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# Ruby
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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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When a Ruby version manager is not detected, local gems are installed in
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_`~/.gem`_; otherwise, they are installed according to the manager.
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## rbenv
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An alternative RVM is to use [_rbenv_][2], 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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This will be loaded automatically if _rbenv_ is installed to `$RBENV_ROOT`,
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_`~/.rbenv`_, or if the `rbenv` command is on the path.
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## rvm
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An alternative to the above is to use [The Ruby Version Manager (_rvm_)][3],
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which allows for managing multiple, isolated Ruby installations and gem sets in
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the home directory.
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Since RVM is loaded into the shell and is known to override shell commands, it
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may conflict with shell scripts.
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Load this module as late as possible when using RVM since RVM will complain if
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it is not first in `$PATH`.
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## chruby
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Yet another alternative is [_chruby_][4], 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 _`${ZDOTDIR:-$HOME}/.zpreztorc`_:
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```sh
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zstyle ':prezto:module:ruby:chruby' auto-switch 'yes'
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```
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## Bundler
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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][5].
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## Aliases
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Aliases are enabled by default. To disable them, add the following to
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_`${ZDOTDIR:-$HOME}/.zpreztorc`_.
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```sh
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zstyle ':prezto:module:ruby:alias' skip 'yes'
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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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- `rbbc` cleans up unused gems in your bundler directory.
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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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- `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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`$ruby_info` associative array.
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## Theming
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To display the name of the current Ruby version in a prompt, define the
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following style in the `prompt_name_setup` function.
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```sh
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# %v - ruby version.
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zstyle ':prezto:module:ruby:info:version' format 'version:%v'
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```
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Then add `$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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_The authors of this module should be contacted via the [issue tracker][6]._
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- [Sorin Ionescu](https://github.com/sorin-ionescu)
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[1]: https://www.ruby-lang.org
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[2]: https://github.com/rbenv/rbenv
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[3]: https://rvm.io
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[4]: https://github.com/postmodern/chruby
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[5]: https://gembundler.com
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[6]: https://github.com/sorin-ionescu/prezto/issues
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