add zsh

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diff --git a/oh-my-zsh/plugins/rvm/README.md b/oh-my-zsh/plugins/rvm/README.md
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+# Ruby Version Manager plugin
+
+This plugin adds some utility functions and completions for [Ruby Version Manager](https://rvm.io/).
+
+To use it, add `rvm` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... rvm)
+```
+
+## Aliases
+
+| Alias        | Command              |
+| ------------ | -------------------- |
+| `rb18`       | `rvm use ruby-1.8.7` |
+| `rb19`       | `rvm use ruby-1.9.3` |
+| `rb20`       | `rvm use ruby-2.0.0` |
+| `rb21`       | `rvm use ruby-2.1`   |
+| `rb22`       | `rvm use ruby-2.2`   |
+| `rb23`       | `rvm use ruby-2.3`   |
+| `rb24`       | `rvm use ruby-2.4`   |
+| `rb25`       | `rvm use ruby-2.5`   |
+| `rb26`       | `rvm use ruby-2.6`   |
+| `rb27`       | `rvm use ruby-2.7`   |
+| `rb30`       | `rvm use ruby-3.0`   |
+| `rb31`       | `rvm use ruby-3.1`   |
+| `rvm-update` | `rvm get head`       |
+| `gems`       | `gem list`           |
+| `rvms`       | `rvm gemset`         |
+
+## Deprecated versions
+
+At the time of writing this (2021-12-28), Ruby versions until 2.5 are [EOL][1],
+and will be removed in the future.
+
+[1]: https://endoflife.date/ruby
diff --git a/oh-my-zsh/plugins/rvm/rvm.plugin.zsh b/oh-my-zsh/plugins/rvm/rvm.plugin.zsh
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+++ b/oh-my-zsh/plugins/rvm/rvm.plugin.zsh
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+# Completion
+fpath+=("${rvm_path}/scripts/zsh/Completion")
+
+typeset -g -A _comps
+autoload -Uz _rvm
+_comps[rvm]=_rvm
+
+# Aliases
+alias rubies='rvm list rubies'
+alias rvms='rvm gemset'
+alias gemsets='rvms list'
+
+
+# rb{version} utilities
+# From `rvm list known`
+typeset -A rubies
+rubies=(
+  18  'ruby-1.8.7'
+  19  'ruby-1.9.3'
+  20  'ruby-2.0.0'
+  21  'ruby-2.1'
+  22  'ruby-2.2'
+  23  'ruby-2.3'
+  24  'ruby-2.4'
+  25  'ruby-2.5'
+  26  'ruby-2.6'
+  27  'ruby-2.7'
+  30  'ruby-3.0'
+  31  'ruby-3.1'
+)
+
+for v in ${(k)rubies}; do
+  version="${rubies[$v]}"
+  functions[rb${v}]="rvm use ${version}\${1+"@\$1"}"
+  functions[_rb${v}]="compadd \$(ls -1 \"\${rvm_path}/gems\" | grep '^${version}@' | sed -e 's/^${version}@//' | awk '{print $1}')"
+  compdef _rb$v rb$v
+done
+unset rubies v version
+
+
+function rvm-update {
+  rvm get head
+}
+
+# TODO: Make this usable w/o rvm.
+function gems {
+  local current_ruby=`rvm-prompt i v p`
+  local current_gemset=`rvm-prompt g`
+
+  gem list $@ | sed -E \
+    -e "s/\([0-9, \.]+( .+)?\)/$fg[blue]&$reset_color/g" \
+    -e "s|$(echo $rvm_path)|$fg[magenta]\$rvm_path$reset_color|g" \
+    -e "s/$current_ruby@global/$fg[yellow]&$reset_color/g" \
+    -e "s/$current_ruby$current_gemset$/$fg[green]&$reset_color/g"
+}