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A dynamic extensible CMD based command shell

Project description

Cloudmesh cmd5

DOI Version License Python Format Format Travis

Installation and Documentation

Please note that several packages are available which are pointed to in the installation documentation.

Links
Documentation https://cloudmesh.github.io/cloudmesh-cloud
Code https://github.com/cloudmesh/cloudmesh-cloud
Installation Instructions https://github.com/cloudmesh/get

An dynamically extensible CMD based command shell. For en extensive documentation please see

where we also document how to use pyenv virtualenv.

Requirements

  • Python greater equal 3.8.1

Cloudmesh was able to run on earlier versions of python, but we do prefer to test it on the newest version.

We recommend that you use venv first before you install cloudmesh. This

You can as user install cmd5 with

pip install cloudemsh-cmd5

Developers should look at our cloudmesh manual.

CMD5 Shell and Commandline

to run the shell you can activate it with the cms command. cms stands for cloudmesh shell::

$ cms

It will print the banner and enter the shell::

+-------------------------------------------------------+
|   ____ _                 _                     _      |
|  / ___| | ___  _   _  __| |_ __ ___   ___  ___| |__   |
| | |   | |/ _ \| | | |/ _` | '_ ` _ \ / _ \/ __| '_ \  |
| | |___| | (_) | |_| | (_| | | | | | |  __/\__ \ | | | |
|  \____|_|\___/ \__,_|\__,_|_| |_| |_|\___||___/_| |_| |
+-------------------------------------------------------+
|                  Cloudmesh CMD5 Shell                 |
+-------------------------------------------------------+

cms>

To see the list of commands you can say::

cms> help

To see the manual page for a specific command, please use::

help COMMANDNAME

CMD 5 Plugin Mechanism

Cmd5 comes with a sophisticated plugin mechanism. Commands can be readily designed from the sys command.

The sys command can be installed either from source (as discussed previously) or via pip

$ pip install cloudmesh-sys

Once you have installed it, execute cms help sys to see the usage. Now you simply can in a new directory execute the sys command as follows, where mycommnad is than name of the command you like to implement.

$ mkdir mycommand
$ cd mycommand
$ cms sys command generate mycommand

A directory with the name cloudmesh-mycommand will be generated that contains the template for the command. You can enter this template and modify the implementation in the folders cloudmesh/mycommand/api and cloudmesh/mycommand/command when installing it with

$ pip install .

The command will be added to the cms command>

An example for the bar command is presented at:

It shows how simple the command definition is (bar.py)::

from __future__ import print_function
from cloudmesh.shell.command import command
from cloudmesh.shell.command import PluginCommand

class BarCommand(PluginCommand):

    @command
    def do_bar(self, args, arguments):
        """
        ::

          Usage:
                command -f FILE
                command FILE
                command list
          This command does some useful things.
          Arguments:
              FILE   a file name
          Options:
              -f      specify the file
        """
        print(arguments)

An important difference to other CMD solutions is that our commands can leverage (besides the standard definition), docopts as a way to define the manual page. This allows us to use arguments as dict and use simple if conditions to interpret the command. Using docopts has the advantage that contributors are forced to think about the command and its options and document them from the start. Previously we used not to use docopts and argparse was used. However we noticed that for some contributions the lead to commands that were either not properly documented or the developers delivered ambiguous commands that resulted in confusion and wrong usage by the users. Hence, we do recommend that you use docopts.

The transformation is enabled by the @command decorator that takes also the manual page and creates a proper help message for the shell automatically. Thus there is no need to introduce a separate help method as would normally be needed in CMD.

Features

The following highlighted features are available:

Changes

  • added support for terminals with dark background

  • addes support for python in variable assignments

    cms set a=\"py 1 + 1\"
    a='2'
    
  • added support for executing python in a py command

    cms py 1 + 1
    2
    
  • added support for shell commands in the variabe value

    cms set a=\!pwd
    
  • added support for reading values from a yaml configuration file in ~/.cloudmesh/cloudmesh.yaml

    cms set a=cloudmesh.profile.user
    

    where it is defined as

    cloudmesh:
      profile:
        user: gregor
    

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