ember-cli - Improving TTA (Time To App)

fast-ember

#!/usr/bin/env ruby

require 'fileutils'
include FileUtils

template_dir    = ARGV[0] or fail 'You must supply a template directory'
new_project_dir = ARGV[1] or fail 'You must supply a new project name'
template_dir    = File.join(Dir.home, '.ember-cli-cache', template_dir)

fail "The template you are looking for does not exist '#{template_dir}'" unless File.exist? template_dir
fail "The project you are trying to create '#{new_project_dir}' already exists" if File.exist? new_project_dir

puts "Copying #{template_dir} to #{new_project_dir}"

cp_r template_dir, new_project_dir

capitalize = lambda do |input|
  result = input.capitalize
  result.gsub(/([-|_])(\w)/) { Regexp.last_match[2].upcase }
end

patterns = {}
patterns[template_dir] = new_project_dir
patterns[capitalize.call(template_dir)] = capitalize.call(new_project_dir)

patterns.each do |pre, post, _|
  puts "Looking at pattern #{pre} replacing with #{post}"
  puts '*' * 80
  paths = `ag #{pre} --nocolor #{template_dir} -l`.split("\n").map(&:strip)
  paths.each do |path|
    new_file = path.gsub template_dir, new_project_dir
    contents = File.read(new_file)
    contents.gsub! pre, post
    File.open(new_file, 'w') { |file| file.write contents }
    puts "Updated #{new_file}"
  end
  puts
end

thoughts.md

The following is a quick and dirty ruby script that was written to show some areas that I think are worth exploring. There is a decent time cost endured when typing ember new my-rad-app. This can be optimized a great deal. Furthermore the internet is typically required when generating a new ember app. This little hack attempts to reduce and remove those two problems.

The problems are solved by generating an ember app once by typing ember new template-app and then using that template-app as a template for all newly generated apps by

• copying the original to the new app directory
• replacing all original app name references with the new app name

Note This is not meant to be me complaining about, nor badgering what is available today in ember-cli. There has been a tremendous amount of effort put into ember-cli and I am forever grateful of that fact. This little snippet is more to collect thoughts and start down the path of fixing the problem.

ember new my-thing @ 60+ seconds https://dr.tt/view?d=5ono6hw226vqcas%2F2016-03-06%20at%209.32%20PM.png%2F

fast-ember template my-thing @ 3 seconds http://bit.ly/24KGtF5

usage.md

The script requires a couple of things

• ruby 2.0+
• the_silver_searcher (ag)
• the ruby script provided below (executable chmod a+x fast-ember)
• an ember project for templating
• cached apps must be in ~/.ember-cli-cache

note the current state of the script requires that all of this happens in the same directory. It is a POC ;)

I totally agree there, I guess I should clarify. I am not suggesting that this be on by default. What if say there was a public interface like this: ember new my-rad-app --cache Where the first time it was ran and from then on out you get the speed benefit. I guess another thing to think about there is a way of refreshing the "cache"