vers

#!/usr/bin/env ruby
first_arg = ARGV.shift

VERSION_MATCH = /^(\d+)\.(\d+)\.(\d+)(-(\d+)([a-z]))?$/
VERSION_ENTRY = /(toast.version=)(.*)/

SETTINGS_FILE = 'build.settings'

def like a, target
  (a =~ target) != nil
end

def vers_match
  File.read(SETTINGS_FILE).match(VERSION_ENTRY)
end

def replace_version vers
  unless like vers, VERSION_MATCH
    puts "Not a valid version string!"
    exit 1
  end
  content = File.read(SETTINGS_FILE)
  content = content.gsub VERSION_ENTRY, "\\1#{vers}"
  File.write(SETTINGS_FILE, content)
end

if like first_arg, /^version$/
  version = vers_match
  puts "Current Version: #{version[2]}"
  print "New Version? "
  newvers = gets.chop!
  replace_version newvers
end

if like first_arg, /^(in|de)c(rement)?$/
  second_arg = ARGV.shift
  version = vers_match
  puts "Current Version: \t#{version[2]}"
  match = version[2].match(VERSION_MATCH)

  mod = like(first_arg, /inc/) ? 1 : -1

  newv = [match[1].to_i, match[2].to_i, match[3].to_i, match[5].to_i, match[6].ord]
  if like second_arg, /^maj/
    newv[0] += mod
  elsif like second_arg, /^min/
    newv[1] += mod
  elsif like second_arg, /^build/
    newv[2] += mod
  elsif like second_arg, /^pre/
    newv[4] += mod
    if mod == 1
      if newv[4] > "z".ord
        newv[4] = "a".ord
        newv[3] += 1
      end
    else
      if newv[4] < "a".ord
        newv[4] = "z".ord
        newv[3] -= 1
      end
    end
  end
  newv = "#{newv[0]}.#{newv[1]}.#{newv[2]}-#{newv[3]}#{newv[4].chr}"
  puts "New Version: \t\t#{newv}"
  replace_version newv
end