From e62ad08af8f6555e838f8c21ab4ad1ac5e47b26e Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Sat, 29 Jun 2013 13:25:55 +0100
Subject: [PATCH] brew-cleanup-installed: add new external command.

brew-cleanup-installed: uninstall all non-whitelisted Homebrew formulae.

Useful for maintainers/testers who regularly install lots of formulae
they don't actually use.

Populate ~/.brew-cleanup-installed with the formulae you want to keep
installed. All others will be uninstalled when brew-cleanup-installed is run.
---
 .../Contributions/cmd/brew-cleanup-installed  | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100755 Library/Contributions/cmd/brew-cleanup-installed

diff --git a/Library/Contributions/cmd/brew-cleanup-installed b/Library/Contributions/cmd/brew-cleanup-installed
new file mode 100755
index 0000000000..9ce9ccbe50
--- /dev/null
+++ b/Library/Contributions/cmd/brew-cleanup-installed
@@ -0,0 +1,22 @@
+#!/bin/sh
+# brew-cleanup-installed: uninstall all non-whitelisted Homebrew formulae.
+#
+# Useful for maintainers/testers who regularly install lots of formulae
+# they don't actually use.
+#
+# Populate ~/.brew-cleanup-installed with the formulae you want to keep
+# installed. All others will be uninstalled when brew-cleanup-installed is run.
+
+# Exit on any command failures
+set -e
+
+BREW_CLEAN_WHITELIST=~/.brew-cleanup-installed
+# Do nothing and exit if the file doesn't exist.
+[ -s $BREW_CLEAN_WHITELIST ]
+BREW_LIST=$TMPDIR/brew-installed-list
+
+# comm needs both lists to be sorted so ensure the dotfile is sorted first.
+sort --unique ~/.brew-cleanup-installed --output ~/.brew-cleanup-installed
+brew list > $BREW_LIST
+comm -13 $BREW_CLEAN_WHITELIST $BREW_LIST | xargs brew uninstall
+rm $BREW_LIST