util/wmmenugen_parse_xdg.c

   1 /*
   2  * wmmenugen - Window Maker PropList menu generator
   3  *
   4  * Desktop Entry Specification parser functions
   5  *
   6  * Copyright (c) 2010. Tamas Tevesz <ice@extreme.hu>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 /*
  24  * http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-1.1.html
  25  * http://standards.freedesktop.org/menu-spec/menu-spec-1.1.html
  26  *
  27  * We will only deal with Type == "Application" entries in [Desktop Entry]
  28  * groups. Since there is no passing of file name arguments or anything of
  29  * the sort to applications from the menu, execname is determined as follows:
  30  * - If `TryExec' is present, use that;
  31  * - else use `Exec' with any switches stripped
  32  *
  33  * Only the (first, though there should not be more than one) `Main Category'
  34  * is used to place the entry in a submenu.
  35  *
  36  * Basic validation of the .desktop file is done.
  37  */
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41
  42 #include <ctype.h>
  43 #include <ftw.h>
  44 #if DEBUG
  45 #include <errno.h>
  46 #endif
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50
  51 #include "wmmenugen.h"
  52
  53 /* LocaleString match levels */
  54 enum {
  55         MATCH_DEFAULT,
  56         MATCH_LANG,
  57         MATCH_LANG_MODIFIER,
  58         MATCH_LANG_COUNTRY,
  59         MATCH_LANG_COUNTRY_MODIFIER
  60 };
  61
  62 typedef struct {
  63         char    *Name;          /* Name */                              /* localestring */
  64         int      MatchLevel;    /* LocaleString match type */           /* int */
  65         char    *TryExec;       /* TryExec */                           /* string */
  66         char    *Exec;          /* Exec */                              /* string */
  67         char    *Path;          /* Path */                              /* string */
  68         int      Flags;         /* Flags */
  69         char    *Category;      /* Categories (first item only) */      /* string */
  70 } XDGMenuEntry;
  71
  72 static void  getKey(char **target, const char *line);
  73 static void  getStringValue(char **target, const char *line);
  74 static void  getLocalizedStringValue(char **target, const char *line, int *match_level);
  75 static int   getBooleanValue(const char *line);
  76 static void  getMenuHierarchyFor(char **xdgmenuspec);
  77 static int   compare_matchlevel(int *current_level, const char *found_locale);
  78 static Bool  xdg_to_wm(XDGMenuEntry **xdg, WMMenuEntry **wmentry);
  79 static void init_xdg_storage(XDGMenuEntry **xdg);
  80 static void init_wm_storage(WMMenuEntry **wm);
  81
  82
  83 void parse_xdg(const char *file, cb_add_menu_entry *addWMMenuEntryCallback)
  84 {
  85         FILE *fp;
  86         char buf[1024];
  87         char *p, *tmp, *key;
  88         WMMenuEntry *wm;
  89         XDGMenuEntry *xdg;
  90         int InGroup;
  91
  92         fp = fopen(file, "r");
  93         if (!fp) {
  94 #if DEBUG
  95                 fprintf(stderr, "Error opening file %s: %s\n", file, strerror(errno));
  96 #endif
  97                 return;
  98         }
  99
 100         xdg = (XDGMenuEntry *)wmalloc(sizeof(XDGMenuEntry));
 101         wm = (WMMenuEntry *)wmalloc(sizeof(WMMenuEntry));
 102         InGroup = 0;
 103         memset(buf, 0, sizeof(buf));
 104
 105         while (fgets(buf, sizeof(buf), fp)) {
 106
 107                 p = buf;
 108
 109                 /* skip whitespaces */
 110                 while (isspace(*p))
 111                         p++;
 112                 /* skip comments, empty lines */
 113                 if (*p == '\r' || *p == '\n' || *p == '#') {
 114                         memset(buf, 0, sizeof(buf));
 115                         continue;
 116                 }
 117                 /* trim crlf */
 118                 buf[strcspn(buf, "\r\n")] = '\0';
 119                 if (strlen(buf) == 0)
 120                         continue;
 121
 122                 if (strcmp(p, "[Desktop Entry]") == 0) {
 123                         /* if currently processing a group, we've just hit the
 124                          * end of its definition, try processing it
 125                          */
 126                         if (InGroup && xdg_to_wm(&xdg, &wm)) {
 127                                 (*addWMMenuEntryCallback)(wm);
 128                         }
 129                         init_xdg_storage(&xdg);
 130                         init_wm_storage(&wm);
 131                         InGroup = 1;
 132                         /* start processing group */
 133                         memset(buf, 0, sizeof(buf));
 134                         continue;
 135                 }
 136
 137                 if (!InGroup) {
 138                         memset(buf, 0, sizeof(buf));
 139                         continue;
 140                 }
 141
 142                 getKey(&key, p);
 143                 if (key == NULL) { /* not `key' = `value' */
 144                         memset(buf, 0, sizeof(buf));
 145                         continue;
 146                 }
 147
 148                 if (strcmp(key, "Type") == 0) {
 149                         getStringValue(&tmp, p);
 150                         if (strcmp(tmp, "Application") != 0)
 151                                 InGroup = 0;    /* if not application, skip current group */
 152                         wfree(tmp);
 153                         tmp = NULL;
 154                 } else if (strcmp(key, "Name") == 0) {
 155                         getLocalizedStringValue(&xdg->Name, p, &xdg->MatchLevel);
 156                 } else if (strcmp(key, "NoDisplay") == 0) {
 157                         if (getBooleanValue(p)) /* if nodisplay, skip current group */
 158                                 InGroup = 0;
 159                 } else if (strcmp(key, "Hidden") == 0) {
 160                         if (getBooleanValue(p))
 161                                 InGroup = 0;    /* if hidden, skip current group */
 162                 } else if (strcmp(key, "TryExec") == 0) {
 163                         getStringValue(&xdg->TryExec, p);
 164                 } else if (strcmp(key, "Exec") == 0) {
 165                         getStringValue(&xdg->Exec, p);
 166                 } else if (strcmp(key, "Path") == 0) {
 167                         getStringValue(&xdg->Path, p);
 168                 } else if (strcmp(key, "Terminal") == 0) {
 169                         if (getBooleanValue(p))
 170                                 xdg->Flags |= F_TERMINAL;
 171                 } else if (strcmp(key, "Categories") == 0) {
 172                         getStringValue(&xdg->Category, p);
 173                         getMenuHierarchyFor(&xdg->Category);
 174                 }
 175
 176                 wfree(key);
 177                 key = NULL;
 178         }
 179
 180         fclose(fp);
 181
 182         /* at the end of the file, might as well try to menuize what we have
 183          * unless there was no group at all or it was marked as hidden
 184          */
 185         if (InGroup && xdg_to_wm(&xdg, &wm))
 186                 (*addWMMenuEntryCallback)(wm);
 187
 188 }
 189
 190
 191 /* coerce an xdg entry type into a wm entry type
 192  */
 193 static Bool xdg_to_wm(XDGMenuEntry **xdg, WMMenuEntry **wm)
 194 {
 195         char *p;
 196
 197         /* Exec or TryExec is mandatory */
 198         if (!((*xdg)->Exec || (*xdg)->TryExec))
 199                 return False;
 200
 201         /* if there's no Name, use the first word of Exec or TryExec
 202          */
 203         if ((*xdg)->Name) {
 204                 (*wm)->Name = (*xdg)->Name;
 205         } else  {
 206                 if ((*xdg)->Exec)
 207                         (*wm)->Name = wstrdup((*xdg)->Exec);
 208                 else /* (*xdg)->TryExec */
 209                         (*wm)->Name = wstrdup((*xdg)->TryExec);
 210
 211                 p = strchr((*wm)->Name, ' ');
 212                 if (p)
 213                         *p = '\0';
 214         }
 215
 216         if ((*xdg)->Exec)
 217                 (*wm)->CmdLine = (*xdg)->Exec;
 218         else                                    /* (*xdg)->TryExec */
 219                 (*wm)->CmdLine = (*xdg)->TryExec;
 220
 221         (*wm)->SubMenu = (*xdg)->Category;
 222         (*wm)->Flags = (*xdg)->Flags;
 223
 224         return True;
 225 }
 226
 227 /* (re-)initialize a XDGMenuEntry storage
 228  */
 229 static void init_xdg_storage(XDGMenuEntry **xdg)
 230 {
 231
 232         if ((*xdg)->Name)
 233                 wfree((*xdg)->Name);
 234         if ((*xdg)->TryExec)
 235                 wfree((*xdg)->TryExec);
 236         if ((*xdg)->Exec)
 237                 wfree((*xdg)->Exec);
 238         if ((*xdg)->Category)
 239                 wfree((*xdg)->Category);
 240         if ((*xdg)->Path)
 241                 wfree((*xdg)->Path);
 242
 243         (*xdg)->Name = NULL;
 244         (*xdg)->TryExec = NULL;
 245         (*xdg)->Exec = NULL;
 246         (*xdg)->Category = NULL;
 247         (*xdg)->Path = NULL;
 248         (*xdg)->Flags = 0;
 249         (*xdg)->MatchLevel = -1;
 250 }
 251
 252 /* (re-)initialize a WMMenuEntry storage
 253  */
 254 static void init_wm_storage(WMMenuEntry **wm)
 255 {
 256         (*wm)->Name = NULL;
 257         (*wm)->CmdLine = NULL;
 258         (*wm)->Flags = 0;
 259 }
 260
 261 /* get a key from line. allocates target, which must be wfreed later */
 262 static void getKey(char **target, const char *line)
 263 {
 264         const char *p;
 265         int kstart, kend;
 266
 267         p = line;
 268
 269         if (strchr(p, '=') == NULL) {           /* not `key' = `value' */
 270                 *target = NULL;
 271                 return;
 272         }
 273
 274         kstart = 0;
 275
 276         /* skip whitespace */
 277         while (isspace(*(p + kstart)))
 278                 kstart++;
 279
 280         /* skip up until first whitespace or '[' (localestring) or '=' */
 281         kend = kstart + 1;
 282         while (*(p + kend) && !isspace(*(p + kend)) && *(p + kend) != '=' && *(p + kend) != '[')
 283                 kend++;
 284
 285         *target = wstrndup(p + kstart, kend - kstart);
 286 }
 287
 288 /* get a string value from line. allocates target, which must be wfreed later. */
 289 static void getStringValue(char **target, const char *line)
 290 {
 291         const char *p;
 292         int kstart;
 293
 294         p = line;
 295         kstart = 0;
 296
 297         /* skip until after '=' */
 298         while (*(p + kstart) && *(p + kstart) != '=')
 299                 kstart++;
 300         kstart++;
 301
 302         /* skip whitespace */
 303         while (*(p + kstart) && isspace(*(p + kstart)))
 304                 kstart++;
 305
 306         *target = wstrdup(p + kstart);
 307 }
 308
 309 /* get a localized string value from line. allocates target, which must be wfreed later.
 310  * matching is dependent on the current value of target as well as on the
 311  * level the current value is matched on. guts matching algorithm is in
 312  * compare_matchlevel().
 313  */
 314 static void getLocalizedStringValue(char **target, const char *line, int *match_level)
 315 {
 316         const char *p;
 317         char *locale;
 318         int kstart;
 319         int sqbstart, sqbend;
 320
 321         p = line;
 322         kstart = 0;
 323         sqbstart = 0;
 324         sqbend = 0;
 325         locale = NULL;
 326
 327         /* skip until after '=', mark if '[' and ']' is found */
 328         while (*(p + kstart) && *(p + kstart) != '=') {
 329                 switch (*(p + kstart)) {
 330                         case '[': sqbstart = kstart + 1;break;
 331                         case ']': sqbend = kstart;      break;
 332                         default :                       break;
 333                 }
 334                 kstart++;
 335         }
 336         kstart++;
 337
 338         /* skip whitespace */
 339         while (isspace(*(p + kstart)))
 340                 kstart++;
 341
 342         if (sqbstart > 0 && sqbend > sqbstart)
 343                 locale = wstrndup(p + sqbstart, sqbend - sqbstart);
 344
 345         /* if there is no value yet and this is the default key, return */
 346         if (!*target && !locale) {
 347                 *match_level = MATCH_DEFAULT;
 348                 *target = wstrdup(p + kstart);
 349                 return;
 350         }
 351
 352         if (compare_matchlevel(match_level, locale)) {
 353                 wfree(locale);
 354                 *target = wstrdup(p + kstart);
 355                 return;
 356         }
 357
 358         return;
 359 }
 360
 361 /* get a boolean value from line */
 362 static Bool getBooleanValue(const char *line)
 363 {
 364         char *p;
 365         int ret;
 366
 367         getStringValue(&p, line);
 368         ret = strcmp(p, "true") == 0 ? True : False;
 369         wfree(p);
 370
 371         return ret;
 372 }
 373
 374 /* perform locale matching by implementing the algorithm specified in
 375  * xdg desktop entry specification, section "localized values for keys".
 376  */
 377 static Bool compare_matchlevel(int *current_level, const char *found_locale)
 378 {
 379         /* current key locale */
 380         char *key_lang, *key_ctry, *key_enc, *key_mod;
 381
 382         parse_locale(found_locale, &key_lang, &key_ctry, &key_enc, &key_mod);
 383
 384         if (env_lang && key_lang &&             /* Shortcut: if key and env languages don't match, */
 385             strcmp(env_lang, key_lang) != 0)    /* don't even bother. This takes care of the great */
 386                 return False;                   /* majority of the cases without having to go through */
 387                                                 /* the more theoretical parts of the spec'd algo. */
 388
 389         if (!env_mod && key_mod)        /* If LC_MESSAGES does not have a MODIFIER field, */
 390                 return False;           /* then no key with a modifier will be matched. */
 391
 392         if (!env_ctry && key_ctry)      /* Similarly, if LC_MESSAGES does not have a COUNTRY field, */
 393                 return False;           /* then no key with a country specified will be matched. */
 394
 395         /* LC_MESSAGES value: lang_COUNTRY@MODIFIER */
 396         if (env_lang && env_ctry && env_mod) {          /* lang_COUNTRY@MODIFIER */
 397                 if (key_lang && key_ctry && key_mod &&
 398                     strcmp(env_lang, key_lang) == 0 &&
 399                     strcmp(env_ctry, key_ctry) == 0 &&
 400                     strcmp(env_mod,  key_mod) == 0) {
 401                         *current_level = MATCH_LANG_COUNTRY_MODIFIER;
 402                         return True;
 403                 } else if (key_lang && key_ctry &&      /* lang_COUNTRY */
 404                     strcmp(env_lang, key_lang) == 0 &&
 405                     strcmp(env_ctry, key_ctry) == 0 &&
 406                     *current_level < MATCH_LANG_COUNTRY) {
 407                         *current_level = MATCH_LANG_COUNTRY;
 408                         return True;
 409                 } else if (key_lang && key_mod &&       /* lang@MODIFIER */
 410                     strcmp(env_lang, key_lang) == 0 &&
 411                     strcmp(env_mod,  key_mod) == 0 &&
 412                     *current_level < MATCH_LANG_MODIFIER) {
 413                         *current_level = MATCH_LANG_MODIFIER;
 414                         return True;
 415                 } else if (key_lang &&                  /* lang */
 416                     strcmp(env_lang, key_lang) == 0 &&
 417                     *current_level < MATCH_LANG) {
 418                         *current_level = MATCH_LANG;
 419                         return True;
 420                 } else {
 421                         return False;
 422                 }
 423         }
 424
 425         /* LC_MESSAGES value: lang_COUNTRY */
 426         if (env_lang && env_ctry) {                     /* lang_COUNTRY */
 427                 if (key_lang && key_ctry &&
 428                     strcmp(env_lang, key_lang) == 0 &&
 429                     strcmp(env_ctry, key_ctry) == 0 &&
 430                     *current_level < MATCH_LANG_COUNTRY) {
 431                         *current_level = MATCH_LANG_COUNTRY;
 432                         return True;
 433                 } else if (key_lang &&                  /* lang */
 434                     strcmp(env_lang, key_lang) == 0 &&
 435                     *current_level < MATCH_LANG) {
 436                         *current_level = MATCH_LANG;
 437                         return True;
 438                 } else {
 439                         return False;
 440                 }
 441         }
 442
 443         /* LC_MESSAGES value: lang@MODIFIER */
 444         if (env_lang && env_mod) {                      /* lang@MODIFIER */
 445                 if (key_lang && key_mod &&
 446                     strcmp(env_lang, key_lang) == 0 &&
 447                     strcmp(env_mod,  key_mod) == 0 &&
 448                     *current_level < MATCH_LANG_MODIFIER) {
 449                         *current_level = MATCH_LANG_MODIFIER;
 450                         return True;
 451                 } else if (key_lang &&                  /* lang */
 452                     strcmp(env_lang, key_lang) == 0 &&
 453                     *current_level < MATCH_LANG) {
 454                         *current_level = MATCH_LANG;
 455                         return True;
 456                 } else {
 457                         return False;
 458                 }
 459         }
 460
 461         /* LC_MESSAGES value: lang */
 462         if (env_lang) {                                 /* lang */
 463                 if (key_lang &&
 464                     strcmp(env_lang, key_lang) == 0 &&
 465                     *current_level < MATCH_LANG) {
 466                         *current_level = MATCH_LANG;
 467                         return True;
 468                 } else {
 469                         return False;
 470                 }
 471         }
 472
 473         /* MATCH_DEFAULT is handled in getLocalizedStringValue */
 474
 475         return False;
 476 }
 477
 478 /* get the (first) xdg main category from a list of categories
 479  */
 480 static void  getMenuHierarchyFor(char **xdgmenuspec)
 481 {
 482         char *category, *p;
 483         char buf[1024];
 484
 485         if (!*xdgmenuspec || !**xdgmenuspec)
 486                 return;
 487
 488         category = wstrdup(*xdgmenuspec);
 489         wfree(*xdgmenuspec);
 490         memset(buf, 0, sizeof(buf));
 491
 492         p = strtok(category, ";");
 493         while (p) {             /* get a known category */
 494                 if (strcmp(p, "AudioVideo") == 0) {
 495                         snprintf(buf, sizeof(buf), "%s", _("Audio & Video"));
 496                         break;
 497                 } else if (strcmp(p, "Audio") == 0) {
 498                         snprintf(buf, sizeof(buf), "%s", _("Audio"));
 499                         break;
 500                 } else if (strcmp(p, "Video") == 0) {
 501                         snprintf(buf, sizeof(buf), "%s", _("Video"));
 502                         break;
 503                 } else if (strcmp(p, "Development") == 0) {
 504                         snprintf(buf, sizeof(buf), "%s", _("Development"));
 505                         break;
 506                 } else if (strcmp(p, "Education") == 0) {
 507                         snprintf(buf, sizeof(buf), "%s", _("Education"));
 508                         break;
 509                 } else if (strcmp(p, "Game") == 0) {
 510                         snprintf(buf, sizeof(buf), "%s", _("Game"));
 511                         break;
 512                 } else if (strcmp(p, "Graphics") == 0) {
 513                         snprintf(buf, sizeof(buf), "%s", _("Graphics"));
 514                         break;
 515                 } else if (strcmp(p, "Network") == 0) {
 516                         snprintf(buf, sizeof(buf), "%s", _("Network"));
 517                         break;
 518                 } else if (strcmp(p, "Office") == 0) {
 519                         snprintf(buf, sizeof(buf), "%s", _("Office"));
 520                         break;
 521                 } else if (strcmp(p, "Settings") == 0) {
 522                         snprintf(buf, sizeof(buf), "%s", _("Settings"));
 523                         break;
 524                 } else if (strcmp(p, "System") == 0) {
 525                         snprintf(buf, sizeof(buf), "%s", _("System"));
 526                         break;
 527                 } else if (strcmp(p, "Utility") == 0) {
 528                         snprintf(buf, sizeof(buf), "%s", _("Utility"));
 529                         break;
 530                 }
 531                 p = strtok(NULL, ";");
 532         }
 533
 534
 535         if (!*buf)              /* come up with something if nothing found */
 536                 snprintf(buf, sizeof(buf), "%s", _("Applications"));
 537
 538         *xdgmenuspec = wstrdup(buf);
 539 }