demo/demo.c

   1 /* ADG - Automatic Drawing Generation
   2  * Copyright (C) 2007-2015  Nicola Fontana <ntd at entidi.it>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA  02110-1301, USA.
  18  */
  19
  20 #include "demo.h"
  21 #include <string.h>
  22
  23
  24 /* Whether the program is running installed or uninstalled */
  25 gboolean is_installed = TRUE;
  26
  27 /* The base directory where all files must be referred,
  28  * usually left unset _adg_init() on POSIX systems. */
  29 gchar *basedir = NULL;
  30
  31
  32 void
  33 _demo_init(gint argc, gchar *argv[])
  34 {
  35     gchar  *name;
  36
  37     if (argc < 1 || argv == NULL || argv[0] == NULL) {
  38         g_error(_("Invalid arguments: arg[0] not set"));
  39         g_assert_not_reached();
  40     }
  41
  42     name = g_path_get_basename(argv[0]);
  43     if (name != NULL) {
  44         is_installed = strstr(name, "uninstalled") == NULL;
  45         g_free(name);
  46     }
  47
  48     basedir = g_path_get_dirname(argv[0]);
  49     if (basedir == NULL)
  50         basedir = g_strdup("");
  51 }
  52
  53 gchar *
  54 _demo_file(const gchar *file_name)
  55 {
  56     static gchar *pkg_data_dir = NULL;
  57
  58     if (! is_installed) {
  59         /* Running uninstalled: look up the file in BUILDDIR before and
  60          * in SRCDIR after, returning the first match */
  61         return adg_find_file(file_name, BUILDDIR, SRCDIR, NULL);
  62     }
  63
  64     /* Otherwise, look up the file only in PKGDATADIR */
  65     if (pkg_data_dir == NULL) {
  66 #ifdef G_OS_WIN32
  67         /* On windows, PKGDATADIR is relative to basedir */
  68         pkg_data_dir = g_build_filename(basedir, PKGDATADIR, NULL);
  69 #else
  70         pkg_data_dir = g_strdup(PKGDATADIR);
  71 #endif
  72     }
  73
  74     return adg_find_file(file_name, pkg_data_dir, NULL);
  75 }