git.sur5r.net Git - i3/i3/blob - src/load_layout.c

   1 #undef I3__FILE__
   2 #define I3__FILE__ "load_layout.c"
   3 /*
   4  * vim:ts=4:sw=4:expandtab
   5  *
   6  * i3 - an improved dynamic tiling window manager
   7  * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
   8  *
   9  * load_layout.c: Restore (parts of) the layout, for example after an inplace
  10  *                restart.
  11  *
  12  */
  13 #include "all.h"
  14
  15 #include <yajl/yajl_common.h>
  16 #include <yajl/yajl_gen.h>
  17 #include <yajl/yajl_parse.h>
  18 #include <yajl/yajl_version.h>
  19
  20 /* TODO: refactor the whole parsing thing */
  21
  22 static char *last_key;
  23 static Con *json_node;
  24 static Con *to_focus;
  25 static bool parsing_swallows;
  26 static bool parsing_rect;
  27 static bool parsing_window_rect;
  28 static bool parsing_geometry;
  29 static bool parsing_focus;
  30 struct Match *current_swallow;
  31
  32 /* This list is used for reordering the focus stack after parsing the 'focus'
  33  * array. */
  34 struct focus_mapping {
  35     int old_id;
  36     TAILQ_ENTRY(focus_mapping) focus_mappings;
  37 };
  38
  39 static TAILQ_HEAD(focus_mappings_head, focus_mapping) focus_mappings =
  40   TAILQ_HEAD_INITIALIZER(focus_mappings);
  41
  42 static int json_start_map(void *ctx) {
  43     LOG("start of map, last_key = %s\n", last_key);
  44     if (parsing_swallows) {
  45         LOG("creating new swallow\n");
  46         current_swallow = smalloc(sizeof(Match));
  47         match_init(current_swallow);
  48         TAILQ_INSERT_TAIL(&(json_node->swallow_head), current_swallow, matches);
  49     } else {
  50         if (!parsing_rect && !parsing_window_rect && !parsing_geometry) {
  51             if (last_key && strcasecmp(last_key, "floating_nodes") == 0) {
  52                 DLOG("New floating_node\n");
  53                 Con *ws = con_get_workspace(json_node);
  54                 json_node = con_new_skeleton(NULL, NULL);
  55                 json_node->parent = ws;
  56                 DLOG("Parent is workspace = %p\n", ws);
  57             } else {
  58                 Con *parent = json_node;
  59                 json_node = con_new_skeleton(NULL, NULL);
  60                 json_node->parent = parent;
  61             }
  62         }
  63     }
  64     return 1;
  65 }
  66
  67 static int json_end_map(void *ctx) {
  68     LOG("end of map\n");
  69     if (!parsing_swallows && !parsing_rect && !parsing_window_rect && !parsing_geometry) {
  70         /* Set a few default values to simplify manually crafted layout files. */
  71         if (json_node->layout == L_DEFAULT) {
  72             DLOG("Setting layout = L_SPLITH\n");
  73             json_node->layout = L_SPLITH;
  74         }
  75
  76         LOG("attaching\n");
  77         con_attach(json_node, json_node->parent, true);
  78         LOG("Creating window\n");
  79         x_con_init(json_node, json_node->depth);
  80         json_node = json_node->parent;
  81     }
  82     if (parsing_rect)
  83         parsing_rect = false;
  84     if (parsing_window_rect)
  85         parsing_window_rect = false;
  86     if (parsing_geometry)
  87         parsing_geometry = false;
  88     return 1;
  89 }
  90
  91 static int json_end_array(void *ctx) {
  92     LOG("end of array\n");
  93     if (!parsing_swallows && !parsing_focus) {
  94         con_fix_percent(json_node);
  95     }
  96     if (parsing_swallows) {
  97         parsing_swallows = false;
  98     }
  99     if (parsing_focus) {
 100         /* Clear the list of focus mappings */
 101         struct focus_mapping *mapping;
 102         TAILQ_FOREACH_REVERSE(mapping, &focus_mappings, focus_mappings_head, focus_mappings) {
 103             LOG("focus (reverse) %d\n", mapping->old_id);
 104             Con *con;
 105             TAILQ_FOREACH(con, &(json_node->focus_head), focused) {
 106                 if (con->old_id != mapping->old_id)
 107                     continue;
 108                 LOG("got it! %p\n", con);
 109                 /* Move this entry to the top of the focus list. */
 110                 TAILQ_REMOVE(&(json_node->focus_head), con, focused);
 111                 TAILQ_INSERT_HEAD(&(json_node->focus_head), con, focused);
 112                 break;
 113             }
 114         }
 115         while (!TAILQ_EMPTY(&focus_mappings)) {
 116             mapping = TAILQ_FIRST(&focus_mappings);
 117             TAILQ_REMOVE(&focus_mappings, mapping, focus_mappings);
 118             free(mapping);
 119         }
 120         parsing_focus = false;
 121     }
 122     return 1;
 123 }
 124
 125 #if YAJL_MAJOR < 2
 126 static int json_key(void *ctx, const unsigned char *val, unsigned int len) {
 127 #else
 128 static int json_key(void *ctx, const unsigned char *val, size_t len) {
 129 #endif
 130     LOG("key: %.*s\n", (int)len, val);
 131     FREE(last_key);
 132     last_key = scalloc((len+1) * sizeof(char));
 133     memcpy(last_key, val, len);
 134     if (strcasecmp(last_key, "swallows") == 0)
 135         parsing_swallows = true;
 136
 137     if (strcasecmp(last_key, "rect") == 0)
 138         parsing_rect = true;
 139
 140     if (strcasecmp(last_key, "window_rect") == 0)
 141         parsing_window_rect = true;
 142
 143     if (strcasecmp(last_key, "geometry") == 0)
 144         parsing_geometry = true;
 145
 146     if (strcasecmp(last_key, "focus") == 0)
 147         parsing_focus = true;
 148
 149     return 1;
 150 }
 151
 152 #if YAJL_MAJOR >= 2
 153 static int json_string(void *ctx, const unsigned char *val, size_t len) {
 154 #else
 155 static int json_string(void *ctx, const unsigned char *val, unsigned int len) {
 156 #endif
 157     LOG("string: %.*s for key %s\n", (int)len, val, last_key);
 158     if (parsing_swallows) {
 159         char *sval;
 160         sasprintf(&sval, "%.*s", len, val);
 161         if (strcasecmp(last_key, "class") == 0) {
 162             current_swallow->class = regex_new(sval);
 163         } else if (strcasecmp(last_key, "instance") == 0) {
 164             current_swallow->instance = regex_new(sval);
 165         } else if (strcasecmp(last_key, "window_role") == 0) {
 166             current_swallow->window_role = regex_new(sval);
 167         } else if (strcasecmp(last_key, "title") == 0) {
 168             current_swallow->title = regex_new(sval);
 169         } else {
 170             ELOG("swallow key %s unknown\n", last_key);
 171         }
 172         free(sval);
 173     } else {
 174         if (strcasecmp(last_key, "name") == 0) {
 175             json_node->name = scalloc((len+1) * sizeof(char));
 176             memcpy(json_node->name, val, len);
 177         } else if (strcasecmp(last_key, "sticky_group") == 0) {
 178             json_node->sticky_group = scalloc((len+1) * sizeof(char));
 179             memcpy(json_node->sticky_group, val, len);
 180             LOG("sticky_group of this container is %s\n", json_node->sticky_group);
 181         } else if (strcasecmp(last_key, "orientation") == 0) {
 182             /* Upgrade path from older versions of i3 (doing an inplace restart
 183              * to a newer version):
 184              * "orientation" is dumped before "layout". Therefore, we store
 185              * whether the orientation was horizontal or vertical in the
 186              * last_split_layout. When we then encounter layout == "default",
 187              * we will use the last_split_layout as layout instead. */
 188             char *buf = NULL;
 189             sasprintf(&buf, "%.*s", (int)len, val);
 190             if (strcasecmp(buf, "none") == 0 ||
 191                 strcasecmp(buf, "horizontal") == 0)
 192                 json_node->last_split_layout = L_SPLITH;
 193             else if (strcasecmp(buf, "vertical") == 0)
 194                 json_node->last_split_layout = L_SPLITV;
 195             else LOG("Unhandled orientation: %s\n", buf);
 196             free(buf);
 197         } else if (strcasecmp(last_key, "border") == 0) {
 198             char *buf = NULL;
 199             sasprintf(&buf, "%.*s", (int)len, val);
 200             if (strcasecmp(buf, "none") == 0)
 201                 json_node->border_style = BS_NONE;
 202             else if (strcasecmp(buf, "1pixel") == 0) {
 203                 json_node->border_style = BS_PIXEL;
 204                 json_node->current_border_width = 1;
 205             } else if (strcasecmp(buf, "pixel") == 0)
 206                 json_node->border_style = BS_PIXEL;
 207             else if (strcasecmp(buf, "normal") == 0)
 208                 json_node->border_style = BS_NORMAL;
 209             else LOG("Unhandled \"border\": %s\n", buf);
 210             free(buf);
 211         } else if (strcasecmp(last_key, "type") == 0) {
 212             char *buf = NULL;
 213             sasprintf(&buf, "%.*s", (int)len, val);
 214             if (strcasecmp(buf, "root") == 0)
 215                 json_node->type = CT_ROOT;
 216             else if (strcasecmp(buf, "output") == 0)
 217                 json_node->type = CT_OUTPUT;
 218             else if (strcasecmp(buf, "con") == 0)
 219                 json_node->type = CT_CON;
 220             else if (strcasecmp(buf, "floating_con") == 0)
 221                 json_node->type = CT_FLOATING_CON;
 222             else if (strcasecmp(buf, "workspace") == 0)
 223                 json_node->type = CT_WORKSPACE;
 224             else if (strcasecmp(buf, "dockarea") == 0)
 225                 json_node->type = CT_DOCKAREA;
 226             else LOG("Unhandled \"type\": %s\n", buf);
 227             free(buf);
 228         } else if (strcasecmp(last_key, "layout") == 0) {
 229             char *buf = NULL;
 230             sasprintf(&buf, "%.*s", (int)len, val);
 231             if (strcasecmp(buf, "default") == 0)
 232                 /* This set above when we read "orientation". */
 233                 json_node->layout = json_node->last_split_layout;
 234             else if (strcasecmp(buf, "stacked") == 0)
 235                 json_node->layout = L_STACKED;
 236             else if (strcasecmp(buf, "tabbed") == 0)
 237                 json_node->layout = L_TABBED;
 238             else if (strcasecmp(buf, "dockarea") == 0)
 239                 json_node->layout = L_DOCKAREA;
 240             else if (strcasecmp(buf, "output") == 0)
 241                 json_node->layout = L_OUTPUT;
 242             else if (strcasecmp(buf, "splith") == 0)
 243                 json_node->layout = L_SPLITH;
 244             else if (strcasecmp(buf, "splitv") == 0)
 245                 json_node->layout = L_SPLITV;
 246             else LOG("Unhandled \"layout\": %s\n", buf);
 247             free(buf);
 248         } else if (strcasecmp(last_key, "workspace_layout") == 0) {
 249             char *buf = NULL;
 250             sasprintf(&buf, "%.*s", (int)len, val);
 251             if (strcasecmp(buf, "default") == 0)
 252                 json_node->workspace_layout = L_DEFAULT;
 253             else if (strcasecmp(buf, "stacked") == 0)
 254                 json_node->workspace_layout = L_STACKED;
 255             else if (strcasecmp(buf, "tabbed") == 0)
 256                 json_node->workspace_layout = L_TABBED;
 257             else LOG("Unhandled \"workspace_layout\": %s\n", buf);
 258             free(buf);
 259         } else if (strcasecmp(last_key, "last_split_layout") == 0) {
 260             char *buf = NULL;
 261             sasprintf(&buf, "%.*s", (int)len, val);
 262             if (strcasecmp(buf, "splith") == 0)
 263                 json_node->last_split_layout = L_SPLITH;
 264             else if (strcasecmp(buf, "splitv") == 0)
 265                 json_node->last_split_layout = L_SPLITV;
 266             else LOG("Unhandled \"last_splitlayout\": %s\n", buf);
 267             free(buf);
 268         } else if (strcasecmp(last_key, "mark") == 0) {
 269             char *buf = NULL;
 270             sasprintf(&buf, "%.*s", (int)len, val);
 271             json_node->mark = buf;
 272         } else if (strcasecmp(last_key, "floating") == 0) {
 273             char *buf = NULL;
 274             sasprintf(&buf, "%.*s", (int)len, val);
 275             if (strcasecmp(buf, "auto_off") == 0)
 276                 json_node->floating = FLOATING_AUTO_OFF;
 277             else if (strcasecmp(buf, "auto_on") == 0)
 278                 json_node->floating = FLOATING_AUTO_ON;
 279             else if (strcasecmp(buf, "user_off") == 0)
 280                 json_node->floating = FLOATING_USER_OFF;
 281             else if (strcasecmp(buf, "user_on") == 0)
 282                 json_node->floating = FLOATING_USER_ON;
 283             free(buf);
 284         } else if (strcasecmp(last_key, "scratchpad_state") == 0) {
 285             char *buf = NULL;
 286             sasprintf(&buf, "%.*s", (int)len, val);
 287             if (strcasecmp(buf, "none") == 0)
 288                 json_node->scratchpad_state = SCRATCHPAD_NONE;
 289             else if (strcasecmp(buf, "fresh") == 0)
 290                 json_node->scratchpad_state = SCRATCHPAD_FRESH;
 291             else if (strcasecmp(buf, "changed") == 0)
 292                 json_node->scratchpad_state = SCRATCHPAD_CHANGED;
 293             free(buf);
 294         }
 295     }
 296     return 1;
 297 }
 298
 299 #if YAJL_MAJOR >= 2
 300 static int json_int(void *ctx, long long val) {
 301     LOG("int %lld for key %s\n", val, last_key);
 302 #else
 303 static int json_int(void *ctx, long val) {
 304     LOG("int %ld for key %s\n", val, last_key);
 305 #endif
 306     /* For backwards compatibility with i3 < 4.8 */
 307     if (strcasecmp(last_key, "type") == 0)
 308         json_node->type = val;
 309
 310     if (strcasecmp(last_key, "fullscreen_mode") == 0)
 311         json_node->fullscreen_mode = val;
 312
 313     if (strcasecmp(last_key, "num") == 0)
 314         json_node->num = val;
 315
 316     if (strcasecmp(last_key, "current_border_width") == 0)
 317         json_node->current_border_width = val;
 318
 319     if (strcasecmp(last_key, "depth") == 0)
 320         json_node->depth = val;
 321
 322     if (!parsing_swallows && strcasecmp(last_key, "id") == 0)
 323         json_node->old_id = val;
 324
 325     if (parsing_focus) {
 326         struct focus_mapping *focus_mapping = scalloc(sizeof(struct focus_mapping));
 327         focus_mapping->old_id = val;
 328         TAILQ_INSERT_TAIL(&focus_mappings, focus_mapping, focus_mappings);
 329     }
 330
 331     if (parsing_rect || parsing_window_rect || parsing_geometry) {
 332         Rect *r;
 333         if (parsing_rect)
 334             r = &(json_node->rect);
 335         else if (parsing_window_rect)
 336             r = &(json_node->window_rect);
 337         else r = &(json_node->geometry);
 338         if (strcasecmp(last_key, "x") == 0)
 339             r->x = val;
 340         else if (strcasecmp(last_key, "y") == 0)
 341             r->y = val;
 342         else if (strcasecmp(last_key, "width") == 0)
 343             r->width = val;
 344         else if (strcasecmp(last_key, "height") == 0)
 345             r->height = val;
 346         else ELOG("WARNING: unknown key %s in rect\n", last_key);
 347         DLOG("rect now: (%d, %d, %d, %d)\n",
 348                 r->x, r->y, r->width, r->height);
 349     }
 350     if (parsing_swallows) {
 351         if (strcasecmp(last_key, "id") == 0) {
 352             current_swallow->id = val;
 353         }
 354         if (strcasecmp(last_key, "dock") == 0) {
 355             current_swallow->dock = val;
 356         }
 357         if (strcasecmp(last_key, "insert_where") == 0) {
 358             current_swallow->insert_where = val;
 359         }
 360     }
 361
 362     return 1;
 363 }
 364
 365 static int json_bool(void *ctx, int val) {
 366     LOG("bool %d for key %s\n", val, last_key);
 367     if (strcasecmp(last_key, "focused") == 0 && val) {
 368         to_focus = json_node;
 369     }
 370
 371     if (parsing_swallows) {
 372         if (strcasecmp(last_key, "restart_mode") == 0)
 373             current_swallow->restart_mode = val;
 374     }
 375
 376     return 1;
 377 }
 378
 379 static int json_double(void *ctx, double val) {
 380     LOG("double %f for key %s\n", val, last_key);
 381     if (strcasecmp(last_key, "percent") == 0) {
 382         json_node->percent = val;
 383     }
 384     return 1;
 385 }
 386
 387 void tree_append_json(const char *filename, char **errormsg) {
 388     FILE *f;
 389     if ((f = fopen(filename, "r")) == NULL) {
 390         LOG("Cannot open file \"%s\"\n", filename);
 391         return;
 392     }
 393     struct stat stbuf;
 394     if (fstat(fileno(f), &stbuf) != 0) {
 395         LOG("Cannot fstat() the file\n");
 396         fclose(f);
 397         return;
 398     }
 399     char *buf = smalloc(stbuf.st_size);
 400     int n = fread(buf, 1, stbuf.st_size, f);
 401     if (n != stbuf.st_size) {
 402         LOG("File \"%s\" could not be read entirely, not loading.\n", filename);
 403         fclose(f);
 404         return;
 405     }
 406     LOG("read %d bytes\n", n);
 407     yajl_gen g;
 408     yajl_handle hand;
 409     yajl_callbacks callbacks;
 410     memset(&callbacks, '\0', sizeof(yajl_callbacks));
 411     callbacks.yajl_start_map = json_start_map;
 412     callbacks.yajl_end_map = json_end_map;
 413     callbacks.yajl_end_array = json_end_array;
 414     callbacks.yajl_string = json_string;
 415     callbacks.yajl_map_key = json_key;
 416     callbacks.yajl_integer = json_int;
 417     callbacks.yajl_double = json_double;
 418     callbacks.yajl_boolean = json_bool;
 419 #if YAJL_MAJOR >= 2
 420     g = yajl_gen_alloc(NULL);
 421     hand = yajl_alloc(&callbacks, NULL, (void*)g);
 422 #else
 423     g = yajl_gen_alloc(NULL, NULL);
 424     hand = yajl_alloc(&callbacks, NULL, NULL, (void*)g);
 425 #endif
 426     /* Allowing comments allows for more user-friendly layout files. */
 427     yajl_config(hand, yajl_allow_comments, true);
 428     /* Allow multiple values, i.e. multiple nodes to attach */
 429     yajl_config(hand, yajl_allow_multiple_values, true);
 430     yajl_status stat;
 431     json_node = focused;
 432     to_focus = NULL;
 433     parsing_swallows = false;
 434     parsing_rect = false;
 435     parsing_window_rect = false;
 436     parsing_geometry = false;
 437     parsing_focus = false;
 438     setlocale(LC_NUMERIC, "C");
 439     stat = yajl_parse(hand, (const unsigned char*)buf, n);
 440     if (stat != yajl_status_ok)
 441     {
 442         unsigned char *str = yajl_get_error(hand, 1, (const unsigned char*)buf, n);
 443         ELOG("JSON parsing error: %s\n", str);
 444         if (errormsg != NULL)
 445             *errormsg = sstrdup((const char*)str);
 446         yajl_free_error(hand, str);
 447     }
 448
 449     /* In case not all containers were restored, we need to fix the
 450      * percentages, otherwise i3 will crash immediately when rendering the
 451      * next time. */
 452     con_fix_percent(focused);
 453
 454     setlocale(LC_NUMERIC, "");
 455 #if YAJL_MAJOR >= 2
 456     yajl_complete_parse(hand);
 457 #else
 458     yajl_parse_complete(hand);
 459 #endif
 460
 461     fclose(f);
 462     if (to_focus)
 463         con_focus(to_focus);
 464 }