Generate the ~/.icewm/menu file from .desktop files.

update-icewm-menu.rb

#!/usr/bin/env ruby
# Generate the ~/.icewm/menu file from .desktop files.
#
# Written by Luiji Maryo in 2013, updated 2014
#
# Released under the CC0 license linked below, which is just a public domain
# release that handles countries that don't recognize the public domain or the
# ability of authors to release content directly into it.
#
# CC0 License: https://creativecommons.org/publicdomain/zero/1.0/

require 'fileutils'

Encoding.default_internal = 'UTF-8'
Encoding.default_external = 'UTF-8'

CATEGORIES = %w{
  AudioVideo Audio Video Development Education Game Graphics Network Office
  Settings System Utility
}

menus = {}

data_dirs = ENV['XDG_DATA_DIRS']
if data_dirs.nil? or data_dirs.empty?
  data_dirs = '/usr/local/share:/usr/share'
end

data_dirs.split(':').each do |dir|
  Dir[dir + '/applications/*.desktop'].each do |filename|
    puts filename

    File.open(filename) do |file|
      name = ''
      icon = ''
      exec = ''
      categories = ''

      file.each_line do |line|
	next if not line.include? '='

	key, value = line.chomp.split('=')
	value = (value or '')

	case key.downcase
	  when 'name' then name = value if name.empty?
	  when 'icon' then icon = value if icon.empty?
	  when 'exec' then exec = value if exec.empty?
	  when 'categories' then categories = value if categories.empty?
	end
      end

      exec.gsub! /%./, ''

      app = "  prog \"#{name}\" \"#{icon}\" #{exec}\n"
      in_category = false

      categories.split(';').each do |category|
	next unless CATEGORIES.include? category
	menus[category] = {} unless menus.include? category
	menus[category][name] = app
	in_category = true
      end

      unless in_category
	menus['Other'] = {} unless menus.include? 'Other'
	menus['Other'][name] = app
      end
    end
  end
end

unless Dir.exist? ENV['HOME'] + '/.icewm'
  FileUtils.mkdir_p ENV['HOME'] + '/.icewm'
end

File.open(ENV['HOME'] + '/.icewm/menu', 'w') do |output|
  menus.sort.each do |name, menu|
    output.write "menu \"#{name}\" \"\" {\n"

    menu.sort.each do |name, app|
      output.write app
    end

    output.write "}\n\n"
  end
end

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