#!/usr/bin/env ruby
#
# generate_issue_template_url
#

###
### dependencies
###

require "erb"

###
### constants
###

BASE_URL = "https://github.com/caskroom/homebrew-cask/issues/new".freeze

###
### methods
###

def main(args)
  title, body = File.read(args[0]).match(%r{(.*?)\n(.*)}m).captures
  print generate_url(title, body)
end

def generate_url(title, body)
  encoded_title = url_encode(title)
  encoded_body = url_encode(body)
  if $debug
    puts "Encoded title: #{encoded_title}"
    puts "Encoded body: #{encoded_body}"
  end
  "#{BASE_URL}?title=#{encoded_title}&body=#{encoded_body}"
end

def url_encode(unencoded_str)
  ERB::Util.url_encode(unencoded_str)
end

###
### main
###

usage = <<-EOS
Usage: generate_issue_template_url <issue_template.md>

Print an encoded URL for the given GitHub issue template. The first line of
a template file should be the issue title.

With -debug, print out the encoded title and body individually as well.

EOS

if ARGV.first =~ %r{^-+h(elp)?$}i
  puts usage
  exit 0
end

if ARGV.first =~ %r{^-+debug?$}i
  $debug = 1
  ARGV.shift
end

if ARGV.size != 1
  puts usage
  exit 1
end

main(ARGV)