#!/usr/bin/env python3

"""
defcheck.py -- Consistency check for the .def files.
Copyright (C) 2006  Simon Budig <simon@gimp.org>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.


This is a hack to check the consistency of the .def files compared to
the respective libraries.

Invoke in the top level of the gimp source tree after compiling GIMP.
If srcdir != builddir, run it in the build directory and pass the name
of the source directory on the command-line.

Needs the tool "nm" to work

"""

import sys, subprocess

from os import path

def_files = (
   "libgimpbase/gimpbase.def",
   "libgimpcolor/gimpcolor.def",
   "libgimpconfig/gimpconfig.def",
   "libgimp/gimp.def",
   "libgimp/gimpui.def",
   "libgimpmath/gimpmath.def",
   "libgimpmodule/gimpmodule.def",
   "libgimpthumb/gimpthumb.def",
   "libgimpwidgets/gimpwidgets.def"
)

have_errors = 0

srcdir = None
if len(sys.argv) > 1:
   srcdir = sys.argv[1]
   if not path.exists(srcdir):
      print("Directory '%s' does not exist" % srcdir)
      sys.exit (-1)

for df in def_files:
   directory, name = path.split (df)
   basename, extension = name.split (".")
   libname = path.join(directory, "lib" + basename + "-*.so")

   filename = df
   if srcdir:
      filename = path.join(srcdir, df)
   try:
      defsymbols = open (filename).read ().split ()[1:]
   except IOError as message:
      print(message)
      if not srcdir:
         print("You should run this script from the toplevel source directory.")
      sys.exit (-1)

   doublesymbols = []
   for i in range (len (defsymbols)-1, 0, -1):
      if defsymbols[i] in defsymbols[:i]:
         doublesymbols.append ((defsymbols[i], i+2))

   unsortindex = -1
   for i in range (len (defsymbols)-1):
      if defsymbols[i] > defsymbols[i+1]:
         unsortindex = i+1
         break;

   status, nm = subprocess.getstatusoutput ("nm --defined-only --extern-only " +
                                            libname)
   if status != 0:
      print("trouble reading {} - has it been compiled?".format(libname))
      have_errors = -1
      continue

   nmsymbols = nm.split()[2::3]
   nmsymbols = [s for s in nmsymbols if s[0] != '_']

   missing_defs = [s for s in nmsymbols  if s not in defsymbols]
   missing_nms  = [s for s in defsymbols if s not in nmsymbols]

   if unsortindex >= 0 or missing_defs or missing_nms or doublesymbols:
      print()
      print("Problem found in", filename)

      if missing_defs:
         print("  the following symbols are in the library,")
         print("  but are not listed in the .def-file:")
         for s in missing_defs:
            print("     +", s)
         print()

      if missing_nms:
         print("  the following symbols are listed in the .def-file,")
         print("  but are not exported by the library.")
         for s in missing_nms:
            print("     -", s)
         print()

      if doublesymbols:
         print("  the following symbols are listed multiple times in the .def-file,")
         for s in doublesymbols:
            print("     : %s (line %d)" % s)
         print()

      if unsortindex >= 0:
         print("  the .def-file is not properly sorted (line %d)" % (unsortindex + 2))
         print()

      have_errors = -1

sys.exit (have_errors)