# module Rake::RakeFileUtils

FileUtilsExt provides a custom version of the FileUtils methods that respond to the `verbose` and `nowrite` commands.

### Constants

DEFAULT

### Attributes

nowrite_flag[RW]
verbose_flag[RW]

### Public Instance Methods

nowrite(value=nil) { || ... } click to toggle source

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.

    # File lib/rake/file_utils_ext.rb, line 78
    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

rake_check_options(options, *optdecl) click to toggle source

Check that the options do not contain options not listed in `optdecl`. An ArgumentError exception is thrown if non-declared options are found.

    # File lib/rake/file_utils_ext.rb, line 134
    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

rake_merge_option(args, defaults) click to toggle source

Merge the given options with the default values.

    # File lib/rake/file_utils_ext.rb, line 117
    def rake_merge_option(args, defaults)
      if Hash === args.last
        defaults.update(args.last)
        args.pop
      end
      args.push defaults
      args
    end

rake_output_message(message) click to toggle source

Send the message to the default rake output (which is $stderr).

    # File lib/rake/file_utils_ext.rb, line 127
    def rake_output_message(message)
      $stderr.puts(message)
    end

verbose(value=nil) { || ... } click to toggle source

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.

    # File lib/rake/file_utils_ext.rb, line 54
    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

when_writing(msg=nil) { || ... } click to toggle source

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.

    # File lib/rake/file_utils_ext.rb, line 108
    def when_writing(msg=nil)
      if FileUtilsExt.nowrite_flag
        $stderr.puts "DRYRUN: #{msg}" if msg
      else
        yield
      end
    end