class Sass::Exec::Base
The abstract base class for Sass
executables.
Constants
- COLORS
Public Class Methods
@param args [Array<String>] The command-line arguments
# File lib/sass/exec/base.rb, line 7 def initialize(args) @args = args @options = {} end
Public Instance Methods
Parses the command-line arguments and runs the executable. This does not handle exceptions or exit the program.
@see parse!
# File lib/sass/exec/base.rb, line 46 def parse @opts = OptionParser.new(&method(:set_opts)) @opts.parse!(@args) process_result @options end
Parses the command-line arguments and runs the executable. Calls ‘Kernel#exit` at the end, so it never returns.
@see parse
# File lib/sass/exec/base.rb, line 16 def parse! begin parse rescue Exception => e # Exit code 65 indicates invalid data per # http://www.freebsd.org/cgi/man.cgi?query=sysexits. Setting it via # at_exit is a bit of a hack, but it allows us to rethrow when --trace # is active and get both the built-in exception formatting and the # correct exit code. at_exit {exit Sass::Util.windows? ? 13 : 65} if e.is_a?(Sass::SyntaxError) raise e if @options[:trace] || e.is_a?(SystemExit) if e.is_a?(Sass::SyntaxError) $stderr.puts e.sass_backtrace_str("standard input") else $stderr.print "#{e.class}: " unless e.class == RuntimeError $stderr.puts e.message.to_s end $stderr.puts " Use --trace for backtrace." exit 1 end exit 0 end
@return [String] A description of the executable
# File lib/sass/exec/base.rb, line 56 def to_s @opts.to_s end
Protected Instance Methods
Wraps the given string in terminal escapes causing it to have the given color. If terminal escapes 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.
# File lib/sass/exec/base.rb, line 148 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? "\e[#{COLORS[color]}m#{str}\e[0m" end
Set an option for specifying ‘Encoding.default_external`.
@param opts [OptionParser]
# File lib/sass/exec/base.rb, line 90 def encoding_option(opts) encoding_desc = 'Specify the default encoding for input files.' opts.on('-E', '--default-encoding ENCODING', encoding_desc) do |encoding| Encoding.default_external = encoding end end
Finds the line of the source template on which an exception was raised.
@param exception [Exception] The exception @return [String] The line number
# File lib/sass/exec/base.rb, line 67 def get_line(exception) # SyntaxErrors have weird line reporting # when there's trailing whitespace if exception.is_a?(::SyntaxError) return (exception.message.scan(/:(\d+)/).first || ["??"]).first end (exception.backtrace[0].scan(/:(\d+)/).first || ["??"]).first end
Processes the options set by the command-line arguments. In particular, sets ‘@options` and `@options` to appropriate IO streams.
This is meant to be overridden by subclasses so they can run their respective programs.
# File lib/sass/exec/base.rb, line 102 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 @options[:output_filename] = args.shift output ||= @options[:output_filename] || $stdout @options[:input], @options[:output] = input, output end
Same as ‘Kernel.puts`, but doesn’t print anything if the ‘–quiet` option is set.
@param args [Array] Passed on to ‘Kernel.puts`
# File lib/sass/exec/base.rb, line 134 def puts(*args) return if @options[:for_engine][:quiet] Kernel.puts(*args) end
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`.
# File lib/sass/exec/base.rb, line 125 def puts_action(name, color, arg) return if @options[:for_engine][:quiet] printf color(color, "%11s %s\n"), name, arg STDOUT.flush 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]
# File lib/sass/exec/base.rb, line 83 def set_opts(opts) Sass::Util.abstract(this) end
# File lib/sass/exec/base.rb, line 158 def write_output(text, destination) if destination.is_a?(String) open_file(destination, 'w') {|file| file.write(text)} else destination.write(text) end end
Private Instance Methods
# File lib/sass/exec/base.rb, line 177 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
# File lib/sass/exec/base.rb, line 168 def open_file(filename, flag = 'r') return if filename.nil? flag = 'wb' if @options[:unix_newlines] && flag == 'w' file = File.open(filename, flag) return file unless block_given? yield file file.close end