#!/usr/bin/env python

"""
Compile a Python script into an executable that embeds CPython and run it.
Requires CPython to be built as a shared library ('libpythonX.Y').

Basic usage:

    python cythonrun somefile.py [ARGS]
"""

DEBUG = True

import sys
import os
import subprocess
from distutils import sysconfig

INCDIR = sysconfig.get_python_inc()
LIBDIR1 = sysconfig.get_config_var('LIBDIR')
LIBDIR2 = sysconfig.get_config_var('LIBPL')
PYLIB = sysconfig.get_config_var('LIBRARY')[3:-2]

CC = sysconfig.get_config_var('CC')
CFLAGS = sysconfig.get_config_var('CFLAGS') + ' ' + os.environ.get('CFLAGS', '')
LINKCC = sysconfig.get_config_var('LINKCC')
LINKFORSHARED = sysconfig.get_config_var('LINKFORSHARED')
LIBS = sysconfig.get_config_var('LIBS')
SYSLIBS = sysconfig.get_config_var('SYSLIBS')

if DEBUG:
    print('INCDIR: %s' % INCDIR)
    print('LIBDIR1: %s' % LIBDIR1)
    print('LIBDIR2: %s' % LIBDIR2)
    print('PYLIB: %s' % PYLIB)

def runcmd(cmd, shell=True):
    if shell:
        cmd = ' '.join(cmd)
        if DEBUG:
            print(cmd)
    else:
        if DEBUG:
            print(' '.join(cmd))

    returncode = subprocess.call(cmd, shell=shell)
    if returncode:
        sys.exit(returncode)

def clink(basename):
    runcmd([LINKCC, '-o', basename, basename+'.o', '-L'+LIBDIR1, '-L'+LIBDIR2, '-l'+PYLIB]
           + LIBS.split() + SYSLIBS.split() + LINKFORSHARED.split())

def ccompile(basename):
    runcmd([CC, '-c', '-o', basename+'.o', basename+'.c', '-I' + INCDIR] + CFLAGS.split())

def cycompile(input_file, options=()):
    from Cython.Compiler import Version, CmdLine, Main
    options, sources = CmdLine.parse_command_line(list(options or ()) + ['--embed', input_file])
    if DEBUG:
        print('Using Cython %s to compile %s' % (Version.version, input_file))
    result = Main.compile(sources, options)
    if result.num_errors > 0:
        sys.exit(1)

def exec_file(basename, args=()):
    runcmd([os.path.abspath(basename)] + list(args), shell=False)

def main(args):
    cy_args = []
    for i, arg in enumerate(args):
        if arg.startswith('-'):
            cy_args.append(arg)
        else:
            input_file = arg
            args = args[i+1:]
            break
    else:
        raise ValueError('no input file provided')
    basename = os.path.splitext(input_file)[0]
    cycompile(input_file, cy_args)
    ccompile(basename)
    clink(basename)
    exec_file(basename, args)

if __name__ == '__main__':
    main(sys.argv[1:])