From 570a6607588e5aa2c5dca29d5c2e1328e906b6c3 Mon Sep 17 00:00:00 2001
From: Issy Long <me@issyl0.co.uk>
Date: Thu, 24 Dec 2020 13:19:02 +0000
Subject: [PATCH] cli/parser: Only prefix short options with one dash
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- This avoids error messages like:

```
➜ brew list -l
Error: Invalid usage: `--l` cannot be passed without `--formula`.
```
---
 Library/Homebrew/cli/parser.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/cli/parser.rb b/Library/Homebrew/cli/parser.rb
index 907b4cd17b..5937d66a1f 100644
--- a/Library/Homebrew/cli/parser.rb
+++ b/Library/Homebrew/cli/parser.rb
@@ -533,8 +533,8 @@ module Homebrew
 
     class OptionConstraintError < UsageError
       def initialize(arg1, arg2, missing: false)
-        arg1 = "--#{arg1.tr("_", "-")}"
-        arg2 = "--#{arg2.tr("_", "-")}"
+        arg1 = arg1.length > 1 ? "--#{arg1.tr("_", "-")}" : "-#{arg1.tr("_", "-")}"
+        arg2 = arg2.length > 1 ? "--#{arg2.tr("_", "-")}" : "-#{arg2.tr("_", "-")}"
 
         message = if missing
           "`#{arg2}` cannot be passed without `#{arg1}`."