Json Command Line Parser

By Big watermelon#6705

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Setup:

Import the jclp module.

import jclp

Initialize the Parser with:

• file(s) which contains your commands
• then the globals() of your script

parser = jclp.Parser(open('commands.json'), globals())

Finally process the command line that you want to run for example sys.argv:

parser.process(sys.argv[1:])
# the first value is the file name so we ignore it

• Full code:

import sys
import jclp

parser = jclp.Parser(open('commands.json'), globals())

print(parser.process(sys.argv[1:]))

Commands:

Commands blocks.

key	type	contains
description	Optional[str]	The command description
commands	dict	Other commands

Runable commands are the one with a return key (and not a commands key).

key	type	contains
description	Optional[str]	The command description
args	Optional[List[Union[str, dict]]]	Arguments of the command
return	str	The returned value

• Examples:

{
    "multiply": {
        "args": [
            {"name": "a", "type": "int"},
            {"name": "b", "type": "int"}
        ],
        "return": "<a> * <b>"
    }
}

>>> multiply 4 8
32

---

{
    "say-hello-to": {
        "description": "say hello to someone !",
        "commands": {
            "James": {"return": "hello James !"},
            "Brian": {"return": "hello Brian !"},
            "Anna": {"return": "hello Anna !"}
        }
    }
}

>>> say-hello-to James
hello James !

>>> say-hello-to Brian
hello Brian !

But this is not optimized !

We can use an arg has the person name.

{
    "say-hello-to": {
        "description": "say hello to someone !",
        "args": ["name"],
        "return": "hello <name> !"
    }
}

And now we just have to do:

>>> say-hello-to Brian
hello Brian !

>>> say-hello-to "Mary Popins"
hello Mary Popins !

---

Arguments:

All the other ones are optionnal. There is no default for opyionnal arguments !

key	type(s)	explaination
type	str	Argument type (automaticly converted)
default	str	The argument default value
reduct	bool	If the argument can be reducted -arg -> -a
check	evaluable sequence	Check the argument (ex: %a > 10)
repr	bool	If the argument is passed as repr or not in the return sequence

---

Special args:

Special args are optionnal and can give you some information on a command, for example:

>>> say-hello-to --description
say hello to someone !

>>> say-hello-to --help

        Help for 'say-hello-to' :
 | Description  : say hello to someone !
 | Arguments    : name
 | Returns      : 'hello <name> !'

 Usage: say-hello-to (s) -name <name> | <name> | -n <name>

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More examples:

You can find more examples of how to use this module here.

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Questions or issues ?

Contact me on discord: Big watermelon#6705