_pointer = @byte_pointer - back1_byte_size - back2_byte_size
        @line, back2_mbchar = byteslice!(@line, back2_pointer, back2_byte_size)
        @line = byteinsert(@line, @byte_pointer - back2_byte_size, back2_mbchar)
      end
    end
  end
  alias_method :transpose_chars, :ed_transpose_chars

private def ed_transpose_words(key)
    left_word_start, middle_start, right_word_start, after_start = Reline::Unicode.ed_transpose_words(@line, @byte_pointer)
    before = @line.byteslice(0, left_word_start)
    left_word = @line.byteslice(left_word_start, middle_start - left_word_start)
    middle = @line.byteslice(middle_start, right_word_start - middle_start)
    right_word = @line.byteslice(right_word_start, after_start - right_word_start)
    after = @line.byteslice(after_start, @line.bytesize - after_start)
    return if left_word.empty? or right_word.empty?
    @line = before + right_word + middle + left_word + after
    from_head_to_left_word = before + right_word + middle + left_word
    @byte_pointer = from_head_to_left_word.bytesize
    @cursor = calculate_width(from_head_to_left_word)
  end
  alias_method :transpose_words, :ed_transpose_words

private def em_capitol_case(key)
    if @line.bytesize > @byte_pointer
      byte_size, _, new_str = Reline::Unicode.em_forward_word_with_capitalization(@line, @byte_pointer)
      before = @line.byteslice(0, @byte_pointer)
      after = @line.byteslice((@byte_pointer + byte_size)..-1)
      @line = before + new_str + after
      @byte_pointer += new_str.bytesize
      @cursor += calculate_width(new_str)
    end
  end
  alias_method :capitalize_word, :em_capitol_case

private def em_lower_case(key)
    if @line.bytesize > @byte_pointer
      byte_size, = Reline::Unicode.em_forward_word(@line, @byte_pointer)
      part = @line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
        mbchar =~ /[A-Z]/ ? mbchar.downcase : mbchar
      }.join
      rest = @line.byteslice((@byte_pointer + byte_size)..-1)
      @line = @line.byteslice(0, @byte_pointer) + part
      @byte_pointer = @line.bytesize
      @cursor = calculate_width(@line)
      @cursor_max = @cursor + calculate_width(rest)
      @line += rest
    end
  end
  alias_method :downcase_word, :em_lower_case

private def em_upper_case(key)
    if @line.bytesize > @byte_pointer
      byte_size, = Reline::Unicode.em_forward_word(@line, @byte_pointer)
      part = @line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
        mbchar =~ /[a-z]/ ? mbchar.upcase : mbchar
      }.join
      rest = @line.byteslice((@byte_pointer + byte_size)..-1)
      @line = @line.byteslice(0, @byte_pointer) + part
      @byte_pointer = @line.bytesize
      @cursor = calculate_width(@line)
      @cursor_max = @cursor + calculate_width(rest)
      @line += rest
    end
  end
  alias_method :upcase_word, :em_upper_case

private def em_kill_region(key)
    if @byte_pointer > 0
      byte_size, width = Reline::Unicode.em_big_backward_word(@line, @byte_pointer)
      @line, deleted = byteslice!(@line, @byte_pointer - byte_size, byte_size)
      @byte_pointer -= byte_size
      @cursor -= width
      @cursor_max -= width
      @kill_ring.append(deleted)
    end
  end

private def copy_for_vi(text)
    if @config.editing_mode_is?(:vi_insert) or @config.editing_mode_is?(:vi_command)
      @vi_clipboard = text
    end
  end

private def vi_insert(key)
    @config.editing_mode = :vi_insert
  end

private def vi_add(key)
    @config.editing_mode = :vi_insert
    ed_next_char(key)
  end

private def vi_command_mode(key)
    ed_prev_char(key)
    @config.editing_mode = :vi_command
  end
  alias_method :backward_char, :ed_prev_char

private def vi_next_word(key, arg: 1)
    if @line.bytesize > @byte_pointer
      byte_size, width = Reline::Unicode.vi_forward_word(@line, @byte_pointer)
      @byte_pointer += byte_size
      @cursor += width
    end
    arg -= 1
    vi_next_word(key, arg: arg) if arg > 0
  end

private def vi_prev_word(key, arg: 1)
    if @byte_pointer > 0
      byte_size, width = Reline::Unicode.vi_backward_word(@line, @byte_pointer)
      @byte_pointer -= byte_size
      @cursor -= width
    end
    arg -= 1
    vi_prev_word(key, arg: arg) if arg > 0
  end

private def vi_end_word(key, arg: 1)
    if @line.bytesize > @byte_pointer
      byte_size, width = Reline::Unicode.vi_forward_end_word(@line, @byte_pointer)
      @byte_pointer += byte_size
      @cursor += width
    end
    arg -= 1
    vi_end_word(key, arg: arg) if arg > 0
  end

private def vi_next_big_word(key, arg: 1)
    if @line.bytesize > @byte_pointer
      byte_size, width = Reline::Unicode.vi_big_forward_word(@line, @byte_pointer)
      @byte_pointer += byte_size
      @cursor += width
    end
    arg -= 1
    vi_next_big_word(key, arg: arg) if arg > 0
  end

private def vi_prev_big_word(key, arg: 1)
    if @byte_pointer > 0
      byte_size, width = Reline::Unicode.vi_big_backward_word(@line, @byte_pointer)
      @byte_pointer -= byte_size
      @cursor -= width
    end
    arg -= 1
    vi_prev_big_word(key, arg: arg) if arg > 0
  end

private def vi_end_big_word(key, arg: 1)
    if @line.bytesize > @byte_pointer
      byte_size, width = Reline::Unicode.vi_big_forward_end_word(@line, @byte_pointer)
      @byte_pointer += byte_size
      @cursor += width
    end
    arg -= 1
    vi_end_big_word(key, arg: arg) if arg > 0
  end

private def vi_delete_prev_char(key)
    if @is_multiline and @cursor == 0 and @line_index > 0
      @buffer_of_lines[@line_index] = @line
      @cursor = calculate_width(@buffer_of_lines[@line_index - 1])
      @byte_pointer = @buffer_of_lines[@line_index - 1].bytesize
      @buffer_of_lines[@line_index - 1] += @buffer_of_lines.delete_at(@line_index)
      @line_index -= 1
      @line = @buffer_of_lines[@line_index]
      @cursor_max = calculate_width(@line)
      @rerender_all = true
    elsif @cursor > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
      @byte_pointer -= byte_size
      @line, mbchar = byteslice!(@line, @byte_pointer, byte_size)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor -= width
      @cursor_max -= width
    end
  end

private def vi_insert_at_bol(key)
    ed_move_to_beg(key)
    @config.editing_mode = :vi_insert
  end

private def vi_add_at_eol(key)
    ed_move_to_end(key)
    @config.editing_mode = :vi_insert
  end

private def ed_delete_prev_char(key, arg: 1)
    deleted = ''
    arg.times do
      if @cursor > 0
        byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
        @byte_pointer -= byte_size
        @line, mbchar = byteslice!(@line, @byte_pointer, byte_size)
        deleted.prepend(mbchar)
        width = Reline::Unicode.get_mbchar_width(mbchar)
        @cursor -= width
        @cursor_max -= width
      end
    end
    copy_for_vi(deleted)
  end

private def vi_zero(key)
    @byte_pointer = 0
    @cursor = 0
  end

private def vi_change_meta(key)
    @waiting_operator_proc = proc { |cursor_diff, byte_pointer_diff|
      if byte_pointer_diff > 0
        @line, cut = byteslice!(@line, @byte_pointer, byte_pointer_diff)
      elsif byte_pointer_diff < 0
        @line, cut = byteslice!(@line, @byte_pointer + byte_pointer_diff, -byte_pointer_diff)
      end
      copy_for_vi(cut)
      @cursor += cursor_diff if cursor_diff < 0
      @cursor_max -= cursor_diff.abs
      @byte_pointer += byte_pointer_diff if byte_pointer_diff < 0
      @config.editing_mode = :vi_insert
    }
  end

private def vi_delete_meta(key)
    @waiting_operator_proc = proc { |cursor_diff, byte_pointer_diff|
      if byte_pointer_diff > 0
        @line, cut = byteslice!(@line, @byte_pointer, byte_pointer_diff)
      elsif byte_pointer_diff < 0
        @line, cut = byteslice!(@line, @byte_pointer + byte_pointer_diff, -byte_pointer_diff)
      end
      copy_for_vi(cut)
      @cursor += cursor_diff if cursor_diff < 0
      @cursor_max -= cursor_diff.abs
      @byte_pointer += byte_pointer_diff if byte_pointer_diff < 0
    }
  end

private def vi_yank(key)
  end

private def vi_list_or_eof(key)
    if (not @is_multiline and @line.empty?) or (@is_multiline and @line.empty? and @buffer_of_lines.size == 1)
      @line = nil
      if @buffer_of_lines.size > 1
        scroll_down(@highest_in_all - @first_line_started_from)
      end
      Reline::IOGate.move_cursor_column(0)
      @eof = true
      finish
    else
      ed_newline(key)
    end
  end
  alias_method :vi_end_of_transmission, :vi_list_or_eof
  alias_method :vi_eof_maybe, :vi_list_or_eof

private def ed_delete_next_char(key, arg: 1)
    byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
    unless @line.empty? || byte_size == 0
      @line, mbchar = byteslice!(@line, @byte_pointer, byte_size)
      copy_for_vi(mbchar)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor_max -= width
      if @cursor > 0 and @cursor >= @cursor_max
        @byte_pointer -= byte_size
        @cursor -= width
      end
    end
    arg -= 1
    ed_delete_next_char(key, arg: arg) if arg > 0
  end

private def vi_to_history_line(key)
    if Reline::HISTORY.empty?
      return
    end
    if @history_pointer.nil?
      @history_pointer = 0
      @line_backup_in_history = @line
      @line = Reline::HISTORY[@history_pointer]
      @cursor_max = calculate_width(@line)
      @cursor = 0
      @byte_pointer = 0
    elsif @history_pointer.zero?
      return
    else
      Reline::HISTORY[@history_pointer] = @line
      @history_pointer = 0
      @line = Reline::HISTORY[@history_pointer]
      @cursor_max = calculate_width(@line)
      @cursor = 0
      @byte_pointer = 0
    end
  end

private def vi_histedit(key)
    path = Tempfile.open { |fp|
      fp.write @line
      fp.path
    }
    system("#{ENV['EDITOR']} #{path}")
    @line = File.read(path)
    finish
  end

private def vi_paste_prev(key, arg: 1)
    if @vi_clipboard.size > 0
      @line = byteinsert(@line, @byte_pointer, @vi_clipboard)
      @cursor_max += calculate_width(@vi_clipboard)
      cursor_point = @vi_clipboard.grapheme_clusters[0..-2].join
      @cursor += calculate_width(cursor_point)
      @byte_pointer += cursor_point.bytesize
    end
    arg -= 1
    vi_paste_prev(key, arg: arg) if arg > 0
  end

private def vi_paste_next(key, arg: 1)
    if @vi_clipboard.size > 0
      byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
      @line = byteinsert(@line, @byte_pointer + byte_size, @vi_clipboard)
      @cursor_max += calculate_width(@vi_clipboard)
      @cursor += calculate_width(@vi_clipboard)
      @byte_pointer += @vi_clipboard.bytesize
    end
    arg -= 1
    vi_paste_next(key, arg: arg) if arg > 0
  end

private def ed_argument_digit(key)
    if @vi_arg.nil?
      unless key.chr.to_i.zero?
        @vi_arg = key.chr.to_i
      end
    else
      @vi_arg = @vi_arg * 10 + key.chr.to_i
    end
  end

private def vi_to_column(key, arg: 0)
    @byte_pointer, @cursor = @line.grapheme_clusters.inject([0, 0]) { |total, gc|
      # total has [byte_size, cursor]
      mbchar_width = Reline::Unicode.get_mbchar_width(gc)
      if (total.last + mbchar_width) >= arg
        break total
      elsif (total.last + mbchar_width) >= @cursor_max
        break total
      else
        total = [total.first + gc.bytesize, total.last + mbchar_width]
        total
      end
    }
  end

private def vi_replace_char(key, arg: 1)
    @waiting_proc = ->(k) {
      if arg == 1
        byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
        before = @line.byteslice(0, @byte_pointer)
        remaining_point = @byte_pointer + byte_size
        after = @line.byteslice(remaining_point, @line.size - remaining_point)
        @line = before + k.chr + after
        @cursor_max = calculate_width(@line)
        @waiting_proc = nil
      elsif arg > 1
        byte_size = 0
        arg.times do
          byte_size += Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer + byte_size)
        end
        before = @line.byteslice(0, @byte_pointer)
        remaining_point = @byte_pointer + byte_size
        after = @line.byteslice(remaining_point, @line.size - remaining_point)
        replaced = k.chr * arg
        @line = before + replaced + after
        @byte_pointer += replaced.bytesize
        @cursor += calculate_width(replaced)
        @cursor_max = calculate_width(@line)
        @waiting_proc = nil
      end
    }
  end

private def vi_next_char(key, arg: 1)
    @waiting_proc = ->(key_for_proc) { search_next_char(key_for_proc, arg) }
  end

private def vi_to_next_char(key, arg: 1)
    @waiting_proc = ->(key_for_proc) { search_next_char(key_for_proc, arg, true) }
  end

private def search_next_char(key, arg, need_prev_char = false)
    if key.instance_of?(String)
      inputed_char = key
    else
      inputed_char = key.chr
    end
    prev_total = nil
    total = nil
    found = false
    @line.byteslice(@byte_pointer..-1).grapheme_clusters.each do |mbchar|
      # total has [byte_size, cursor]
      unless total
        # skip cursor point
        width = Reline::Unicode.get_mbchar_width(mbchar)
        total = [mbchar.bytesize, width]
      else
        if inputed_char == mbchar
          arg -= 1
          if arg.zero?
            found = true
            break
          end
        end
        width = Reline::Unicode.get_mbchar_width(mbchar)
        prev_total = total
        total = [total.first + mbchar.bytesize, total.last + width]
      end
    end
    if not need_prev_char and found and total
      byte_size, width = total
      @byte_pointer += byte_size
      @cursor += width
    elsif need_prev_char and found and prev_total
      byte_size, width = prev_total
      @byte_pointer += byte_size
      @cursor += width
    end
    @waiting_proc = nil
  end

private def vi_prev_char(key, arg: 1)
    @waiting_proc = ->(key_for_proc) { search_prev_char(key_for_proc, arg) }
  end

private def vi_to_prev_char(key, arg: 1)
    @waiting_proc = ->(key_for_proc) { search_prev_char(key_for_proc, arg, true) }
  end

private def search_prev_char(key, arg, need_next_char = false)
    if key.instance_of?(String)
      inputed_char = key
    else
      inputed_char = key.chr
    end
    prev_total = nil
    total = nil
    found = false
    @line.byteslice(0..@byte_pointer).grapheme_clusters.reverse_each do |mbchar|
      # total has [byte_size, cursor]
      unless total
        # skip cursor point
        width = Reline::Unicode.get_mbchar_width(mbchar)
        total = [mbchar.bytesize, width]
      else
        if inputed_char == mbchar
          arg -= 1
          if arg.zero?
            found = true
            break
          end
        end
        width = Reline::Unicode.get_mbchar_width(mbchar)
        prev_total = total
        total = [total.first + mbchar.bytesize, total.last + width]
      end
    end
    if not need_next_char and found and total
      byte_size, width = total
      @byte_pointer -= byte_size
      @cursor -= width
    elsif need_next_char and found and prev_total
      byte_size, width = prev_total
      @byte_pointer -= byte_size
      @cursor -= width
    end
    @waiting_proc = nil
  end

private def vi_join_lines(key, arg: 1)
    if @is_multiline and @buffer_of_lines.size > @line_index + 1
      @cursor = calculate_width(@line)
      @byte_pointer = @line.bytesize
      @line += ' ' + @buffer_of_lines.delete_at(@line_index + 1).lstrip
      @cursor_max = calculate_width(@line)
      @buffer_of_lines[@line_index] = @line
      @rerender_all = true
      @rest_height += 1
    end
    arg -= 1
    vi_join_lines(key, arg: arg) if arg > 0
  end

private def em_set_mark(key)
    @mark_pointer = [@byte_pointer, @line_index]
  end
  alias_method :set_mark, :em_set_mark

private def em_exchange_mark(key)
    new_pointer = [@byte_pointer, @line_index]
    @previous_line_index = @line_index
    @byte_pointer, @line_index = @mark_pointer
    @cursor = calculate_width(@line.byteslice(0, @byte_pointer))
    @cursor_max = calculate_width(@line)
    @mark_pointer = new_pointer
  end
  alias_method :exchange_point_and_mark, :em_exchange_mark
end

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