From 604dfb4ae64270cfdf86a2355c8b795d9accd803 Mon Sep 17 00:00:00 2001
From: Gautham Goli <goligautham@gmail.com>
Date: Tue, 2 Oct 2018 19:34:46 +0530
Subject: [PATCH] help: Let OptionParser generate help text for supported
 commands

---
 Library/Homebrew/dev-cmd/prof.rb | 2 +-
 Library/Homebrew/help.rb         | 9 +++++++--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/Library/Homebrew/dev-cmd/prof.rb b/Library/Homebrew/dev-cmd/prof.rb
index 0a7409ec53..ebf9dc98e3 100644
--- a/Library/Homebrew/dev-cmd/prof.rb
+++ b/Library/Homebrew/dev-cmd/prof.rb
@@ -1,7 +1,7 @@
 #:  * `prof` [ruby options]:
 #:    Run Homebrew with the Ruby profiler.
 #:    For example:
-#       brew prof readall
+#:       brew prof readall
 
 module Homebrew
   module_function
diff --git a/Library/Homebrew/help.rb b/Library/Homebrew/help.rb
index b1bc461e4e..3d334901bd 100644
--- a/Library/Homebrew/help.rb
+++ b/Library/Homebrew/help.rb
@@ -38,8 +38,13 @@ module Homebrew
     module_function
 
     def help(cmd = nil, flags = {})
-      # Let OptionParser generate help text for developer commands
-      return if require? HOMEBREW_LIBRARY_PATH/"dev-cmd"/cmd
+      # Let OptionParser generate help text for commands which have a parser defined
+      begin
+        Homebrew.send("#{cmd.gsub('-','_')}_args".to_sym)
+        return
+      rescue NoMethodError
+        nil
+      end
 
       # Resolve command aliases and find file containing the implementation.
       if cmd