#
# SWIG interface generator
#
# N. Devillard - March 2000
#
# This script does the following:
#
# - Parse all header files included in ../include/eclipse.h to find
# out which symbols need to be exported to Python.
# - Add definitions from qfits.i
# - Create an interface file to SWIG from that: c_eclipse.i
# - Run SWIG on the interface file to generate c_eclipse_wrap.c
#
# The recognized tokens in header files are:
# Start:   any line containing '<python>'
# Stop :   any line containing '</python>'
# All the code in between these lines (not including them) is
# reproduced in the generated c_eclipse.i file.
#

import string, os

elib = '../../../src/'

def get_qfits_dir(conf_make):
    lines = open(conf_make, 'r').readlines()
    for line in lines:
        key, val = line.split('=')
        if key.strip() == 'QFITSDIR':
            return val.strip()
        
qlib = get_qfits_dir('../../../config.make')

def parse_eclipse_h(pathname):
    print 'Parsing eclipse.h ...'
    lines = open(os.path.join(pathname, 'eclipse.h'), 'r').readlines()

    include_files = []
    for line in lines:
        if line[:8] == '#include':
            filename = line[8:].strip().replace('"', '')
            include_files.append(os.path.join(pathname, filename))
    return include_files

def parse_include(filename):
    lines = open(filename, 'r').readlines()
    new_lines = []
    do_append = 0
    for line in lines:
        if line.find('</python>') != -1:
            do_append = 0
        if do_append:
            new_lines.append(line)
        if line.find('<python>') != -1:
            do_append = 1
    return new_lines
    

def build_interface():
    output_name = 'c_eclipse.i'

    interface = open(output_name, 'w')
    interface.write("""
/*
 * This file is automatically generated!
 * Modifications will be lost.
 */
%module c_eclipse
%{
#include "eclipse.h"
#include "qfits.h"
#include <sys/stat.h>
#include <sys/types.h>
%}

%include etypemaps.i
%include qfits.i

""")
    include_files = parse_eclipse_h(os.path.join(elib, 'include'))
    for filename in include_files:
        lines = parse_include(filename)
        for line in lines:
            interface.write(line)

    interface.close()
    print 'done'


def apply_swig():
    print 'Applying SWIG...'
    os.system('swig -python c_eclipse.i')
    print 'done'

def cleanup():
    print 'Cleaning up'
    try:
        # os.remove('c_eclipse.i')
        os.remove('c_eclipse_wrap.doc')
    except OSError:
        pass

if __name__ == '__main__':
    build_interface()
    apply_swig()
    cleanup()