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Ruby
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====
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Configures [Ruby][1] local gem installation, loads version managers, and defines
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aliases.
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Local Gem Installation
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----------------------
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When a Ruby version manager is not detected, local gems are installed in
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*~/.gems*; otherwise, they are installed according to the manager.
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RVM
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---
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An alternative to the above is to use [The Ruby Version Manager (RVM)][2], which
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allows for managing multiple, isolated Ruby installations and gem sets in the
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home directory.
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Since RVM is loaded into the shell and is known to override shell commands, it
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may conflict with shell scripts. It may be best to load the ruby module last
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given that RVM needs to be injected into $PATH as the first element.
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rbenv
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-----
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An alternative RVM is to use [rbenv][3], which allows for switching between
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multiple, isolated Ruby installations in the home directory.
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While it is not as feature rich as RVM, it is not loaded into the shell and is
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not known to cause conflicts with shell scripts.
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chruby
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------
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Yet another alternative is [chruby][6], which is simpler than both RVM and
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rbenv.
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### Settings
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#### Auto-Switch
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To enable auto switching the Ruby version on directory change based on the
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.ruby-version file, add the following line to *zpreztorc*:
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zstyle ':prezto:module:ruby:chruby' auto-switch 'yes'
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Bundler
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-------
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Manage gems that are not meant to be used as commands, such as application
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dependencies, with [Bundler][4].
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Aliases
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-------
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### General
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- `rb` is short for `ruby`.
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### Bundler
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- `rbb` manages ruby dependencies (`bundle`).
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- `rbbe` executes a script in the context of the current bundle.
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- `rbbi` installs the gems specified in the *Gemfile* in *vendor/bundle*.
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- `rbbI` installs the following:
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- gems specified in the *Gemfile* in *vendor/bundle*.
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- packages the gems into *vendor/cache*.
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- appends bundler directories to *.gitignore*.
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- `rbbl` lists all gems in the current bundle.
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- `rbbo` opens an installed gem in the editor.
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- `rbbp` packages gem files into *vendor/cache*.
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- `rbbu` updates gems to their latest version.
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Functions
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---------
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- `ruby-app-root` displays the path to the Ruby application root directory.
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- `ruby-info` exposes information about the Ruby environment via the
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`$ruby_info` associative array.
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Theming
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-------
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To display the name of the current Ruby version in a prompt, define the
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following style in the `prompt_name_setup` function.
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# %v - ruby version.
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zstyle ':prezto:module:ruby:info:version' format 'version:%v'
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Then add `$ruby_info[version]` to `$PROMPT` or `$RPROMPT` and call
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`ruby-info` in the `prompt_name_preexec` hook function.
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Authors
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-------
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*The authors of this module should be contacted via the [issue tracker][5].*
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- [Sorin Ionescu](https://github.com/sorin-ionescu)
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[1]: http://www.ruby-lang.org
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[2]: https://rvm.io
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[3]: https://github.com/sstephenson/rbenv
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[4]: http://gembundler.com
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[5]: https://github.com/sorin-ionescu/prezto/issues
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[6]: https://github.com/postmodern/chruby
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