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Edit File : textpad.py \| Size : 7.17 KB
"""Simple textbox editing widget with Emacs-like keybindings.""" import curses import curses.ascii def rectangle(win, uly, ulx, lry, lrx): """Draw a rectangle with corners at the provided upper-left and lower-right coordinates. """ win.vline(uly+1, ulx, curses.ACS_VLINE, lry - uly - 1) win.hline(uly, ulx+1, curses.ACS_HLINE, lrx - ulx - 1) win.hline(lry, ulx+1, curses.ACS_HLINE, lrx - ulx - 1) win.vline(uly+1, lrx, curses.ACS_VLINE, lry - uly - 1) win.addch(uly, ulx, curses.ACS_ULCORNER) win.addch(uly, lrx, curses.ACS_URCORNER) win.addch(lry, lrx, curses.ACS_LRCORNER) win.addch(lry, ulx, curses.ACS_LLCORNER) class Textbox: """Editing widget using the interior of a window object. Supports the following Emacs-like key bindings: Ctrl-A Go to left edge of window. Ctrl-B Cursor left, wrapping to previous line if appropriate. Ctrl-D Delete character under cursor. Ctrl-E Go to right edge (stripspaces off) or end of line (stripspaces on). Ctrl-F Cursor right, wrapping to next line when appropriate. Ctrl-G Terminate, returning the window contents. Ctrl-H Delete character backward. Ctrl-J Terminate if the window is 1 line, otherwise insert newline. Ctrl-K If line is blank, delete it, otherwise clear to end of line. Ctrl-L Refresh screen. Ctrl-N Cursor down; move down one line. Ctrl-O Insert a blank line at cursor location. Ctrl-P Cursor up; move up one line. Move operations do nothing if the cursor is at an edge where the movement is not possible. The following synonyms are supported where possible: KEY_LEFT = Ctrl-B, KEY_RIGHT = Ctrl-F, KEY_UP = Ctrl-P, KEY_DOWN = Ctrl-N KEY_BACKSPACE = Ctrl-h """ def __init__(self, win, insert_mode=False): self.win = win self.insert_mode = insert_mode (self.maxy, self.maxx) = win.getmaxyx() self.maxy = self.maxy - 1 self.maxx = self.maxx - 1 self.stripspaces = 1 self.lastcmd = None win.keypad(1) def _end_of_line(self, y): """Go to the location of the first blank on the given line, returning the index of the last non-blank character.""" last = self.maxx while True: if curses.ascii.ascii(self.win.inch(y, last)) != curses.ascii.SP: last = min(self.maxx, last+1) break elif last == 0: break last = last - 1 return last def _insert_printable_char(self, ch): (y, x) = self.win.getyx() if y < self.maxy or x < self.maxx: if self.insert_mode: oldch = self.win.inch() # The try-catch ignores the error we trigger from some curses # versions by trying to write into the lowest-rightmost spot # in the window. try: self.win.addch(ch) except curses.error: pass if self.insert_mode: (backy, backx) = self.win.getyx() if curses.ascii.isprint(oldch): self._insert_printable_char(oldch) self.win.move(backy, backx) def do_command(self, ch): "Process a single editing command." (y, x) = self.win.getyx() self.lastcmd = ch if curses.ascii.isprint(ch): if y < self.maxy or x < self.maxx: self._insert_printable_char(ch) elif ch == curses.ascii.SOH: # ^a self.win.move(y, 0) elif ch in (curses.ascii.STX,curses.KEY_LEFT, curses.ascii.BS,curses.KEY_BACKSPACE): if x > 0: self.win.move(y, x-1) elif y == 0: pass elif self.stripspaces: self.win.move(y-1, self._end_of_line(y-1)) else: self.win.move(y-1, self.maxx) if ch in (curses.ascii.BS, curses.KEY_BACKSPACE): self.win.delch() elif ch == curses.ascii.EOT: # ^d self.win.delch() elif ch == curses.ascii.ENQ: # ^e if self.stripspaces: self.win.move(y, self._end_of_line(y)) else: self.win.move(y, self.maxx) elif ch in (curses.ascii.ACK, curses.KEY_RIGHT): # ^f if x < self.maxx: self.win.move(y, x+1) elif y == self.maxy: pass else: self.win.move(y+1, 0) elif ch == curses.ascii.BEL: # ^g return 0 elif ch == curses.ascii.NL: # ^j if self.maxy == 0: return 0 elif y < self.maxy: self.win.move(y+1, 0) elif ch == curses.ascii.VT: # ^k if x == 0 and self._end_of_line(y) == 0: self.win.deleteln() else: # first undo the effect of self._end_of_line self.win.move(y, x) self.win.clrtoeol() elif ch == curses.ascii.FF: # ^l self.win.refresh() elif ch in (curses.ascii.SO, curses.KEY_DOWN): # ^n if y < self.maxy: self.win.move(y+1, x) if x > self._end_of_line(y+1): self.win.move(y+1, self._end_of_line(y+1)) elif ch == curses.ascii.SI: # ^o self.win.insertln() elif ch in (curses.ascii.DLE, curses.KEY_UP): # ^p if y > 0: self.win.move(y-1, x) if x > self._end_of_line(y-1): self.win.move(y-1, self._end_of_line(y-1)) return 1 def gather(self): "Collect and return the contents of the window." result = "" for y in range(self.maxy+1): self.win.move(y, 0) stop = self._end_of_line(y) if stop == 0 and self.stripspaces: continue for x in range(self.maxx+1): if self.stripspaces and x > stop: break result = result + chr(curses.ascii.ascii(self.win.inch(y, x))) if self.maxy > 0: result = result + "\n" return result def edit(self, validate=None): "Edit in the widget window and collect the results." while 1: ch = self.win.getch() if validate: ch = validate(ch) if not ch: continue if not self.do_command(ch): break self.win.refresh() return self.gather() if __name__ == '__main__': def test_editbox(stdscr): ncols, nlines = 9, 4 uly, ulx = 15, 20 stdscr.addstr(uly-2, ulx, "Use Ctrl-G to end editing.") win = curses.newwin(nlines, ncols, uly, ulx) rectangle(stdscr, uly-1, ulx-1, uly + nlines, ulx + ncols) stdscr.refresh() return Textbox(win).edit() str = curses.wrapper(test_editbox) print('Contents of text box:', repr(str)) Back

Edit File : textpad.py | Size : 7.17 KB

"""Simple textbox editing widget with Emacs-like keybindings."""

import curses
import curses.ascii

def rectangle(win, uly, ulx, lry, lrx):
    """Draw a rectangle with corners at the provided upper-left
    and lower-right coordinates.
    """
    win.vline(uly+1, ulx, curses.ACS_VLINE, lry - uly - 1)
    win.hline(uly, ulx+1, curses.ACS_HLINE, lrx - ulx - 1)
    win.hline(lry, ulx+1, curses.ACS_HLINE, lrx - ulx - 1)
    win.vline(uly+1, lrx, curses.ACS_VLINE, lry - uly - 1)
    win.addch(uly, ulx, curses.ACS_ULCORNER)
    win.addch(uly, lrx, curses.ACS_URCORNER)
    win.addch(lry, lrx, curses.ACS_LRCORNER)
    win.addch(lry, ulx, curses.ACS_LLCORNER)

class Textbox:
    """Editing widget using the interior of a window object.
     Supports the following Emacs-like key bindings:

Ctrl-A      Go to left edge of window.
    Ctrl-B      Cursor left, wrapping to previous line if appropriate.
    Ctrl-D      Delete character under cursor.
    Ctrl-E      Go to right edge (stripspaces off) or end of line (stripspaces on).
    Ctrl-F      Cursor right, wrapping to next line when appropriate.
    Ctrl-G      Terminate, returning the window contents.
    Ctrl-H      Delete character backward.
    Ctrl-J      Terminate if the window is 1 line, otherwise insert newline.
    Ctrl-K      If line is blank, delete it, otherwise clear to end of line.
    Ctrl-L      Refresh screen.
    Ctrl-N      Cursor down; move down one line.
    Ctrl-O      Insert a blank line at cursor location.
    Ctrl-P      Cursor up; move up one line.

Move operations do nothing if the cursor is at an edge where the movement
    is not possible.  The following synonyms are supported where possible:

KEY_LEFT = Ctrl-B, KEY_RIGHT = Ctrl-F, KEY_UP = Ctrl-P, KEY_DOWN = Ctrl-N
    KEY_BACKSPACE = Ctrl-h
    """
    def __init__(self, win, insert_mode=False):
        self.win = win
        self.insert_mode = insert_mode
        (self.maxy, self.maxx) = win.getmaxyx()
        self.maxy = self.maxy - 1
        self.maxx = self.maxx - 1
        self.stripspaces = 1
        self.lastcmd = None
        win.keypad(1)

def _end_of_line(self, y):
        """Go to the location of the first blank on the given line,
        returning the index of the last non-blank character."""
        last = self.maxx
        while True:
            if curses.ascii.ascii(self.win.inch(y, last)) != curses.ascii.SP:
                last = min(self.maxx, last+1)
                break
            elif last == 0:
                break
            last = last - 1
        return last

def _insert_printable_char(self, ch):
        (y, x) = self.win.getyx()
        if y < self.maxy or x < self.maxx:
            if self.insert_mode:
                oldch = self.win.inch()
            # The try-catch ignores the error we trigger from some curses
            # versions by trying to write into the lowest-rightmost spot
            # in the window.
            try:
                self.win.addch(ch)
            except curses.error:
                pass
            if self.insert_mode:
                (backy, backx) = self.win.getyx()
                if curses.ascii.isprint(oldch):
                    self._insert_printable_char(oldch)
                    self.win.move(backy, backx)

def do_command(self, ch):
        "Process a single editing command."
        (y, x) = self.win.getyx()
        self.lastcmd = ch
        if curses.ascii.isprint(ch):
            if y < self.maxy or x < self.maxx:
                self._insert_printable_char(ch)
        elif ch == curses.ascii.SOH:                           # ^a
            self.win.move(y, 0)
        elif ch in (curses.ascii.STX,curses.KEY_LEFT, curses.ascii.BS,curses.KEY_BACKSPACE):
            if x > 0:
                self.win.move(y, x-1)
            elif y == 0:
                pass
            elif self.stripspaces:
                self.win.move(y-1, self._end_of_line(y-1))
            else:
                self.win.move(y-1, self.maxx)
            if ch in (curses.ascii.BS, curses.KEY_BACKSPACE):
                self.win.delch()
        elif ch == curses.ascii.EOT:                           # ^d
            self.win.delch()
        elif ch == curses.ascii.ENQ:                           # ^e
            if self.stripspaces:
                self.win.move(y, self._end_of_line(y))
            else:
                self.win.move(y, self.maxx)
        elif ch in (curses.ascii.ACK, curses.KEY_RIGHT):       # ^f
            if x < self.maxx:
                self.win.move(y, x+1)
            elif y == self.maxy:
                pass
            else:
                self.win.move(y+1, 0)
        elif ch == curses.ascii.BEL:                           # ^g
            return 0
        elif ch == curses.ascii.NL:                            # ^j
            if self.maxy == 0:
                return 0
            elif y < self.maxy:
                self.win.move(y+1, 0)
        elif ch == curses.ascii.VT:                            # ^k
            if x == 0 and self._end_of_line(y) == 0:
                self.win.deleteln()
            else:
                # first undo the effect of self._end_of_line
                self.win.move(y, x)
                self.win.clrtoeol()
        elif ch == curses.ascii.FF:                            # ^l
            self.win.refresh()
        elif ch in (curses.ascii.SO, curses.KEY_DOWN):         # ^n
            if y < self.maxy:
                self.win.move(y+1, x)
                if x > self._end_of_line(y+1):
                    self.win.move(y+1, self._end_of_line(y+1))
        elif ch == curses.ascii.SI:                            # ^o
            self.win.insertln()
        elif ch in (curses.ascii.DLE, curses.KEY_UP):          # ^p
            if y > 0:
                self.win.move(y-1, x)
                if x > self._end_of_line(y-1):
                    self.win.move(y-1, self._end_of_line(y-1))
        return 1

def gather(self):
        "Collect and return the contents of the window."
        result = ""
        for y in range(self.maxy+1):
            self.win.move(y, 0)
            stop = self._end_of_line(y)
            if stop == 0 and self.stripspaces:
                continue
            for x in range(self.maxx+1):
                if self.stripspaces and x > stop:
                    break
                result = result + chr(curses.ascii.ascii(self.win.inch(y, x)))
            if self.maxy > 0:
                result = result + "\n"
        return result

def edit(self, validate=None):
        "Edit in the widget window and collect the results."
        while 1:
            ch = self.win.getch()
            if validate:
                ch = validate(ch)
            if not ch:
                continue
            if not self.do_command(ch):
                break
            self.win.refresh()
        return self.gather()

if __name__ == '__main__':
    def test_editbox(stdscr):
        ncols, nlines = 9, 4
        uly, ulx = 15, 20
        stdscr.addstr(uly-2, ulx, "Use Ctrl-G to end editing.")
        win = curses.newwin(nlines, ncols, uly, ulx)
        rectangle(stdscr, uly-1, ulx-1, uly + nlines, ulx + ncols)
        stdscr.refresh()
        return Textbox(win).edit()

str = curses.wrapper(test_editbox)
    print('Contents of text box:', repr(str))

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