class Guard::Watcher


enable processing the file system change result.
When a watcher matches a change, an optional action block is executed to
modifications.
The watcher defines a RegExp that will be matched against file system

def self.match_files(guard, files)

Returns:
  • (Array) - the matched watcher response
    Parameters:
    • files (Array) -- the changed files
    • guard (Guard::Plugin) -- the Guard plugin which watchers are used 
    def self.match_files(guard, files)
  return [] if files.empty?
  guard.watchers.inject([]) do |paths, watcher|
    files.each do |file|
      if matches = watcher.match(file)
        if watcher.action
          result = watcher.call_action(matches)
          if guard.options[:any_return]
            paths << result
          elsif result.respond_to?(:empty?) && !result.empty?
            paths << Array(result)
          end
        else
          paths << matches[0]
        end
      end
    end
    guard.options[:any_return] ? paths : paths.flatten.map { |p| p.to_s }
  end
end

    def self.match_files?(plugins, files)

    Returns:
    • (Boolean) - Whether a file matches

    Parameters:
    • files (Array) -- the files to test
    • plugins (Array) -- the Guard plugins to use the 
    def self.match_files?(plugins, files)
  plugins.any? do |plugin|
    plugin.watchers.any? do |watcher|
      files.any? { |file| watcher.match(file) }
    end
  end
end

    def self.match_guardfile?(files)

    Returns:
    • (Boolean) - whether one of these files is the Guardfile

    Parameters:
    • files (Array) -- the files to test 
    def self.match_guardfile?(files)
  files.any? { |file| File.expand_path(file) == ::Guard.evaluator.guardfile_path }
end

    def call_action(matches)

    Returns:
    • (String) - the final paths

    Parameters:
    • matches (String, MatchData) -- the matched path or the match from the 
    def call_action(matches)
  begin
    @action.arity > 0 ? @action.call(matches) : @action.call
  rescue Exception => e
    ::Guard::UI.error "Problem with watch action!\n#{ e.message }\n\n#{ e.backtrace.join("\n") }"
  end
end

    def initialize(pattern, action = nil)

    Parameters:
    • action (Block) -- the action to execute before passing the result to
    • pattern (String, Regexp) -- the pattern to be watched by the Guard 
    def initialize(pattern, action = nil)
  @pattern, @action = pattern, action
  @@warning_printed ||= false
  # deprecation warning
  if @pattern.is_a?(String) && @pattern =~ /(^(\^))|(>?(\\\.)|(\.\*))|(\(.*\))|(\[.*\])|(\$$)/
    unless @@warning_printed
      ::Guard::UI.info "*"*20 + "\nDEPRECATION WARNING!\n" + "*"*20
      ::Guard::UI.info <<-MSG
        You have a string in your Guardfile watch patterns that seem to represent a Regexp.
        Guard matches String with == and Regexp with Regexp#match.
        You should either use plain String (without Regexp special characters) or real Regexp.
      MSG
      @@warning_printed = true
    end
    ::Guard::UI.info "\"#{@pattern}\" has been converted to #{ Regexp.new(@pattern).inspect }\n"
    @pattern = Regexp.new(@pattern)
  end
end

    def match(file)

    Returns:
    • (Array) - an array of matches (or containing a single path

    Parameters:
    • file (String) -- the file to test 
    def match(file)
  f = file
  deleted = file.start_with?('!')
  f = deleted ? f[1..-1] : f
  if @pattern.is_a?(Regexp)
    if m = f.match(@pattern)
      m = m.to_a
      m[0] = file
      m
    end
  else
    f == @pattern ? [file] : nil
  end
end