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A framework to write CLI projects.

Project description

This is documentation refering to this Repository

cli_framework

A Framework to make it easier for myself to develop small cli apps

Install

This project can be installed using pip:

pip3 install CLI-csdummi

An example implementation

To implement your own CLI app with this library you have to import the class CLI like this:

from CLI.CLI import CLI

Then you define a class that inherits from CLI and define __init__ like this:

class App(CLI):
  def __init__(self):
    super().__init__('app.json','add','remove','list')

The __init__ Function from CLI takes one positional argument file or in this case 'app.json'. This is the file where the variable self.state is loaded from and saved to before and after execution. You can thus modify self.state like any dict and then it will be saved afterwards. The other arguments are the names of methods you want to be accessed from the command-line. These names must be members of the class App in this case. This means you now have to implement these functions:

  def add(self,args):
    name = args[0]
    balance = args[1]
    self.state[name] = balance

  def remove(self,args):
    name = args[0]
    del self.state[name]

  def list(self,*args):
    for i in self.state.keys():
      print("Name: {}\nBalance: {}".format(i,self.state[i]))

As you can see the names of the methods and the arguments in __init__.

You can now use your CLI App like this:

$ python3 App.py add <name> <balance>
$ python3 App.py remove <name>
$ python3 App.py list
$ python3 App.py help
$ python3 App.py

You can execute these commands right now, all code here was written in the file App.py in this Repository.

help == ''

If there is no command, the help function, that was inherited from CLI is executed, it prints the docstring of self: self.__doc__. If you want usage information for your CLI App to appear, you just write the usage or help into the docstring like this:

class App(CLI):
  """
  Usage:
  add <name> <balance>\t:Add new user
  remove <name>\t:Remove user
  list:\tList all current users
  help:\tDisplay this help
  """
  ...

Then you can use execute the CLI with this:

if __name__ == '__main__':
  app = App() # Create Instance of CLI App
  app.run() # Execute Commandline Parsing

I hope this helped you and you can implement your own CL Apps or interfaces soon.

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