import os
import sys
from distutils.core import setup, Extension

# --with-zlib: use zlib for compressing and decompressing
# --without-zlib: ^ negated
# --with-zlib=<dir>: path to zlib if needed
# --with-libmemcached=<dir>: path to libmemcached package if needed

cmd = None
use_zlib = True
pkgdirs = []  # incdirs and libdirs get these
libs = ["memcached"]
defs = []
incdirs = []
libdirs = []

def append_env(L, e):
    v = os.environ.get(e)
    if v and os.path.exists(v):
        L.append(v)

append_env(pkgdirs, "LIBMEMCACHED")
append_env(pkgdirs, "ZLIB")

# Hack up sys.argv, yay
unprocessed = []
for arg in sys.argv[1:]:
    if arg == "--with-zlib":
        use_zlib = True
        continue
    elif arg == "--without-zlib":
        use_zlib = False
        continue
    elif arg == "--gen-setup":
        cmd = arg[2:]
    elif "=" in arg:
        if arg.startswith("--with-libmemcached=") or \
           arg.startswith("--with-zlib="):
            pkgdirs.append(arg.split("=", 1)[1])
            continue
    unprocessed.append(arg)
sys.argv[1:] = unprocessed

for pkgdir in pkgdirs:
    incdirs.append(os.path.join(pkgdir, "include"))
    libdirs.append(os.path.join(pkgdir, "lib"))

if use_zlib:
    libs.append("z")
    defs.append(("USE_ZLIB", None))
 
pylibmc_ext = Extension("_pylibmc", ["_pylibmcmodule.c"],
                        libraries=libs, include_dirs=incdirs,
                        library_dirs=libdirs, define_macros=defs)

# Hidden secret: if environment variable GEN_SETUP is set, generate Setup file.
if cmd == "gen-setup":
    line = " ".join((
        pylibmc_ext.name,
        " ".join("-l" + lib for lib in pylibmc_ext.libraries),
        " ".join("-I" + incdir for incdir in pylibmc_ext.include_dirs),
        " ".join("-L" + libdir for libdir in pylibmc_ext.library_dirs),
        " ".join("-D" + name + ("=" + str(value), "")[value is None] for (name, value) in pylibmc_ext.define_macros)))
    open("Setup", "w").write(line + "\n")
    sys.exit(0)

readme_text = open("README.rst", "U").read()
version = open("pylibmc-version.h", "U").read().strip().split("\"")[1]

setup(name="pylibmc", version=version,
      url="http://sendapatch.se/projects/pylibmc/",
      author="Ludvig Ericson", author_email="ludvig@lericson.se",
      license="3-clause BSD <http://www.opensource.org/licenses/bsd-license.php>",
      description="Quick and small memcached client for Python",
      long_description=readme_text,
      ext_modules=[pylibmc_ext], packages=["pylibmc"])