40 lines
1.3 KiB
Markdown
40 lines
1.3 KiB
Markdown
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---
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title: "Ruby version and gemset in your Bash prompt? Yes sir!"
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kind: article
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slug: ruby-version-and-gemset-in-your-bash-prompt-yes-sir
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created_at: 2010-04-25
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tags:
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- Ruby
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- BASH
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- rvm
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- gemset
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- profile
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---
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RVM is an easy way to switch between different ruby implementations and gemsets. If you don't know about it, [go check it out][1]. If you do know about, you'll know how annoying it is never to know which ruby version and gemset you're currently using. Here is a nice `.profile` hack that shows your current ruby version and optional gemset in your prompt.
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[1]: http://rvm.beginrescueend.com/
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~
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Firstly, add the following function to your `~/.profile`:
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function rvm_version {
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local gemset=$(echo $GEM_HOME | awk -F'@' '{print $2}')
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[ "$gemset" != "" ] && gemset="@$gemset"
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local version=$(echo $MY_RUBY_HOME | awk -F'-' '{print $2}')
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[ "$version" != "" ] && version="@$version"
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local full="$version$gemset"
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[ "$full" != "" ] && echo "$full "
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}
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Next, you can use this function in your prompt. Like this:
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export PS1="\$(rvm_version) \w \$(parse_git_branch) \$ "
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The results? For standard ruby 1.8.7
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@1.8.7 ~ $
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Or with the `rails3` gemset enabled:
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@1.8.7@rails3 ~ $
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So, now you always know which ruby you're using! Happy coding!
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