brewenv.py

#!/usr/bin/env python3
import argparse
import subprocess
import sys


def scan(formula, keys):
    info = subprocess.check_output(['brew', 'info', formula])
    for line in map(str.strip, info.decode('utf-8').splitlines()):
        for key, target in keys.items():
            if line.startswith('%s: ' % key):
                target.append(line.split(' ', 1)[1].strip())


def run(formulas):
    ldflags = []
    cppflags = []
    pkg_config_paths = []
    for formula in formulas:
        scan(formula, {
            'LDFLAGS': ldflags,
            'CPPFLAGS': cppflags,
            'PKG_CONFIG_PATH': pkg_config_paths
        })
    return ldflags, cppflags, pkg_config_paths


def output(ldflags, cppflags, pkg_config_paths, fobj):
    fobj.write("LDFLAGS='")
    fobj.write(' '.join(ldflags))
    fobj.write("' ")
    fobj.write("CPPFLAGS='")
    fobj.write(' '.join(cppflags))
    fobj.write("' ")
    fobj.write("PKG_CONFIG_PATH='")
    fobj.write(':'.join(pkg_config_paths))
    fobj.write("'")
    

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('formulas', nargs='+')
    args = parser.parse_args()
    ldflags, cppflags, pkg_config_paths = run(args.formulas)
    output(ldflags, cppflags, pkg_config_paths, sys.stdout)

if __name__ == '__main__':
    main()