Get info from a PKGBUILD file by calling makepkg --printsrcinfo and parsing the output

parse_srcinfo.py

#!/usr/bin/env python3

import json
import sys
from subprocess import CalledProcessError, run

ARRAY_FIELDS = (
    "arch",
    "arch",
    "b2sums",
    "backup",
    "checkdepends",
    "conflicts",
    "depends",
    "groups",
    "license",
    "makedepends",
    "md5sums",
    "noextract",
    "optdepends",
    "options",
    "provides",
    "replaces",
    "sha1sums",
    "sha224sums",
    "sha256sums",
    "sha384sums",
    "sha512sums",
    "source",
    "validpgpkeys",
)

def parse_srcinfo(srcinfo, array_fields=ARRAY_FIELDS):
    results = {}
    current_package = None

    for line in srcinfo.splitlines():
        line = line.strip()

        if not line or line.startswith("#"):
            continue

        key, value = (x.strip() for x in line.split("=", 1))
        key_noarch = key.split("_", 1)[0]

        if key == "pkgbase":
            info = {}
        elif key == "pkgname":
            if current_package is not None:

                if not "packages" in results:
                    results["packages"] = {}
                results["packages"][current_package] = info
            else:
                results = info

            info = {}
            current_package = value

        if key in info:
            if not isinstance(info[key], list):
                info[key] = [info[key]]

            info[key].append(value)
        elif key_noarch in array_fields:
            info[key] = [value]
        else:
            info[key] = value

    if current_package is not None:
        if not "packages" in results:
            results["packages"] = {}
        results["packages"][current_package] = info

    return results


def get_srcinfo():
    proc = run(["makepkg", "--printsrcinfo"],capture_output=True, env={"LC_ALL": "C"})
    if proc.returncode != 0:
        raise IOError("makepkg returned non-zero exit code: {}".format(proc.stderr.decode("utf-8")))
    else:
        return proc.stdout.decode("utf-8")


def main():
    try:
        srcinfo = get_srcinfo()
    except OSError as exc:
        return str(exc)
    else:
        data = parse_srcinfo(srcinfo)
        print(json.dumps(data, indent=2))


if __name__ == '__main__':
    sys.exit(main() or 0)