Modos de Uso

Sass can be used in three ways:

  1. as a command-line tool,
  2. as a standalone Ruby module,
  3. and as a plugin for any Rack-enabled framework, including Ruby on Rails and Sinatra.
The first step for all of these is to install the Sass gem:

gem install sass

To run Sass from the command line, just use

sass input.scss output.css
You can also tell Sass to watch the file and update the CSS every time the Sass file changes:

sass --watch input.scss:output.css
If you have a directory with many Sass files, you can also tell Sass to watch the entire directory:

sass --watch app/sass:public/stylesheets
Use sass --help for full documentation.
[~/sinatra/sinatra-tictactoe/sinatra-tictactoe-ajax(master)]$ sass --help
Usage: sass [options] [INPUT] [OUTPUT]

Description:
  Converts SCSS or Sass files to CSS.

Options:
    -s, --stdin                      Read input from standard input instead of an input file
        --trace                      Show a full traceback on error
        --unix-newlines              Use Unix-style newlines in written files.
        --scss                       Use the CSS-superset SCSS syntax.
        --watch                      Watch files or directories for changes.
                                     The location of the generated CSS can be set using a colon:
                                       sass --watch input.sass:output.css
                                       sass --watch input-dir:output-dir
        --update                     Compile files or directories to CSS.
                                     Locations are set like --watch.
        --stop-on-error              If a file fails to compile, exit immediately.
                                     Only meaningful for --watch and --update.
        --poll                       Check for file changes manually, rather than relying on the OS.
                                     Only meaningful for --watch.
    -f, --force                      Recompile all Sass files, even if the CSS file is newer.
                                     Only meaningful for --update.
    -c, --check                      Just check syntax, don't evaluate.
    -t, --style NAME                 Output style. Can be nested (default), compact, compressed, or expanded.
        --precision NUMBER_OF_DIGITS How many digits of precision to use when outputting decimal numbers. Defaults to 3.
    -q, --quiet                      Silence warnings and status messages during compilation.
        --compass                    Make Compass imports available and load project configuration.
    -g, --debug-info                 Emit extra information in the generated CSS that can be used by the FireSass Firebug plugin.
    -l, --line-numbers               Emit comments in the generated CSS indicating the corresponding source line.
        --line-comments
    -i, --interactive                Run an interactive SassScript shell.
    -I, --load-path PATH             Add a sass import path.
    -r, --require LIB                Require a Ruby library before running Sass.
        --cache-location PATH        The path to put cached Sass files. Defaults to .sass-cache.
    -C, --no-cache                   Don't cache to sassc files.
    -E encoding                      Specify the default encoding for Sass files.
    -?, -h, --help                   Show this message
    -v, --version                    Print version

Using Sass in Ruby code is very simple. After installing the Sass gem, you can use it by running require "sass" and using Saas::Engine like so:

template = File.load('stylesheets/sassy.sass')
sass_engine = Sass::Engine.new(template)
output = sass_engine.render
puts output

Casiano Rodriguez León 2015-06-18