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.

2 files changed, 11 insertions, 2 deletions

diff --git a/Library/Contributions/examples/brew-audit.rb b/Library/Contributions/examples/brew-audit.rb
index 54d53d903..7b527f59b 100755
--- a/Library/Contributions/examples/brew-audit.rb
+++ b/Library/Contributions/examples/brew-audit.rb
@@ -80,7 +80,7 @@ def audit_formula_text text
   end
 
   # No trailing whitespace, please
-  if text =~ /[ ]+$/
+  if text =~ /(\t|[ ])+$/
     problems << " * Trailing whitespace was found."
   end
 
@@ -88,6 +88,12 @@ def audit_formula_text text
     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
 
diff --git a/Library/Contributions/manpages/brew.1.md b/Library/Contributions/manpages/brew.1.md
index d595cc4f8..5751f7d00 100644
--- a/Library/Contributions/manpages/brew.1.md
+++ b/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>.