446 lines
11 KiB
Markdown
446 lines
11 KiB
Markdown
Guard [](http://travis-ci.org/guard/guard)
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=====
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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
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--------
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* [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).
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* [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).
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* Automatic & Super fast (when polling is not used) files modifications detection (even new files are detected).
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* Growl notifications ([growlnotify](http://growl.info/documentation/growlnotify.php) & [growl gem](https://rubygems.org/gems/growl) required).
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* Libnotify notifications ([libnotify gem](https://rubygems.org/gems/libnotify) required).
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* Tested against Ruby 1.8.7, 1.9.2 and REE.
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Screencast
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----------
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Ryan Bates made a screencast on Guard, you can view it here: http://railscasts.com/episodes/264-guard
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Install
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-------
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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
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gem 'guard'
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```
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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).
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### On Mac OS X
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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_notify gem if you want notification support:
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``` bash
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$ gem install growl_notify
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```
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And add it to your Gemfile:
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``` ruby
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gem 'rb-fsevent'
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gem 'growl_notify'
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```
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### On Linux
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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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```
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### On Windows
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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 win32console gem if you want colors in your terminal:
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``` bash
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$ gem install win32console
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```
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Install the Notifu gem if you want notification support:
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``` bash
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$ gem install rb-notifu
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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-fchange'
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gem 'rb-notifu'
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```
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Usage
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-----
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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 `$HOME` directory for a .Guardfile.
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Command line options
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--------------------
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### `-c`/`--clear` option
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Shell can be cleared after each change:
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``` bash
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$ guard --clear
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$ guard -c # shortcut
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```
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### `-n`/`--notify` option
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Notifications (growl/libnotify) can be disabled:
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``` bash
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$ 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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### `-g`/`--group` option
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Only certain guards groups can be run (see the Guardfile DSL below for creating groups):
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``` bash
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$ guard --group group_name another_group_name
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$ guard -g group_name another_group_name # shortcut
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```
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### `-d`/`--debug` option
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Guard can be run in debug mode:
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``` bash
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$ guard --debug
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$ guard -d # shortcut
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```
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### `-w`/`--watchdir` option
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Guard can watch in any directory (instead of the current directory):
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``` bash
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$ guard --watchdir ~/your/fancy/project
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$ guard -w ~/your/fancy/project # shortcut
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```
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### `-G`/`--guardfile` option
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Guard can use a Guardfile not located in the current directory:
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``` bash
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$ guard --guardfile ~/.your_global_guardfile
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$ guard -G ~/.your_global_guardfile # shortcut
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```
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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
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---------------
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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.
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* `Ctrl-\` - Calls each guard's `#run_all` method, in the same order they are declared in the Guardfile.
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* `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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----------------
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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
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gem '<guard-name>'
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```
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You can list all guards installed on your system with:
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``` bash
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$ guard list
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```
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Insert default guard's definition to your Guardfile by running this command:
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``` bash
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$ guard init <guard-name>
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```
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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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-------------
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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. Guards that don't belong to a group are considered global and are always run.
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Example:
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``` ruby
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group 'backend' do
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guard 'bundler' do
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watch('Gemfile')
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end
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guard 'rspec', :cli => '--color --format doc' do
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# Regexp watch patterns are matched with Regexp#match
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watch(%r{^spec/.+_spec\.rb$})
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watch(%r{^lib/(.+)\.rb$}) { |m| "spec/lib/#{m[1]}_spec.rb" }
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watch(%r{^spec/models/.+\.rb$}) { ["spec/models", "spec/acceptance"] }
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watch(%r{^spec/.+\.rb$}) { `say hello` }
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# String watch patterns are matched with simple '=='
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watch('spec/spec_helper.rb') { "spec" }
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end
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end
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group 'frontend' do
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guard 'coffeescript', :output => 'public/javascripts/compiled' do
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watch(%r{^app/coffeescripts/.+\.coffee$})
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end
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guard 'livereload' do
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watch(%r{^app/.+\.(erb|haml)$})
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end
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end
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```
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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`.
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Available options are as follow:
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* `:guardfile` - The path to a valid Guardfile.
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* `: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 `$HOME` directory.
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For instance, you could use it as follow:
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``` ruby
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gem 'guard'
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require 'guard'
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Guard.setup
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Guard::Dsl.evaluate_guardfile(:guardfile => '/your/custom/path/to/a/valid/Guardfile')
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# or
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Guard::Dsl.evaluate_guardfile(:guardfile_contents => "
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guard 'rspec' do
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watch(%r{^spec/.+_spec\.rb$})
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end
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")
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```
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### Listing defined guards/groups for the current project
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You can list the defined groups and guards for the current Guardfile from the command line using `guard show` or `guard -T`:
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``` bash
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# guard -T
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(global):
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shell
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Group backend:
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bundler
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rspec: cli => "--color --format doc"
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Group frontend:
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coffeescript: output => "public/javascripts/compiled"
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livereload
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```
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Create a new guard
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------------------
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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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```
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.travis.yml # bonus point!
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CHANGELOG.md # bonus point!
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Gemfile
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guard-name.gemspec
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Guardfile
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lib/
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guard/
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guard-name/
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templates/
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Guardfile # needed for `guard init <guard-name>`
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version.rb
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guard-name.rb
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test/ # or spec/
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README.md
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```
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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.
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Here is an example scaffold for `lib/guard/guard-name.rb`:
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``` ruby
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require 'guard'
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require 'guard/guard'
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module Guard
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class GuardName < Guard
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def initialize(watchers=[], options={})
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super
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# init stuff here, thx!
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end
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# =================
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# = Guard methods =
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# =================
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# If one of those methods raise an exception, the Guard::GuardName instance
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# will be removed from the active guards.
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# Called once when Guard starts
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# Please override initialize method to init stuff
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def start
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true
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end
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# Called on Ctrl-C signal (when Guard quits)
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def stop
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true
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end
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# Called on Ctrl-Z signal
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# This method should be mainly used for "reload" (really!) actions like reloading passenger/spork/bundler/...
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def reload
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true
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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/...
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def run_all
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true
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end
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# Called on file(s) modifications
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def run_on_change(paths)
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true
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end
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end
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end
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```
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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:
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``` ruby
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require 'guard/guard'
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module ::Guard
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class InlineGuard < ::Guard::Guard
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def run_all
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true
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end
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def run_on_change(paths)
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true
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end
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end
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end
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```
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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
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-----------
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* 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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------
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[Thibaud Guillaume-Gentil](https://github.com/thibaudgg)
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Contributors
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------
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https://github.com/guard/guard/contributors
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