#!/usr/bin/env python

""" Compute the dependencies of a swig file by running swig.
"""

import sys
from optparse import OptionParser
import os.path
import tools
import subprocess


parser = OptionParser()
parser.add_option("-n", "--name",
                  dest="name", help="The name of the module.")
parser.add_option("-s", "--swig",
                  dest="swig", default="swig", help="The name of the swig command.")
parser.add_option("-p", "--swigpath",
                  dest="swigpath", help="The swig include path.")
parser.add_option("-i", "--includepath",
                  dest="includepath", help="The incluepath.")
parser.add_option("-b", "--build_system",
                  dest="build_system", help="The build system being used.")

def _fix(name, bs):
    if name.startswith("/"):
        return name
    elif bs=="scons":
        return "#/build/"+name
    else:
        return os.path.join(os.getcwd(), "%s")%name

def main():
    (options, args) = parser.parse_args()
    info = tools.get_module_info(options.name, "/")
    if not info["ok"]:
        tools.rewrite("src/%s_swig.deps"%options.name, "")
        return
    cmd = [options.swig, '-MM', '-Iinclude', '-Iswig', '-ignoremissing'] \
          + ["-I"+x for x in tools.split(options.swigpath)] \
          + ["-I"+x for x in tools.split(options.includepath)] \
          + ["swig/IMP_%s.i" % options.name]
    outfile = open("src/%s_swig.deps.in"%options.name, "w")
    ret = subprocess.call(cmd, stdout=outfile)
    outfile.close()
    if ret != 0:
        raise OSError("subprocess failed with return code %d: %s" \
                      % (ret, " ".join(cmd)))
    lines= open("src/%s_swig.deps.in"%options.name, "r").readlines()
    names= [x[:-2].strip() for x in lines[1:]]

    final_names=[_fix(x, options.build_system) for x in names]
    final_list= "\n".join(final_names)
    tools.rewrite("src/%s_swig.deps"%options.name, final_list)



if __name__ == '__main__':
    main()