Tiny task/etc system for Python.

tiny_task.py

# 
# Tiny task system
# ~boxmein 2014
# free to use
# 

# {'name': callback, ...}
tasks = {}

# Add a task
def add_task(name, callback): 
  tasks[name] = {'callback': callback, 'called': False}

# (decorator!) This task depends on other tasks: (check for dupes)
def depends(f, *deps):
  def func():
    for dep in deps:
      do_task(dep)
    f()
  return func

# (decorator!) This task depends on other tasks: (don't check for dupes)
def depends1(f, *deps):
  def func(): 
    for dep in deps: 
      do_task(dep, duplicate_check=False)
    f()
  return func

# (decorator!) After this task, run these tasks: (check for dupes)
def after_depends(f, *deps):
  def func():
    f()
    for dep in deps:
      do_task(dep)
  return func

# (decorator!) After this task, run these tasks: (don't check for dupes)
def after_depends1(f, *deps):
  def func(): 
    f()
    for dep in deps: 
      do_task(dep, duplicate_check=False)  
  return func

# (decorator!) After all calls to this task, run these tasks: (don't check for dupes)

# (decorator!) Add a task: 
def task(f):
  add_task(f.__name__, f)
  print ('discovered task: ' + f.__name__ + (': ' + f.__doc__ if f.__doc__ else ''))
  return f

# Run a task
# (check for if it's run twice with duplicate_check=True)
def do_task(name, duplicate_check=True): 
  name = str(name)
  if name in tasks:
    if duplicate_check and not tasks[name].called:
      print ('running task: ' + name)
      tasks[name].called = True
      tasks[name].callback()
    else if not duplicate_check:
      print ('running task: ' + name)
      tasks[name].called = True
      tasks[name].callback()
    else: 
      print ('skipping task: ' + name)

# Run all tasks listed in sys.argv
def do_all_tasks(): 
  import sys
  for arg in sys.argv[1:]:
    do_task(arg)
    
# ---
# define tasks here
# ---

do_all_tasks()

# Example usage
# @task
# @depends('other_task')
# def this_task():
#   """ doc string """
#   print ('hello world')
# @task
# def other_task():
#   """ doc string """
#   print ('goodbye world')
# 
# running python file.py this_task will output:
# goodbye world
# hello world