brew-audit - add check for tabs.

Add a new mode "brew audit --warn" that performs stricter checks
that might not need to be fixed.

Currently this includes a check for using tabs instead of spaces
for indentation; Homebrew style is "2-space indentation."

Documented this new switch.

Library/Contributions/examples/brew-audit.rb

@@ -80,14 +80,20 @@ def audit_formula_text text
   end
 
   # No trailing whitespace, please
-  if text =~ /[ ]+$/
+  if text =~ /(\t|[ ])+$/
     problems << " * Trailing whitespace was found."
   end
 
   if text =~ /if\s+ARGV\.include\?\s+'--HEAD'/
     problems << " * Use \"if ARGV.build_head?\" instead"
   end
 
+	if ARGV.include? "--warn"
+	  if text =~ /^\t/
+	    problems << " * Use spaces instead of tabs for indentation"
+	  end
+	end
+
   return problems
 end
 

Library/Contributions/manpages/brew.1.md

@@ -188,10 +188,13 @@ to recognize `brew cmdname`.
 
 Some external commands are shipped with Homebrew, and enabled by default.
 
-  * `audit`:
+  * `audit [--warn]`:
     Checks all formulae for Homebrew coding style violations. This should be
     run before submitting a new formula for inclusion.
 
+    If `--warn` is passed, performs additional stricter checks that may not need
+    to be fixed before submitting.
+
   * `options` <formula>:
     Displays install options specific to <formula>.
 

share/man/man1/brew.1

@@ -197,9 +197,12 @@ Homebrew allows external commands to be defined by putting a +x file named \fBbr
 Some external commands are shipped with Homebrew, and enabled by default\.
 .
 .TP
-\fBaudit\fR
+\fBaudit [\-\-warn]\fR
 Checks all formulae for Homebrew coding style violations\. This should be run before submitting a new formula for inclusion\.
 .
+.IP
+If \fB\-\-warn\fR is passed, performs additional stricter checks that may not need to be fixed before submitting\.
+.
 .TP
 \fBoptions\fR \fIformula\fR
 Displays install options specific to \fIformula\fR\.