ブランチ切り替えに（やや）強いscssコマンド

scss

#!/usr/bin/env ruby
require 'sass'
require 'sass/exec'

require 'sass/plugin'
%w[
  updating_stylesheets
  not_updating_stylesheet

  creating_directory

  updating_stylesheet
  updated_stylesheet

  template_modified
  template_created
  template_deleted
].each do |cb|
  Sass::Plugin.send "on_#{cb}" do |*args|
    # イベント発生の調査用
    $stderr.puts "on_#{cb} (#{args.join(', ')})"
  end
end
Sass::Plugin.on_compilation_error do |error, template, css|
  puts error.class
  if error.instance_of? Errno::ENOENT
    exec "bundle exec ./scss --watch sass:css"
  end
end

opts = Sass::Exec::Sass.new(ARGV)
opts.parse!