ROX-Filer/src/type.c

   1 /*
   2  * $Id$
   3  *
   4  * ROX-Filer, filer for the ROX desktop project
   5  * Copyright (C) 2000, Thomas Leonard, <tal197@ecs.soton.ac.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the Free
   9  * Software Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  19  * Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* type.c - code for dealing with filetypes */
  23
  24 #include <glib.h>
  25 #include <sys/stat.h>
  26 #include <unistd.h>
  27 #include <stdlib.h>
  28 #include <errno.h>
  29 #include <ctype.h>
  30 #include <time.h>
  31
  32 #include "string.h"
  33 #include "main.h"
  34 #include "filer.h"
  35 #include "pixmaps.h"
  36 #include "run.h"
  37 #include "gui_support.h"
  38 #include "choices.h"
  39 #include "type.h"
  40 #include "support.h"
  41 #include "options.h"
  42
  43 /* Static prototypes */
  44 static char *import_extensions(guchar *line);
  45
  46 /* Maps extensions to MIME_types (eg 'png'-> MIME_type *) */
  47 static GHashTable *extension_hash = NULL;
  48 static char *current_type = NULL;       /* (used while reading file) */
  49
  50 /* Most things on Unix are text files, so this is the default type */
  51 MIME_type text_plain = {"text", "plain", NULL};
  52
  53 void type_init()
  54 {
  55         ChoicesList     *paths, *next;
  56
  57         extension_hash = g_hash_table_new(g_str_hash, g_str_equal);
  58
  59         paths = choices_find_load_all("guess", "MIME-types");
  60         while (paths)
  61         {
  62                 current_type = NULL;
  63                 parse_file(paths->path, import_extensions);
  64                 next = paths->next;
  65                 g_free(paths->path);
  66                 g_free(paths);
  67                 paths = next;
  68         }
  69 }
  70
  71 /* Add one entry to the extension_hash table */
  72 static void add_ext(char *type_name, char *ext)
  73 {
  74         MIME_type *new;
  75         char      *slash;
  76         int       len;
  77
  78         slash = strchr(type_name, '/');
  79         g_return_if_fail(slash != NULL);        /* XXX: Report nicely */
  80         len = slash - type_name;
  81
  82         new = g_new(MIME_type, 1);
  83         new->media_type = g_malloc(sizeof(char) * (len + 1));
  84         memcpy(new->media_type, type_name, len);
  85         new->media_type[len] = '\0';
  86
  87         new->subtype = g_strdup(slash + 1);
  88         new->image = NULL;
  89
  90         g_hash_table_insert(extension_hash, g_strdup(ext), new);
  91 }
  92
  93 /* Parse one line from the file and add entries to extension_hash */
  94 static char *import_extensions(guchar *line)
  95 {
  96
  97         if (*line == '\0' || *line == '#')
  98                 return NULL;            /* Comment */
  99
 100         if (isspace(*line))
 101         {
 102                 if (!current_type)
 103                         return "Missing MIME-type";
 104                 while (*line && isspace(*line))
 105                         line++;
 106
 107                 if (strncmp(line, "ext:", 4) == 0)
 108                 {
 109                         char *ext;
 110                         line += 4;
 111
 112                         for (;;)
 113                         {
 114                                 while (*line && isspace(*line))
 115                                         line++;
 116                                 if (*line == '\0')
 117                                         break;
 118                                 ext = line;
 119                                 while (*line && !isspace(*line))
 120                                         line++;
 121                                 if (*line)
 122                                         *line++ = '\0';
 123                                 add_ext(current_type, ext);
 124                         }
 125                 }
 126                 /* else ignore */
 127         }
 128         else
 129         {
 130                 char            *type = line;
 131                 while (*line && *line != ':' && !isspace(*line))
 132                         line++;
 133                 if (*line)
 134                         *line++ = '\0';
 135                 while (*line && isspace(*line))
 136                         line++;
 137                 if (*line)
 138                         return "Trailing chars after MIME-type";
 139                 current_type = g_strdup(type);
 140         }
 141         return NULL;
 142 }
 143
 144 char *basetype_name(DirItem *item)
 145 {
 146         if (item->flags & ITEM_FLAG_SYMLINK)
 147                 return "Sym link";
 148         else if (item->flags & ITEM_FLAG_MOUNT_POINT)
 149                 return "Mount point";
 150         else if (item->flags & ITEM_FLAG_APPDIR)
 151                 return "App dir";
 152
 153         switch (item->base_type)
 154         {
 155                 case TYPE_FILE:
 156                         return "File";
 157                 case TYPE_DIRECTORY:
 158                         return "Dir";
 159                 case TYPE_CHAR_DEVICE:
 160                         return "Char dev";
 161                 case TYPE_BLOCK_DEVICE:
 162                         return "Block dev";
 163                 case TYPE_PIPE:
 164                         return "Pipe";
 165                 case TYPE_SOCKET:
 166                         return "Socket";
 167         }
 168
 169         return "Unknown";
 170 }
 171
 172 /*                      MIME-type guessing                      */
 173
 174 /* Returns a pointer to the MIME-type string, or NULL if we have
 175  * no opinion.
 176  */
 177 MIME_type *type_from_path(char *path)
 178 {
 179         char    *dot;
 180
 181         dot = strrchr(path, '.');
 182         if (dot)
 183         {
 184                 MIME_type *type;
 185                 type = g_hash_table_lookup(extension_hash, dot + 1);
 186                 if (type)
 187                         return type;
 188         }
 189
 190         return &text_plain;
 191 }
 192
 193 /*                      Actions for types                       */
 194
 195 gboolean type_open(char *path, MIME_type *type)
 196 {
 197         char    *argv[] = {NULL, NULL, NULL};
 198         char    *open;
 199         char    *type_name;
 200         gboolean        retval = TRUE;
 201         struct stat     info;
 202
 203         argv[1] = path;
 204
 205         type_name = g_strconcat(type->media_type, "_", type->subtype, NULL);
 206         open = choices_find_path_load_shared(type_name, "MIME-types");
 207         g_free(type_name);
 208         if (!open)
 209         {
 210                 open = choices_find_path_load_shared(type->media_type,
 211                                 "MIME-types");
 212                 if (!open)
 213                         return FALSE;
 214         }
 215
 216         if (stat(open, &info))
 217         {
 218                 report_error("ROX-Filer", g_strerror(errno));
 219                 return FALSE;
 220         }
 221
 222         if (S_ISDIR(info.st_mode))
 223                 argv[0] = g_strconcat(open, "/AppRun", NULL);
 224         else
 225                 argv[0] = open;
 226
 227         if (!spawn_full(argv, home_dir))
 228         {
 229                 report_error("ROX-Filer",
 230                                 "Failed to fork() child process");
 231                 retval = FALSE;
 232         }
 233
 234         if (argv[0] != open)
 235                 g_free(argv[0]);
 236
 237         return retval;
 238 }
 239
 240 /* Return the image for this type, loading it if needed.
 241  * Places to check are: (eg type="text_plain", base="text")
 242  * 1. Choices:MIME-icons/<type>
 243  * 2. Choices:MIME-icons/<base>
 244  * 3. Unknown type icon.
 245  *
 246  * Note: You must pixmap_unref() the image afterwards.
 247  */
 248 MaskedPixmap *type_to_icon(MIME_type *type)
 249 {
 250         char    *path;
 251         char    *type_name;
 252         time_t  now;
 253
 254         g_return_val_if_fail(type != NULL, default_pixmap + TYPE_UNKNOWN);
 255
 256         now = time(NULL);
 257         /* Already got an image? */
 258         if (type->image)
 259         {
 260                 /* Yes - don't recheck too often */
 261                 if (abs(now - type->image_time) < 2)
 262                 {
 263                         pixmap_ref(type->image);
 264                         return type->image;
 265                 }
 266                 pixmap_unref(type->image);
 267                 type->image = NULL;
 268         }
 269
 270         type_name = g_strconcat(type->media_type, "_",
 271                                 type->subtype, ".xpm", NULL);
 272         path = choices_find_path_load_shared(type_name, "MIME-icons");
 273         if (!path)
 274         {
 275                 strcpy(type_name + strlen(type->media_type), ".xpm");
 276                 path = choices_find_path_load_shared(type_name, "MIME-icons");
 277         }
 278
 279         g_free(type_name);
 280
 281         if (path)
 282                 type->image = g_fscache_lookup(pixmap_cache, path);
 283
 284         if (!type->image)
 285         {
 286                 type->image = default_pixmap + TYPE_UNKNOWN;
 287                 pixmap_ref(type->image);
 288         }
 289
 290         type->image_time = now;
 291
 292         pixmap_ref(type->image);
 293         return type->image;
 294 }
 295
 296 GdkAtom type_to_atom(MIME_type *type)
 297 {
 298         char    *str;
 299         GdkAtom retval;
 300
 301         g_return_val_if_fail(type != NULL, GDK_NONE);
 302
 303         str = g_strconcat(type->media_type, "/", type->subtype, NULL);
 304         retval = gdk_atom_intern(str, FALSE);
 305         g_free(str);
 306
 307         return retval;
 308 }
 309