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Edit File : file_utils_ext.rb \| Size : 4.10 KB
require 'rake/file_utils' module Rake # # FileUtilsExt provides a custom version of the FileUtils methods # that respond to the <tt>verbose</tt> and <tt>nowrite</tt> # commands. # module FileUtilsExt include FileUtils class << self attr_accessor :verbose_flag, :nowrite_flag end DEFAULT = Object.new FileUtilsExt.verbose_flag = DEFAULT FileUtilsExt.nowrite_flag = false $fileutils_verbose = true $fileutils_nowrite = false FileUtils.commands.each do \|name\| opts = FileUtils.options_of name default_options = [] if opts.include?("verbose") default_options << ':verbose => FileUtilsExt.verbose_flag' end if opts.include?("noop") default_options << ':noop => FileUtilsExt.nowrite_flag' end next if default_options.empty? module_eval(<<-EOS, __FILE__, __LINE__ + 1) def #{name}( args, &block ) super( rake_merge_option(args, #{default_options.join(', ')} ), &block) end EOS end # Get/set the verbose flag controlling output from the FileUtils # utilities. If verbose is true, then the utility method is # echoed to standard output. # # Examples: # verbose # return the current value of the # # verbose flag # verbose(v) # set the verbose flag to _v_. # verbose(v) { code } # Execute code with the verbose flag set # # temporarily to _v_. Return to the # # original value when code is done. def verbose(value=nil) oldvalue = FileUtilsExt.verbose_flag FileUtilsExt.verbose_flag = value unless value.nil? if block_given? begin yield ensure FileUtilsExt.verbose_flag = oldvalue end end FileUtilsExt.verbose_flag end # Get/set the nowrite flag controlling output from the FileUtils # utilities. If verbose is true, then the utility method is # echoed to standard output. # # Examples: # nowrite # return the current value of the # # nowrite flag # nowrite(v) # set the nowrite flag to _v_. # nowrite(v) { code } # Execute code with the nowrite flag set # # temporarily to _v_. Return to the # # original value when code is done. def nowrite(value=nil) oldvalue = FileUtilsExt.nowrite_flag FileUtilsExt.nowrite_flag = value unless value.nil? if block_given? begin yield ensure FileUtilsExt.nowrite_flag = oldvalue end end oldvalue end # Use this function to prevent potentially destructive ruby code # from running when the :nowrite flag is set. # # Example: # # when_writing("Building Project") do # project.build # end # # The following code will build the project under normal # conditions. If the nowrite(true) flag is set, then the example # will print: # # DRYRUN: Building Project # # instead of actually building the project. # def when_writing(msg=nil) if FileUtilsExt.nowrite_flag $stderr.puts "DRYRUN: #{msg}" if msg else yield end end # Merge the given options with the default values. def rake_merge_option(args, defaults) if Hash === args.last defaults.update(args.last) args.pop end args.push defaults args end # Send the message to the default rake output (which is $stderr). def rake_output_message(message) $stderr.puts(message) end # Check that the options do not contain options not listed in # +optdecl+. An ArgumentError exception is thrown if non-declared # options are found. def rake_check_options(options, *optdecl) h = options.dup optdecl.each do \|name\| h.delete name end raise ArgumentError, "no such option: #{h.keys.join(' ')}" unless h.empty? end extend self end end Back

Edit File : file_utils_ext.rb | Size : 4.10 KB

require 'rake/file_utils'

module Rake
  #
  # FileUtilsExt provides a custom version of the FileUtils methods
  # that respond to the <tt>verbose</tt> and <tt>nowrite</tt>
  # commands.
  #
  module FileUtilsExt
    include FileUtils

class << self
      attr_accessor :verbose_flag, :nowrite_flag
    end

DEFAULT = Object.new

FileUtilsExt.verbose_flag = DEFAULT
    FileUtilsExt.nowrite_flag = false

$fileutils_verbose = true
    $fileutils_nowrite = false

FileUtils.commands.each do |name|
      opts = FileUtils.options_of name
      default_options = []
      if opts.include?("verbose")
        default_options << ':verbose => FileUtilsExt.verbose_flag'
      end
      if opts.include?("noop")
        default_options << ':noop => FileUtilsExt.nowrite_flag'
      end

next if default_options.empty?
      module_eval(<<-EOS, __FILE__, __LINE__ + 1)
      def #{name}( *args, &block )
        super(
          *rake_merge_option(args,
            #{default_options.join(', ')}
            ), &block)
      end
      EOS
    end

# Get/set the verbose flag controlling output from the FileUtils
    # utilities.  If verbose is true, then the utility method is
    # echoed to standard output.
    #
    # Examples:
    #    verbose              # return the current value of the
    #                         # verbose flag
    #    verbose(v)           # set the verbose flag to _v_.
    #    verbose(v) { code }  # Execute code with the verbose flag set
    #                         # temporarily to _v_.  Return to the
    #                         # original value when code is done.
    def verbose(value=nil)
      oldvalue = FileUtilsExt.verbose_flag
      FileUtilsExt.verbose_flag = value unless value.nil?
      if block_given?
        begin
          yield
        ensure
          FileUtilsExt.verbose_flag = oldvalue
        end
      end
      FileUtilsExt.verbose_flag
    end

# Get/set the nowrite flag controlling output from the FileUtils
    # utilities.  If verbose is true, then the utility method is
    # echoed to standard output.
    #
    # Examples:
    #    nowrite              # return the current value of the
    #                         # nowrite flag
    #    nowrite(v)           # set the nowrite flag to _v_.
    #    nowrite(v) { code }  # Execute code with the nowrite flag set
    #                         # temporarily to _v_. Return to the
    #                         # original value when code is done.
    def nowrite(value=nil)
      oldvalue = FileUtilsExt.nowrite_flag
      FileUtilsExt.nowrite_flag = value unless value.nil?
      if block_given?
        begin
          yield
        ensure
          FileUtilsExt.nowrite_flag = oldvalue
        end
      end
      oldvalue
    end

# Use this function to prevent potentially destructive ruby code
    # from running when the :nowrite flag is set.
    #
    # Example:
    #
    #   when_writing("Building Project") do
    #     project.build
    #   end
    #
    # The following code will build the project under normal
    # conditions. If the nowrite(true) flag is set, then the example
    # will print:
    #
    #      DRYRUN: Building Project
    #
    # instead of actually building the project.
    #
    def when_writing(msg=nil)
      if FileUtilsExt.nowrite_flag
        $stderr.puts "DRYRUN: #{msg}" if msg
      else
        yield
      end
    end

# Merge the given options with the default values.
    def rake_merge_option(args, defaults)
      if Hash === args.last
        defaults.update(args.last)
        args.pop
      end
      args.push defaults
      args
    end

# Send the message to the default rake output (which is $stderr).
    def rake_output_message(message)
      $stderr.puts(message)
    end

# Check that the options do not contain options not listed in
    # +optdecl+.  An ArgumentError exception is thrown if non-declared
    # options are found.
    def rake_check_options(options, *optdecl)
      h = options.dup
      optdecl.each do |name|
        h.delete name
      end
      raise ArgumentError, "no such option: #{h.keys.join(' ')}" unless h.empty?
    end

extend self
  end
end

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