Recursively browse directory and convert all .haml files to .erb via Herbalizer (https://github.com/danchoi/herbalizer)

hamlconvert.rb

#!/usr/bin/env ruby
require 'open3'

# things herbalizer hates:
# nested hashes: %div{data: {href: src }} -> %div{data: Hash[href: src] }
# comments in the first line
# blank first line
# ruby-style interpolation: Message to #{person} -> Message to \ = person
# ternary operators inside blocks: %div{href: one ? two : three } -> put on separate line

@failures = []
def convert_dir(path)
  dir = Dir.new(path)
  dir.each do |f|
    next if f == '.' || f == '..'
    convert_dir(File.join(dir.path, f)) and next if File.ftype(File.join(dir.path, f)) == "directory"
    next unless f =~ /\.haml$/
    
    filename = File.join(dir.path, f)
    dest = filename.gsub(/haml/, 'erb')
    stdout_str, stderr_str, status = Open3.capture3("herbalizer #{filename}")
    if stdout_str =~ /expecting new-line/
      File.open(filename, "a") {|f| f.write("\n") }
      stdout_str, stderr_str, status = Open3.capture3("herbalizer #{filename}")
    end
    
    if status == 0 && !(stdout_str =~ /\(line \d+, column \d+\):/)
      $stderr.puts "Writing #{filename[(@dir_path.length)..-1].gsub(/haml/, 'erb')}: #{stdout_str[0..20]}"
      File.open(dest, 'w') {|f| f.write(stdout_str) }
      `rm #{filename}` if File.exists?(dest)
    else
      fname = filename[(@dir_path.length)..-1]
      @failures << "#{fname}: #{stdout_str.gsub(/\s+/, ' ')}"
    end
  end
end


if ARGV.count == 0
  puts "Usage: hamlconvert.rb PATH"
  exit(1)
end

@dir_path = ARGV.first
convert_dir(@dir_path)

if @failures.count > 0
  puts "Failed on the following files:"
  puts @failures.join("\n")
else
  puts "Success!"
end