link_gnu_coreutils.rb

#!/usr/bin/env ruby
#coding:utf-8
require 'pp'
require 'optparse'

opt = OptionParser.new
link=nil
begin 
		opt.on("-e", "--link","brew の gnuコマンドを/usr/local/bin にリンクします"){ link=true; }
		opt.on("-d", "--unlink","brew の gnuコマンドを/usr/local/bin から削除します"){ link=false }
		opt.parse!(ARGV)

		if link.nil?
				raise OptionParser::InvalidOption
		end

rescue OptionParser::InvalidOption
		ARGV << "-h"
		retry
end

# coreutils にあるg 始まりのコマンドで/usr/local/binにあるものは消しておこう
Dir.glob("/usr/local/opt/coreutils/bin/*").map{|e| "/usr/local/bin/" + File.basename(e)}.each{|e| File.unlink(e) if File.exist?(e)  }
## gnubin ディレクトリにg* prefix なしのコマンドが用意されている
cmds = Dir.glob("/usr/local/opt/coreutils/libexec/gnubin/*").map{|e| e}
cmds.each{|e|
		case link 
		when true
				puts "link #{e} --> /usr/local/bin/#{File.basename e}\n" if link == true
				File.unlink "/usr/local/bin/#{File.basename e}" if File.exist?("/usr/local/bin/#{File.basename e}")
				File.symlink e, "/usr/local/bin/#{File.basename e}"
		when false
				puts "unlink /usr/local/bin/#{File.basename e}\n"
				File.unlink "/usr/local/bin/#{File.basename e}" if File.exist?("/usr/local/bin/#{File.basename e}")
		end
}


## その他 gプレフィックスが付いているもの
other_cmds = [
		"/usr/local/bin/ggrep",
		"/usr/local/bin/gtar",
		"/usr/local/bin/gsed",
]
other_cmds += Dir.glob("/usr/local/opt/binutils/bin/*")
other_cmds += Dir.glob("/usr/local/opt/gnu-indent/bin/*")
other_cmds += Dir.glob("/usr/local/opt/gnu-tar/bin/*")
other_cmds += Dir.glob("/usr/local/opt/gnu-sed/bin/*")

other_cmds.each{|e|
		name = File.basename(e).gsub(/^g/,"")
		case link
		when true
				File.unlink "/usr/local/bin/#{name}" if File.exists? "/usr/local/bin/#{name}"
				puts "link  #{e} --> /usr/local/bin/#{name}"
				File.link "#{e}" ,"/usr/local/bin/#{name}"
		when false
				puts "unlink /usr/local/bin/#{name}\n"
				File.unlink "/usr/local/bin/#{name}"  if File.exists?( "/usr/local/bin/#{name}" )
		end
}