Visualize circleci.yml workflow in mermaid

circleci_workflow_visualize.rb

require 'yaml'

CONFIG_FILE = ARGV[0]

config = YAML.load_file(CONFIG_FILE)

config['workflows'].each do |workflow_name, workflow|
  next unless workflow.is_a?(Hash)

  puts "### #{workflow_name}"
  puts '```mermaid'
  puts 'flowchart LR'

  node_id_map = Hash.new { |h, k| h[k] = "N#{h.size}" }
  job_name_alias_map = {}

  workflow['jobs'].each do |job_bare|
    case job_bare
    when Hash
      job_name = job_bare.keys.first
      job = job_bare[job_name]
    else
      job_name = job_bare
      job = {}
    end

    # Renaming
    if job['name']
      job_name_alias_map[job['name']] = job_name
      job_name = job['name']
    end

    # Add node
    node_id_map[job_name]

    # Path
    job['requires']&.each do |dependency|
      puts "#{node_id_map[dependency]} --> #{node_id_map[job_name]}"
    end
  end

  node_id_map.each do |name, id|
    org_name = job_name_alias_map[name]
      &.tap { |v| break " (#{v})" }
    puts "#{id}[\"#{name}#{org_name}\"]"
  end

  puts '```'
end