require 'erb' require 'optparse' require 'fileutils' timestamp = nil output = nil ifchange = nil opt = OptionParser.new do |o| o.on('-t', '--timestamp[=PATH]') {|v| timestamp = v || true} o.on('-o', '--output=PATH') {|v| output = v} o.on('-c', '--[no-]if-change') {|v| ifchange = v} o.order!(ARGV) end or abort opt.opt_s template = ARGV.shift erb = ERB.new(File.read(template), nil, '%') erb.filename = template result = erb.result if output if ifchange and (IO.read(output) rescue nil) == result puts "#{output} unchanged" else open(output, "wb") {|f| f.print result} puts "#{output} updated" end if timestamp if timestamp == true dir, base = File.split(output) timestamp = File.join(dir, ".time." + base) end FileUtils.touch(timestamp) end else print result end