pyxcute 0.8.1

Basic

Create a cute.py file:

from xcute import cute

cute(
  hello = 'echo hello xcute!'
)

then run:

$ cute hello
> Task: hello
> Cmd: echo hello xcute!
hello xcute!

If you got a “not a command” error, see How do I make Python scripts executable?)

“hello” is the name of the task that should be executed. If cute.py is executed without a task name, it will run the “default” task.

Provide additional arguments:

$ cute hello 123
> Task: hello
> Cmd: echo hello xcute! 123
hello xcute! 123

The arguments will be passed into the executor, which is xcute.Cmd.__call__ in this case.

Tasks

It can be a str:

from xcute import cute

cute(
  hello = 'echo hello'
)

If it match the name of another task, pyxcute will execute that task:

from xcute import cute

cute(
  hello = 'world', # execute "world" task when "hello" task is executed
  world = 'echo I am world task'
)

Use a list:

from xcute import cute

cute(
  hello = ['echo task1', 'echo task2']
)

Using an Exception would make the task fail:

from xcute import cute
cute(
  hello = Exception("error message")
)

Use anything that is callable:

from xcute import cute

cute(
  hello = lambda: print('say hello')
)

Actually, when you assign a non-callable value as a task, pyXcute converts it into a callable according to its type.

Task chain

Define the workflow with _pre, _err, _post, _fin suffix:

from xcute import cute

cute(
        hello_pre = 'echo _pre runs before the task',
        hello = 'echo say hello',
        hello_err = 'echo _err runs if there is an error in task, i.e, an uncaught exception or non-zero return code',
        hello_post = 'echo _post runs after the task if task successfully returned',
        hello_fin = 'echo _fin always runs after _post, _err just like finally'
)

When a task is executed, the task runner try to execute _pre task first, then the task itself, then the _post task. If the task raised an exception, then it goes to the _err task. _fin task would be executed whenever the task failed or not.

Pseudo code:

run(name + "_pre")
try:
        run(name, args)
except Exception:
        run(name + "_err")
else:
        run(name + "_post")
finally:
        run(name + "_fin")

Format string

pyXcute expands the command string with xcute.conf dictionary. The expansion is happened at run-time:

from xcute import conf, cute

conf["my_name"] = "world"

def change_my_name():
  conf["my_name"] = "bad world"

cute(
  hello = [
    "echo hello {my_name}",
    change_my_name,
    "echo hello {my_name}"
  ]
)

$ cute hello
> Task: hello
> Cmd: echo hello world
hello world
> Cmd: echo hello bad world
hello bad world