Homebrew uninstall script

## unbrew.rb
#!/usr/bin/env ruby
#
# CLI tool for locating and removing a Homebrew installation
# http://brew.sh/
#
# Copyright (C) 2014 Stephen C. Benner
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Author: Stephen Benner
# https://github.com/SteveBenner
#
# Contributors:
# - @AaronKulick
#
# NOTE: This script has only been tested and verified to work in OS X 10.9
#
require 'optparse'
require 'fileutils'
require 'open3'

$stdout.sync = true

# Default options
options = {
  :quiet     => false,
  :verbose   => true,
  :dry_run   => false,
  :force     => false,
  :find_path => false
}

optparser = OptionParser.new do |opts|
  opts.banner = 'Homebrew uninstaller' + $/
  opts.on('-q', '--quiet', 'Quiet mode - suppress output.') do |setting|
    options[:quiet]   = setting
    options[:verbose] = false
  end
  opts.on('-v', '--verbose', 'Verbose mode - print all operations.') { |setting| options[:verbose] = setting }
  opts.on('-d', '--dry', 'Dry run - print results, but perform no actual operations.') do |setting|
    options[:dry_run] = setting
  end
  opts.on('-f', '--force', 'Forces removal of files, bypassing prompt. USE WITH CAUTION!') do |setting|
    options[:force] = setting
  end
  opts.on('-p', '--find-path', 'Output homebrew location if found, then exit.') do |setting|
    options[:find_path] = setting
    options[:quiet]     = true
  end
  opts.on_tail('-h', '--help', '--usage', 'Display this message.') { puts opts; exit }
  opts.on_tail('--version', 'Display script version.') { puts opts.version; exit }
end
optparser.version = '0.1.2'
optparser.summary_width = 16
optparser.parse!

$quiet = options[:quiet] # provides access to option value within methods

# Files installed into the Homebrew repository
BREW_LOCAL_FILES = %w[
  .git
  Cellar
  Library/brew.rb
  Library/Homebrew
  Library/Aliases
  Library/Formula
  Library/Contributions
  Library/LinkedKegs
]
# Files that Homebrew installs into other system locations
BREW_SYSTEM_FILES = %W[
  #{ENV['HOME']}/Library/Caches/Homebrew
  #{ENV['HOME']}/Library/Logs/Homebrew
  /Library/Caches/Homebrew
]
$files = []

# This function runs given command in a sub-shell, expecting the output to be the
# path of a Homebrew installation. If given a block, it passes the shell output to
# the block for processing, using the return value of the block as the new path.
# Known Homebrew files are then scanned for and added to the file list. Then the
# directory is tested for a Homebrew installation, and the git index is added if
# a valid repo is found. The function won't run once a Homebrew installation is
# found, but it will accumulate untracked Homebrew files each invocation.
#
# @param  [String] cmd        A shell command to run
# @param  [String] error_msg  Message to print if command fails
#
def locate_brew_path(cmd, error_msg = 'check homebrew installation and PATH.')
  return if $brew_location # stop testing if we find a valid Homebrew installation
  puts "Searching for homewbrew installation using '#{cmd}'..." unless $quiet

  # Run given shell command along with any code passed-in via block
  path = `#{cmd}`.chomp
  path = yield(path) if block_given? # pass command output to your own fancy code block

  begin
    Dir.chdir(path) do
      # Search for known Homebrew files and folders, regardless of git presence
      $files += BREW_LOCAL_FILES.select { |file| File.exist? file }.map {|file| File.expand_path file }
      $files += Dir.glob('**/{man,bin}/**/brew*')
      # Test for Homebrew git repository (use popen3 so we can suppress git error output)
      repo_name = Open3.popen3('git remote -v') do |stdin, stdout, stderr|
        stderr.close
        stdout.read
      end
      if repo_name =~ /homebrew.git|Homebrew/
        $brew_location = path
      else
        return
      end
    end
  rescue StandardError # on normal errors, continue program
    return
  end
end

# Attempt to locate homebrew installation using a command and optional code block
# for processing the command results. Locating a valid path halts searching.
locate_brew_path 'brew --prefix'
locate_brew_path('which brew') { |output| File.expand_path('../..', output) }
locate_brew_path('command -v brew') { |output| File.expand_path('../..', output) }
locate_brew_path 'brew --prefix' do |output|
  output = output.split($/).first
  File.expand_path('../..', output)
end

# Found Homebrew installation
if $brew_location
  if options[:find_path]
    puts $brew_location
    exit
  end
  unless options[:quiet]
    puts "Homebrew found at: #{$brew_location}"
    begin # record kegs and taps for later output
      brewed = `brew list`
      tapped = `brew tap`
    rescue StandardError
    end
  end
  # Collect files indexed by git
  begin
    Dir.chdir($brew_location) do
      # Update file list (use popen3 so we can suppress git error output)
      Open3.popen3('git checkout master') { |stdin, stdout, stderr| stderr.close }
      $files += `git ls-files`.split.map {|file| File.expand_path file }
    end
  rescue StandardError => e
    puts e # Report any errors, but continue the script and collect any last files
  end
end

# Collect any files Homebrew may have installed throughout our system
$files += BREW_SYSTEM_FILES.select { |file| File.exist? file }

abort 'Failed to locate any homebrew files!' if $files.empty?

# DESTROY! DESTROY! DESTROY!
unless options[:force]
  print "Delete #{$files.count} files? "
  abort unless gets.rstrip =~ /y|yes/i
end

rm =
  if options[:dry_run]
    lambda { |entry| puts "deleting #{entry}" unless options[:quiet] }
  else
    lambda { |entry| FileUtils.rm_rf(entry, :verbose => options[:verbose]) }
  end

puts 'Deleting files...' unless options[:quiet]
$files.each(&rm)

# Print a list of formulae and kegs that were removed as part of the uninstall process
if brewed
  puts
  puts 'The following previously installed formulae were removed:'
  puts brewed
end
if tapped
  puts
  puts 'The following previously tapped kegs were removed:'
  puts tapped
end
	#!/usr/bin/env ruby
	#
	# CLI tool for locating and removing a Homebrew installation
	# http://brew.sh/
	#
	# Copyright (C) 2014 Stephen C. Benner
	#
	# This program is free software: you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# This program is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.
	#
	# Author: Stephen Benner
	# https://github.com/SteveBenner
	#
	# Contributors:
	# - @AaronKulick
	#
	# NOTE: This script has only been tested and verified to work in OS X 10.9
	#
	require 'optparse'
	require 'fileutils'
	require 'open3'

	$stdout.sync = true

	# Default options
	options = {
	:quiet => false,
	:verbose => true,
	:dry_run => false,
	:force => false,
	:find_path => false
	}

	optparser = OptionParser.new do \|opts\|
	opts.banner = 'Homebrew uninstaller' + $/
	opts.on('-q', '--quiet', 'Quiet mode - suppress output.') do \|setting\|
	options[:quiet] = setting
	options[:verbose] = false
	end
	opts.on('-v', '--verbose', 'Verbose mode - print all operations.') { \|setting\| options[:verbose] = setting }
	opts.on('-d', '--dry', 'Dry run - print results, but perform no actual operations.') do \|setting\|
	options[:dry_run] = setting
	end
	opts.on('-f', '--force', 'Forces removal of files, bypassing prompt. USE WITH CAUTION!') do \|setting\|
	options[:force] = setting
	end
	opts.on('-p', '--find-path', 'Output homebrew location if found, then exit.') do \|setting\|
	options[:find_path] = setting
	options[:quiet] = true
	end
	opts.on_tail('-h', '--help', '--usage', 'Display this message.') { puts opts; exit }
	opts.on_tail('--version', 'Display script version.') { puts opts.version; exit }
	end
	optparser.version = '0.1.2'
	optparser.summary_width = 16
	optparser.parse!

	$quiet = options[:quiet] # provides access to option value within methods

	# Files installed into the Homebrew repository
	BREW_LOCAL_FILES = %w[
	.git
	Cellar
	Library/brew.rb
	Library/Homebrew
	Library/Aliases
	Library/Formula
	Library/Contributions
	Library/LinkedKegs
	]
	# Files that Homebrew installs into other system locations
	BREW_SYSTEM_FILES = %W[
	#{ENV['HOME']}/Library/Caches/Homebrew
	#{ENV['HOME']}/Library/Logs/Homebrew
	/Library/Caches/Homebrew
	]
	$files = []

	# This function runs given command in a sub-shell, expecting the output to be the
	# path of a Homebrew installation. If given a block, it passes the shell output to
	# the block for processing, using the return value of the block as the new path.
	# Known Homebrew files are then scanned for and added to the file list. Then the
	# directory is tested for a Homebrew installation, and the git index is added if
	# a valid repo is found. The function won't run once a Homebrew installation is
	# found, but it will accumulate untracked Homebrew files each invocation.
	#
	# @param [String] cmd A shell command to run
	# @param [String] error_msg Message to print if command fails
	#
	def locate_brew_path(cmd, error_msg = 'check homebrew installation and PATH.')
	return if $brew_location # stop testing if we find a valid Homebrew installation
	puts "Searching for homewbrew installation using '#{cmd}'..." unless $quiet

	# Run given shell command along with any code passed-in via block
	path = `#{cmd}`.chomp
	path = yield(path) if block_given? # pass command output to your own fancy code block

	begin
	Dir.chdir(path) do
	# Search for known Homebrew files and folders, regardless of git presence
	$files += BREW_LOCAL_FILES.select { \|file\| File.exist? file }.map {\|file\| File.expand_path file }
	$files += Dir.glob('/{man,bin}//brew*')
	# Test for Homebrew git repository (use popen3 so we can suppress git error output)
	repo_name = Open3.popen3('git remote -v') do \|stdin, stdout, stderr\|
	stderr.close
	stdout.read
	end
	if repo_name =~ /homebrew.git\|Homebrew/
	$brew_location = path
	else
	return
	end
	end
	rescue StandardError # on normal errors, continue program
	return
	end
	end

	# Attempt to locate homebrew installation using a command and optional code block
	# for processing the command results. Locating a valid path halts searching.
	locate_brew_path 'brew --prefix'
	locate_brew_path('which brew') { \|output\| File.expand_path('../..', output) }
	locate_brew_path('command -v brew') { \|output\| File.expand_path('../..', output) }
	locate_brew_path 'brew --prefix' do \|output\|
	output = output.split($/).first
	File.expand_path('../..', output)
	end

	# Found Homebrew installation
	if $brew_location
	if options[:find_path]
	puts $brew_location
	exit
	end
	unless options[:quiet]
	puts "Homebrew found at: #{$brew_location}"
	begin # record kegs and taps for later output
	brewed = `brew list`
	tapped = `brew tap`
	rescue StandardError
	end
	end
	# Collect files indexed by git
	begin
	Dir.chdir($brew_location) do
	# Update file list (use popen3 so we can suppress git error output)
	Open3.popen3('git checkout master') { \|stdin, stdout, stderr\| stderr.close }
	$files += `git ls-files`.split.map {\|file\| File.expand_path file }
	end
	rescue StandardError => e
	puts e # Report any errors, but continue the script and collect any last files
	end
	end

	# Collect any files Homebrew may have installed throughout our system
	$files += BREW_SYSTEM_FILES.select { \|file\| File.exist? file }

	abort 'Failed to locate any homebrew files!' if $files.empty?

	# DESTROY! DESTROY! DESTROY!
	unless options[:force]
	print "Delete #{$files.count} files? "
	abort unless gets.rstrip =~ /y\|yes/i
	end

	rm =
	if options[:dry_run]
	lambda { \|entry\| puts "deleting #{entry}" unless options[:quiet] }
	else
	lambda { \|entry\| FileUtils.rm_rf(entry, :verbose => options[:verbose]) }
	end

	puts 'Deleting files...' unless options[:quiet]
	$files.each(&rm)

	# Print a list of formulae and kegs that were removed as part of the uninstall process
	if brewed
	puts
	puts 'The following previously installed formulae were removed:'
	puts brewed
	end
	if tapped
	puts
	puts 'The following previously tapped kegs were removed:'
	puts tapped
	end