morbin 1.0.0

Base class for creating modules that are bindings for command line tools.

morbin

Base class for creating bindings for command line tools.

Installation

Install with:

pip install morbin

Usage

The easiest way to start is to use the bundled template generator.
The only argument it requires is the name of the program you want to create bindings for.

As an example we'll do Pip.

Running morbin pip in your terminal will produce a file named pip.py in your current directory.
It should look like this:

from morbin import Morbin, Output


class Pip(Morbin):
    @property
    def program(self) -> str:
    return "pip"

Additional functions should be built on top of the run function and return its output.

After adding functions for install and upgrade the class should look like this:

from morbin import Morbin, Output


class Pip(Morbin):
    @property
    def program(self) -> str:
    return "pip"
    
    def install(self, package:str, *args:str)->Output:
        return self.run("install", package, *args)
    
    def upgrade(self, package:str)->Output:
        return self.install(package, "--upgrade")
    
    def install_requirements(self)->Output:
        return self.install("-r", "requirements.txt")

It can be used like:

pip = Pip()
output = pip.install_requirements()

The Output object each function returns is a dataclass with three fields: return_code, stdout, and stderr.

@dataclass
class Output:
    """Dataclass representing the output of a terminal command.

    #### Fields:
    * `return_code: list[int]`
    * `stdout: str`
    * `stderr: str`"""

    return_code: list[int]
    stdout: str = ""
    stderr: str = ""

    def __add__(self, output: Self) -> Self:
        return Output(
            self.return_code + output.return_code,
            self.stdout + output.stdout,
            self.stderr + output.stderr,
        )

By default stdout and stderr are not captured.
They are sent to wherever they normally would be and the stdout and stderr fields of the Output object will be empty strings.
stdout and stderr can be captured by either setting the capture_output property of a class instance to True or by using the capturing_output context manager.
To get the output of install_requirements:

pip = Pip(capture_output=True)
text = pip.install_requirements().stdout

or

pip = Pip()
with pip.capturing_output():
    text = pip.install_requirements().stdout