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exec.rb
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exec.rb
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require 'optparse'
require 'fileutils'
module Sass
# This module handles the various Sass executables (`sass` and `sass-convert`).
module Exec
# An abstract class that encapsulates the executable code for all three executables.
class Generic
# @param args [Array<String>] The command-line arguments
def initialize(args)
@args = args
@options = {}
end
# Parses the command-line arguments and runs the executable.
# Calls `Kernel#exit` at the end, so it never returns.
#
# @see #parse
def parse!
begin
parse
rescue Exception => e
raise e if @options[:trace] || e.is_a?(SystemExit)
$stderr.print "#{e.class}: " unless e.class == RuntimeError
$stderr.puts "#{e.message}"
$stderr.puts " Use --trace for backtrace."
exit 1
end
exit 0
end
# Parses the command-line arguments and runs the executable.
# This does not handle exceptions or exit the program.
#
# @see #parse!
def parse
@opts = OptionParser.new(&method(:set_opts))
@opts.parse!(@args)
process_result
@options
end
# @return [String] A description of the executable
def to_s
@opts.to_s
end
protected
# Finds the line of the source template
# on which an exception was raised.
#
# @param exception [Exception] The exception
# @return [String] The line number
def get_line(exception)
# SyntaxErrors have weird line reporting
# when there's trailing whitespace
return (exception.message.scan(/:(\d+)/).first || ["??"]).first if exception.is_a?(::SyntaxError)
(exception.backtrace[0].scan(/:(\d+)/).first || ["??"]).first
end
# Tells optparse how to parse the arguments
# available for all executables.
#
# This is meant to be overridden by subclasses
# so they can add their own options.
#
# @param opts [OptionParser]
def set_opts(opts)
opts.on('-s', '--stdin', :NONE, 'Read input from standard input instead of an input file') do
@options[:input] = $stdin
end
opts.on('--trace', :NONE, 'Show a full traceback on error') do
@options[:trace] = true
end
opts.on('--unix-newlines', 'Use Unix-style newlines in written files.') do
@options[:unix_newlines] = true if ::Sass::Util.windows?
end
opts.on_tail("-?", "-h", "--help", "Show this message") do
puts opts
exit
end
opts.on_tail("-v", "--version", "Print version") do
puts("Sass #{::Sass.version[:string]}")
exit
end
end
# Processes the options set by the command-line arguments.
# In particular, sets `@options[:input]` and `@options[:output]`
# to appropriate IO streams.
#
# This is meant to be overridden by subclasses
# so they can run their respective programs.
def process_result
input, output = @options[:input], @options[:output]
args = @args.dup
input ||=
begin
filename = args.shift
@options[:filename] = filename
open_file(filename) || $stdin
end
output ||= open_file(args.shift, 'w') || $stdout
@options[:input], @options[:output] = input, output
end
COLORS = { :red => 31, :green => 32, :yellow => 33 }
# Prints a status message about performing the given action,
# colored using the given color (via terminal escapes) if possible.
#
# @param name [#to_s] A short name for the action being performed.
# Shouldn't be longer than 11 characters.
# @param color [Symbol] The name of the color to use for this action.
# Can be `:red`, `:green`, or `:yellow`.
def puts_action(name, color, arg)
return if @options[:for_engine][:quiet]
printf color(color, "%11s %s\n"), name, arg
end
# Same as \{Kernel.puts}, but doesn't print anything if the `--quiet` option is set.
#
# @param args [Array] Passed on to \{Kernel.puts}
def puts(*args)
return if @options[:for_engine][:quiet]
Kernel.puts(*args)
end
# Wraps the given string in terminal escapes
# causing it to have the given color.
# If terminal esapes aren't supported on this platform,
# just returns the string instead.
#
# @param color [Symbol] The name of the color to use.
# Can be `:red`, `:green`, or `:yellow`.
# @param str [String] The string to wrap in the given color.
# @return [String] The wrapped string.
def color(color, str)
raise "[BUG] Unrecognized color #{color}" unless COLORS[color]
# Almost any real Unix terminal will support color,
# so we just filter for Windows terms (which don't set TERM)
# and not-real terminals, which aren't ttys.
return str if ENV["TERM"].nil? || ENV["TERM"].empty? || !STDOUT.tty?
return "\e[#{COLORS[color]}m#{str}\e[0m"
end
private
def open_file(filename, flag = 'r')
return if filename.nil?
flag = 'wb' if @options[:unix_newlines] && flag == 'w'
File.open(filename, flag)
end
def handle_load_error(err)
dep = err.message[/^no such file to load -- (.*)/, 1]
raise err if @options[:trace] || dep.nil? || dep.empty?
$stderr.puts <<MESSAGE
Required dependency #{dep} not found!
Run "gem install #{dep}" to get it.
Use --trace for backtrace.
MESSAGE
exit 1
end
end
# The `sass` executable.
class Sass < Generic
attr_reader :default_syntax
# @param args [Array<String>] The command-line arguments
def initialize(args)
super
@options[:for_engine] = {
:load_paths => ['.'] + (ENV['SASSPATH'] || '').split(File::PATH_SEPARATOR)
}
@default_syntax = :sass
end
protected
# Tells optparse how to parse the arguments.
#
# @param opts [OptionParser]
def set_opts(opts)
super
opts.banner = <<END
Usage: #{default_syntax} [options] [INPUT] [OUTPUT]
Description:
Converts SCSS or Sass files to CSS.
Options:
END
if @default_syntax == :sass
opts.on('--scss',
'Use the CSS-superset SCSS syntax.') do
@options[:for_engine][:syntax] = :scss
end
else
opts.on('--sass',
'Use the Indented syntax.') do
@options[:for_engine][:syntax] = :sass
end
end
opts.on('--watch', 'Watch files or directories for changes.',
'The location of the generated CSS can be set using a colon:',
" #{@default_syntax} --watch input.#{@default_syntax}:output.css",
" #{@default_syntax} --watch input-dir:output-dir") do
@options[:watch] = true
end
opts.on('--update', 'Compile files or directories to CSS.',
'Locations are set like --watch.') do
@options[:update] = true
end
opts.on('--stop-on-error', 'If a file fails to compile, exit immediately.',
'Only meaningful for --watch and --update.') do
@options[:stop_on_error] = true
end
opts.on('-f', '--force', 'Recompile all Sass files, even if the CSS file is newer.',
'Only meaningful for --update.') do
@options[:force] = true
end
opts.on('-c', '--check', "Just check syntax, don't evaluate.") do
require 'stringio'
@options[:check_syntax] = true
@options[:output] = StringIO.new
end
opts.on('-t', '--style NAME',
'Output style. Can be nested (default), compact, compressed, or expanded.') do |name|
@options[:for_engine][:style] = name.to_sym
end
opts.on('--precision NUMBER_OF_DIGITS', Integer,
'How many digits of precision to use when outputting decimal numbers. Defaults to 3.') do |precision|
::Sass::Script::Number.precision = precision
end
opts.on('-q', '--quiet', 'Silence warnings and status messages during compilation.') do
@options[:for_engine][:quiet] = true
end
opts.on('--compass', 'Make Compass imports available and load project configuration.') do
@options[:compass] = true
end
opts.on('-g', '--debug-info',
'Emit extra information in the generated CSS that can be used by the FireSass Firebug plugin.') do
@options[:for_engine][:debug_info] = true
end
opts.on('-l', '--line-numbers', '--line-comments',
'Emit comments in the generated CSS indicating the corresponding source line.') do
@options[:for_engine][:line_numbers] = true
end
opts.on('-i', '--interactive',
'Run an interactive SassScript shell.') do
@options[:interactive] = true
end
opts.on('-I', '--load-path PATH', 'Add a sass import path.') do |path|
@options[:for_engine][:load_paths] << path
end
opts.on('-r', '--require LIB', 'Require a Ruby library before running Sass.') do |lib|
require lib
end
opts.on('--cache-location PATH', 'The path to put cached Sass files. Defaults to .sass-cache.') do |loc|
@options[:for_engine][:cache_location] = loc
end
opts.on('-C', '--no-cache', "Don't cache to sassc files.") do
@options[:for_engine][:cache] = false
end
unless ::Sass::Util.ruby1_8?
opts.on('-E encoding', 'Specify the default encoding for Sass files.') do |encoding|
Encoding.default_external = encoding
end
end
end
# Processes the options set by the command-line arguments,
# and runs the Sass compiler appropriately.
def process_result
require 'sass'
if !@options[:update] && !@options[:watch] &&
@args.first && colon_path?(@args.first)
if @args.size == 1
@args = split_colon_path(@args.first)
else
@options[:update] = true
end
end
load_compass if @options[:compass]
return interactive if @options[:interactive]
return watch_or_update if @options[:watch] || @options[:update]
super
@options[:for_engine][:filename] = @options[:filename]
begin
input = @options[:input]
output = @options[:output]
@options[:for_engine][:syntax] ||= :scss if input.is_a?(File) && input.path =~ /\.scss$/
@options[:for_engine][:syntax] ||= @default_syntax
engine =
if input.is_a?(File) && !@options[:check_syntax]
::Sass::Engine.for_file(input.path, @options[:for_engine])
else
# We don't need to do any special handling of @options[:check_syntax] here,
# because the Sass syntax checking happens alongside evaluation
# and evaluation doesn't actually evaluate any code anyway.
::Sass::Engine.new(input.read(), @options[:for_engine])
end
input.close() if input.is_a?(File)
output.write(engine.render)
output.close() if output.is_a? File
rescue ::Sass::SyntaxError => e
raise e if @options[:trace]
raise e.sass_backtrace_str("standard input")
end
end
private
def load_compass
begin
require 'compass'
rescue LoadError
require 'rubygems'
begin
require 'compass'
rescue LoadError
puts "ERROR: Cannot load compass."
exit 1
end
end
Compass.add_project_configuration
Compass.configuration.project_path ||= Dir.pwd
@options[:for_engine][:load_paths] += Compass.configuration.sass_load_paths
end
def interactive
require 'sass/repl'
::Sass::Repl.new(@options).run
end
def watch_or_update
require 'sass/plugin'
::Sass::Plugin.options.merge! @options[:for_engine]
::Sass::Plugin.options[:unix_newlines] = @options[:unix_newlines]
if @options[:force]
raise "The --force flag may only be used with --update." unless @options[:update]
::Sass::Plugin.options[:always_update] = true
end
raise <<MSG if @args.empty?
What files should I watch? Did you mean something like:
#{@default_syntax} --watch input.#{@default_syntax}:output.css
#{@default_syntax} --watch input-dir:output-dir
MSG
if !colon_path?(@args[0]) && probably_dest_dir?(@args[1])
flag = @options[:update] ? "--update" : "--watch"
err =
if !File.exist?(@args[1])
"doesn't exist"
elsif @args[1] =~ /\.css$/
"is a CSS file"
end
raise <<MSG if err
File #{@args[1]} #{err}.
Did you mean: #{@default_syntax} #{flag} #{@args[0]}:#{@args[1]}
MSG
end
dirs, files = @args.map {|name| split_colon_path(name)}.
partition {|i, _| File.directory? i}
files.map! {|from, to| [from, to || from.gsub(/\.[^.]*?$/, '.css')]}
dirs.map! {|from, to| [from, to || from]}
::Sass::Plugin.options[:template_location] = dirs
::Sass::Plugin.on_updated_stylesheet do |_, css|
if File.exists? css
puts_action :overwrite, :yellow, css
else
puts_action :create, :green, css
end
end
had_error = false
::Sass::Plugin.on_creating_directory {|dirname| puts_action :directory, :green, dirname}
::Sass::Plugin.on_deleting_css {|filename| puts_action :delete, :yellow, filename}
::Sass::Plugin.on_compilation_error do |error, _, _|
raise error unless error.is_a?(::Sass::SyntaxError) && !@options[:stop_on_error]
had_error = true
puts_action :error, :red, "#{error.sass_filename} (Line #{error.sass_line}: #{error.message})"
STDOUT.flush
end
if @options[:update]
::Sass::Plugin.update_stylesheets(files)
exit 1 if had_error
return
end
puts ">>> Sass is watching for changes. Press Ctrl-C to stop."
::Sass::Plugin.on_template_modified do |template|
puts ">>> Change detected to: #{template}"
STDOUT.flush
end
::Sass::Plugin.on_template_created do |template|
puts ">>> New template detected: #{template}"
STDOUT.flush
end
::Sass::Plugin.on_template_deleted do |template|
puts ">>> Deleted template detected: #{template}"
STDOUT.flush
end
::Sass::Plugin.watch(files)
end
def colon_path?(path)
!split_colon_path(path)[1].nil?
end
def split_colon_path(path)
one, two = path.split(':', 2)
if one && two && ::Sass::Util.windows? &&
one =~ /\A[A-Za-z]\Z/ && two =~ /\A[\/\\]/
# If we're on Windows and we were passed a drive letter path,
# don't split on that colon.
one2, two = two.split(':', 2)
one = one + ':' + one2
end
return one, two
end
# Whether path is likely to be meant as the destination
# in a source:dest pair.
def probably_dest_dir?(path)
return false unless path
return false if colon_path?(path)
return ::Sass::Util.glob(File.join(path, "*.s[ca]ss")).empty?
end
end
class Scss < Sass
# @param args [Array<String>] The command-line arguments
def initialize(args)
super
@default_syntax = :scss
end
end
# The `sass-convert` executable.
class SassConvert < Generic
# @param args [Array<String>] The command-line arguments
def initialize(args)
super
require 'sass'
@options[:for_tree] = {}
@options[:for_engine] = {:cache => false, :read_cache => true}
end
# Tells optparse how to parse the arguments.
#
# @param opts [OptionParser]
def set_opts(opts)
opts.banner = <<END
Usage: sass-convert [options] [INPUT] [OUTPUT]
Description:
Converts between CSS, Sass, and SCSS files.
E.g. converts from SCSS to Sass,
or converts from CSS to SCSS (adding appropriate nesting).
Options:
END
opts.on('-F', '--from FORMAT',
'The format to convert from. Can be css, scss, sass, less.',
'By default, this is inferred from the input filename.',
'If there is none, defaults to css.') do |name|
@options[:from] = name.downcase.to_sym
unless [:css, :scss, :sass, :less].include?(@options[:from])
raise "Unknown format for sass-convert --from: #{name}"
end
try_less_note if @options[:from] == :less
end
opts.on('-T', '--to FORMAT',
'The format to convert to. Can be scss or sass.',
'By default, this is inferred from the output filename.',
'If there is none, defaults to sass.') do |name|
@options[:to] = name.downcase.to_sym
unless [:scss, :sass].include?(@options[:to])
raise "Unknown format for sass-convert --to: #{name}"
end
end
opts.on('-R', '--recursive',
'Convert all the files in a directory. Requires --from and --to.') do
@options[:recursive] = true
end
opts.on('-i', '--in-place',
'Convert a file to its own syntax.',
'This can be used to update some deprecated syntax.') do
@options[:in_place] = true
end
opts.on('--dasherize', 'Convert underscores to dashes') do
@options[:for_tree][:dasherize] = true
end
opts.on('--old', 'Output the old-style ":prop val" property syntax.',
'Only meaningful when generating Sass.') do
@options[:for_tree][:old] = true
end
opts.on('-C', '--no-cache', "Don't cache to sassc files.") do
@options[:for_engine][:read_cache] = false
end
unless ::Sass::Util.ruby1_8?
opts.on('-E encoding', 'Specify the default encoding for Sass and CSS files.') do |encoding|
Encoding.default_external = encoding
end
end
super
end
# Processes the options set by the command-line arguments,
# and runs the CSS compiler appropriately.
def process_result
require 'sass'
if @options[:recursive]
process_directory
return
end
super
input = @options[:input]
raise "Error: '#{input.path}' is a directory (did you mean to use --recursive?)" if File.directory?(input)
output = @options[:output]
output = input if @options[:in_place]
process_file(input, output)
end
private
def process_directory
unless input = @options[:input] = @args.shift
raise "Error: directory required when using --recursive."
end
output = @options[:output] = @args.shift
raise "Error: --from required when using --recursive." unless @options[:from]
raise "Error: --to required when using --recursive." unless @options[:to]
raise "Error: '#{@options[:input]}' is not a directory" unless File.directory?(@options[:input])
if @options[:output] && File.exists?(@options[:output]) && !File.directory?(@options[:output])
raise "Error: '#{@options[:output]}' is not a directory"
end
@options[:output] ||= @options[:input]
from = @options[:from]
if @options[:to] == @options[:from] && !@options[:in_place]
fmt = @options[:from]
raise "Error: converting from #{fmt} to #{fmt} without --in-place"
end
ext = @options[:from]
::Sass::Util.glob("#{@options[:input]}/**/*.#{ext}") do |f|
output =
if @options[:in_place]
f
elsif @options[:output]
output_name = f.gsub(/\.(c|sa|sc|le)ss$/, ".#{@options[:to]}")
output_name[0...@options[:input].size] = @options[:output]
output_name
else
f.gsub(/\.(c|sa|sc|le)ss$/, ".#{@options[:to]}")
end
unless File.directory?(File.dirname(output))
puts_action :directory, :green, File.dirname(output)
FileUtils.mkdir_p(File.dirname(output))
end
puts_action :convert, :green, f
if File.exists?(output)
puts_action :overwrite, :yellow, output
else
puts_action :create, :green, output
end
input = open_file(f)
output = @options[:in_place] ? input : open_file(output, "w")
process_file(input, output)
end
end
def process_file(input, output)
if input.is_a?(File)
@options[:from] ||=
case input.path
when /\.scss$/; :scss
when /\.sass$/; :sass
when /\.less$/; :less
when /\.css$/; :css
end
elsif @options[:in_place]
raise "Error: the --in-place option requires a filename."
end
if output.is_a?(File)
@options[:to] ||=
case output.path
when /\.scss$/; :scss
when /\.sass$/; :sass
end
end
@options[:from] ||= :css
@options[:to] ||= :sass
@options[:for_engine][:syntax] = @options[:from]
out =
::Sass::Util.silence_sass_warnings do
if @options[:from] == :css
require 'sass/css'
::Sass::CSS.new(input.read, @options[:for_tree]).render(@options[:to])
elsif @options[:from] == :less
require 'sass/less'
try_less_note
input = input.read if input.is_a?(IO) && !input.is_a?(File) # Less is dumb
Less::Engine.new(input).to_tree.to_sass_tree.send("to_#{@options[:to]}", @options[:for_tree])
else
if input.is_a?(File)
::Sass::Engine.for_file(input.path, @options[:for_engine])
else
::Sass::Engine.new(input.read, @options[:for_engine])
end.to_tree.send("to_#{@options[:to]}", @options[:for_tree])
end
end
output = File.open(input.path, 'w') if @options[:in_place]
output.write(out)
rescue ::Sass::SyntaxError => e
raise e if @options[:trace]
file = " of #{e.sass_filename}" if e.sass_filename
raise "Error on line #{e.sass_line}#{file}: #{e.message}\n Use --trace for backtrace"
rescue LoadError => err
handle_load_error(err)
end
@@less_note_printed = false
def try_less_note
return if @@less_note_printed
@@less_note_printed = true
warn <<NOTE
* NOTE: Sass and Less are different languages, and they work differently.
* I'll do my best to translate, but some features -- especially mixins --
* should be checked by hand.
NOTE
end
end
end
end