ROX-Filer/src/type.c

   1 /* vi: set cindent:
   2  * $Id$
   3  *
   4  * ROX-Filer, filer for the ROX desktop project
   5  * By Thomas Leonard, <tal197@ecs.soton.ac.uk>.
   6  */
   7
   8 /* type.c - code for dealing with filetypes */
   9
  10 #include <glib.h>
  11 #include <sys/stat.h>
  12 #include <unistd.h>
  13 #include <stdlib.h>
  14 #include <errno.h>
  15 #include <ctype.h>
  16
  17 #include "string.h"
  18 #include "filer.h"
  19 #include "pixmaps.h"
  20 #include "apps.h"
  21 #include "gui_support.h"
  22 #include "choices.h"
  23 #include "type.h"
  24 #include "support.h"
  25 #include "options.h"
  26
  27 /* Static prototypes */
  28 static char *import_extensions(char *line);
  29
  30 /* Maps extensions to MIME_types (eg 'png'-> MIME_type *) */
  31 static GHashTable *extension_hash = NULL;
  32 static char *current_type = NULL;       /* (used while reading file) */
  33
  34 /* Most things on Unix are text files, so this is the default type */
  35 static MIME_type text_plain = {"text", "plain"};
  36
  37 void type_init()
  38 {
  39         char    *path;
  40
  41         extension_hash = g_hash_table_new(g_str_hash, g_str_equal);
  42
  43         path = choices_find_path_load_shared("guess", "MIME-types");
  44         if (path)
  45         {
  46                 current_type = NULL;
  47                 parse_file(path, import_extensions);
  48         }
  49 }
  50
  51 /* Add one entry to the extension_hash table */
  52 static void add_ext(char *type_name, char *ext)
  53 {
  54         MIME_type *new;
  55         char      *slash;
  56         int       len;
  57
  58         slash = strchr(type_name, '/');
  59         g_return_if_fail(slash != NULL);        /* XXX: Report nicely */
  60         len = slash - type_name;
  61
  62         new = g_malloc(sizeof(MIME_type));
  63         new->media_type = g_malloc(sizeof(char) * (len + 1));
  64         memcpy(new->media_type, type_name, len);
  65         new->media_type[len] = '\0';
  66
  67         new->subtype = g_strdup(slash + 1);
  68         new->image = NULL;
  69
  70         g_hash_table_insert(extension_hash, g_strdup(ext), new);
  71 }
  72
  73 /* Parse one line from the file and add entries to extension_hash */
  74 static char *import_extensions(char *line)
  75 {
  76
  77         if (*line == '\0' || *line == '#')
  78                 return NULL;            /* Comment */
  79
  80         if (isspace(*line))
  81         {
  82                 if (!current_type)
  83                         return "Missing MIME-type";
  84                 while (*line && isspace(*line))
  85                         line++;
  86
  87                 if (strncmp(line, "ext:", 4) == 0)
  88                 {
  89                         char *ext;
  90                         line += 4;
  91
  92                         for (;;)
  93                         {
  94                                 while (*line && isspace(*line))
  95                                         line++;
  96                                 if (*line == '\0')
  97                                         break;
  98                                 ext = line;
  99                                 while (*line && !isspace(*line))
 100                                         line++;
 101                                 if (*line)
 102                                         *line++ = '\0';
 103                                 add_ext(current_type, ext);
 104                         }
 105                 }
 106                 /* else ignore */
 107         }
 108         else
 109         {
 110                 char            *type = line;
 111                 while (*line && !isspace(*line))
 112                         line++;
 113                 if (*line)
 114                         *line++ = '\0';
 115                 while (*line && isspace(*line))
 116                         line++;
 117                 if (*line)
 118                         return "Trailing chars after MIME-type";
 119                 current_type = g_strdup(type);
 120         }
 121         return NULL;
 122 }
 123
 124 char *basetype_name(FileItem *item)
 125 {
 126         if (item->flags & ITEM_FLAG_SYMLINK)
 127                 return "Sym link";
 128         else if (item->flags & ITEM_FLAG_MOUNT_POINT)
 129                 return "Mount point";
 130         else if (item->flags & ITEM_FLAG_APPDIR)
 131                 return "App dir";
 132
 133         switch (item->base_type)
 134         {
 135                 case TYPE_FILE:
 136                         return "File";
 137                 case TYPE_DIRECTORY:
 138                         return "Dir";
 139                 case TYPE_CHAR_DEVICE:
 140                         return "Char dev";
 141                 case TYPE_BLOCK_DEVICE:
 142                         return "Block dev";
 143                 case TYPE_PIPE:
 144                         return "Pipe";
 145                 case TYPE_SOCKET:
 146                         return "Socket";
 147         }
 148
 149         return "Unknown";
 150 }
 151
 152 /*                      MIME-type guessing                      */
 153
 154 /* Returns a pointer to the MIME-type string, or NULL if we have
 155  * no opinion.
 156  */
 157 MIME_type *type_from_path(char *path)
 158 {
 159         char    *dot;
 160
 161         dot = strrchr(path, '.');
 162         if (dot)
 163         {
 164                 MIME_type *type;
 165                 type = g_hash_table_lookup(extension_hash, dot + 1);
 166                 if (type)
 167                         return type;
 168         }
 169
 170         return &text_plain;
 171 }
 172
 173 /*                      Actions for types                       */
 174
 175 gboolean type_open(char *path, MIME_type *type)
 176 {
 177         char    *argv[] = {NULL, path, NULL};
 178         char    *open;
 179         char    *type_name;
 180
 181         type_name = g_strconcat(type->media_type, "_", type->subtype, NULL);
 182         open = choices_find_path_load_shared(type_name, "MIME-types");
 183         g_free(type_name);
 184         if (!open)
 185         {
 186                 open = choices_find_path_load_shared(type->media_type,
 187                                 "MIME-types");
 188                 if (!open)
 189                         return FALSE;
 190         }
 191
 192         argv[0] = g_strconcat(open, "/AppRun", NULL);
 193
 194         if (!spawn_full(argv, getenv("HOME"), 0))
 195                 report_error("ROX-Filer",
 196                                 "Failed to fork() child process");
 197
 198         g_free(argv[0]);
 199
 200         return TRUE;
 201 }
 202
 203 /* Tries to load image from <handler>/MIME-icons/<icon>.xpm */
 204 static MaskedPixmap *try_icon_path(GtkWidget *window, char *handler, char *icon)
 205 {
 206         char            *path;
 207         MaskedPixmap    *image;
 208
 209         if (!handler)
 210                 return NULL;
 211
 212         path = g_strconcat(handler, "/MIME-icons/", icon, ".xpm", NULL);
 213         image = load_pixmap_from(window, path);
 214         g_free(path);
 215
 216         return image;
 217 }
 218
 219 /* Return the image for this type, loading it if needed.
 220  * Find handler application, <app>, then:
 221  * Places to check are: (eg type="text_plain", base="text")
 222  * 1. <app>/MIME-icons/<type>
 223  * 2. <app>/MIME-icons/<base>
 224  * 3. $APP_DIR/MIME-icons/<base>
 225  * 4. Unknown type icon.
 226  */
 227 MaskedPixmap *type_to_icon(GtkWidget *window, MIME_type *type)
 228 {
 229         char    *open;
 230         char    *type_name;
 231         MaskedPixmap *i;
 232
 233         g_return_val_if_fail(type != NULL, default_pixmap + TYPE_UNKNOWN);
 234
 235         /* Already got an image? TODO: Is it out-of-date? */
 236         if (type->image)
 237                 return type->image;
 238
 239         type_name = g_strconcat(type->media_type, "_", type->subtype, NULL);
 240
 241         open = choices_find_path_load_shared(type_name, "MIME-types");
 242         if (!open)
 243                 open = choices_find_path_load_shared(type->media_type,
 244                                                         "MIME-types");
 245         if (((i = try_icon_path(window, open, type_name)))
 246          || ((i = try_icon_path(window, open, type->media_type)))
 247          || ((i = try_icon_path(window, getenv("APP_DIR"), type->media_type))))
 248                 type->image = i;
 249         else
 250                 type->image = default_pixmap + TYPE_UNKNOWN;
 251
 252         g_free(type_name);
 253
 254         return i;
 255 }