arclet-alconna 1.7.25

A High-performance, Generality, Humane Command Line Arguments Parser Library.

Alconna

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About

Alconna is a powerful cli tool for parsing message chain or other raw message data. It is an overload version of CommandAnalysis, affiliated to ArcletProject.

Alconna has a large number of built-in components and complex parsing functions. But do not afraid, you can use it as a simple command parser.

Installation

pip

$ pip install --upgrade arclet-alconna
$ pip install --upgrade arclet-alconna[full]

Documentation

Official Document : 👉Link

Relevant Document : 📚Docs

A Simple Example

from arclet.alconna import Alconna, Option, Subcommand, Args

cmd = Alconna(
    "/pip",
    Subcommand("install", Option("-u|--upgrade"), Args.pak_name[str]),
    Option("list")
)

result = cmd.parse("/pip install numpy --upgrade") # This method returns an 'Arparma' class instance.
print(result.query('install'))  # Or result.install

Output as follows:

value=None args={'pak_name': 'numpy'} options={'upgrade': value=Ellipsis args={}} subcommands={}

Communication

QQ Group: Link

Features

• High Performance. On i5-10210U, performance is about 71000~289000 msg/s; test script: benchmark
• Intuitive way to create command components
• Powerful Automatic Type Parse and Conversion
• Customizable Help Text Formatter and Control of Command Analyser
• i18n Support
• Cache of input command for quick response of repeated command
• Easy-to-use Construct and Usage of Command Shortcut
• Can bind callback function to execute after command parsing
• Can create command completion session to implement multi-round continuous completion prompt
• Various Features (FuzzyMatch, Output Capture, etc.)

Example of Callback Executor:

# callback.py
from arclet.alconna import Alconna, Args

alc = Alconna("callback", Args["foo", int]["bar", str])

@alc.bind()
def callback(foo: int, bar: str):
    print(f"foo: {foo}")
    print(f"bar: {bar}")
    print(bar * foo)
    
if __name__ == "__main__":
    alc()

$ python callback.py 3 hello
foo: 3
bar: hello
hellohellohello

Example of Type Conversion:

from arclet.alconna import Alconna, Args
from pathlib import Path

read = Alconna("read", Args["data", bytes])

@read.bind()
def cb(data: bytes):
    print(type(data))

read.parse(["read", b'hello'])
read.parse("read test_fire.py")
read.parse(["read", Path("test_fire.py")])

'''
<class 'bytes'>
<class 'bytes'>
<class 'bytes'>
'''

Example of Component creation:

# component.py
from arclet.alconna import Alconna, Args, Option, Subcommand, store_true, count, append

alc = Alconna(
    "component",
    Args["path", str],
    Option("--verbose|-v", action=count),
    Option("-f", Args["flag", str], compact=True, action=append),
    Subcommand("sub", Option("bar", action=store_true, default=False))
)

if __name__ == '__main__':
    res = alc()
    print(res.query("path"))
    print(res.query("verbose.value"))
    print(res.query("f.flag"))
    print(res.query("sub"))

$ python component.py /home/arclet -vvvv -f1 -f2 -f3 sub bar
/home/arclet
4
['1', '2', '3']
(value=Ellipsis args={} options={'bar': (value=True args={})} subcommands={})

Example of Command Shortcut:

# shortcut.py
from arclet.alconna import Alconna, Args

alc = Alconna("eval", Args["content", str])
alc.shortcut("echo", {"command": "eval print(\\'{*}\\')"})

@alc.bind()
def cb(content: str):
    eval(content, {}, {})

if __name__ == '__main__':
    alc()

$ python shortcut.py eval print(\"hello world\")
hello world
$ python shortcut.py echo hello world!
hello world!

Example of Command Completion:

# completion.py
from arclet.alconna import Alconna, Args, Option

alc = Alconna("complete", Args["bar", int]) + Option("foo") + Option("fool")

if __name__ == "__main__":
    alc()

$ python completion.py ?
suggest input follows:
* bar: int
* --help
* -h
* foo
* fool

Example of typing Support:

from typing import Annotated  # or typing_extensions.Annotated
from arclet.alconna import Alconna, Args

alc = Alconna("test", Args.foo[Annotated[int, lambda x: x % 2 == 0]])
alc.parse("test 2")
alc.parse("test 3")

'''
'foo': 2
ParamsUnmatched: param 3 is incorrect
'''

Example of FuzzyMatch:

# fuzzy.py
from arclet.alconna import Alconna, CommandMeta, Arg

alc = Alconna('!test_fuzzy', Arg("foo", str), meta=CommandMeta(fuzzy_match=True))

if __name__ == "__main__":
    alc()

$ python fuzzy.py /test_fuzzy foo bar
/test_fuzy not matched. Are you mean "!test_fuzzy"?

License

Alconna is licensed under the MIT License.

Acknowledgement

JetBrains: Support Authorize for PyCharm