src/insets/InsetExternal.cpp

   1 /**
   2  * \file InsetExternal.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Asger Alstrup Nielsen
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "InsetExternal.h"
  14 #include "insets/ExternalSupport.h"
  15 #include "insets/ExternalTemplate.h"
  16 #include "insets/RenderButton.h"
  17 #include "insets/RenderGraphic.h"
  18 #include "insets/RenderPreview.h"
  19
  20 #include "Buffer.h"
  21 #include "Cursor.h"
  22 #include "debug.h"
  23 #include "DispatchResult.h"
  24 #include "Exporter.h"
  25 #include "FuncStatus.h"
  26 #include "FuncRequest.h"
  27 #include "gettext.h"
  28 #include "LaTeXFeatures.h"
  29 #include "LyX.h"
  30 #include "Lexer.h"
  31 #include "LyXRC.h"
  32 #include "MetricsInfo.h"
  33 #include "OutputParams.h"
  34
  35 #include "graphics/PreviewLoader.h"
  36
  37 #include "support/filetools.h"
  38 #include "support/lstrings.h"
  39 #include "support/lyxlib.h"
  40 #include "support/convert.h"
  41 #include "support/Translator.h"
  42
  43 #include <boost/bind.hpp>
  44
  45 #include <sstream>
  46
  47 using std::endl;
  48 using std::string;
  49 using std::auto_ptr;
  50 using std::istringstream;
  51 using std::ostream;
  52 using std::ostringstream;
  53 using std::vector;
  54
  55
  56 namespace {
  57
  58 lyx::external::DisplayType const defaultDisplayType = lyx::external::NoDisplay;
  59
  60 unsigned int const defaultLyxScale = 100;
  61
  62 string defaultTemplateName = "RasterImage";
  63
  64 } // namespace anon
  65
  66
  67 namespace lyx {
  68
  69 namespace external {
  70
  71 TempName::TempName()
  72 {
  73         support::FileName const tempname(support::tempName(support::FileName(), "lyxext"));
  74         // FIXME: This is unsafe
  75         support::unlink(tempname);
  76         // must have an extension for the converter code to work correctly.
  77         tempname_ = support::FileName(tempname.absFilename() + ".tmp");
  78 }
  79
  80
  81 TempName::TempName(TempName const &)
  82 {
  83         tempname_ = TempName()();
  84 }
  85
  86
  87 TempName::~TempName()
  88 {
  89         support::unlink(tempname_);
  90 }
  91
  92
  93 TempName &
  94 TempName::operator=(TempName const & other)
  95 {
  96         if (this != &other)
  97                 tempname_ = TempName()();
  98         return *this;
  99 }
 100
 101
 102 namespace {
 103
 104 /// The translator between the Display enum and corresponding lyx string.
 105 Translator<DisplayType, string> const initTranslator()
 106 {
 107         Translator<DisplayType, string> translator(DefaultDisplay, "default");
 108
 109         // Fill the display translator
 110         translator.addPair(MonochromeDisplay, "monochrome");
 111         translator.addPair(GrayscaleDisplay, "grayscale");
 112         translator.addPair(ColorDisplay, "color");
 113         translator.addPair(PreviewDisplay, "preview");
 114         translator.addPair(NoDisplay, "none");
 115
 116         return translator;
 117 }
 118
 119 } // namespace anon
 120
 121
 122 Translator<DisplayType, string> const & displayTranslator()
 123 {
 124         static Translator<DisplayType, string> const translator =
 125                 initTranslator();
 126         return translator;
 127 }
 128
 129 } // namespace external
 130
 131
 132 InsetExternalParams::InsetExternalParams()
 133         : display(defaultDisplayType),
 134           lyxscale(defaultLyxScale),
 135           draft(false),
 136           templatename_(defaultTemplateName)
 137 {}
 138
 139
 140 namespace {
 141
 142 template <typename T>
 143 void clearIfNotFound(T & data, external::TransformID value,
 144                      vector<external::TransformID> const & ids)
 145 {
 146         typedef vector<external::TransformID>::const_iterator
 147                 const_iterator;
 148
 149         const_iterator it  = ids.begin();
 150         const_iterator end = ids.end();
 151         it = std::find(it, end, value);
 152         if (it == end)
 153                 data = T();
 154 }
 155
 156 } // namespace anon
 157
 158
 159 void InsetExternalParams::settemplate(string const & name)
 160 {
 161         templatename_ = name;
 162
 163         external::TemplateManager const & etm =
 164                 external::TemplateManager::get();
 165         external::Template const * const et = etm.getTemplateByName(name);
 166         if (!et)
 167                 // Be safe. Don't lose data.
 168                 return;
 169
 170         // Ascertain which transforms the template supports.
 171         // Empty all those that it doesn't.
 172         vector<external::TransformID> const & ids = et->transformIds;
 173         clearIfNotFound(clipdata,     external::Clip,   ids);
 174         clearIfNotFound(extradata,    external::Extra,  ids);
 175         clearIfNotFound(resizedata,   external::Resize, ids);
 176         clearIfNotFound(rotationdata, external::Rotate, ids);
 177 }
 178
 179
 180 void InsetExternalParams::write(Buffer const & buffer, ostream & os) const
 181 {
 182         os << "External\n"
 183            << "\ttemplate " << templatename() << '\n';
 184
 185         if (!filename.empty())
 186                 os << "\tfilename "
 187                    << filename.outputFilename(buffer.filePath())
 188                    << '\n';
 189
 190         if (display != defaultDisplayType)
 191                 os << "\tdisplay "
 192                    << external::displayTranslator().find(display)
 193                    << '\n';
 194
 195         if (lyxscale != defaultLyxScale)
 196                 os << "\tlyxscale " << convert<string>(lyxscale) << '\n';
 197
 198         if (draft)
 199                 os << "\tdraft\n";
 200
 201         if (!clipdata.bbox.empty())
 202                 os << "\tboundingBox " << clipdata.bbox << '\n';
 203         if (clipdata.clip)
 204                 os << "\tclip\n";
 205
 206         external::ExtraData::const_iterator it  = extradata.begin();
 207         external::ExtraData::const_iterator end = extradata.end();
 208         for (; it != end; ++it) {
 209                 if (!it->second.empty())
 210                         os << "\textra " << it->first << " \""
 211                            << it->second << "\"\n";
 212         }
 213
 214         if (!rotationdata.no_rotation()) {
 215                 os << "\trotateAngle " << rotationdata.adjAngle() << '\n';
 216                 if (rotationdata.origin() != external::RotationData::DEFAULT)
 217                         os << "\trotateOrigin "
 218                            << rotationdata.originString() << '\n';
 219         }
 220
 221         if (!resizedata.no_resize()) {
 222                 using support::float_equal;
 223                 double const scl = convert<double>(resizedata.scale);
 224                 if (!float_equal(scl, 0.0, 0.05)) {
 225                         if (!float_equal(scl, 100.0, 0.05))
 226                                 os << "\tscale "
 227                                    << resizedata.scale << '\n';
 228                 } else {
 229                         if (!resizedata.width.zero())
 230                                 os << "\twidth "
 231                                    << resizedata.width.asString() << '\n';
 232                         if (!resizedata.height.zero())
 233                                 os << "\theight "
 234                                    << resizedata.height.asString() << '\n';
 235                 }
 236                 if (resizedata.keepAspectRatio)
 237                         os << "\tkeepAspectRatio\n";
 238         }
 239 }
 240
 241
 242 bool InsetExternalParams::read(Buffer const & buffer, Lexer & lex)
 243 {
 244         enum ExternalTags {
 245                 EX_TEMPLATE = 1,
 246                 EX_FILENAME,
 247                 EX_DISPLAY,
 248                 EX_LYXSCALE,
 249                 EX_DRAFT,
 250                 EX_BOUNDINGBOX,
 251                 EX_CLIP,
 252                 EX_EXTRA,
 253                 EX_HEIGHT,
 254                 EX_KEEPASPECTRATIO,
 255                 EX_ROTATEANGLE,
 256                 EX_ROTATEORIGIN,
 257                 EX_SCALE,
 258                 EX_WIDTH,
 259                 EX_END
 260         };
 261
 262         keyword_item external_tags[] = {
 263                 { "\\end_inset",     EX_END },
 264                 { "boundingBox",     EX_BOUNDINGBOX },
 265                 { "clip",            EX_CLIP },
 266                 { "display",         EX_DISPLAY},
 267                 { "draft",           EX_DRAFT},
 268                 { "extra",           EX_EXTRA },
 269                 { "filename",        EX_FILENAME},
 270                 { "height",          EX_HEIGHT },
 271                 { "keepAspectRatio", EX_KEEPASPECTRATIO },
 272                 { "lyxscale",        EX_LYXSCALE},
 273                 { "rotateAngle",     EX_ROTATEANGLE },
 274                 { "rotateOrigin",    EX_ROTATEORIGIN },
 275                 { "scale",           EX_SCALE },
 276                 { "template",        EX_TEMPLATE },
 277                 { "width",           EX_WIDTH }
 278         };
 279
 280         PushPopHelper pph(lex, external_tags, EX_END);
 281
 282         bool found_end  = false;
 283         bool read_error = false;
 284
 285         while (lex.isOK()) {
 286                 switch (lex.lex()) {
 287                 case EX_TEMPLATE:
 288                         lex.next();
 289                         templatename_ = lex.getString();
 290                         break;
 291
 292                 case EX_FILENAME: {
 293                         lex.eatLine();
 294                         string const name = lex.getString();
 295                         filename.set(name, buffer.filePath());
 296                         break;
 297                 }
 298
 299                 case EX_DISPLAY: {
 300                         lex.next();
 301                         string const name = lex.getString();
 302                         display = external::displayTranslator().find(name);
 303                         break;
 304                 }
 305
 306                 case EX_LYXSCALE:
 307                         lex.next();
 308                         lyxscale = lex.getInteger();
 309                         break;
 310
 311                 case EX_DRAFT:
 312                         draft = true;
 313                         break;
 314
 315                 case EX_BOUNDINGBOX:
 316                         lex.next();
 317                         clipdata.bbox.xl = lex.getInteger();
 318                         lex.next();
 319                         clipdata.bbox.yb = lex.getInteger();
 320                         lex.next();
 321                         clipdata.bbox.xr = lex.getInteger();
 322                         lex.next();
 323                         clipdata.bbox.yt = lex.getInteger();
 324                         break;
 325
 326                 case EX_CLIP:
 327                         clipdata.clip = true;
 328                         break;
 329
 330                 case EX_EXTRA: {
 331                         lex.next();
 332                         string const name = lex.getString();
 333                         lex.next();
 334                         extradata.set(name, lex.getString());
 335                         break;
 336                 }
 337
 338                 case EX_HEIGHT:
 339                         lex.next();
 340                         resizedata.height = Length(lex.getString());
 341                         break;
 342
 343                 case EX_KEEPASPECTRATIO:
 344                         resizedata.keepAspectRatio = true;
 345                         break;
 346
 347                 case EX_ROTATEANGLE:
 348                         lex.next();
 349                         rotationdata.angle = lex.getString();
 350                         break;
 351
 352                 case EX_ROTATEORIGIN:
 353                         lex.next();
 354                         rotationdata.origin(lex.getString());
 355                         break;
 356
 357                 case EX_SCALE:
 358                         lex.next();
 359                         resizedata.scale = lex.getString();
 360                         break;
 361
 362                 case EX_WIDTH:
 363                         lex.next();
 364                         resizedata.width = Length(lex.getString());
 365                         break;
 366
 367                 case EX_END:
 368                         found_end = true;
 369                         break;
 370
 371                 default:
 372                         lex.printError("ExternalInset::read: "
 373                                        "Wrong tag: $$Token");
 374                         read_error = true;
 375                         break;
 376                 }
 377
 378                 if (found_end || read_error)
 379                         break;
 380         }
 381
 382         if (!found_end)
 383                 lex.printError("ExternalInsetParams::read: Missing \\end_inset.");
 384
 385         // This is a trick to make sure that the data are self-consistent.
 386         settemplate(templatename_);
 387
 388         if (lyxerr.debugging(Debug::EXTERNAL)) {
 389                 lyxerr  << "InsetExternalParams::read:\n";
 390                 write(buffer, lyxerr);
 391         }
 392
 393         return !read_error;
 394 }
 395
 396
 397 InsetExternal::InsetExternal()
 398         : renderer_(new RenderButton)
 399 {}
 400
 401
 402 InsetExternal::InsetExternal(InsetExternal const & other)
 403         : Inset(other),
 404           boost::signals::trackable(),
 405           params_(other.params_),
 406           renderer_(other.renderer_->clone(this))
 407 {}
 408
 409
 410 auto_ptr<Inset> InsetExternal::doClone() const
 411 {
 412         return auto_ptr<Inset>(new InsetExternal(*this));
 413 }
 414
 415
 416 InsetExternal::~InsetExternal()
 417 {
 418         InsetExternalMailer(*this).hideDialog();
 419 }
 420
 421
 422 void InsetExternal::statusChanged() const
 423 {
 424         LyX::cref().updateInset(this);
 425 }
 426
 427
 428 void InsetExternal::doDispatch(Cursor & cur, FuncRequest & cmd)
 429 {
 430         switch (cmd.action) {
 431
 432         case LFUN_EXTERNAL_EDIT: {
 433                 Buffer const & buffer = cur.buffer();
 434                 InsetExternalParams p;
 435                 InsetExternalMailer::string2params(to_utf8(cmd.argument()), buffer, p);
 436                 external::editExternal(p, buffer);
 437                 break;
 438         }
 439
 440         case LFUN_INSET_MODIFY: {
 441                 Buffer const & buffer = cur.buffer();
 442                 InsetExternalParams p;
 443                 InsetExternalMailer::string2params(to_utf8(cmd.argument()), buffer, p);
 444                 setParams(p, buffer);
 445                 break;
 446         }
 447
 448         case LFUN_INSET_DIALOG_UPDATE:
 449                 InsetExternalMailer(*this).updateDialog(&cur.bv());
 450                 break;
 451
 452         case LFUN_MOUSE_RELEASE:
 453                 if (!cur.selection())
 454                         InsetExternalMailer(*this).showDialog(&cur.bv());
 455                 break;
 456
 457         default:
 458                 Inset::doDispatch(cur, cmd);
 459         }
 460 }
 461
 462
 463 bool InsetExternal::getStatus(Cursor & cur, FuncRequest const & cmd,
 464                 FuncStatus & flag) const
 465 {
 466         switch (cmd.action) {
 467
 468         case LFUN_EXTERNAL_EDIT:
 469         case LFUN_INSET_MODIFY:
 470         case LFUN_INSET_DIALOG_UPDATE:
 471                 flag.enabled(true);
 472                 return true;
 473
 474         default:
 475                 return Inset::getStatus(cur, cmd, flag);
 476         }
 477 }
 478
 479
 480 void InsetExternal::edit(Cursor & cur, bool)
 481 {
 482         InsetExternalMailer(*this).showDialog(&cur.bv());
 483 }
 484
 485
 486 bool InsetExternal::metrics(MetricsInfo & mi, Dimension & dim) const
 487 {
 488         renderer_->metrics(mi, dim);
 489         bool const changed = dim_ != dim;
 490         dim_ = dim;
 491         return changed;
 492 }
 493
 494
 495 void InsetExternal::draw(PainterInfo & pi, int x, int y) const
 496 {
 497         setPosCache(pi, x, y);
 498         renderer_->draw(pi, x, y);
 499 }
 500
 501
 502 namespace {
 503
 504 enum RenderType {
 505         RENDERBUTTON,
 506         RENDERGRAPHIC,
 507         RENDERPREVIEW
 508 };
 509
 510
 511 RenderType getRenderType(InsetExternalParams const & p)
 512 {
 513         if (!external::getTemplatePtr(p) ||
 514             p.filename.empty() ||
 515             p.display == external::NoDisplay)
 516                 return RENDERBUTTON;
 517
 518         if (p.display == external::PreviewDisplay) {
 519                 if (RenderPreview::status() != LyXRC::PREVIEW_OFF)
 520                         return RENDERPREVIEW;
 521                 return RENDERBUTTON;
 522         }
 523
 524         if (p.display == external::DefaultDisplay &&
 525             lyxrc.display_graphics == graphics::NoDisplay)
 526                 return RENDERBUTTON;
 527         return RENDERGRAPHIC;
 528 }
 529
 530
 531 graphics::Params get_grfx_params(InsetExternalParams const & eparams)
 532 {
 533         graphics::Params gparams;
 534
 535         gparams.filename = eparams.filename;
 536         gparams.scale = eparams.lyxscale;
 537         if (eparams.clipdata.clip)
 538                 gparams.bb = eparams.clipdata.bbox;
 539         gparams.angle = convert<double>(eparams.rotationdata.adjAngle());
 540
 541         switch (eparams.display) {
 542         case external::DefaultDisplay:
 543                 gparams.display = graphics::DefaultDisplay;
 544                 break;
 545         case external::MonochromeDisplay:
 546                 gparams.display = graphics::MonochromeDisplay;
 547                 break;
 548         case external::GrayscaleDisplay:
 549                 gparams.display = graphics::GrayscaleDisplay;
 550                 break;
 551         case external::ColorDisplay:
 552                 gparams.display = graphics::ColorDisplay;
 553                 break;
 554         case external::NoDisplay:
 555                 gparams.display = graphics::NoDisplay;
 556                 break;
 557         default:
 558                 BOOST_ASSERT(false);
 559         }
 560         if (gparams.display == graphics::DefaultDisplay)
 561                 gparams.display = lyxrc.display_graphics;
 562         // Override the above if we're not using a gui
 563         if (!use_gui)
 564                 gparams.display = graphics::NoDisplay;
 565
 566         return gparams;
 567 }
 568
 569
 570 docstring const getScreenLabel(InsetExternalParams const & params,
 571                             Buffer const & buffer)
 572 {
 573         external::Template const * const ptr =
 574                 external::getTemplatePtr(params);
 575         if (!ptr)
 576                 // FIXME UNICODE
 577                 return support::bformat((_("External template %1$s is not installed")),
 578                                         from_utf8(params.templatename()));
 579         // FIXME UNICODE
 580         docstring gui = _(ptr->guiName);
 581         return from_utf8(external::doSubstitution(params, buffer,
 582                                 to_utf8(gui), false));
 583 }
 584
 585 void add_preview_and_start_loading(RenderMonitoredPreview &,
 586                                    InsetExternal const &,
 587                                    Buffer const &);
 588
 589 } // namespace anon
 590
 591
 592 InsetExternalParams const & InsetExternal::params() const
 593 {
 594         return params_;
 595 }
 596
 597
 598 void InsetExternal::setParams(InsetExternalParams const & p,
 599                               Buffer const & buffer)
 600 {
 601         params_ = p;
 602
 603         // Subsequent calls to the InsetExternal::Params default constructor
 604         // will use this.
 605         defaultTemplateName = params_.templatename();
 606
 607         switch (getRenderType(params_)) {
 608         case RENDERBUTTON: {
 609                 RenderButton * button_ptr = renderer_->asButton();
 610                 if (!button_ptr) {
 611                         renderer_.reset(new RenderButton);
 612                         button_ptr = renderer_->asButton();
 613                 }
 614
 615                 button_ptr->update(getScreenLabel(params_, buffer), true);
 616                 break;
 617
 618         } case RENDERGRAPHIC: {
 619                 RenderGraphic * graphic_ptr = renderer_->asGraphic();
 620                 if (!graphic_ptr) {
 621                         renderer_.reset(new RenderGraphic(this));
 622                         graphic_ptr = renderer_->asGraphic();
 623                 }
 624
 625                 graphic_ptr->update(get_grfx_params(params_));
 626
 627                 break;
 628
 629         } case RENDERPREVIEW: {
 630                 RenderMonitoredPreview * preview_ptr =
 631                         renderer_->asMonitoredPreview();
 632                 if (!preview_ptr) {
 633                         renderer_.reset(new RenderMonitoredPreview(this));
 634                         preview_ptr = renderer_->asMonitoredPreview();
 635                         preview_ptr->fileChanged(
 636                                 boost::bind(&InsetExternal::fileChanged, this));
 637                 }
 638
 639                 if (preview_ptr->monitoring())
 640                         preview_ptr->stopMonitoring();
 641                 add_preview_and_start_loading(*preview_ptr, *this, buffer);
 642
 643                 break;
 644         }
 645         }
 646 }
 647
 648
 649 void InsetExternal::fileChanged() const
 650 {
 651         Buffer const * const buffer_ptr = LyX::cref().updateInset(this);
 652         if (!buffer_ptr)
 653                 return;
 654
 655         RenderMonitoredPreview * const ptr = renderer_->asMonitoredPreview();
 656         BOOST_ASSERT(ptr);
 657
 658         Buffer const & buffer = *buffer_ptr;
 659         ptr->removePreview(buffer);
 660         add_preview_and_start_loading(*ptr, *this, buffer);
 661 }
 662
 663
 664 void InsetExternal::write(Buffer const & buffer, ostream & os) const
 665 {
 666         params_.write(buffer, os);
 667 }
 668
 669
 670 void InsetExternal::read(Buffer const & buffer, Lexer & lex)
 671 {
 672         InsetExternalParams params;
 673         if (params.read(buffer, lex))
 674                 setParams(params, buffer);
 675 }
 676
 677
 678 int InsetExternal::latex(Buffer const & buf, odocstream & os,
 679                          OutputParams const & runparams) const
 680 {
 681         if (params_.draft) {
 682                 // FIXME UNICODE
 683                 os << "\\fbox{\\ttfamily{}"
 684                    << from_utf8(params_.filename.outputFilename(buf.filePath()))
 685                    << "}\n";
 686                 return 1;
 687         }
 688
 689         // "nice" means that the buffer is exported to LaTeX format but not
 690         // run through the LaTeX compiler.
 691         // If we're running through the LaTeX compiler, we should write the
 692         // generated files in the buffer's temporary directory.
 693         bool const external_in_tmpdir = !runparams.nice;
 694         bool const dryrun = runparams.dryrun || runparams.inComment;
 695
 696         // If the template has specified a PDFLaTeX output, then we try and
 697         // use that.
 698         if (runparams.flavor == OutputParams::PDFLATEX) {
 699                 external::Template const * const et_ptr =
 700                         external::getTemplatePtr(params_);
 701                 if (!et_ptr)
 702                         return 0;
 703                 external::Template const & et = *et_ptr;
 704
 705                 external::Template::Formats::const_iterator cit =
 706                         et.formats.find("PDFLaTeX");
 707
 708                 if (cit != et.formats.end()) {
 709                         return external::writeExternal(params_, "PDFLaTeX",
 710                                                        buf, os,
 711                                                        *(runparams.exportdata),
 712                                                        external_in_tmpdir,
 713                                                        dryrun);
 714                 }
 715         }
 716
 717         return external::writeExternal(params_, "LaTeX", buf, os,
 718                                        *(runparams.exportdata),
 719                                        external_in_tmpdir,
 720                                        dryrun);
 721 }
 722
 723
 724 int InsetExternal::plaintext(Buffer const & buf, odocstream & os,
 725                              OutputParams const & runparams) const
 726 {
 727         os << '\n'; // output external material on a new line
 728         external::writeExternal(params_, "Ascii", buf, os,
 729                                 *(runparams.exportdata), false,
 730                                 runparams.dryrun || runparams.inComment);
 731         return PLAINTEXT_NEWLINE;
 732 }
 733
 734
 735 int InsetExternal::docbook(Buffer const & buf, odocstream & os,
 736                            OutputParams const & runparams) const
 737 {
 738         return external::writeExternal(params_, "DocBook", buf, os,
 739                                        *(runparams.exportdata), false,
 740                                        runparams.dryrun || runparams.inComment);
 741 }
 742
 743
 744 void InsetExternal::validate(LaTeXFeatures & features) const
 745 {
 746         if (params_.draft)
 747                 return;
 748
 749         external::Template const * const et_ptr =
 750                 external::getTemplatePtr(params_);
 751         if (!et_ptr)
 752                 return;
 753         external::Template const & et = *et_ptr;
 754
 755         string format;
 756         switch (features.runparams().flavor) {
 757         case OutputParams::LATEX:
 758                 format = "LaTeX";
 759                 break;
 760         case OutputParams::PDFLATEX:
 761                 format = "PDFLaTeX";
 762                 break;
 763         case OutputParams::XML:
 764                 format = "DocBook";
 765                 break;
 766         }
 767         external::Template::Formats::const_iterator cit =
 768                 et.formats.find(format);
 769         if (cit == et.formats.end())
 770                 return;
 771
 772         // FIXME: We don't need that always
 773         features.require("lyxdot");
 774
 775         vector<string>::const_iterator it  = cit->second.requirements.begin();
 776         vector<string>::const_iterator end = cit->second.requirements.end();
 777         for (; it != end; ++it)
 778                 features.require(*it);
 779
 780         external::TemplateManager & etm = external::TemplateManager::get();
 781
 782         it  = cit->second.preambleNames.begin();
 783         end = cit->second.preambleNames.end();
 784         for (; it != end; ++it) {
 785                 string const preamble = etm.getPreambleDefByName(*it);
 786                 if (!preamble.empty())
 787                         features.addPreambleSnippet(preamble);
 788         }
 789 }
 790
 791
 792 //
 793 // preview stuff
 794 //
 795
 796 namespace {
 797
 798 bool preview_wanted(InsetExternalParams const & params)
 799 {
 800         return params.display == external::PreviewDisplay &&
 801                 support::isFileReadable(params.filename);
 802 }
 803
 804
 805 docstring const latex_string(InsetExternal const & inset, Buffer const & buffer)
 806 {
 807         odocstringstream os;
 808         // We don't need to set runparams.encoding since it is not used by
 809         // latex().
 810         OutputParams runparams(0);
 811         runparams.flavor = OutputParams::LATEX;
 812         inset.latex(buffer, os, runparams);
 813         return os.str();
 814 }
 815
 816
 817 void add_preview_and_start_loading(RenderMonitoredPreview & renderer,
 818                                    InsetExternal const & inset,
 819                                    Buffer const & buffer)
 820 {
 821         InsetExternalParams const & params = inset.params();
 822
 823         if (RenderPreview::status() != LyXRC::PREVIEW_OFF &&
 824             preview_wanted(params)) {
 825                 renderer.setAbsFile(params.filename);
 826                 docstring const snippet = latex_string(inset, buffer);
 827                 renderer.addPreview(snippet, buffer);
 828                 renderer.startLoading(buffer);
 829         }
 830 }
 831
 832 } // namespace anon
 833
 834
 835 void InsetExternal::addPreview(graphics::PreviewLoader & ploader) const
 836 {
 837         RenderMonitoredPreview * const ptr = renderer_->asMonitoredPreview();
 838         if (!ptr)
 839                 return;
 840
 841         if (preview_wanted(params())) {
 842                 ptr->setAbsFile(params_.filename);
 843                 docstring const snippet = latex_string(*this, ploader.buffer());
 844                 ptr->addPreview(snippet, ploader);
 845         }
 846 }
 847
 848
 849 /// Mailer stuff
 850
 851 string const InsetExternalMailer::name_("external");
 852
 853 InsetExternalMailer::InsetExternalMailer(InsetExternal & inset)
 854         : inset_(inset)
 855 {}
 856
 857
 858 string const InsetExternalMailer::inset2string(Buffer const & buffer) const
 859 {
 860         return params2string(inset_.params(), buffer);
 861 }
 862
 863
 864 void InsetExternalMailer::string2params(string const & in,
 865                                         Buffer const & buffer,
 866                                         InsetExternalParams & params)
 867 {
 868         params = InsetExternalParams();
 869         if (in.empty())
 870                 return;
 871
 872         istringstream data(in);
 873         Lexer lex(0,0);
 874         lex.setStream(data);
 875
 876         string name;
 877         lex >> name;
 878         if (!lex || name != name_)
 879                 return print_mailer_error("InsetExternalMailer", in, 1, name_);
 880
 881         // This is part of the inset proper that is usually swallowed
 882         // by Text::readInset
 883         string id;
 884         lex >> id;
 885         if (!lex || id != "External")
 886                 return print_mailer_error("InsetBoxMailer", in, 2, "External");
 887
 888         params.read(buffer, lex);
 889 }
 890
 891
 892 string const
 893 InsetExternalMailer::params2string(InsetExternalParams const & params,
 894                                    Buffer const & buffer)
 895 {
 896         ostringstream data;
 897         data << name_ << ' ';
 898         params.write(buffer, data);
 899         data << "\\end_inset\n";
 900         return data.str();
 901 }
 902
 903 } // namespace lyx