feat(ruff): add ruff plugin

plugins/ruff/README.md

@@ -0,0 +1,23 @@
+# ruff plugin
+
+This plugin automatically installs [ruff](https://github.com/astral-sh/ruff)'s completions for you,
+and keeps them up to date. It also adds convenient aliases for common usage.
+
+To use it, add `ruff` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... ruff)
+```
+
+## Aliases
+
+| Alias | Command              | Description                                                  |
+| :---- | -------------------- | :----------------------------------------------------------- |
+| ruc   | `ruff check`         | Run Ruff linter on the given files or directories            |
+| rucf  | `ruff check --fix`   | Run Ruff linter and fix auto-fixable issues                  |
+| ruf   | `ruff format`        | Run the Ruff formatter on the given files or directories     |
+| rufc  | `ruff format --check`| Check if files are already formatted without making changes  |
+| rur   | `ruff rule`          | Explain a rule (or all rules)                                |
+| rul   | `ruff linter`        | List all supported upstream linters                          |
+| rucl  | `ruff clean`         | Clear any caches in the current directory and subdirectories |
+| ruup  | `ruff self update`   | Update Ruff to the latest version                            |

plugins/ruff/ruff.plugin.zsh

@@ -0,0 +1,24 @@
+# Return immediately if ruff is not found
+if (( ! ${+commands[ruff]} )); then
+  return
+fi
+
+alias ruc='ruff check'
+alias rucf='ruff check --fix'
+alias ruf='ruff format'
+alias rufc='ruff format --check'
+alias rur='ruff rule'
+alias rul='ruff linter'
+alias rucl='ruff clean'
+alias ruup='ruff self update'
+
+# If the completion file doesn't exist yet, we need to autoload it and
+# bind it. Otherwise, compinit will have already done that.
+if [[ ! -f "$ZSH_CACHE_DIR/completions/_ruff" ]]; then
+  typeset -g -A _comps
+  autoload -Uz _ruff
+  _comps[ruff]=_ruff
+fi
+
+# Overwrites the file each time as completions might change with ruff versions.
+ruff generate-shell-completion zsh >| "$ZSH_CACHE_DIR/completions/_ruff" &|