feat(cli): add `--enabled` flag to `omz plugin list` (#13128)

lib/cli.zsh

@@ -72,6 +72,10 @@ function _omz {
         local -aU plugins
         plugins=("$ZSH"/plugins/*/{_*,*.plugin.zsh}(-.N:h:t) "$ZSH_CUSTOM"/plugins/*/{_*,*.plugin.zsh}(-.N:h:t))
         _describe 'plugin' plugins ;;
+      plugin::list)
+        local -a opts
+        opts=('--enabled:List enabled plugins only')
+        _describe -o 'options' opts ;;
       theme::(set|use))
         local -aU themes
         themes=("$ZSH"/themes/*.zsh-theme(-.N:t:r) "$ZSH_CUSTOM"/**/*.zsh-theme(-.N:r:gs:"$ZSH_CUSTOM"/themes/:::gs:"$ZSH_CUSTOM"/:::))
@@ -206,7 +210,7 @@ Available commands:
   disable <plugin> Disable plugin(s)
   enable <plugin>  Enable plugin(s)
   info <plugin>    Get information of a plugin
-  list             List all available Oh My Zsh plugins
+  list [--enabled] List Oh My Zsh plugins
   load <plugin>    Load plugin(s)
 
 EOF
@@ -449,8 +453,21 @@ function _omz::plugin::info {
 
 function _omz::plugin::list {
   local -a custom_plugins builtin_plugins
-  custom_plugins=("$ZSH_CUSTOM"/plugins/*(-/N:t))
-  builtin_plugins=("$ZSH"/plugins/*(-/N:t))
+
+  # If --enabled is provided, only list what's enabled
+  if [[ "$1" == "--enabled" ]]; then
+    local plugin
+    for plugin in "${plugins[@]}"; do
+      if [[ -d "${ZSH_CUSTOM}/plugins/${plugin}" ]]; then
+        custom_plugins+=("${plugin}")
+      elif [[ -d "${ZSH}/plugins/${plugin}" ]]; then
+        builtin_plugins+=("${plugin}")
+      fi
+    done
+  else
+    custom_plugins=("$ZSH_CUSTOM"/plugins/*(-/N:t))
+    builtin_plugins=("$ZSH"/plugins/*(-/N:t))
+  fi
 
   # If the command is being piped, print all found line by line
   if [[ ! -t 1 ]]; then