dev_completion

#!/usr/bin/env ruby

class DevCompletion

  # Cache the full typed command (eg "dev Web").
  def initialize(command)
    @command = command
  end

  # Prepend the current path to each directory name;
  # filter only paths matching the current typed path;
  # then tidy up the (escaped) output.
  def matches
    @matches ||= directories.map do |directory|
      target_directory ? "#{target_directory}/#{directory}" : directory
    end.select do |directory|
      directory.downcase[0, typed.length] == typed.downcase
    end.map do |path|
      # This should be done last.
      path.gsub("\\", '')
    end
  end

  # Cache the typed path (without the leading "dev<space>" part).
  def typed
    @typed ||= @command[/\s(.+?)$/, 1] || ''
  end

  # Cache the target directory.
  # Eg "dev Web/my_p<tab>" will set the target directory to "Web".
  def target_directory
    @target_directory ||= if typed =~ /\//
      split  = typed.split('/')
      joined = split[0...-1].join('/')
      joined.empty? ? split[0] : joined
    end
  end

  # Retrieve a (formatted) list of all directories within the target directory.
  def directories
    @directories ||= `cd ~/Dev/#{target_directory} ; ls -d */ | tr '' ' '`.split("\n")
  end

end

# Instantiate a new instance, passing in the full typed command, and printing the matches.
puts DevCompletion.new(ENV["COMP_LINE"]).matches
exit 0