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Guard [![Build Status ](http://travis-ci.org/guard/guard.png )](http://travis-ci.org/guard/guard)
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=====
Guard is a command line tool that easily handle events on files modifications.
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If you have any questions please join us on our [Google group ](http://groups.google.com/group/guard-dev ) or on `#guard` (irc.freenode.net).
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Features
--------
* [FSEvent ](http://en.wikipedia.org/wiki/FSEvents ) support on Mac OS X 10.5+ (without RubyCocoa!, [rb-fsevent gem, >= 0.3.5 ](https://rubygems.org/gems/rb-fsevent ) required).
* [Inotify ](http://en.wikipedia.org/wiki/Inotify ) support on Linux ([rb-inotify gem, >= 0.5.1](https://rubygems.org/gems/rb-inotify) required).
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* [Directory Change Notification ](http://msdn.microsoft.com/en-us/library/aa365261\(VS.85\ ).aspx) support on Windows ([rb-fchange, >= 0.0.2](https://rubygems.org/gems/rb-fchange) required).
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* Polling on the other operating systems (help us to support more OS).
* Automatic & Super fast (when polling is not used) files modifications detection (even new files are detected).
* Growl notifications ([growlnotify](http://growl.info/documentation/growlnotify.php) & [growl gem ](https://rubygems.org/gems/growl ) required).
* Libnotify notifications ([libnotify gem](https://rubygems.org/gems/libnotify) required).
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* Tested on Ruby 1.8.7, 1.9.2 && ree.
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Install
-------
Install the gem:
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``` bash
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$ gem install guard
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```
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Add it to your Gemfile (inside the `development` group):
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``` ruby
gem 'guard'
```
Generate an empty Guardfile with:
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``` bash
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$ guard init
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```
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You may optionally place a .Guardfile in your home directory to use it across multiple projects.
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Add the guards you need to your Guardfile (see the existing guards below).
### On Mac OS X
Install the rb-fsevent gem for [FSEvent ](http://en.wikipedia.org/wiki/FSEvents ) support:
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``` bash
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$ gem install rb-fsevent
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```
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Install the Growl gem if you want notification support:
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``` bash
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$ gem install growl
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```
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And add them to your Gemfile:
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``` ruby
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gem 'rb-fsevent'
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gem 'growl'
```
### On Linux
Install the rb-inotify gem for [inotify ](http://en.wikipedia.org/wiki/Inotify ) support:
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``` bash
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$ gem install rb-inotify
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```
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Install the Libnotify gem if you want notification support:
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``` bash
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$ gem install libnotify
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```
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And add them to your Gemfile:
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``` ruby
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gem 'rb-inotify'
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gem 'libnotify'
```
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### On Windows
Install the rb-fchange gem for [Directory Change Notification ](http://msdn.microsoft.com/en-us/library/aa365261\(VS.85\ ).aspx) support:
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``` bash
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$ gem install rb-fchange
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```
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Install the Notifu gem if you want notification support:
``` bash
$ gem install rb-notifu
```
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And add them to your Gemfile:
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``` ruby
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gem 'rb-fchange'
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gem 'rb-notifu'
```
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Usage
-----
Just launch Guard inside your Ruby / Rails project with:
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``` bash
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$ guard [start]
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```
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or if you use Bundler, to run the Guard executable specific to your bundle:
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``` bash
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$ bundle exec guard [start]
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```
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Guard will look for a Guardfile in your current directory. If it does not find one, it will look in your `$HOME` directory for a .Guardfile.
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Command line options
--------------------
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### `--clear` option
Shell can be cleared after each change:
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``` bash
$ guard --clear
$ guard -c # shortcut
```
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### `--notify` option
Notifications (growl/libnotify) can be disabled:
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``` bash
$ guard --notify false
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$ guard -n f # shortcut
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```
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Notifications can also be disabled globally by setting a `GUARD_NOTIFY` environment variable to `false`
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### `--group` option
Only certain guards groups can be run (see the Guardfile DSL below for creating groups):
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``` bash
$ guard --group group_name another_group_name
$ guard -g group_name another_group_name # shortcut
```
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### `--debug` option
Guard can be run in debug mode:
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``` bash
$ guard --debug
$ guard -d # shortcut
```
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### `--dry-run` option
Do a dry run without executing actions:
``` bash
$ guard --dry-run
$ guard -y # shortcut
```
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An exhaustive list of options is available with:
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``` bash
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$ guard help [TASK]
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```
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Signal handlers
---------------
Signal handlers are used to interact with Guard:
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* `Ctrl-C` - Calls each guard's `#stop` method, in the same order they are declared in the Guardfile, and then quits Guard itself.
* `Ctrl-\` - Calls each guard's `#run_all` method, in the same order they are declared in the Guardfile.
* `Ctrl-Z` - Calls each guard's `#reload` method, in the same order they are declared in the Guardfile.
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You can read more about [configure the signal keyboard shortcuts ](https://github.com/guard/guard/wiki/Configure-keyboard-shortcuts ) in the wiki.
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Available Guards
----------------
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A list of the available guards is present [in the wiki ](https://github.com/guard/guard/wiki/List-of-available-Guards ).
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### Add a guard to your Guardfile
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Add it to your Gemfile (inside the `development` group):
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``` ruby
gem '< guard-name > '
```
Insert default guard's definition to your Guardfile by running this command:
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``` bash
$ guard init < guard-name >
```
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You are good to go, or you can modify your guards' definition to suit your needs.
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Guardfile DSL
-------------
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The Guardfile DSL consists of just three simple methods: `#guard` , `#watch` & `#group` .
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Required:
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* The `#guard` method allows you to add a guard with an optional hash of options.
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Optional:
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* The `#watch` method allows you to define which files are supervised by this guard. An optional block can be added to overwrite the paths sent to the guard's `#run_on_change` method or to launch any arbitrary command.
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* The `#group` method allows you to group several guards together. Groups to be run can be specified with the Guard DSL option `--group` (or `-g` ). This comes in handy especially when you have a huge Guardfile and want to focus your development on a certain part.
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Example:
``` ruby
group 'backend' do
guard 'bundler' do
watch('Gemfile')
end
guard 'rspec', :cli => '--color --format doc' do
# Regexp watch patterns are matched with Regexp#match
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watch(%r{^spec/.+_spec\.rb$})
watch(%r{^lib/(.+)\.rb$}) { |m| "spec/lib/#{m[1]}_spec.rb" }
watch(%r{^spec/models/.+\.rb$}) { ["spec/models", "spec/acceptance"] }
watch(%r{^spec/.+\.rb$}) { `say hello` }
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# String watch patterns are matched with simple '=='
watch('spec/spec_helper.rb') { "spec" }
end
end
group 'frontend' do
guard 'coffeescript', :output => 'public/javascripts/compiled' do
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watch(%r{^app/coffeescripts/.+\.coffee$})
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end
guard 'livereload' do
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watch(%r{^app/.+\.(erb|haml)$})
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end
end
```
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### Using a Guardfile without the `guard` binary
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The Guardfile DSL can also be used in a programmatic fashion by calling directly `Guard::Dsl.evaluate_guardfile` .
Available options are as follow:
* `:guardfile` - The path to a valid Guardfile.
* `:guardfile_contents` - A string representing the content of a valid Guardfile
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Remember, without any options given, Guard will look for a Guardfile in your current directory and if it does not find one, it will look for it in your `$HOME` directory.
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For instance, you could use it as follow:
``` ruby
gem 'guard'
require 'guard'
Guard.setup
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Guard::Dsl.evaluate_guardfile(:guardfile => '/your/custom/path/to/a/valid/Guardfile')
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# or
Guard::Dsl.evaluate_guardfile(:guardfile_contents => "
guard 'rspec' do
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watch(%r{^spec/.+_spec\.rb$})
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end
")
```
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### Listing defined guards/groups for the current project
You can list the defined groups and guards for the current Guardfile from the command line using `guard show` or `guard -T` :
``` bash
# guard -T
(global):
shell
Group backend:
bundler
rspec: cli => "--color --format doc'
Group frontend:
coffeescript: output => "public/javascripts/compiled"
livereload
```
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Create a new guard
------------------
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Creating a new guard is very easy, just create a new gem (`bundle gem` if you use Bundler) with this basic structure:
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```
.travis.yml # bonus point!
CHANGELOG.md # bonus point!
Gemfile
guard-name.gemspec
Guardfile
lib/
guard/
guard-name/
templates/
Guardfile # needed for `guard init <guard-name>`
version.rb
guard-name.rb
test/ # or spec/
README.md
```
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`Guard::GuardName` (in `lib/guard/guard-name.rb` ) must inherit from `Guard::Guard` and should overwrite at least one of the five basic `Guard::Guard` instance methods.
Here is an example scaffold for `lib/guard/guard-name.rb` :
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``` ruby
require 'guard'
require 'guard/guard'
module Guard
class GuardName < Guard
def initialize(watchers=[], options={})
super
# init stuff here, thx!
end
# =================
# = Guard methods =
# =================
# If one of those methods raise an exception, the Guard::GuardName instance
# will be removed from the active guards.
# Called once when Guard starts
# Please override initialize method to init stuff
def start
true
end
# Called on Ctrl-C signal (when Guard quits)
def stop
true
end
# Called on Ctrl-Z signal
# This method should be mainly used for "reload" (really!) actions like reloading passenger/spork/bundler/...
def reload
true
end
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# Called on Ctrl-\ signal
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# This method should be principally used for long action like running all specs/tests/...
def run_all
true
end
# Called on file(s) modifications
def run_on_change(paths)
true
end
end
end
```
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Please take a look at the [existing guards' source code ](https://github.com/guard/guard/wiki/List-of-available-Guards ) for more concrete example and inspiration.
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Alternatively, a new guard can be added inline to a Guardfile with this basic structure:
``` ruby
require 'guard/guard'
module ::Guard
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class InlineGuard < ::Guard::Guard
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def run_all
true
end
def run_on_change(paths)
true
end
end
end
```
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Here is a very cool example by [@avdi ](https://github.com/avdi ) : http://avdi.org/devblog/2011/06/15/a-guardfile-for-redis
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Development
-----------
* Source hosted at [GitHub ](https://github.com/guard/guard ).
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* Report issues and feature requests to [GitHub Issues ](https://github.com/guard/guard/issues ).
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Pull requests are very welcome! Make sure your patches are well tested. Please create a topic branch for every separate change you make. Please **do not change** the version in your pull-request.
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For questions please join us on our [Google group ](http://groups.google.com/group/guard-dev ) or on `#guard` (irc.freenode.net).
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Author
------
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[Thibaud Guillaume-Gentil ](https://github.com/thibaudgg )
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Contributors
------
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https://github.com/guard/guard/contributors