Show available package updates for Poetry projects

available-package-updates.py

#!/usr/bin/env python
from typing import cast, Dict
import toml
import subprocess


def update_deps(name: str, version: str, t: Dict) -> Dict:
    def update(deps: Dict) -> None:
        for key in deps:
            v = deps[key]
            if type(v) is str and name.lower() == key.lower() and v[0] in ("~", "^"):
                deps[key] = f"{v[0]}{version}"

    update(t['tool']['poetry']['dependencies'])
    update(t['tool']['poetry']['dev-dependencies'])

    return t


with open('./pyproject.toml', 'r') as f:
    t = cast(Dict, toml.loads(f.read()))
    output = subprocess.run(["poetry", "show"], capture_output=True)
    lines = cast(str, output.stdout.decode()).split('\n')

    for line in filter(lambda l: bool(l), lines):
        name, version, *_ = line.split()
        t = update_deps(name, version, t)

    print(toml.dumps(t))