src/support/Package.cpp

   1 // -*- C++ -*-
   2 /**
   3  * \file package.C
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author Angus Leeming
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "support/Package.h"
  15
  16 #include "debug.h"
  17 #include "gettext.h"
  18
  19 #include "support/environment.h"
  20 #include "support/filetools.h"
  21 #include "support/lstrings.h"
  22 #include "support/ExceptionMessage.h"
  23 #include "support/os.h"
  24
  25 #if defined (USE_WINDOWS_PACKAGING)
  26 # include "support/os_win32.h"
  27 #endif
  28
  29
  30 #include <list>
  31
  32 #if !defined (USE_WINDOWS_PACKAGING) && \
  33     !defined (USE_MACOSX_PACKAGING) && \
  34     !defined (USE_POSIX_PACKAGING)
  35 #error USE_FOO_PACKAGING must be defined for FOO = WINDOWS, MACOSX or POSIX.
  36 #endif
  37
  38 #if defined (USE_MACOSX_PACKAGING)
  39 # include <CoreServices/CoreServices.h> // FSFindFolder, FSRefMakePath
  40 #endif
  41
  42 using std::string;
  43
  44 namespace lyx {
  45 namespace support {
  46
  47 namespace {
  48
  49 Package package_;
  50 bool initialised_ = false;
  51
  52 } // namespace anon
  53
  54
  55 void init_package(string const & command_line_arg0,
  56                   string const & command_line_system_support_dir,
  57                   string const & command_line_user_support_dir,
  58                   exe_build_dir_to_top_build_dir top_build_dir_location)
  59 {
  60         // Can do so only once.
  61         if (initialised_)
  62                 return;
  63
  64         package_ = Package(command_line_arg0,
  65                            command_line_system_support_dir,
  66                            command_line_user_support_dir,
  67                            top_build_dir_location);
  68         initialised_ = true;
  69 }
  70
  71
  72 Package const & package()
  73 {
  74         // Commented out because package().locale_dir() can be called
  75         // from the message translation code in Messages.cpp before
  76         // init_package() is called. Lars is on the case...
  77         // BOOST_ASSERT(initialised_);
  78         return package_;
  79 }
  80
  81
  82 namespace {
  83
  84 FileName const abs_path_from_binary_name(string const & exe);
  85
  86 void buildDirs(FileName const & abs_binary,
  87         exe_build_dir_to_top_build_dir top_build_dir_location,
  88         FileName &, FileName &);
  89
  90 FileName const get_document_dir(FileName const & home_dir);
  91
  92 FileName const get_home_dir();
  93
  94 FileName const get_locale_dir(FileName const & system_support_dir);
  95
  96 FileName const get_system_support_dir(FileName const & abs_binary,
  97                                     string const & command_line_system_support_dir);
  98
  99 FileName const get_temp_dir();
 100
 101 FileName const get_default_user_support_dir(FileName const & home_dir);
 102
 103 bool userSupportDir(FileName const & default_user_support_dir,
 104                      string const & command_line_user_support_dir, FileName & result);
 105
 106
 107 string const & with_version_suffix();
 108
 109 } // namespace anon
 110
 111
 112 Package::Package(string const & command_line_arg0,
 113                  string const & command_line_system_support_dir,
 114                  string const & command_line_user_support_dir,
 115                  exe_build_dir_to_top_build_dir top_build_dir_location)
 116         : explicit_user_support_dir_(false)
 117 {
 118         home_dir_ = get_home_dir();
 119         system_temp_dir_ = get_temp_dir();
 120         temp_dir_ = system_temp_dir_;
 121         document_dir_ = get_document_dir(home_dir_);
 122
 123         FileName const abs_binary = abs_path_from_binary_name(command_line_arg0);
 124         string const bdir = onlyPath(abs_binary.absFilename());
 125         // We may be using libtools
 126         if (suffixIs(bdir, ".libs/"))
 127                 binary_dir_ = FileName(addPath(bdir, "../"));
 128         else
 129                 binary_dir_ = FileName(bdir);
 130
 131         // Is LyX being run in-place from the build tree?
 132         buildDirs(abs_binary, top_build_dir_location,
 133                 build_support_dir_, system_support_dir_);
 134
 135         if (build_support_dir_.empty())
 136                 system_support_dir_ =
 137                         get_system_support_dir(abs_binary,
 138                                                command_line_system_support_dir);
 139
 140         locale_dir_ = get_locale_dir(system_support_dir_);
 141
 142         FileName const default_user_support_dir =
 143                 get_default_user_support_dir(home_dir_);
 144
 145         explicit_user_support_dir_ = userSupportDir(default_user_support_dir,
 146                                      command_line_user_support_dir, user_support_dir_);
 147
 148         FileName const configure_script(addName(system_support().absFilename(), "configure.py"));
 149         configure_command_ = os::python() + ' ' +
 150                         quoteName(configure_script.toFilesystemEncoding()) +
 151                         with_version_suffix();
 152
 153         lyxerr[Debug::INIT]
 154                 << "<package>\n"
 155                 << "\tbinary_dir " << binary_dir().absFilename() << '\n'
 156                 << "\tsystem_support " << system_support().absFilename() << '\n'
 157                 << "\tbuild_support " << build_support().absFilename() << '\n'
 158                 << "\tuser_support " << user_support().absFilename() << '\n'
 159                 << "\tlocale_dir " << locale_dir().absFilename() << '\n'
 160                 << "\tdocument_dir " << document_dir().absFilename() << '\n'
 161                 << "\ttemp_dir " << temp_dir().absFilename() << '\n'
 162                 << "\thome_dir " << home_dir().absFilename() << '\n'
 163                 << "</package>\n" << std::endl;
 164 }
 165
 166
 167 namespace {
 168
 169 // These next functions contain the stuff that is substituted at
 170 // configuration-time.
 171 FileName const hardcoded_localedir()
 172 {
 173         // FIXME UNICODE
 174         // The build system needs to make sure that this is in utf8 encoding.
 175         return FileName(LYX_ABS_INSTALLED_LOCALEDIR);
 176 }
 177
 178
 179 FileName const hardcoded_system_support_dir()
 180 {
 181         // FIXME UNICODE
 182         // The build system needs to make sure that this is in utf8 encoding.
 183         return FileName(LYX_ABS_INSTALLED_DATADIR);
 184 }
 185
 186
 187 string const & with_version_suffix()
 188 {
 189         static string const program_suffix = PROGRAM_SUFFIX;
 190         static string const with_version_suffix =
 191                 " --with-version-suffix=" PROGRAM_SUFFIX;
 192         return program_suffix.empty() ? program_suffix : with_version_suffix;
 193 }
 194
 195 } // namespace anon
 196
 197
 198 FileName const & Package::top_srcdir()
 199 {
 200         // FIXME UNICODE
 201         // The build system needs to make sure that this is in utf8 encoding.
 202         static FileName const dir(LYX_ABS_TOP_SRCDIR);
 203         return dir;
 204 }
 205
 206
 207 namespace {
 208
 209 bool check_command_line_dir(string const & dir,
 210                             string const & file,
 211                             string const & command_line_switch);
 212
 213 FileName const extract_env_var_dir(string const & env_var);
 214
 215 bool check_env_var_dir(FileName const & dir,
 216                        string const & env_var);
 217
 218 bool check_env_var_dir(FileName const & dir,
 219                        string const & file,
 220                        string const & env_var);
 221
 222 string const relative_locale_dir();
 223
 224 string const relative_system_support_dir();
 225
 226
 227 /**
 228  * Convert \p name to internal path and strip a trailing slash, since it
 229  * comes from user input (commandline or environment).
 230  * \p name is encoded in utf8.
 231  */
 232 string const fix_dir_name(string const & name)
 233 {
 234         return rtrim(os::internal_path(name), "/");
 235 }
 236
 237
 238 FileName buildSupportDir(string const & binary_dir,
 239                       exe_build_dir_to_top_build_dir top_build_dir_location)
 240 {
 241         string indirection;
 242         switch (top_build_dir_location) {
 243         case top_build_dir_is_one_level_up:
 244                 indirection = "../lib";
 245                 break;
 246         case top_build_dir_is_two_levels_up:
 247                 indirection = "../../lib";
 248                 break;
 249         }
 250         return FileName(addPath(binary_dir, indirection));
 251 }
 252
 253
 254 void buildDirs(FileName const & abs_binary,
 255   exe_build_dir_to_top_build_dir top_build_dir_location,
 256         FileName & build_support_dir, FileName & system_support_dir)
 257 {
 258         string const check_text = "Checking whether LyX is run in place...";
 259
 260         // We're looking for "Makefile" in a directory
 261         //   binary_dir/../lib
 262         // We're also looking for "chkconfig.ltx" in a directory
 263         //   top_srcdir()/lib
 264         // If both are found, then we're running LyX in-place.
 265
 266         // Note that the name of the lyx binary may be a symbolic link.
 267         // If that is the case, then we follow the links too.
 268         FileName binary = abs_binary;
 269         while (true) {
 270                 // Try and find "lyxrc.defaults".
 271                 string binary_dir = onlyPath(binary.absFilename());
 272                 // We may be using libtools with static linking.
 273                 if (suffixIs(binary_dir, ".libs/"))
 274                         binary_dir = addPath(binary_dir, "../");
 275                 build_support_dir = buildSupportDir(binary_dir, top_build_dir_location);
 276                 if (!fileSearch(build_support_dir.absFilename(), "Makefile").empty()) {
 277                         // Try and find "chkconfig.ltx".
 278                         system_support_dir =
 279                                 FileName(addPath(Package::top_srcdir().absFilename(), "lib"));
 280
 281                         if (!fileSearch(system_support_dir.absFilename(), "chkconfig.ltx").empty()) {
 282                                 lyxerr[Debug::INIT] << check_text << " yes"
 283                                                     << std::endl;
 284                                 return;
 285                         }
 286                 }
 287
 288                 // Check whether binary is a symbolic link.
 289                 // If so, resolve it and repeat the exercise.
 290                 if (!binary.isSymLink())
 291                         break;
 292
 293                 FileName link;
 294                 if (readLink(binary, link)) {
 295                         binary = link;
 296                 } else {
 297                         // Unable to resolve the link.
 298                         break;
 299                 }
 300         }
 301
 302         lyxerr[Debug::INIT] << check_text << " no" << std::endl;
 303         system_support_dir = FileName();
 304         build_support_dir = FileName();
 305 }
 306
 307
 308 // Specification of document_dir_ may be reset by LyXRC,
 309 // but the default is fixed for a given OS.
 310 FileName const get_document_dir(FileName const & home_dir)
 311 {
 312 #if defined (USE_WINDOWS_PACKAGING)
 313         (void)home_dir; // Silence warning about unused variable.
 314         os::GetFolderPath win32_folder_path;
 315         return FileName(win32_folder_path(os::GetFolderPath::PERSONAL));
 316 #else // Posix-like.
 317         return home_dir;
 318 #endif
 319 }
 320
 321
 322 // The specification of home_dir_ is fixed for a given OS.
 323 // A typical example on Windows: "C:/Documents and Settings/USERNAME"
 324 // and on a Posix-like machine: "/home/USERNAME".
 325 FileName const get_home_dir()
 326 {
 327 #if defined (USE_WINDOWS_PACKAGING)
 328         string const home_dir = getEnv("USERPROFILE");
 329 #else // Posix-like.
 330         string const home_dir = getEnv("HOME");
 331 #endif
 332
 333         return FileName(fix_dir_name(home_dir));
 334 }
 335
 336
 337 // Several sources are probed to ascertain the locale directory.
 338 // The only requirement is that the result is indeed a directory.
 339 FileName const get_locale_dir(FileName const & system_support_dir)
 340 {
 341         // 1. Use the "LYX_LOCALEDIR" environment variable.
 342         FileName const path_env = extract_env_var_dir("LYX_LOCALEDIR");
 343         if (!path_env.empty() && check_env_var_dir(path_env, "LYX_LOCALEDIR"))
 344                 return path_env;
 345
 346         // 2. Search for system_support_dir / <relative locale dir>
 347         // The <relative locale dir> is OS-dependent. (On Unix, it will
 348         // be "../locale/".)
 349         FileName path(addPath(system_support_dir.absFilename(),
 350                 relative_locale_dir()));
 351
 352         if (path.exists() && path.isDirectory())
 353                 return path;
 354
 355         // 3. Fall back to the hard-coded LOCALEDIR.
 356         path = hardcoded_localedir();
 357         if (path.exists() && path.isDirectory())
 358                 return path;
 359
 360         return FileName();
 361 }
 362
 363
 364 // Specification of temp_dir_ may be reset by LyXRC,
 365 // but the default is fixed for a given OS.
 366 FileName const get_temp_dir()
 367 {
 368 #if defined (USE_WINDOWS_PACKAGING)
 369         // Typical example: C:/TEMP/.
 370         char path[MAX_PATH];
 371         GetTempPath(MAX_PATH, path);
 372         return FileName(os::internal_path(to_utf8(from_local8bit(path))));
 373 #else // Posix-like.
 374         return FileName("/tmp");
 375 #endif
 376 }
 377
 378
 379 // Extracts the absolute path from the foo of "-sysdir foo" or "-userdir foo"
 380 FileName const abs_path_from_command_line(string const & command_line)
 381 {
 382         if (command_line.empty())
 383                 return FileName();
 384
 385         string const path = fix_dir_name(command_line);
 386         return os::is_absolute_path(path) ? FileName(path) : makeAbsPath(path);
 387 }
 388
 389
 390 // Does the grunt work for abs_path_from_binary_name()
 391 FileName const get_binary_path(string const & exe)
 392 {
 393 #if defined (USE_WINDOWS_PACKAGING)
 394         // The executable may have been invoked either with or
 395         // without the .exe extension.
 396         // Ensure that it is present.
 397         string const as_internal_path = os::internal_path(exe);
 398         string const exe_path = suffixIs(as_internal_path, ".exe") ?
 399                 as_internal_path : as_internal_path + ".exe";
 400 #else
 401         string const exe_path = os::internal_path(exe);
 402 #endif
 403         if (os::is_absolute_path(exe_path))
 404                 return FileName(exe_path);
 405
 406         // Two possibilities present themselves.
 407         // 1. The binary is relative to the CWD.
 408         FileName const abs_exe_path = makeAbsPath(exe_path);
 409         if (abs_exe_path.exists())
 410                 return abs_exe_path;
 411
 412         // 2. exe must be the name of the binary only and it
 413         // can be found on the PATH.
 414         string const exe_name = onlyFilename(exe_path);
 415         if (exe_name != exe_path)
 416                 return FileName();
 417
 418         std::vector<string> const path = getEnvPath("PATH");
 419         std::vector<string>::const_iterator it = path.begin();
 420         std::vector<string>::const_iterator const end = path.end();
 421         for (; it != end; ++it) {
 422                 // This will do nothing if *it is already absolute.
 423                 string const exe_dir = makeAbsPath(*it).absFilename();
 424
 425                 FileName const exe_path(addName(exe_dir, exe_name));
 426                 if (exe_path.exists())
 427                         return exe_path;
 428         }
 429
 430         // Didn't find anything.
 431         return FileName();
 432 }
 433
 434
 435 // Extracts the absolute path to the binary name received as argv[0].
 436 FileName const abs_path_from_binary_name(string const & exe)
 437 {
 438         FileName const abs_binary = get_binary_path(exe);
 439         if (abs_binary.empty()) {
 440                 // FIXME UNICODE
 441                 throw ExceptionMessage(ErrorException,
 442                         _("LyX binary not found"),
 443                         bformat(_("Unable to determine the path to the LyX binary from the command line %1$s"),
 444                                 from_utf8(exe)));
 445         }
 446         return abs_binary;
 447 }
 448
 449
 450 // A plethora of directories is searched to ascertain the system
 451 // lyxdir which is defined as the first directory to contain
 452 // "chkconfig.ltx".
 453 FileName const
 454 get_system_support_dir(FileName const & abs_binary,
 455                   string const & command_line_system_support_dir)
 456 {
 457         string const chkconfig_ltx = "chkconfig.ltx";
 458
 459         // searched_dirs is used for diagnostic purposes only in the case
 460         // that "chkconfig.ltx" is not found.
 461         std::list<FileName> searched_dirs;
 462
 463         // 1. Use the -sysdir command line parameter.
 464         FileName path = abs_path_from_command_line(command_line_system_support_dir);
 465         if (!path.empty()) {
 466                 searched_dirs.push_back(path);
 467                 if (check_command_line_dir(path.absFilename(), chkconfig_ltx, "-sysdir"))
 468                         return path;
 469         }
 470
 471         // 2. Use the "LYX_DIR_15x" environment variable.
 472         path = extract_env_var_dir("LYX_DIR_15x");
 473         if (!path.empty()) {
 474                 searched_dirs.push_back(path);
 475                 if (check_env_var_dir(path, chkconfig_ltx, "LYX_DIR_15x"))
 476                         return path;
 477         }
 478
 479         // 3. Search relative to the lyx binary.
 480         // We're looking for "chkconfig.ltx" in a directory
 481         //   OnlyPath(abs_binary) / <relative dir> / PACKAGE /
 482         // PACKAGE is hardcoded in config.h. Eg "lyx" or "lyx-1.3.6cvs".
 483         // <relative dir> is OS-dependent; on Unix, it will be "../share/".
 484         string const relative_lyxdir = relative_system_support_dir();
 485
 486         // One subtlety to be aware of. The name of the lyx binary may be
 487         // a symbolic link. If that is the case, then we follow the links too.
 488         FileName binary = abs_binary;
 489         while (true) {
 490                 // Try and find "chkconfig.ltx".
 491                 string const binary_dir = onlyPath(binary.absFilename());
 492
 493                 FileName const lyxdir(addPath(binary_dir, relative_lyxdir));
 494                 searched_dirs.push_back(lyxdir);
 495
 496                 if (!fileSearch(lyxdir.absFilename(), chkconfig_ltx).empty()) {
 497                         // Success! "chkconfig.ltx" has been found.
 498                         return lyxdir;
 499                 }
 500
 501                 // Check whether binary is a symbolic link.
 502                 // If so, resolve it and repeat the exercise.
 503                 if (!binary.isSymLink())
 504                         break;
 505
 506                 FileName link;
 507                 if (readLink(binary, link)) {
 508                         binary = link;
 509                 } else {
 510                         // Unable to resolve the link.
 511                         break;
 512                 }
 513         }
 514
 515         // 4. Repeat the exercise on the directory itself.
 516         FileName binary_dir(onlyPath(abs_binary.absFilename()));
 517         while (true) {
 518                 // This time test whether the directory is a symbolic link
 519                 // *before* looking for "chkconfig.ltx".
 520                 // (We've looked relative to the original already.)
 521                 if (!binary.isSymLink())
 522                         break;
 523
 524                 FileName link;
 525                 if (readLink(binary_dir, link)) {
 526                         binary_dir = link;
 527                 } else {
 528                         // Unable to resolve the link.
 529                         break;
 530                 }
 531
 532                 // Try and find "chkconfig.ltx".
 533                 FileName const lyxdir(addPath(binary_dir.absFilename(),
 534                         relative_lyxdir));
 535                 searched_dirs.push_back(lyxdir);
 536
 537                 if (!fileSearch(lyxdir.absFilename(), chkconfig_ltx).empty()) {
 538                         // Success! "chkconfig.ltx" has been found.
 539                         return lyxdir;
 540                 }
 541         }
 542
 543         // 5. In desparation, try the hard-coded system support dir.
 544         path = hardcoded_system_support_dir();
 545         if (!fileSearch(path.absFilename(), chkconfig_ltx).empty())
 546                 return path;
 547
 548         // Everything has failed :-(
 549         // So inform the user and exit.
 550         string searched_dirs_str;
 551         typedef std::list<FileName>::const_iterator iterator;
 552         iterator const begin = searched_dirs.begin();
 553         iterator const end = searched_dirs.end();
 554         for (iterator it = begin; it != end; ++it) {
 555                 if (it != begin)
 556                         searched_dirs_str += "\n\t";
 557                 searched_dirs_str += it->absFilename();
 558         }
 559
 560         // FIXME UNICODE
 561         throw ExceptionMessage(ErrorException, _("No system directory"),
 562                 bformat(_("Unable to determine the system directory "
 563                                          "having searched\n"
 564                                          "\t%1$s\n"
 565                                          "Use the '-sysdir' command line parameter or "
 566                                          "set the environment variable LYX_DIR_15x to "
 567                                          "the LyX system directory containing the file "
 568                                          "`chkconfig.ltx'."),
 569                           from_utf8(searched_dirs_str)));
 570
 571         // Keep the compiler happy.
 572         return FileName();
 573 }
 574
 575
 576 // Returns the absolute path to the user lyxdir, together with a flag
 577 // indicating whether this directory was specified explicitly (as -userdir
 578 // or through an environment variable) or whether it was deduced.
 579 bool userSupportDir(FileName const & default_user_support_dir,
 580         string const & command_line_user_support_dir, FileName & result)
 581 {
 582         // 1. Use the -userdir command line parameter.
 583         result = abs_path_from_command_line(command_line_user_support_dir);
 584         if (!result.empty())
 585                 return true;
 586
 587         // 2. Use the LYX_USERDIR_15x environment variable.
 588         result = extract_env_var_dir("LYX_USERDIR_15x");
 589         if (!result.empty())
 590                 return true;
 591
 592         // 3. Use the OS-dependent default_user_support_dir
 593         result = default_user_support_dir;
 594         return false;
 595 }
 596
 597
 598 // $HOME/.lyx on POSIX but on Win32 it will be something like
 599 // "C:/Documents and Settings/USERNAME/Application Data/LyX"
 600 FileName const get_default_user_support_dir(FileName const & home_dir)
 601 {
 602 #if defined (USE_WINDOWS_PACKAGING)
 603         (void)home_dir; // Silence warning about unused variable.
 604
 605         os::GetFolderPath win32_folder_path;
 606         return FileName(addPath(win32_folder_path(os::GetFolderPath::APPDATA), PACKAGE));
 607
 608 #elif defined (USE_MACOSX_PACKAGING)
 609         (void)home_dir; // Silence warning about unused variable.
 610
 611         FSRef fsref;
 612         OSErr const error_code =
 613                 FSFindFolder(kUserDomain, kApplicationSupportFolderType,
 614                              kDontCreateFolder, &fsref);
 615         if (error_code != 0)
 616                 return FileName();
 617
 618         // FSRefMakePath returns the result in utf8
 619         char store[PATH_MAX + 1];
 620         OSStatus const status_code =
 621                 FSRefMakePath(&fsref,
 622                               reinterpret_cast<UInt8*>(store), PATH_MAX);
 623         if (status_code != 0)
 624                 return FileName();
 625
 626         return FileName(addPath(reinterpret_cast<char const *>(store), PACKAGE));
 627
 628 #else // USE_POSIX_PACKAGING
 629         return FileName(addPath(home_dir.absFilename(), string(".") + PACKAGE));
 630 #endif
 631 }
 632
 633
 634 // Check that directory @c dir contains @c file.
 635 // Else emit a warning about an invalid @c command_line_switch.
 636 bool check_command_line_dir(string const & dir,
 637                             string const & file,
 638                             string const & command_line_switch)
 639 {
 640         FileName const abs_path = fileSearch(dir, file);
 641         if (abs_path.empty()) {
 642                 // FIXME UNICODE
 643                 throw ExceptionMessage(WarningException, _("File not found"), bformat(
 644                         _("Invalid %1$s switch.\nDirectory %2$s does not contain %3$s."),
 645                         from_utf8(command_line_switch), from_utf8(dir),
 646                         from_utf8(file)));
 647         }
 648
 649         return !abs_path.empty();
 650 }
 651
 652
 653 // The environment variable @c env_var expands to a (single) file path.
 654 FileName const extract_env_var_dir(string const & env_var)
 655 {
 656         string const dir = fix_dir_name(getEnv(env_var));
 657         return dir.empty() ? FileName() : makeAbsPath(dir);
 658 }
 659
 660
 661 // Check that directory @c dir contains @c file.
 662 // Else emit a warning about an invalid @c env_var.
 663 bool check_env_var_dir(FileName const & dir,
 664                        string const & file,
 665                        string const & env_var)
 666 {
 667         FileName const abs_path = fileSearch(dir.absFilename(), file);
 668         if (abs_path.empty()) {
 669                 // FIXME UNICODE
 670                 throw ExceptionMessage(WarningException, _("File not found"), bformat(
 671                         _("Invalid %1$s environment variable.\n"
 672                                 "Directory %2$s does not contain %3$s."),
 673                         from_utf8(env_var), from_utf8(dir.absFilename()),
 674                         from_utf8(file)));
 675         }
 676
 677         return !abs_path.empty();
 678 }
 679
 680
 681 // Check that directory @c dir is indeed a directory.
 682 // Else emit a warning about an invalid @c env_var.
 683 bool check_env_var_dir(FileName const & dir,
 684                        string const & env_var)
 685 {
 686         bool const success = dir.exists() && dir.isDirectory();
 687
 688         if (!success) {
 689                 // Put this string on a single line so that the gettext
 690                 // search mechanism in po/Makefile.in.in will register
 691                 // Package.cpp.in as a file containing strings that need
 692                 // translation.
 693                 // FIXME UNICODE
 694                 docstring const fmt =
 695                         _("Invalid %1$s environment variable.\n%2$s is not a directory.");
 696
 697                 throw ExceptionMessage(WarningException, _("Directory not found"), bformat(
 698                         fmt, from_utf8(env_var), from_utf8(dir.absFilename())));
 699         }
 700
 701         return success;
 702 }
 703
 704
 705 // The locale directory relative to the LyX system directory.
 706 string const relative_locale_dir()
 707 {
 708 #if defined (USE_WINDOWS_PACKAGING) || defined (USE_MACOSX_PACKAGING)
 709         return "locale/";
 710 #else
 711         return "../locale/";
 712 #endif
 713 }
 714
 715
 716 // The system lyxdir is relative to the directory containing the LyX binary.
 717 string const relative_system_support_dir()
 718 {
 719         string result;
 720
 721 #if defined (USE_WINDOWS_PACKAGING) || defined (USE_MACOSX_PACKAGING)
 722         result = "../Resources/";
 723 #else // Posix-like.
 724         result = addPath("../share/", PACKAGE);
 725 #endif
 726
 727         return result;
 728 }
 729
 730 } // namespace anon
 731
 732 } // namespace support
 733 } // namespace lyx