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require 'thread'
# Guard is the main module for all Guard related modules and classes.
# Also other Guard implementation should use this namespace.
#
module Guard
autoload :UI, 'guard/ui'
autoload :Dsl, 'guard/dsl'
autoload :DslDescriber, 'guard/dsl_describer'
autoload :Group, 'guard/group'
autoload :Interactor, 'guard/interactor'
autoload :Listener, 'guard/listener'
autoload :Watcher, 'guard/watcher'
autoload :Notifier, 'guard/notifier'
autoload :Hook, 'guard/hook'
# The Guardfile template for `guard init`
GUARDFILE_TEMPLATE = File.expand_path('../guard/templates/Guardfile', __FILE__)
class << self
attr_accessor :options, :interactor, :listener, :lock
# Creates the initial Guardfile template or add a Guard implementation
# Guardfile template to an existing Guardfile.
#
# @see Guard::Guard.init
#
# @param [String] guard_name the name of the Guard to initialize
#
def initialize_template(guard_name = nil)
if !File.exist?('Guardfile')
::Guard::UI.info "Writing new Guardfile to #{ Dir.pwd }/Guardfile"
FileUtils.cp(GUARDFILE_TEMPLATE, 'Guardfile')
elsif guard_name.nil?
::Guard::UI.error "Guardfile already exists at #{ Dir.pwd }/Guardfile"
exit 1
end
if guard_name
guard_class = ::Guard.get_guard_class(guard_name)
guard_class.init(guard_name)
end
end
# Initialize the Guard singleton.
#
# @option options [Boolean] clear if auto clear the UI should be done
# @option options [Boolean] notify if system notifications should be shown
# @option options [Boolean] debug if debug output should be shown
# @option options [Array<String>] group the list of groups to start
# @option options [String] watchdir the director to watch
# @option options [String] guardfile the path to the Guardfile
# @option options [Boolean] watch_all_modifications watches all file modifications if true
#
def setup(options = {})
@lock = Mutex.new
@options = options
@guards = []
self.reset_groups
@interactor = Interactor.new unless options[:no_interactions]
@listener = Listener.select_and_init(options[:watchdir] && File.expand_path(options[:watchdir]), options)
@options[:notify] && ENV['GUARD_NOTIFY'] != 'false' ? Notifier.turn_on : Notifier.turn_off
UI.clear if @options[:clear]
debug_command_execution if @options[:debug]
self
end
# Smart accessor for retrieving a specific guard or several guards at once.
#
# @param [String, Symbol] filter return the guard with the given name, or nil if not found
# @param [Regexp] filter returns all guards matching the Regexp, or [] if no guard found
# @param [Hash] filter returns all guards matching the given Hash.
# Example: `{ :name => 'rspec', :group => 'backend' }`, or [] if no guard found
# @param [NilClass] filter returns all guards
#
# @see Guard.groups
#
def guards(filter = nil)
case filter
when String, Symbol
@guards.find { |guard| guard.class.to_s.downcase.sub('guard::', '') == filter.to_s.downcase.gsub('-', '') }
when Regexp
@guards.find_all { |guard| guard.class.to_s.downcase.sub('guard::', '') =~ filter }
when Hash
filter.inject(@guards) do |matches, (k, v)|
if k.to_sym == :name
matches.find_all { |guard| guard.class.to_s.downcase.sub('guard::', '') == v.to_s.downcase.gsub('-', '') }
else
matches.find_all { |guard| guard.send(k).to_sym == v.to_sym }
end
end
else
@guards
end
end
# Smart accessor for retrieving a specific group or several groups at once.
#
# @param [NilClass] filter returns all groups
# @param [String, Symbol] filter return the group with the given name, or nil if not found
# @param [Regexp] filter returns all groups matching the Regexp, or [] if no group found
#
# @see Guard.guards
#
def groups(filter = nil)
case filter
when String, Symbol
@groups.find { |group| group.name == filter.to_sym }
when Regexp
@groups.find_all { |group| group.name.to_s =~ filter }
else
@groups
end
end
# Initialize the groups array with the `:default` group.
#
# @see Guard.groups
#
def reset_groups
@groups = [Group.new(:default)]
end
# Start Guard by evaluate the `Guardfile`, initialize the declared Guards
# and start the available file change listener.
#
# @option options [Boolean] clear if auto clear the UI should be done
# @option options [Boolean] notify if system notifications should be shown
# @option options [Boolean] debug if debug output should be shown
# @option options [Array<String>] group the list of groups to start
# @option options [String] watchdir the director to watch
# @option options [String] guardfile the path to the Guardfile
#
def start(options = {})
setup(options)
Dsl.evaluate_guardfile(options)
listener.on_change do |files|
Dsl.reevaluate_guardfile if Watcher.match_guardfile?(files)
listener.changed_files += files if Watcher.match_files?(guards, files)
end
UI.info "Guard is now watching at '#{ listener.directory }'"
run_on_guards do |guard|
run_supervised_task(guard, :start)
end
interactor.start if interactor
listener.start
end
# Stop Guard listening to file changes
#
def stop
UI.info 'Bye bye...', :reset => true
run_on_guards do |guard|
run_supervised_task(guard, :stop)
end
listener.stop
abort
end
# Reload all Guards currently enabled.
#
# @param [Hash] An hash with a guard or a group scope
#
def reload(scopes)
run do
run_on_guards(scopes) do |guard|
run_supervised_task(guard, :reload)
end
end
end
# Trigger `run_all` on all Guards currently enabled.
#
# @param [Hash] An hash with a guard or a group scope
#
def run_all(scopes)
run do
run_on_guards(scopes) do |guard|
run_supervised_task(guard, :run_all)
end
end
end
# Pause Guard listening to file changes.
#
def pause
if listener.paused?
UI.info 'Un-paused files modification listening', :reset => true
listener.clear_changed_files
listener.run
else
UI.info 'Paused files modification listening', :reset => true
listener.pause
end
end
# Trigger `run_on_change` on all Guards currently enabled.
#
def run_on_change(files)
run do
run_on_guards do |guard|
run_on_change_task(files, guard)
end
end
end
# Run a block where the listener and the interactor is
# blocked.
#
# @yield the block to run
#
def run
UI.clear if options[:clear]
lock.synchronize do
begin
interactor.stop if interactor
yield
rescue Interrupt
end
interactor.start if interactor
end
end
# Loop through all groups and run the given task (as block) for each Guard.
#
# Stop the task run for the all Guards within a group if one Guard
# throws `:task_has_failed`.
#
# @param [Hash] An hash with a guard or a group scope
#
def run_on_guards(scopes = {})
if guard = scopes[:guard]
yield(guard)
else
groups = scopes[:group] ? [scopes[:group]] : @groups
groups.each do |group|
catch :task_has_failed do
guards(:group => group.name).each do |guard|
yield(guard)
end
end
end
end
end
# Run the `:run_on_change` task. When the option `:watch_all_modifications` is set,
# the task is split to run changed paths on {Guard::Guard#run_on_change}, whereas
# deleted paths run on {Guard::Guard#run_on_deletion}.
#
# @param [Array<String>] files the list of files to pass to the task
# @param [Guard::Guard] guard the guard to run
# @raise [:task_has_failed] when task has failed
#
def run_on_change_task(files, guard)
paths = Watcher.match_files(guard, files)
changes = changed_paths(paths)
deletions = deleted_paths(paths)
unless changes.empty?
UI.debug "#{ guard.class.name }#run_on_change with #{ changes.inspect }"
run_supervised_task(guard, :run_on_change, changes)
end
unless deletions.empty?
UI.debug "#{ guard.class.name }#run_on_deletion with #{ deletions.inspect }"
run_supervised_task(guard, :run_on_deletion, deletions)
end
end
# Detects the paths that have changed.
#
# Deleted paths are prefixed by an exclamation point.
# @see Guard::Listener#modified_files
#
# @param [Array<String>] paths the watched paths
# @return [Array<String>] the changed paths
#
def changed_paths(paths)
paths.select { |f| !f.respond_to?(:start_with?) || !f.start_with?('!') }
end
# Detects the paths that have been deleted.
#
# Deleted paths are prefixed by an exclamation point.
# @see Guard::Listener#modified_files
#
# @param [Array<String>] paths the watched paths
# @return [Array<String>] the deleted paths
#
def deleted_paths(paths)
paths.select { |f| f.respond_to?(:start_with?) && f.start_with?('!') }.map { |f| f.slice(1..-1) }
end
# Run a Guard task, but remove the Guard when his work leads to a system failure.
#
# When the Group has `:halt_on_fail` disabled, we've to catch `:task_has_failed`
# here in order to avoid an uncaught throw error.
#
# @param [Guard::Guard] guard the Guard to execute
# @param [Symbol] task the task to run
# @param [Array] args the arguments for the task
# @raise [:task_has_failed] when task has failed
#
def run_supervised_task(guard, task, *args)
catch guard_symbol(guard) do
guard.hook("#{ task }_begin", *args)
result = guard.send(task, *args)
guard.hook("#{ task }_end", result)
result
end
rescue Exception => ex
UI.error("#{ guard.class.name } failed to achieve its <#{ task.to_s }>, exception was:" +
"\n#{ ex.class }: #{ ex.message }\n#{ ex.backtrace.join("\n") }")
guards.delete guard
UI.info("\n#{ guard.class.name } has just been fired")
ex
end
# Get the symbol we have to catch when running a supervised task.
# If we are within a Guard group that has the `:halt_on_fail`
# option set, we do NOT catch it here, it will be catched at the
# group level.
#
# @see .run_on_guards
#
# @param [Guard::Guard] guard the Guard to execute
# @return [Symbol] the symbol to catch
#
def guard_symbol(guard)
if guard.group.class == Symbol
group = groups(guard.group)
group.options[:halt_on_fail] ? :no_catch : :task_has_failed
else
:task_has_failed
end
end
# Add a Guard to use.
#
# @param [String] name the Guard name
# @param [Array<Watcher>] watchers the list of declared watchers
# @param [Array<Hash>] callbacks the list of callbacks
# @param [Hash] options the Guard options (see the given Guard documentation)
# @return [Guard::Guard] the guard added
#
def add_guard(name, watchers = [], callbacks = [], options = {})
if name.to_sym == :ego
UI.deprecation('Guard::Ego is now part of Guard. You can remove it from your Guardfile.')
else
guard_class = get_guard_class(name)
callbacks.each { |callback| Hook.add_callback(callback[:listener], guard_class, callback[:events]) }
guard = guard_class.new(watchers, options)
@guards << guard
guard
end
end
# Add a Guard group.
#
# @param [String] name the group name
# @option options [Boolean] halt_on_fail if a task execution
# should be halted for all Guards in this group if one Guard throws `:task_has_failed`
# @return [Guard::Group] the group added (or retrieved from the `@groups` variable if already present)
#
def add_group(name, options = {})
group = groups(name)
if group.nil?
group = Group.new(name, options)
@groups << group
end
group
end
# Tries to load the Guard main class.
#
# @param [String] name the name of the Guard
# @return [Class, nil] the loaded class
#
def get_guard_class(name)
name = name.to_s
try_require = false
const_name = name.downcase.gsub('-', '')
begin
require "guard/#{ name.downcase }" if try_require
self.const_get(self.constants.find { |c| c.to_s.downcase == const_name })
rescue TypeError
unless try_require
try_require = true
retry
else
UI.error "Could not find class Guard::#{ const_name.capitalize }"
end
rescue LoadError => loadError
UI.error "Could not load 'guard/#{ name.downcase }' or find class Guard::#{ const_name.capitalize }"
UI.error loadError.to_s
end
end
# Locate a path to a Guard gem.
#
# @param [String] name the name of the Guard without the prefix `guard-`
# @return [String] the full path to the Guard gem
#
def locate_guard(name)
if Gem::Version.create(Gem::VERSION) >= Gem::Version.create('1.8.0')
Gem::Specification.find_by_name("guard-#{ name }").full_gem_path
else
Gem.source_index.find_name("guard-#{ name }").last.full_gem_path
end
rescue
UI.error "Could not find 'guard-#{ name }' gem path."
end
# Returns a list of guard Gem names installed locally.
#
# @return [Array<String>] a list of guard gem names
#
def guard_gem_names
if Gem::Version.create(Gem::VERSION) >= Gem::Version.create('1.8.0')
Gem::Specification.find_all.select { |x| x.name =~ /^guard-/ }
else
Gem.source_index.find_name(/^guard-/)
end.map { |x| x.name.sub /^guard-/, '' }
end
# Adds a command logger in debug mode. This wraps common command
# execution functions and logs the executed command before execution.
#
def debug_command_execution
Kernel.send(:alias_method, :original_system, :system)
Kernel.send(:define_method, :system) do |command, *args|
::Guard::UI.debug "Command execution: #{ command } #{ args.join(' ') }"
original_system command, *args
end
Kernel.send(:alias_method, :original_backtick, :'`')
Kernel.send(:define_method, :'`') do |command|
::Guard::UI.debug "Command execution: #{ command }"
original_backtick command
end
end
end
end
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