#!/usr/bin/env ruby
#
# generate_issue_template_urls
#

###
### dependencies
###

require "erb"

###
### constants
###

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

###
### methods
###

def main(args)
  args.each do |file|
    File.read(file).scan(%r{(.*?)\n(.*)}m) do |title, body|
      puts generate_url(title, body)
    end
  end
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_urls <issue_template.md> ...

Given one or more GitHub issue template files, generate encoded URLs for each
and print, separated by newlines. 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.empty?
  puts usage
  exit 1
end

main(ARGV)