src/insets/InsetBibtex.cpp

   1 /**
   2  * \file InsetBibtex.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Alejandro Aguilar Sierra
   7  * \author Richard Heck (BibTeX parser improvements)
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "InsetBibtex.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "DispatchResult.h"
  19 #include "Encoding.h"
  20 #include "FuncRequest.h"
  21 #include "LaTeXFeatures.h"
  22 #include "MetricsInfo.h"
  23 #include "OutputParams.h"
  24 #include "TextClass.h"
  25
  26 #include "frontends/alert.h"
  27
  28 #include "support/debug.h"
  29 #include "support/docstream.h"
  30 #include "support/ExceptionMessage.h"
  31 #include "support/filetools.h"
  32 #include "support/gettext.h"
  33 #include "support/lstrings.h"
  34 #include "support/os.h"
  35 #include "support/Path.h"
  36 #include "support/textutils.h"
  37
  38 #include <limits>
  39
  40 using namespace std;
  41 using namespace lyx::support;
  42
  43 namespace lyx {
  44
  45 namespace Alert = frontend::Alert;
  46 namespace os = support::os;
  47
  48
  49 InsetBibtex::InsetBibtex(InsetCommandParams const & p)
  50         : InsetCommand(p, "bibtex")
  51 {}
  52
  53
  54 ParamInfo const & InsetBibtex::findInfo(string const & /* cmdName */)
  55 {
  56         static ParamInfo param_info_;
  57         if (param_info_.empty()) {
  58                 param_info_.add("btprint", ParamInfo::LATEX_OPTIONAL);
  59                 param_info_.add("bibfiles", ParamInfo::LATEX_REQUIRED);
  60                 param_info_.add("options", ParamInfo::LYX_INTERNAL);
  61         }
  62         return param_info_;
  63 }
  64
  65
  66 void InsetBibtex::doDispatch(Cursor & cur, FuncRequest & cmd)
  67 {
  68         switch (cmd.action) {
  69
  70         case LFUN_INSET_MODIFY: {
  71                 InsetCommandParams p(BIBTEX_CODE);
  72                 try {
  73                         if (!InsetCommand::string2params("bibtex",
  74                                         to_utf8(cmd.argument()), p)) {
  75                                 cur.noUpdate();
  76                                 break;
  77                         }
  78                 } catch (ExceptionMessage const & message) {
  79                         if (message.type_ == WarningException) {
  80                                 Alert::warning(message.title_, message.details_);
  81                                 cur.noUpdate();
  82                         } else
  83                                 throw message;
  84                         break;
  85                 }
  86                 //
  87                 setParams(p);
  88                 buffer().updateBibfilesCache();
  89                 break;
  90         }
  91
  92         default:
  93                 InsetCommand::doDispatch(cur, cmd);
  94                 break;
  95         }
  96 }
  97
  98
  99 docstring InsetBibtex::screenLabel() const
 100 {
 101         return _("BibTeX Generated Bibliography");
 102 }
 103
 104
 105 docstring InsetBibtex::toolTip(BufferView const & /*bv*/, int /*x*/, int /*y*/) const
 106 {
 107         docstring item = from_ascii("* ");
 108         docstring tip = _("Databases:\n");
 109         vector<docstring> bibfilelist = getVectorFromString(getParam("bibfiles"));
 110
 111         if (bibfilelist.empty()) {
 112                 tip += item;
 113                 tip += _("none");
 114         } else {
 115                 vector<docstring>::const_iterator it = bibfilelist.begin();
 116                 vector<docstring>::const_iterator en = bibfilelist.end();
 117                 for (; it != en; ++it) {
 118                         tip += item;
 119                         tip += *it + "\n";
 120                 }
 121         }
 122
 123         // Style-Options
 124         docstring style = getParam("options"); // maybe empty! and with bibtotoc
 125         docstring bibtotoc = from_ascii("bibtotoc");
 126         if (prefixIs(style, bibtotoc)) {
 127                 if (contains(style, char_type(',')))
 128                         style = split(style, bibtotoc, char_type(','));
 129         }
 130
 131         tip += _("Style File:\n");
 132         tip += item;
 133         if (!style.empty())
 134                 tip += style;
 135         else
 136                 tip += _("none");
 137
 138         return tip;
 139 }
 140
 141
 142 static string normalizeName(Buffer const & buffer,
 143         OutputParams const & runparams, string const & name, string const & ext)
 144 {
 145         string const fname = makeAbsPath(name, buffer.filePath()).absFilename();
 146         if (FileName(name).isAbsolute() || !FileName(fname + ext).isReadableFile())
 147                 return name;
 148         if (!runparams.nice)
 149                 return fname;
 150
 151         // FIXME UNICODE
 152         return to_utf8(makeRelPath(from_utf8(fname),
 153                                          from_utf8(buffer.masterBuffer()->filePath())));
 154 }
 155
 156
 157 int InsetBibtex::latex(odocstream & os, OutputParams const & runparams) const
 158 {
 159         // the sequence of the commands:
 160         // 1. \bibliographystyle{style}
 161         // 2. \addcontentsline{...} - if option bibtotoc set
 162         // 3. \bibliography{database}
 163         // and with bibtopic:
 164         // 1. \bibliographystyle{style}
 165         // 2. \begin{btSect}{database}
 166         // 3. \btPrint{Cited|NotCited|All}
 167         // 4. \end{btSect}
 168
 169         // Database(s)
 170         // If we are processing the LaTeX file in a temp directory then
 171         // copy the .bib databases to this temp directory, mangling their
 172         // names in the process. Store this mangled name in the list of
 173         // all databases.
 174         // (We need to do all this because BibTeX *really*, *really*
 175         // can't handle "files with spaces" and Windows users tend to
 176         // use such filenames.)
 177         // Otherwise, store the (maybe absolute) path to the original,
 178         // unmangled database name.
 179         vector<docstring> bibfilelist = getVectorFromString(getParam("bibfiles"));
 180         vector<docstring>::const_iterator it = bibfilelist.begin();
 181         vector<docstring>::const_iterator en = bibfilelist.end();
 182         odocstringstream dbs;
 183         bool didone = false;
 184
 185         for (; it != en; ++it) {
 186                 string utf8input = to_utf8(*it);
 187                 string database =
 188                         normalizeName(buffer(), runparams, utf8input, ".bib");
 189                 FileName const try_in_file =
 190                         makeAbsPath(database + ".bib", buffer().filePath());
 191                 bool const not_from_texmf = try_in_file.isReadableFile();
 192
 193                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 194                     not_from_texmf) {
 195
 196                         // mangledFilename() needs the extension
 197                         DocFileName const in_file = DocFileName(try_in_file);
 198                         database = removeExtension(in_file.mangledFilename());
 199                         FileName const out_file = makeAbsPath(database + ".bib",
 200                                         buffer().masterBuffer()->temppath());
 201
 202                         bool const success = in_file.copyTo(out_file);
 203                         if (!success) {
 204                                 lyxerr << "Failed to copy '" << in_file
 205                                        << "' to '" << out_file << "'"
 206                                        << endl;
 207                         }
 208                 } else if (!runparams.inComment && runparams.nice && not_from_texmf &&
 209                            !isValidLaTeXFilename(database)) {
 210                                 frontend::Alert::warning(_("Invalid filename"),
 211                                                          _("The following filename is likely to cause trouble "
 212                                                            "when running the exported file through LaTeX: ") +
 213                                                             from_utf8(database));
 214                 }
 215
 216                 if (didone)
 217                         dbs << ',';
 218                 else
 219                         didone = true;
 220                 // FIXME UNICODE
 221                 dbs << from_utf8(latex_path(database));
 222         }
 223         docstring const db_out = dbs.str();
 224
 225         // Post this warning only once.
 226         static bool warned_about_spaces = false;
 227         if (!warned_about_spaces &&
 228             runparams.nice && db_out.find(' ') != docstring::npos) {
 229                 warned_about_spaces = true;
 230
 231                 Alert::warning(_("Export Warning!"),
 232                                _("There are spaces in the paths to your BibTeX databases.\n"
 233                                               "BibTeX will be unable to find them."));
 234         }
 235         // Style-Options
 236         string style = to_utf8(getParam("options")); // maybe empty! and with bibtotoc
 237         string bibtotoc;
 238         if (prefixIs(style, "bibtotoc")) {
 239                 bibtotoc = "bibtotoc";
 240                 if (contains(style, ','))
 241                         style = split(style, bibtotoc, ',');
 242         }
 243
 244
 245         // line count
 246         int nlines = 0;
 247
 248         if (!style.empty()) {
 249                 string base = normalizeName(buffer(), runparams, style, ".bst");
 250                 FileName const try_in_file =
 251                         makeAbsPath(base + ".bst", buffer().filePath());
 252                 bool const not_from_texmf = try_in_file.isReadableFile();
 253                 // If this style does not come from texmf and we are not
 254                 // exporting to .tex copy it to the tmp directory.
 255                 // This prevents problems with spaces and 8bit charcaters
 256                 // in the file name.
 257                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 258                     not_from_texmf) {
 259                         // use new style name
 260                         DocFileName const in_file = DocFileName(try_in_file);
 261                         base = removeExtension(in_file.mangledFilename());
 262                         FileName const out_file = makeAbsPath(base + ".bst",
 263                                         buffer().masterBuffer()->temppath());
 264                         bool const success = in_file.copyTo(out_file);
 265                         if (!success) {
 266                                 lyxerr << "Failed to copy '" << in_file
 267                                        << "' to '" << out_file << "'"
 268                                        << endl;
 269                         }
 270                 }
 271                 // FIXME UNICODE
 272                 os << "\\bibliographystyle{"
 273                    << from_utf8(latex_path(normalizeName(buffer(), runparams, base, ".bst")))
 274                    << "}\n";
 275                 nlines += 1;
 276         }
 277
 278         // Post this warning only once.
 279         static bool warned_about_bst_spaces = false;
 280         if (!warned_about_bst_spaces && runparams.nice && contains(style, ' ')) {
 281                 warned_about_bst_spaces = true;
 282                 Alert::warning(_("Export Warning!"),
 283                                _("There are spaces in the path to your BibTeX style file.\n"
 284                                               "BibTeX will be unable to find it."));
 285         }
 286
 287         if (!db_out.empty() && buffer().params().use_bibtopic) {
 288                 os << "\\begin{btSect}{" << db_out << "}\n";
 289                 docstring btprint = getParam("btprint");
 290                 if (btprint.empty())
 291                         // default
 292                         btprint = from_ascii("btPrintCited");
 293                 os << "\\" << btprint << "\n"
 294                    << "\\end{btSect}\n";
 295                 nlines += 3;
 296         }
 297
 298         // bibtotoc-Option
 299         if (!bibtotoc.empty() && !buffer().params().use_bibtopic) {
 300                 if (buffer().params().documentClass().hasLaTeXLayout("chapter")) {
 301                         if (buffer().params().sides == OneSide) {
 302                                 // oneside
 303                                 os << "\\clearpage";
 304                         } else {
 305                                 // twoside
 306                                 os << "\\cleardoublepage";
 307                         }
 308                         os << "\\addcontentsline{toc}{chapter}{\\bibname}";
 309                 } else if (buffer().params().documentClass().hasLaTeXLayout("section"))
 310                         os << "\\addcontentsline{toc}{section}{\\refname}";
 311         }
 312
 313         if (!db_out.empty() && !buffer().params().use_bibtopic) {
 314                 docstring btprint = getParam("btprint");
 315                 if (btprint == "btPrintAll") {
 316                         os << "\\nocite{*}\n";
 317                         nlines += 1;
 318                 }
 319                 os << "\\bibliography{" << db_out << "}\n";
 320                 nlines += 1;
 321         }
 322
 323         return nlines;
 324 }
 325
 326
 327 support::FileNameList InsetBibtex::getBibFiles() const
 328 {
 329         FileName path(buffer().filePath());
 330         support::PathChanger p(path);
 331
 332         support::FileNameList vec;
 333
 334         vector<docstring> bibfilelist = getVectorFromString(getParam("bibfiles"));
 335         vector<docstring>::const_iterator it = bibfilelist.begin();
 336         vector<docstring>::const_iterator en = bibfilelist.end();
 337         for (; it != en; ++it) {
 338                 FileName const file =
 339                         findtexfile(changeExtension(to_utf8(*it), "bib"), "bib");
 340
 341                 // If we didn't find a matching file name just fail silently
 342                 if (!file.empty())
 343                         vec.push_back(file);
 344         }
 345
 346         return vec;
 347
 348 }
 349
 350 namespace {
 351
 352         // methods for parsing bibtex files
 353
 354         typedef map<docstring, docstring> VarMap;
 355
 356         /// remove whitespace characters, optionally a single comma,
 357         /// and further whitespace characters from the stream.
 358         /// @return true if a comma was found, false otherwise
 359         ///
 360         bool removeWSAndComma(idocfstream & ifs) {
 361                 char_type ch;
 362
 363                 if (!ifs)
 364                         return false;
 365
 366                 // skip whitespace
 367                 do {
 368                         ifs.get(ch);
 369                 } while (ifs && isSpace(ch));
 370
 371                 if (!ifs)
 372                         return false;
 373
 374                 if (ch != ',') {
 375                         ifs.putback(ch);
 376                         return false;
 377                 }
 378
 379                 // skip whitespace
 380                 do {
 381                         ifs.get(ch);
 382                 } while (ifs && isSpace(ch));
 383
 384                 if (ifs) {
 385                         ifs.putback(ch);
 386                 }
 387
 388                 return true;
 389         }
 390
 391
 392         enum charCase {
 393                 makeLowerCase,
 394                 keepCase
 395         };
 396
 397         /// remove whitespace characters, read characer sequence
 398         /// not containing whitespace characters or characters in
 399         /// delimChars, and remove further whitespace characters.
 400         ///
 401         /// @return true if a string of length > 0 could be read.
 402         ///
 403         bool readTypeOrKey(docstring & val, idocfstream & ifs,
 404                 docstring const & delimChars, docstring const &illegalChars,
 405                 charCase chCase) {
 406
 407                 char_type ch;
 408
 409                 val.clear();
 410
 411                 if (!ifs)
 412                         return false;
 413
 414                 // skip whitespace
 415                 do {
 416                         ifs.get(ch);
 417                 } while (ifs && isSpace(ch));
 418
 419                 if (!ifs)
 420                         return false;
 421
 422                 // read value
 423                 bool legalChar = true;
 424                 while (ifs && !isSpace(ch) &&
 425                                                  delimChars.find(ch) == docstring::npos &&
 426                                                  (legalChar = (illegalChars.find(ch) == docstring::npos))
 427                                         )
 428                 {
 429                         if (chCase == makeLowerCase)
 430                                 val += lowercase(ch);
 431                         else
 432                                 val += ch;
 433                         ifs.get(ch);
 434                 }
 435
 436                 if (!legalChar) {
 437                         ifs.putback(ch);
 438                         return false;
 439                 }
 440
 441                 // skip whitespace
 442                 while (ifs && isSpace(ch)) {
 443                         ifs.get(ch);
 444                 }
 445
 446                 if (ifs) {
 447                         ifs.putback(ch);
 448                 }
 449
 450                 return val.length() > 0;
 451         }
 452
 453         /// read subsequent bibtex values that are delimited with a #-character.
 454         /// Concatenate all parts and replace names with the associated string in
 455         /// the variable strings.
 456         /// @return true if reading was successfull (all single parts were delimited
 457         /// correctly)
 458         bool readValue(docstring & val, idocfstream & ifs, const VarMap & strings) {
 459
 460                 char_type ch;
 461
 462                 val.clear();
 463
 464                 if (!ifs)
 465                         return false;
 466
 467                 do {
 468                         // skip whitespace
 469                         do {
 470                                 ifs.get(ch);
 471                         } while (ifs && isSpace(ch));
 472
 473                         if (!ifs)
 474                                 return false;
 475
 476                         // check for field type
 477                         if (isDigit(ch)) {
 478
 479                                 // read integer value
 480                                 do {
 481                                         val += ch;
 482                                         ifs.get(ch);
 483                                 } while (ifs && isDigit(ch));
 484
 485                                 if (!ifs)
 486                                         return false;
 487
 488                         } else if (ch == '"' || ch == '{') {
 489                                 // set end delimiter
 490                                 char_type delim = ch == '"' ? '"': '}';
 491
 492                                 //Skip whitespace
 493                                 do {
 494                                         ifs.get(ch);
 495                                 } while (ifs && isSpace(ch));
 496
 497                                 if (!ifs)
 498                                         return false;
 499
 500                                 //We now have the first non-whitespace character
 501                                 //We'll collapse adjacent whitespace.
 502                                 bool lastWasWhiteSpace = false;
 503
 504                                 // inside this delimited text braces must match.
 505                                 // Thus we can have a closing delimiter only
 506                                 // when nestLevel == 0
 507                                 int nestLevel = 0;
 508
 509                                 while (ifs && (nestLevel > 0 || ch != delim)) {
 510                                         if (isSpace(ch)) {
 511                                                 lastWasWhiteSpace = true;
 512                                                 ifs.get(ch);
 513                                                 continue;
 514                                         }
 515                                         //We output the space only after we stop getting
 516                                         //whitespace so as not to output any whitespace
 517                                         //at the end of the value.
 518                                         if (lastWasWhiteSpace) {
 519                                                 lastWasWhiteSpace = false;
 520                                                 val += ' ';
 521                                         }
 522
 523                                         val += ch;
 524
 525                                         // update nesting level
 526                                         switch (ch) {
 527                                                 case '{':
 528                                                         ++nestLevel;
 529                                                         break;
 530                                                 case '}':
 531                                                         --nestLevel;
 532                                                         if (nestLevel < 0) return false;
 533                                                         break;
 534                                         }
 535
 536                                         ifs.get(ch);
 537                                 }
 538
 539                                 if (!ifs)
 540                                         return false;
 541
 542                                 ifs.get(ch);
 543
 544                                 if (!ifs)
 545                                         return false;
 546
 547                         } else {
 548
 549                                 // reading a string name
 550                                 docstring strName;
 551
 552                                 while (ifs && !isSpace(ch) && ch != '#' && ch != ',' && ch != '}' && ch != ')') {
 553                                         strName += lowercase(ch);
 554                                         ifs.get(ch);
 555                                 }
 556
 557                                 if (!ifs)
 558                                         return false;
 559
 560                                 // replace the string with its assigned value or
 561                                 // discard it if it's not assigned
 562                                 if (strName.length()) {
 563                                         VarMap::const_iterator pos = strings.find(strName);
 564                                         if (pos != strings.end()) {
 565                                                 val += pos->second;
 566                                         }
 567                                 }
 568                         }
 569
 570                         // skip WS
 571                         while (ifs && isSpace(ch)) {
 572                                 ifs.get(ch);
 573                         }
 574
 575                         if (!ifs)
 576                                 return false;
 577
 578                         // continue reading next value on concatenate with '#'
 579                 } while (ch == '#');
 580
 581                 ifs.putback(ch);
 582
 583                 return true;
 584         }
 585 }
 586
 587
 588 // This method returns a comma separated list of Bibtex entries
 589 void InsetBibtex::fillWithBibKeys(BiblioInfo & keylist,
 590         InsetIterator const & /*di*/) const
 591 {
 592         // This bibtex parser is a first step to parse bibtex files
 593         // more precisely.
 594         //
 595         // - it reads the whole bibtex entry and does a syntax check
 596         //   (matching delimiters, missing commas,...
 597         // - it recovers from errors starting with the next @-character
 598         // - it reads @string definitions and replaces them in the
 599         //   field values.
 600         // - it accepts more characters in keys or value names than
 601         //   bibtex does.
 602         //
 603         // Officially bibtex does only support ASCII, but in practice
 604         // you can use the encoding of the main document as long as
 605         // some elements like keys and names are pure ASCII. Therefore
 606         // we convert the file from the buffer encoding.
 607         // We don't restrict keys to ASCII in LyX, since our own
 608         // InsetBibitem can generate non-ASCII keys, and nonstandard
 609         // 8bit clean bibtex forks exist.
 610         support::FileNameList const files = getBibFiles();
 611         support::FileNameList::const_iterator it = files.begin();
 612         support::FileNameList::const_iterator en = files.end();
 613         for (; it != en; ++ it) {
 614                 idocfstream ifs(it->toFilesystemEncoding().c_str(),
 615                         ios_base::in, buffer().params().encoding().iconvName());
 616
 617                 char_type ch;
 618                 VarMap strings;
 619
 620                 while (ifs) {
 621
 622                         ifs.get(ch);
 623                         if (!ifs)
 624                                 break;
 625
 626                         if (ch != '@')
 627                                 continue;
 628
 629                         docstring entryType;
 630
 631                         if (!readTypeOrKey(entryType, ifs, from_ascii("{("),
 632                                            docstring(), makeLowerCase) || !ifs)
 633                                 continue;
 634
 635                         if (entryType == from_ascii("comment")) {
 636
 637                                 ifs.ignore(numeric_limits<int>::max(), '\n');
 638                                 continue;
 639                         }
 640
 641                         ifs.get(ch);
 642                         if (!ifs)
 643                                 break;
 644
 645                         if ((ch != '(') && (ch != '{')) {
 646                                 // invalid entry delimiter
 647                                 ifs.putback(ch);
 648                                 continue;
 649                         }
 650
 651                         // process the entry
 652                         if (entryType == from_ascii("string")) {
 653
 654                                 // read string and add it to the strings map
 655                                 // (or replace it's old value)
 656                                 docstring name;
 657                                 docstring value;
 658
 659                                 if (!readTypeOrKey(name, ifs, from_ascii("="),
 660                                                    from_ascii("#{}(),"), makeLowerCase) || !ifs)
 661                                         continue;
 662
 663                                 // next char must be an equal sign
 664                                 ifs.get(ch);
 665                                 if (!ifs || ch != '=')
 666                                         continue;
 667
 668                                 if (!readValue(value, ifs, strings))
 669                                         continue;
 670
 671                                 strings[name] = value;
 672
 673                         } else if (entryType == from_ascii("preamble")) {
 674
 675                                 // preamble definitions are discarded.
 676                                 // can they be of any use in lyx?
 677                                 docstring value;
 678
 679                                 if (!readValue(value, ifs, strings))
 680                                         continue;
 681
 682                         } else {
 683
 684                                 // Citation entry. Try to read the key.
 685                                 docstring key;
 686
 687                                 if (!readTypeOrKey(key, ifs, from_ascii(","),
 688                                                    from_ascii("}"), keepCase) || !ifs)
 689                                         continue;
 690
 691                                 /////////////////////////////////////////////
 692                                 // now we have a key, so we will add an entry
 693                                 // (even if it's empty, as bibtex does)
 694                                 //
 695                                 // we now read the field = value pairs.
 696                                 // all items must be separated by a comma. If
 697                                 // it is missing the scanning of this entry is
 698                                 // stopped and the next is searched.
 699                                 docstring fields;
 700                                 docstring name;
 701                                 docstring value;
 702                                 docstring commaNewline;
 703                                 docstring data;
 704                                 BibTeXInfo keyvalmap(key, entryType);
 705
 706                                 bool readNext = removeWSAndComma(ifs);
 707
 708                                 while (ifs && readNext) {
 709
 710                                         // read field name
 711                                         if (!readTypeOrKey(name, ifs, from_ascii("="),
 712                                                            from_ascii("{}(),"), makeLowerCase) || !ifs)
 713                                                 break;
 714
 715                                         // next char must be an equal sign
 716                                         ifs.get(ch);
 717                                         if (!ifs)
 718                                                 break;
 719                                         if (ch != '=') {
 720                                                 ifs.putback(ch);
 721                                                 break;
 722                                         }
 723
 724                                         // read field value
 725                                         if (!readValue(value, ifs, strings))
 726                                                 break;
 727
 728                                         keyvalmap[name] = value;
 729                                         data += "\n\n" + value;
 730                                         keylist.addFieldName(name);
 731                                         readNext = removeWSAndComma(ifs);
 732                                 }
 733
 734                                 // add the new entry
 735                                 keylist.addEntryType(entryType);
 736                                 keyvalmap.setAllData(data);
 737                                 keylist[key] = keyvalmap;
 738                         }
 739                 } //< searching '@'
 740         } //< for loop over files
 741 }
 742
 743
 744 FileName InsetBibtex::getBibTeXPath(docstring const & filename, Buffer const & buf)
 745 {
 746         string texfile = changeExtension(to_utf8(filename), "bib");
 747         // note that, if the filename can be found directly from the path,
 748         // findtexfile will just return a FileName object for that path.
 749         FileName file(findtexfile(texfile, "bib"));
 750         if (file.empty())
 751                 file = FileName(makeAbsPath(texfile, buf.filePath()));
 752         return file;
 753 }
 754
 755
 756 bool InsetBibtex::addDatabase(docstring const & db)
 757 {
 758         docstring bibfiles = getParam("bibfiles");
 759         if (tokenPos(bibfiles, ',', db) != -1)
 760                 return false;
 761         if (!bibfiles.empty())
 762                 bibfiles += ',';
 763         setParam("bibfiles", bibfiles + db);
 764         return true;
 765 }
 766
 767
 768 bool InsetBibtex::delDatabase(docstring const & db)
 769 {
 770         docstring bibfiles = getParam("bibfiles");
 771         if (contains(bibfiles, db)) {
 772                 int const n = tokenPos(bibfiles, ',', db);
 773                 docstring bd = db;
 774                 if (n > 0) {
 775                         // this is not the first database
 776                         docstring tmp = ',' + bd;
 777                         setParam("bibfiles", subst(bibfiles, tmp, docstring()));
 778                 } else if (n == 0)
 779                         // this is the first (or only) database
 780                         setParam("bibfiles", split(bibfiles, bd, ','));
 781                 else
 782                         return false;
 783         }
 784         return true;
 785 }
 786
 787
 788 void InsetBibtex::validate(LaTeXFeatures & features) const
 789 {
 790         if (features.bufferParams().use_bibtopic)
 791                 features.require("bibtopic");
 792 }
 793
 794
 795 } // namespace lyx