146 lines
3.5 KiB
Ruby
146 lines
3.5 KiB
Ruby
require 'rbconfig'
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require 'digest/sha1'
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module Guard
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autoload :Darwin, 'guard/listeners/darwin'
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autoload :Linux, 'guard/listeners/linux'
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autoload :Windows, 'guard/listeners/windows'
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autoload :Polling, 'guard/listeners/polling'
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class Listener
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attr_reader :directory
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def self.select_and_init(*a)
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if mac? && Darwin.usable?
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Darwin.new(*a)
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elsif linux? && Linux.usable?
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Linux.new(*a)
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elsif windows? && Windows.usable?
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Windows.new(*a)
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else
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UI.info "Using polling (Please help us to support your system better than that.)"
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Polling.new(*a)
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end
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end
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def initialize(directory=Dir.pwd, options={})
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@directory = directory.to_s
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@sha1_checksums_hash = {}
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@relativize_paths = options.fetch(:relativize_paths, true)
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update_last_event
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end
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def start
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watch(@directory)
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end
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def stop
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end
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def on_change(&callback)
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@callback = callback
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end
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def update_last_event
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@last_event = Time.now
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end
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def modified_files(dirs, options={})
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files = potentially_modified_files(dirs, options).select { |path| file_modified?(path) }
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update_last_event
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relativize_paths(files)
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end
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def worker
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raise NotImplementedError, "should respond to #watch"
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end
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# register a directory to watch. must be implemented by the subclasses
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def watch(directory)
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raise NotImplementedError, "do whatever you want here, given the directory as only argument"
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end
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def all_files
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potentially_modified_files([@directory], :all => true)
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end
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# scopes all given paths to the current #directory
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def relativize_paths(paths)
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return paths unless relativize_paths?
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paths.map do |path|
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path.gsub(%r{^#{@directory}/}, '')
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end
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end
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def relativize_paths?
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!!@relativize_paths
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end
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private
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def potentially_modified_files(dirs, options={})
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paths = Dir.glob(dirs.map { |d| "#{d.sub(%r{/+$}, '')}/*" }, File::FNM_DOTMATCH).reject do |path|
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%w[. .. .bundle .git log tmp vendor].include?(File.basename(path))
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end
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if options[:all]
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paths.inject([]) do |array, path|
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if File.file?(path)
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array << path
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else
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array += Dir.glob("#{path}/**/*", File::FNM_DOTMATCH).select { |p| File.file?(p) }
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end
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array
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end
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else
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paths.select { |path| File.file?(path) }
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end
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end
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# Depending on the filesystem, mtime is probably only precise to the second, so round
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# both values down to the second for the comparison.
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def file_modified?(path)
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if File.mtime(path).to_i == @last_event.to_i
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file_content_modified?(path, sha1_checksum(path))
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elsif File.mtime(path).to_i > @last_event.to_i
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set_sha1_checksums_hash(path, sha1_checksum(path))
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true
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end
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rescue
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false
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end
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def file_content_modified?(path, sha1_checksum)
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if @sha1_checksums_hash[path] != sha1_checksum
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set_sha1_checksums_hash(path, sha1_checksum)
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true
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else
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false
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end
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end
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def set_sha1_checksums_hash(path, sha1_checksum)
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@sha1_checksums_hash[path] = sha1_checksum
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end
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def sha1_checksum(path)
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Digest::SHA1.file(path).to_s
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end
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def self.mac?
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RbConfig::CONFIG['target_os'] =~ /darwin/i
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end
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def self.linux?
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RbConfig::CONFIG['target_os'] =~ /linux/i
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end
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def self.windows?
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RbConfig::CONFIG['target_os'] =~ /mswin|mingw/i
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end
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end
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end
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