master/lib/guard/listener.rb

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