Generates an Objective-C header file based on the selection.json file generated along by an iconmoon.io font package

generate-header.rb

#!/usr/local/bin/ruby
require 'rubygems'
require 'json'

fail("Input file not specified") unless ARGV.length == 1
input = ARGV.first
fail("Input file #{input} not found") unless File.exists?(input)

result = JSON.parse (File.read input), :symbolize_names => true
icons = result[:icons]
defines = ""
puts "Processing #{icons.length} icons..."
icons.each do |elt|
	props = elt[:properties]
	name = "ICON-#{props[:name].upcase}"
	# Will produce a define line with the following pattern: #define ICON-<name> "<unicode>"
	defines << %Q<#define #{name} "\\u#{props[:code].to_s(16)}"\n>
end

fontFamily = result[:preferences][:fontPref][:metadata][:fontFamily]
File.open("IconHeader.h", "w") do |file|
	file << %Q<static NSString *const kIconFamilyName = @"#{fontFamily}";\n\n>
	file << defines
end