pyxcute 0.5.0

A small task runner inspired by npm scripts.

A small task runner inspired by npm scripts.

Features

• Use it like setuptools.

• Chain tasks with _pre, _err, _post, _fin suffix.

• A builtin Bump task which can bump version with semver.

• A small set of cross-platform CLI utils.

Installation

>From pypi

pip install pyxcute

Usage

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

Cross-platform utils

There are some CLI utils inspired by npm-build-tools, including:

• x-clean

• x-cat

• x-copy

• x-pipe

Run each command with -h to see the help message.

Live example

Checkout the cute file of pyXcute itself.

Documentation

http://pyxcute.readthedocs.io/en/latest/

Changelog

• 0.5.0 (Next)

  • Add: support Python 2.

  • Add: documentation.

  • Add: Skip, run_task, task_converter.

  • Add: `Bump` task now update the version number inside `setup.cfg`.

  • Fix: Cmd task failed on Unix due to shell=True and passing args as a list.

  • Change: the command of `Cmd` is now logged. The log message is also changed.

  • Drop: `noop`.

• 0.4.1 (Apr 3, 2017)

  • Better description for x-clean.

  • Fix broken pipe error in x-pipe.

• 0.4.0 (Mar 28, 2017)

  • Switch to setup.cfg.

  • Add log, exc, noop, Throw, Try.

  • Drop Exc, Exit.

  • Add x-* utils.

• 0.3.1 (Mar 23, 2017)

  • Find version from {pkg_name}/__pkginfo__.py.

• 0.3.0 (Jul 21, 2016)

  • Add pkg_name task.

  • Add default tasks bump, version.

• 0.2.0 (May 14, 2016)

  • Add _fin tag, which represent finally clause.

  • Add Exc and Exit tasks.

• 0.1.2 (Apr 20, 2016)

  • Move _pre out of try clause.

• 0.1.1 (Apr 20, 2016)

  • Bump dev status.

• 0.1.0 (Apr 20, 2016)

  • First release.