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require 'erb'
require 'optparse'
require 'fileutils'
vpath = ["."]
def vpath.open(file, *rest)
find do |dir|
begin
path = File.join(dir, file)
return File.open(path, *rest) {|f| yield(f)}
rescue Errno::ENOENT
nil
end
end or raise(Errno::ENOENT, file)
end
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.on('-v', '--vpath=DIR') {|dirs| vpath.concat dirs.split(File::PATH_SEPARATOR)}
o.order!(ARGV)
end
template = ARGV.shift or abort opt.to_s
erb = ERB.new(File.read(template), nil, '%')
erb.filename = template
result = erb.result
if output
if ifchange and (vpath.open(output) {|f| f.read} 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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