From cf3486f98a5ddc8eae3c511f759471eff79cfcf8 Mon Sep 17 00:00:00 2001
From: Martin Afanasjew
Date: Tue, 19 Apr 2016 07:33:13 +0200
Subject: help: show command-specific help for invalid usage

Instead of always printing the generic help text, print command-specific
help if it is available and a command raised the `UsageError` exception.
Put the error message underneath the help text (was above) to avoid that
it scrolls off the screen.

Thereby fix a regression where handling the invalid usage would fail to
access `ARGV.usage` removed in c6536066dc39da653d265640c6ba6046bb5def98.
---
 Library/Homebrew/cmd/help.rb | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'Library/Homebrew/cmd')

diff --git a/Library/Homebrew/cmd/help.rb b/Library/Homebrew/cmd/help.rb
index c8fc33430..b8dcad3d5 100644
--- a/Library/Homebrew/cmd/help.rb
+++ b/Library/Homebrew/cmd/help.rb
@@ -40,6 +40,14 @@ module Homebrew
       path = command_path(cmd)
     end
 
+    # Display command-specific (or generic) help in response to `UsageError`.
+    if (error_message = flags[:usage_error])
+      $stderr.puts path ? command_help(path) : HOMEBREW_HELP
+      $stderr.puts
+      onoe error_message
+      exit 1
+    end
+
     # Handle `brew` (no arguments).
     if flags[:empty_argv]
       $stderr.puts HOMEBREW_HELP
-- 
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