= 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[task_name].invoke }
rescue Exception => ex
puts "rake aborted ... #{ex.message}"
puts ex.backtrace.find {|str| str =~ /Rakefile/ } || ""
end
end
if __FILE__ == $0 then
rake
end
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