feat(brew): run `brew shellenv` command at plugin load (#10874)

plugins/brew/README.md

@@ -8,19 +8,23 @@ To use it, add `brew` to the plugins array of your zshrc file:
 plugins=(... brew)
 ```
 
+## Shellenv
+
+This plugin also executes `brew shellenv` at plugin load to set up many useful variables, such as `HOMEBREW_PREFIX` or `HOMEBREW_REPOSITORY`.
+
 ## Aliases
 
 | Alias    | Command                               | Description                                                         |
-|----------|---------------------------------------|---------------------------------------------------------------------|
+| -------- | ------------------------------------- | ------------------------------------------------------------------- |
+| `bcubc`  | `brew upgrade --cask && brew cleanup` | Update outdated casks, then run cleanup.                            |
+| `bcubo`  | `brew update && brew outdated --cask` | Update Homebrew data, then list outdated casks.                     |
 | `brewp`  | `brew pin`                            | Pin a specified formula so that it's not upgraded.                  |
 | `brews`  | `brew list -1`                        | List installed formulae or the installed files for a given formula. |
 | `brewsp` | `brew list --pinned`                  | List pinned formulae, or show the version of a given formula.       |
-| `bubo`   | `brew update && brew outdated`        | Update Homebrew data, then list outdated formulae and casks.        |
 | `bubc`   | `brew upgrade && brew cleanup`        | Upgrade outdated formulae and casks, then run cleanup.              |
+| `bubo`   | `brew update && brew outdated`        | Update Homebrew data, then list outdated formulae and casks.        |
 | `bubu`   | `bubo && bubc`                        | Do the last two operations above.                                   |
 | `buf`    | `brew upgrade --formula`              | Upgrade only formulas (not casks).                                  |
-| `bcubo`  | `brew update && brew outdated --cask` | Update Homebrew data, then list outdated casks.                     |
-| `bcubc`  | `brew upgrade --cask && brew cleanup` | Update outdated casks, then run cleanup.                            |
 
 ## Completion
 

plugins/brew/brew.plugin.zsh

+if (( ! $+commands[brew] )); then
+  if [[ -x /opt/homebrew/bin/brew ]]; then
+    BREW_LOCATION="/opt/homebrew/bin/brew"
+  elif [[ -x /usr/local/bin/brew ]]; then
+    BREW_LOCATION="/usr/local/bin/brew"
+  elif [[ -x /home/linuxbrew/.linuxbrew/bin/brew ]]; then
+    BREW_LOCATION="/home/linuxbrew/.linuxbrew/bin/brew"
+  elif [[ -x "$HOME/.linuxbrew/bin/brew" ]]; then
+    BREW_LOCATION="$HOME/.linuxbrew/bin/brew"
+  else
+    return
+  fi
+fi
+
+if [[ -z "$HOMEBREW_PREFIX" ]]; then
+  if [[ -z $BREW_LOCATION ]]; then
+    eval "$(brew shellenv)"
+  else
+    eval "$("$BREW_LOCATION" shellenv)"
+  fi
+fi
+
+unset BREW_LOCATION
+
+alias bcubc='brew upgrade --cask && brew cleanup'
+alias bcubo='brew update && brew outdated --cask'
 alias brewp='brew pin'
 alias brewsp='brew list --pinned'
-alias bubo='brew update && brew outdated'
 alias bubc='brew upgrade && brew cleanup'
+alias bubo='brew update && brew outdated'
 alias bubu='bubo && bubc'
 alias buf='brew upgrade --formula'
-alias bcubo='brew update && brew outdated --cask'
-alias bcubc='brew upgrade --cask && brew cleanup'
 
 function brews() {
   local formulae="$(brew leaves | xargs brew deps --installed --for-each)"