From f5cc26ffc66ef6b987cc853d7e1d4840218b001a Mon Sep 17 00:00:00 2001
From: Jonathan Chang <me@jonathanchang.org>
Date: Wed, 27 Jan 2021 13:43:47 +1100
Subject: [PATCH] zsh: add guards to speed up completions

If we type `brew install -<TAB>` we shouldn't try to shell out to Ruby
to get a list of formulae for completions.
---
 Library/Homebrew/completions/zsh.erb | 16 ++++++++++++++++
 completions/zsh/_brew                | 16 ++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/Library/Homebrew/completions/zsh.erb b/Library/Homebrew/completions/zsh.erb
index 0cfb22c9bc..2f401de7a1 100644
--- a/Library/Homebrew/completions/zsh.erb
+++ b/Library/Homebrew/completions/zsh.erb
@@ -49,6 +49,8 @@ __brew_completion_caching_policy() {
 }
 
 __brew_formulae() {
+  [[ -prefix '-' ]] && return 0
+
   local -a list
   local comp_cachename=brew_formulae
   if ! _retrieve_cache $comp_cachename; then
@@ -59,18 +61,24 @@ __brew_formulae() {
 }
 
 __brew_installed_formulae() {
+  [[ -prefix '-' ]] && return 0
+
   local -a formulae
   formulae=($(brew list --formula))
   _describe -t formulae 'installed formulae' formulae
 }
 
 __brew_outdated_formulae() {
+  [[ -prefix '-' ]] && return 0
+
   local -a formulae
   formulae=($(brew outdated --formula))
   _describe -t formulae 'outdated formulae' formulae
 }
 
 __brew_casks() {
+  [[ -prefix '-' ]] && return 0
+
   local -a list
   local expl
   local comp_cachename=brew_casks
@@ -84,6 +92,8 @@ __brew_casks() {
 }
 
 __brew_installed_casks() {
+  [[ -prefix '-' ]] && return 0
+
   local -a list
   local expl
   list=( $(brew list --cask) )
@@ -91,18 +101,24 @@ __brew_installed_casks() {
 }
 
 __brew_outdated_casks() {
+  [[ -prefix '-' ]] && return 0
+
   local -a casks
   casks=($(brew outdated --cask))
   _describe -t casks 'outdated casks' casks
 }
 
 __brew_installed_taps() {
+  [[ -prefix '-' ]] && return 0
+
   local -a taps
   taps=($(brew tap))
   _describe -t installed-taps 'installed taps' taps
 }
 
 __brew_any_tap() {
+  [[ -prefix '-' ]] && return 0
+
   _alternative \
     'installed-taps:installed taps:__brew_installed_taps'
 }
diff --git a/completions/zsh/_brew b/completions/zsh/_brew
index ea24e0e408..a91f6b4635 100644
--- a/completions/zsh/_brew
+++ b/completions/zsh/_brew
@@ -52,6 +52,8 @@ __brew_completion_caching_policy() {
 }
 
 __brew_formulae() {
+  [[ -prefix '-' ]] && return 0
+
   local -a list
   local comp_cachename=brew_formulae
   if ! _retrieve_cache $comp_cachename; then
@@ -62,18 +64,24 @@ __brew_formulae() {
 }
 
 __brew_installed_formulae() {
+  [[ -prefix '-' ]] && return 0
+
   local -a formulae
   formulae=($(brew list --formula))
   _describe -t formulae 'installed formulae' formulae
 }
 
 __brew_outdated_formulae() {
+  [[ -prefix '-' ]] && return 0
+
   local -a formulae
   formulae=($(brew outdated --formula))
   _describe -t formulae 'outdated formulae' formulae
 }
 
 __brew_casks() {
+  [[ -prefix '-' ]] && return 0
+
   local -a list
   local expl
   local comp_cachename=brew_casks
@@ -87,6 +95,8 @@ __brew_casks() {
 }
 
 __brew_installed_casks() {
+  [[ -prefix '-' ]] && return 0
+
   local -a list
   local expl
   list=( $(brew list --cask) )
@@ -94,18 +104,24 @@ __brew_installed_casks() {
 }
 
 __brew_outdated_casks() {
+  [[ -prefix '-' ]] && return 0
+
   local -a casks
   casks=($(brew outdated --cask))
   _describe -t casks 'outdated casks' casks
 }
 
 __brew_installed_taps() {
+  [[ -prefix '-' ]] && return 0
+
   local -a taps
   taps=($(brew tap))
   _describe -t installed-taps 'installed taps' taps
 }
 
 __brew_any_tap() {
+  [[ -prefix '-' ]] && return 0
+
   _alternative \
     'installed-taps:installed taps:__brew_installed_taps'
 }