module Rake::FileUtilsExt

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 77
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

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 133
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

Merge the given options with the default values.

# File lib/rake/file_utils_ext.rb, line 116
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).

# File lib/rake/file_utils_ext.rb, line 126
def rake_output_message(message)
  $stderr.puts(message)
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.

# File lib/rake/file_utils_ext.rb, line 53
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

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 107
def when_writing(msg=nil)
  if FileUtilsExt.nowrite_flag
    $stderr.puts "DRYRUN: #{msg}" if msg
  else
    yield
  end
end