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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.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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