Automatically convert vue sfc with default html into pug using an API

convert_vue_html_to_pug.rb

#!/usr/bin/env ruby
require 'bundler/inline'

# Usage: just ruby with a recentish ruby (2.4+) and bundler inline should download necessary gems
# The conversion is done by https://html2pug.now.sh/convert
# - This script is a wrapper that walks a tree of *.vue files and converts the inner <template>
# - The script is interactive and ask before saving each file
#
# - Note: <UpperCase> custom components become upper-case() in pug
# - Note: the remote api seems to have problems with ternary inline code in html attributes

gemfile do
  source 'https://rubygems.org'
  gem 'tty-prompt'
  gem 'pry'
  gem 'diffy'
  gem 'activesupport'
end

OPTIONS = {
  "bodyless" => true,
  "donotencode" => true,
  "double" => true,
  "inlineCSS" => false,
  "noattrcomma" => true,
  "nspaces" => 2,
  "tabs" => false
}.freeze

require 'net/http'
require 'active_support/json'
require 'active_support/core_ext'
require 'json'

if ARGV.length == 0
  puts "USAGE: #{__FILE__} *PATH_TO_VUE/DIR"
  exit 1
end

files = []
ARGV.each do |elem|
  if File.directory?(elem)
    files += Dir["#{elem}/**/*.vue"]
  else
    files << elem
  end
end

class ConvertingFile
  def initialize(file)
    @content = File.read(file)
    @file = file
  end

  def convert!
    if @content["<template>"]
      convert_file
    end
  end

  # convert all custom EmailEditor to email-editor
  def preprocess_camelcase_names(template)
    template.gsub(%r{(<|</)([a-zA-Z]*[A-Z][a-zA-Z]*)}) do |_pattern|
      "#{Regexp.last_match(1)}#{Regexp.last_match(2).underscore.dasherize}"
    end
  end

  def convert_file
    final = @content.sub(%r{<template>(.*)</template>}m) do |_pattern|
      template = Regexp.last_match[1]
      "<template>\n#{html_to_pug(template)}</template>"
    end
    final.sub!('<template>', '<template lang="pug">')
    ask_and_compare(final)
  end

  def ask_and_compare(final)
    puts Diffy::Diff.new(@content, final, context: 1).to_s(:color)

    if TTY::Prompt.new.yes?("Save to #{@file}?")
      File.write(@file, final)
    end
  end

  def html_to_pug(template)
    url = URI.parse('https://html2pug.now.sh/convert')
    params = {
      "html" => preprocess_camelcase_names(template),
      "options" => OPTIONS
    }
    response = Net::HTTP.post(url, params.to_json, { 'Content-Type' => 'application/json; charset=utf-8' })
    unless response.code_type == Net::HTTPOK
      puts "Error while accessing remote api #{url} #{response.code}"
      puts response.body
      exit 1
    end
    JSON.parse(response.body)['pug']
  end
end

files.each do |file|
  ConvertingFile.new(file).convert!
end