/* Remove, select or merge duplicate translations.
   Copyright (C) 2001-2002 Free Software Foundation, Inc.
   Written by Bruno Haible <haible@clisp.cons.org>, 2001.

   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 2, 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */


#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <getopt.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <locale.h>

#include "dir-list.h"
#include "str-list.h"
#include "error.h"
#include "progname.h"
#include "basename.h"
#include "message.h"
#include "read-po.h"
#include "write-po.h"
#include "msgl-cat.h"
#include "exit.h"
#include "gettext.h"

#define _(str) gettext (str)


/* Force output of PO file even if empty.  */
static int force_po;

/* Target encoding.  */
static const char *to_code;

/* Long options.  */
static const struct option long_options[] =
{
  { "add-location", no_argument, &line_comment, 1 },
  { "directory", required_argument, NULL, 'D' },
  { "escape", no_argument, NULL, 'E' },
  { "force-po", no_argument, &force_po, 1 },
  { "help", no_argument, NULL, 'h' },
  { "indent", no_argument, NULL, 'i' },
  { "no-escape", no_argument, NULL, 'e' },
  { "no-location", no_argument, &line_comment, 0 },
  { "no-wrap", no_argument, NULL, CHAR_MAX + 2 },
  { "output-file", required_argument, NULL, 'o' },
  { "repeated", no_argument, NULL, 'd' },
  { "sort-by-file", no_argument, NULL, 'F' },
  { "sort-output", no_argument, NULL, 's' },
  { "strict", no_argument, NULL, 'S' },
  { "to-code", required_argument, NULL, 't' },
  { "unique", no_argument, NULL, 'u' },
  { "use-first", no_argument, NULL, CHAR_MAX + 1 },
  { "version", no_argument, NULL, 'V' },
  { "width", required_argument, NULL, 'w', },
  { NULL, 0, NULL, 0 }
};


/* Prototypes for local functions.  Needed to ensure compiler checking of
   function argument counts despite of K&R C function definition syntax.  */
static void usage PARAMS ((int status));


int
main (argc, argv)
     int argc;
     char **argv;
{
  int optchar;
  bool do_help;
  bool do_version;
  char *output_file;
  const char *input_file;
  string_list_ty *file_list;
  msgdomain_list_ty *result;
  bool sort_by_msgid = false;
  bool sort_by_filepos = false;

  /* Set program name for messages.  */
  set_program_name (argv[0]);
  error_print_progname = maybe_print_progname;

#ifdef HAVE_SETLOCALE
  /* Set locale via LC_ALL.  */
  setlocale (LC_ALL, "");
#endif

  /* Set the text message domain.  */
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  /* Set default values for variables.  */
  do_help = false;
  do_version = false;
  output_file = NULL;
  input_file = NULL;
  more_than = 0;
  less_than = INT_MAX;
  use_first = false;

  while ((optchar = getopt_long (argc, argv, "dD:eEFhino:st:uVw:",
				 long_options, NULL)) != EOF)
    switch (optchar)
      {
      case '\0':		/* Long option.  */
	break;

      case 'd':
        more_than = 1;
	less_than = INT_MAX;
	break;

      case 'D':
	dir_list_append (optarg);
	break;

      case 'e':
	message_print_style_escape (false);
	break;

      case 'E':
	message_print_style_escape (true);
	break;

      case 'F':
	sort_by_filepos = true;
        break;

      case 'h':
	do_help = true;
	break;

      case 'i':
	message_print_style_indent ();
	break;

      case 'n':
	line_comment = 1;
	break;

      case 'o':
	output_file = optarg;
	break;

      case 's':
	sort_by_msgid = true;
	break;

      case 'S':
	message_print_style_uniforum ();
	break;

      case 't':
	to_code = optarg;
	break;

      case 'u':
        more_than = 0;
	less_than = 2;
        break;

      case 'V':
	do_version = true;
	break;

      case 'w':
	{
	  int value;
	  char *endp;
	  value = strtol (optarg, &endp, 10);
	  if (endp != optarg)
	    message_page_width_set (value);
	}
	break;

      case CHAR_MAX + 1:
	use_first = true;
	break;

      case CHAR_MAX + 2: /* --no-wrap */
	message_page_width_ignore ();
	break;

      default:
	usage (EXIT_FAILURE);
	/* NOTREACHED */
      }

  /* Version information requested.  */
  if (do_version)
    {
      printf ("%s (GNU %s) %s\n", basename (program_name), PACKAGE, VERSION);
      /* xgettext: no-wrap */
      printf (_("Copyright (C) %s Free Software Foundation, Inc.\n\
This is free software; see the source for copying conditions.  There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"),
	      "2001-2002");
      printf (_("Written by %s.\n"), "Bruno Haible");
      exit (EXIT_SUCCESS);
    }

  /* Help is requested.  */
  if (do_help)
    usage (EXIT_SUCCESS);

  /* Test whether we have an .po file name as argument.  */
  if (optind == argc)
    input_file = "-";
  else if (optind + 1 == argc)
    input_file = argv[optind];
  else
    {
      error (EXIT_SUCCESS, 0, _("at most one input file allowed"));
      usage (EXIT_FAILURE);
    }

  /* Verify selected options.  */
  if (!line_comment && sort_by_filepos)
    error (EXIT_FAILURE, 0, _("%s and %s are mutually exclusive"),
	   "--no-location", "--sort-by-file");

  if (sort_by_msgid && sort_by_filepos)
    error (EXIT_FAILURE, 0, _("%s and %s are mutually exclusive"),
	   "--sort-output", "--sort-by-file");

  /* Determine list of files we have to process: a single file.  */
  file_list = string_list_alloc ();
  string_list_append (file_list, input_file);

  /* Read input files, then filter, convert and merge messages.  */
  allow_duplicates = true;
  result = catenate_msgdomain_list (file_list, to_code);

  string_list_free (file_list);

  /* Sorting the list of messages.  */
  if (sort_by_filepos)
    msgdomain_list_sort_by_filepos (result);
  else if (sort_by_msgid)
    msgdomain_list_sort_by_msgid (result);

  /* Write the PO file.  */
  msgdomain_list_print (result, output_file, force_po, false);

  exit (EXIT_SUCCESS);
}


/* Display usage information and exit.  */
static void
usage (status)
     int status;
{
  if (status != EXIT_SUCCESS)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      /* xgettext: no-wrap */
      printf (_("\
Usage: %s [OPTION] [INPUTFILE]\n\
"), program_name);
      printf ("\n");
      /* xgettext: no-wrap */
      printf (_("\
Unifies duplicate translations in a translation catalog.\n\
Finds duplicate translations of the same message ID.  Such duplicates are\n\
invalid input for other programs like msgfmt, msgmerge or msgcat.  By\n\
default, duplicates are merged together.  When using the --repeated option,\n\
only duplicates are output, and all other messages are discarded.  Comments\n\
and extracted comments will be cumulated, except that if --use-first is\n\
specified, they will be taken from the first translation.  File positions\n\
will be cumulated.  When using the --unique option, duplicates are discarded.\n\
"));
      printf ("\n");
      /* xgettext: no-wrap */
      printf (_("\
Mandatory arguments to long options are mandatory for short options too.\n\
"));
      printf ("\n");
      /* xgettext: no-wrap */
      printf (_("\
Input file location:\n\
  INPUTFILE                   input PO file\n\
  -D, --directory=DIRECTORY   add DIRECTORY to list for input files search\n\
If no input file is given or if it is -, standard input is read.\n\
"));
      printf ("\n");
      /* xgettext: no-wrap */
      printf (_("\
Output file location:\n\
  -o, --output-file=FILE         write output to specified file\n\
The results are written to standard output if no output file is specified\n\
or if it is -.\n\
"));
      printf ("\n");
      /* xgettext: no-wrap */
      printf (_("\
Message selection:\n\
  -d, --repeated                 print only duplicates\n\
  -u, --unique                   print only unique messages, discard duplicates\n\
"));
      printf ("\n");
      /* xgettext: no-wrap */
      printf (_("\
Output details:\n\
  -t, --to-code=NAME             encoding for output\n\
      --use-first                use first available translation for each\n\
                                 message, don't merge several translations\n\
  -e, --no-escape                do not use C escapes in output (default)\n\
  -E, --escape                   use C escapes in output, no extended chars\n\
      --force-po                 write PO file even if empty\n\
  -i, --indent                   write the .po file using indented style\n\
      --no-location              do not write '#: filename:line' lines\n\
  -n, --add-location             generate '#: filename:line' lines (default)\n\
      --strict                   write out strict Uniforum conforming .po file\n\
  -w, --width=NUMBER             set output page width\n\
      --no-wrap                  do not break long message lines, longer than\n\
                                 the output page width, into several lines\n\
  -s, --sort-output              generate sorted output\n\
  -F, --sort-by-file             sort output by file location\n\
"));
      printf ("\n");
      /* xgettext: no-wrap */
      printf (_("\
Informative output:\n\
  -h, --help                     display this help and exit\n\
  -V, --version                  output version information and exit\n\
"));
      printf ("\n");
      fputs (_("Report bugs to <bug-gnu-gettext@gnu.org>.\n"),
	     stdout);
    }

  exit (status);
}

