Original Prototype Rake

This is the original 100 line prototype rake program.

#!/usr/bin/env ruby

require 'ftools'

class Task TASKS = Hash.new

attr_reader :prerequisites

def initialize(task_name)
 @name = task_name
 @prerequisites = []
 @actions = []
end

def enhance(deps=nil, &block)
 @prerequisites |= deps if deps
 @actions << block if block_given?
 self
end

def name
 @name.to_s
end

def invoke
 @prerequisites.each { |n| Task[n].invoke }
 execute if needed?
end

def execute
 return if @triggered
 @triggered = true
 @actions.collect { |act| result = act.call(self) }.last
end

def needed?
 true
end

def timestamp
 Time.now
end

class << self
 def [](task_name)
   TASKS[intern(task_name)] or fail "Don't know how to rake #{task_name}"
 end

 def define_task(args, &block)
   case args
   when Hash
fail "Too Many Target Names: #{args.keys.join(' ')}" if args.size > 1
fail "No Task Name Given" if args.size < 1
task_name = args.keys[0]
deps = args[task_name]
   else
task_name = args
deps = []
   end
   deps = deps.collect {|d| intern(d) }
   get(task_name).enhance(deps, &block)
 end

 def get(task_name)
   name = intern(task_name)
   TASKS[name] ||= self.new(name)
 end

 def intern(task_name)
   (Symbol === task_name) ? task_name : task_name.intern
 end
end

end

class FileTask < Task def needed? return true unless File.exist?(name) latest_prereq = @prerequisites.collect{|n| Task[n].timestamp}.max return false if latest_prereq.nil? timestamp < latest_prereq end

def timestamp
 File.new(name.to_s).mtime
end

end

def task(args, &block) Task.define_task(args, &block) end

def file(args, &block) FileTask.define_task(args, &block) end

def sys(cmd) puts cmd system(cmd) or fail "Command Failed: [#cmd]" end

def rake begin here = Dir.pwd while ! File.exist?("Rakefile") Dir.chdir("..") fail "No Rakefile found" if Dir.pwd == here here = Dir.pwd end puts "(in #Dir.pwd)" load "./Rakefile" ARGV.push("default") if ARGV.size == 0 ARGV.each { |task_name| Task.invoke } rescue Exception => ex puts "rake aborted ... #ex.message" puts ex.backtrace.find {|str| str =~ /Rakefile/ } || "" end end

if FILE == $0 then rake end