#!/usr/bin/python

#

# Simple utility script to generate the basic info

# needed in a .pc (pkg-config) file, used especially

# for introspection purposes

# This can be used in various projects where

# there is the need to generate .pc files,

# and is copied from GLib's $(srcroot)/build/win32

# Author: Fan, Chun-wei

# Date: March 10, 2016

import os

import sys

import argparse

class BasePCItems:

    def __init__(self):

        self.base_replace_items = {}

        self.exec_prefix = ''

        self.includedir = ''

        self.libdir = ''

        self.prefix = ''

        self.srcdir = os.path.dirname(__file__)

        self.top_srcdir = self.srcdir + '\\..\\..'

        self.version = ''

    def setup(self, argv, parser=None):

        if parser is None:

            parser = argparse.ArgumentParser(description='Setup basic .pc file info')

        parser.add_argument('--prefix', help='prefix of the installed library',

                            required=True)

        parser.add_argument('--exec-prefix',

                            help='prefix of the installed programs, \

                                  if different from the prefix')

        parser.add_argument('--includedir',

                            help='includedir of the installed library, \

                                  if different from ${prefix}/include')

        parser.add_argument('--libdir',

                            help='libdir of the installed library, \

                                  if different from ${prefix}/lib')

        parser.add_argument('--version', help='Version of the package',

                            required=True)

        args = parser.parse_args()

        self.version = args.version

        # check whether the prefix and exec_prefix are valid

        if not os.path.exists(args.prefix):

            raise SystemExit('Specified prefix \'%s\' is invalid' % args.prefix)

        # use absolute paths for prefix

        self.prefix = os.path.abspath(args.prefix).replace('\\','/')

        # check and setup the exec_prefix

        if getattr(args, 'exec_prefix', None) is None:

            exec_prefix_use_shorthand = True

            self.exec_prefix = '${prefix}'

        else:

            if args.exec_prefix.startswith('${prefix}'):

                exec_prefix_use_shorthand = True

                input_exec_prefix = args.prefix + args.exec_prefix[len('${prefix}'):]

            else:

                exec_prefix_use_shorthand = False

                input_exec_prefix = args.exec_prefix

            if not os.path.exists(input_exec_prefix):

                raise SystemExit('Specified exec_prefix \'%s\' is invalid' %

                                  args.exec_prefix)

            if exec_prefix_use_shorthand is True:

                self.exec_prefix = args.exec_prefix.replace('\\','/')

            else:

                self.exec_prefix = os.path.abspath(input_exec_prefix).replace('\\','/')

        # check and setup the includedir

        if getattr(args, 'includedir', None) is None:

            self.includedir = '${prefix}/include'

        else:

            if args.includedir.startswith('${prefix}'):

                includedir_use_shorthand = True

                input_includedir = args.prefix + args.includedir[len('${prefix}'):]

            else:

                if args.includedir.startswith('${exec_prefix}'):

                    includedir_use_shorthand = True

                    input_includedir = input_exec_prefix + args.includedir[len('${exec_prefix}'):]

                else:

                    includedir_use_shorthand = False

                    input_includedir = args.includedir

            if not os.path.exists(input_includedir):

                raise SystemExit('Specified includedir \'%s\' is invalid' %

                                  args.includedir)

            if includedir_use_shorthand is True:

                self.includedir = args.includedir.replace('\\','/')

            else:

                self.includedir = os.path.abspath(input_includedir).replace('\\','/')

        # check and setup the libdir

        if getattr(args, 'libdir', None) is None:

            self.libdir = '${prefix}/lib'

        else:

            if args.libdir.startswith('${prefix}'):

                libdir_use_shorthand = True

                input_libdir = args.prefix + args.libdir[len('${prefix}'):]

            else:

                if args.libdir.startswith('${exec_prefix}'):

                    libdir_use_shorthand = True

                    input_libdir = input_exec_prefix + args.libdir[len('${exec_prefix}'):]

                else:

                    libdir_use_shorthand = False

                    input_libdir = args.libdir

            if not os.path.exists(input_libdir):

                raise SystemExit('Specified libdir \'%s\' is invalid' %

			                      args.libdir)

            if libdir_use_shorthand is True:

                self.libdir = args.libdir.replace('\\','/')

            else:

                self.libdir = os.path.abspath(input_libdir).replace('\\','/')

        # setup dictionary for replacing items in *.pc.in

        self.base_replace_items.update({'@VERSION@': self.version})

        self.base_replace_items.update({'@prefix@': self.prefix})

        self.base_replace_items.update({'@exec_prefix@': self.exec_prefix})

        self.base_replace_items.update({'@libdir@': self.libdir})

        self.base_replace_items.update({'@includedir@': self.includedir})