Thursday, May 17, 2012

ANN: straight.command 0.1a1 - A command framework with a plugin architecture

New Project Announcement:

I'd like to announce a new project, based on straight.plugin, a command framework that provides a declarative way to define command-line options, sub-commands, and allows plugins from third-parties to expand commands.


This is all very early, I'm calling this version 0.1a1 and lots of things are missing, but here is an example (which works) of a small todo application built with this.


#!/usr/bin/env python

from __future__ import print_function
import sys
from straight.command import Command, Option, SubCommand

class List(Command):
    def run_default(self, **extra):
        for line in open(self.parent.args['filename']):
            print(line.strip('\n'))

class Add(Command):
    new_todo = Option(dest='new_todo', action='append')

    def run_default(self, new_todo, **extra):
        with open(self.parent.args['filename'], 'a') as f:
            for one_todo in new_todo:
                print(one_todo.strip('\n'), file=f)

class Todo(Command):
    filename = Option(dest='filename', action='store')

    list = SubCommand('list', List)
    add = SubCommand('add', Add)

if __name__ == '__main__':
    Todo().run(sys.argv[1:])

And a sample of the result of this little script:

$ ./todo.py todo.txt add "Write an example tool"
$ ./todo.py todo.txt add "Get the documentation cleaned up and on readthedocs"
$ ./todo.py todo.txt add "Blog about the project"
$ ./todo.py todo.txt list
Write an example tool
Get the documentation cleaned up and on readthedocs
Blog about the project

The documentation and source are both available now.

1 comment:

Anonymous said...

You might also want to have look at opster on Pypi.

ST

I write here about programming, how to program better, things I think are neat and are related to programming. I might write other things at my personal website.

I am happily employed by the excellent Caktus Group, located in beautiful and friendly Carrboro, NC, where I work with Python, Django, and Javascript.