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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
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