2 * \file PreviewLoader.cpp
3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Angus Leeming
8 * Full author contact details are available in file CREDITS.
13 #include "PreviewLoader.h"
14 #include "PreviewImage.h"
15 #include "GraphicsCache.h"
18 #include "BufferParams.h"
19 #include "Converter.h"
22 #include "InsetIterator.h"
23 #include "LaTeXFeatures.h"
26 #include "OutputParams.h"
28 #include "texstream.h"
30 #include "frontends/Application.h" // hexName
32 #include "insets/Inset.h"
34 #include "support/convert.h"
35 #include "support/debug.h"
36 #include "support/FileName.h"
37 #include "support/filetools.h"
38 #include "support/ForkedCalls.h"
39 #include "support/lstrings.h"
41 #include "support/TempFile.h"
53 using namespace lyx::support;
59 typedef pair<string, FileName> SnippetPair;
61 // A list of all snippets to be converted to previews
62 typedef list<string> PendingSnippets;
64 // Each item in the vector is a pair<snippet, image file name>.
65 typedef vector<SnippetPair> BitmapFile;
68 FileName const unique_tex_filename(FileName const & bufferpath)
70 TempFile tempfile(bufferpath, "lyxpreviewXXXXXX.tex");
71 tempfile.setAutoRemove(false);
72 return tempfile.name();
76 void setAscentFractions(vector<double> & ascent_fractions,
77 FileName const & metrics_file)
79 // If all else fails, then the images will have equal ascents and
81 vector<double>::iterator it = ascent_fractions.begin();
82 vector<double>::iterator end = ascent_fractions.end();
85 ifstream in(metrics_file.toFilesystemEncoding().c_str());
87 LYXERR(lyx::Debug::GRAPHICS, "setAscentFractions(" << metrics_file << ")\n"
88 << "Unable to open file!");
94 int snippet_counter = 1;
95 while (!in.eof() && it != end) {
98 double ascent_fraction;
100 in >> snippet >> id >> ascent_fraction;
106 error = snippet != "Snippet";
110 error = id != snippet_counter;
114 *it = ascent_fraction;
121 LYXERR(lyx::Debug::GRAPHICS, "setAscentFractions(" << metrics_file << ")\n"
122 << "Error reading file!\n");
130 FindFirst(string const & comp) : comp_(comp) {}
131 bool operator()(SnippetPair const & sp) const { return sp.first == comp_; }
137 /// Store info on a currently executing, forked process.
141 InProgress() : pid(0) {}
143 InProgress(string const & filename_base,
144 PendingSnippets const & pending,
145 string const & to_format);
146 /// Remove any files left lying around and kill the forked process.
154 FileName metrics_file;
159 typedef map<pid_t, InProgress> InProgressProcesses;
161 typedef InProgressProcesses::value_type InProgressProcess;
169 class PreviewLoader::Impl {
172 Impl(PreviewLoader & p, Buffer const & b);
173 /// Stop any InProgress items still executing.
176 PreviewImage const * preview(string const & latex_snippet) const;
178 PreviewLoader::Status status(string const & latex_snippet) const;
180 void add(string const & latex_snippet);
182 void remove(string const & latex_snippet);
183 /// \p wait whether to wait for the process to complete or, instead,
184 /// to do it in the background.
185 void startLoading(bool wait = false);
187 void refreshPreviews();
189 /// Emit this signal when an image is ready for display.
190 signals2::signal<void(PreviewImage const &)> imageReady;
192 Buffer const & buffer() const { return buffer_; }
194 lyx::Converter const * setConverter(string const & from);
197 /// Called by the ForkedCall process that generated the bitmap files.
198 void finishedGenerating(pid_t, int);
200 void dumpPreamble(otexstream &, OutputParams::FLAVOR) const;
202 void dumpData(odocstream &, BitmapFile const &) const;
204 /** cache_ allows easy retrieval of already-generated images
205 * using the LaTeX snippet as the identifier.
207 typedef std::shared_ptr<PreviewImage> PreviewImagePtr;
209 typedef map<string, PreviewImagePtr> Cache;
213 /** pending_ stores the LaTeX snippets in anticipation of them being
214 * sent to the converter.
216 PendingSnippets pending_;
218 /** in_progress_ stores all forked processes so that we can proceed
221 InProgressProcesses in_progress_;
224 PreviewLoader & parent_;
226 Buffer const & buffer_;
228 mutable int font_scaling_factor_;
230 mutable int fg_color_;
232 mutable int bg_color_;
234 QTimer * delay_refresh_;
236 bool finished_generating_;
238 /// We don't own this
239 static lyx::Converter const * pconverter_;
241 Trackable trackable_;
245 lyx::Converter const * PreviewLoader::Impl::pconverter_;
249 // The public interface, defined in PreviewLoader.h
252 PreviewLoader::PreviewLoader(Buffer const & b)
253 : pimpl_(new Impl(*this, b))
257 PreviewLoader::~PreviewLoader()
263 PreviewImage const * PreviewLoader::preview(string const & latex_snippet) const
265 return pimpl_->preview(latex_snippet);
269 PreviewLoader::Status PreviewLoader::status(string const & latex_snippet) const
271 return pimpl_->status(latex_snippet);
275 void PreviewLoader::add(string const & latex_snippet) const
277 pimpl_->add(latex_snippet);
281 void PreviewLoader::remove(string const & latex_snippet) const
283 pimpl_->remove(latex_snippet);
287 void PreviewLoader::startLoading(bool wait) const
289 pimpl_->startLoading(wait);
293 void PreviewLoader::refreshPreviews()
295 pimpl_->refreshPreviews();
299 signals2::connection PreviewLoader::connect(slot const & slot) const
301 return pimpl_->imageReady.connect(slot);
305 void PreviewLoader::emitSignal(PreviewImage const & pimage) const
307 pimpl_->imageReady(pimage);
311 Buffer const & PreviewLoader::buffer() const
313 return pimpl_->buffer();
316 } // namespace graphics
320 // The details of the Impl
321 // =======================
325 class IncrementedFileName {
327 IncrementedFileName(string const & to_format,
328 string const & filename_base)
329 : to_format_(to_format), base_(filename_base), counter_(1)
332 SnippetPair const operator()(string const & snippet)
335 os << base_ << counter_++ << '.' << to_format_;
336 string const file = os.str();
338 return make_pair(snippet, FileName(file));
342 string const & to_format_;
343 string const & base_;
348 InProgress::InProgress(string const & filename_base,
349 PendingSnippets const & pending,
350 string const & to_format)
352 metrics_file(filename_base + ".metrics"),
353 snippets(pending.size())
355 PendingSnippets::const_iterator pit = pending.begin();
356 PendingSnippets::const_iterator pend = pending.end();
357 BitmapFile::iterator sit = snippets.begin();
359 transform(pit, pend, sit,
360 IncrementedFileName(to_format, filename_base));
364 void InProgress::stop() const
367 ForkedCallsController::kill(pid, 0);
369 if (!metrics_file.empty())
370 metrics_file.removeFile();
372 BitmapFile::const_iterator vit = snippets.begin();
373 BitmapFile::const_iterator vend = snippets.end();
374 for (; vit != vend; ++vit) {
375 if (!vit->second.empty())
376 vit->second.removeFile();
386 PreviewLoader::Impl::Impl(PreviewLoader & p, Buffer const & b)
387 : parent_(p), buffer_(b), finished_generating_(true)
389 font_scaling_factor_ = int(buffer_.fontScalingFactor());
391 fg_color_ = strtol(theApp()->hexName(foregroundColor()).c_str(), nullptr, 16);
392 bg_color_ = strtol(theApp()->hexName(backgroundColor()).c_str(), nullptr, 16);
395 bg_color_ = 0xffffff;
398 pconverter_ = setConverter("lyxpreview");
400 delay_refresh_ = new QTimer(&parent_);
401 delay_refresh_->setSingleShot(true);
402 QObject::connect(delay_refresh_, SIGNAL(timeout()),
403 &parent_, SLOT(refreshPreviews()));
407 lyx::Converter const * PreviewLoader::Impl::setConverter(string const & from)
409 typedef vector<string> FmtList;
410 FmtList const & loadableFormats = graphics::Cache::get().loadableFormats();
411 FmtList::const_iterator it = loadableFormats.begin();
412 FmtList::const_iterator const end = loadableFormats.end();
414 for (; it != end; ++it) {
415 string const to = *it;
419 lyx::Converter const * ptr = lyx::theConverters().getConverter(from, to);
424 // Show the error only once. This is thread-safe.
425 static nullptr_t no_conv = [&]{
426 LYXERR0("PreviewLoader::startLoading()\n"
427 << "No converter from \"" << from
428 << "\" format has been defined.");
436 PreviewLoader::Impl::~Impl()
438 delete delay_refresh_;
440 InProgressProcesses::iterator ipit = in_progress_.begin();
441 InProgressProcesses::iterator ipend = in_progress_.end();
443 for (; ipit != ipend; ++ipit)
449 PreviewLoader::Impl::preview(string const & latex_snippet) const
451 int fs = int(buffer_.fontScalingFactor());
455 fg = strtol(theApp()->hexName(foregroundColor()).c_str(), nullptr, 16);
456 bg = strtol(theApp()->hexName(backgroundColor()).c_str(), nullptr, 16);
458 if (font_scaling_factor_ != fs || fg_color_ != fg || bg_color_ != bg) {
459 // Schedule refresh of all previews on zoom or color changes.
460 // The previews are regenerated only after the zoom factor
461 // has not been changed for about 1 second.
464 delay_refresh_->start(1000);
466 // Don't try to access the cache until we are done.
467 if (delay_refresh_->isActive() || !finished_generating_)
469 Cache::const_iterator it = cache_.find(latex_snippet);
470 return (it == cache_.end()) ? nullptr : it->second.get();
474 void PreviewLoader::Impl::refreshPreviews()
476 font_scaling_factor_ = int(buffer_.fontScalingFactor());
477 // Reschedule refresh until the previous process completed.
478 if (!finished_generating_) {
479 delay_refresh_->start(1000);
482 Cache::const_iterator cit = cache_.begin();
483 Cache::const_iterator cend = cache_.end();
485 parent_.remove((cit++)->first);
486 finished_generating_ = false;
487 buffer_.updatePreviews();
493 std::function<bool (InProgressProcess const &)> FindSnippet(string const & s)
495 return [s](InProgressProcess const & process) {
496 BitmapFile const & snippets = process.second.snippets;
497 BitmapFile::const_iterator beg = snippets.begin();
498 BitmapFile::const_iterator end = snippets.end();
499 return find_if(beg, end, FindFirst(s)) != end;
505 PreviewLoader::Status
506 PreviewLoader::Impl::status(string const & latex_snippet) const
508 Cache::const_iterator cit = cache_.find(latex_snippet);
509 if (cit != cache_.end())
512 PendingSnippets::const_iterator pit = pending_.begin();
513 PendingSnippets::const_iterator pend = pending_.end();
515 pit = find(pit, pend, latex_snippet);
519 InProgressProcesses::const_iterator ipit = in_progress_.begin();
520 InProgressProcesses::const_iterator ipend = in_progress_.end();
522 ipit = find_if(ipit, ipend, FindSnippet(latex_snippet));
530 void PreviewLoader::Impl::add(string const & latex_snippet)
532 if (!pconverter_ || status(latex_snippet) != NotFound)
535 string const snippet = trim(latex_snippet);
539 LYXERR(Debug::GRAPHICS, "adding snippet:\n" << snippet);
541 pending_.push_back(snippet);
547 std::function<void (InProgressProcess &)> EraseSnippet(string const & s) {
548 return [s](InProgressProcess & process) {
549 BitmapFile & snippets = process.second.snippets;
550 BitmapFile::iterator it = snippets.begin();
551 BitmapFile::iterator end = snippets.end();
553 it = find_if(it, end, FindFirst(s));
555 snippets.erase(it, it+1);
562 void PreviewLoader::Impl::remove(string const & latex_snippet)
564 Cache::iterator cit = cache_.find(latex_snippet);
565 if (cit != cache_.end())
568 PendingSnippets::iterator pit = pending_.begin();
569 PendingSnippets::iterator pend = pending_.end();
571 pending_.erase(std::remove(pit, pend, latex_snippet), pend);
573 InProgressProcesses::iterator ipit = in_progress_.begin();
574 InProgressProcesses::iterator ipend = in_progress_.end();
576 for_each(ipit, ipend, EraseSnippet(latex_snippet));
578 while (ipit != ipend) {
579 InProgressProcesses::iterator curr = ipit++;
580 if (curr->second.snippets.empty())
581 in_progress_.erase(curr);
586 void PreviewLoader::Impl::startLoading(bool wait)
588 if (pending_.empty() || !pconverter_)
591 // Only start the process off after the buffer is loaded from file.
592 if (!buffer_.isFullyLoaded())
595 LYXERR(Debug::GRAPHICS, "PreviewLoader::startLoading()");
597 // As used by the LaTeX file and by the resulting image files
598 FileName const directory(buffer_.temppath());
600 FileName const latexfile = unique_tex_filename(directory);
601 string const filename_base = removeExtension(latexfile.absFileName());
603 // Create an InProgress instance to place in the map of all
604 // such processes if it starts correctly.
605 InProgress inprogress(filename_base, pending_, pconverter_->to());
607 // clear pending_, so we're ready to start afresh.
610 // Output the LaTeX file.
611 // we use the encoding of the buffer
612 Encoding const & enc = buffer_.params().encoding();
614 try { of.reset(enc.iconvName()); }
615 catch (iconv_codecvt_facet_exception const & e) {
616 LYXERR0("Caught iconv exception: " << e.what()
617 << "\nUnable to create LaTeX file: " << latexfile);
622 OutputParams runparams(&enc);
623 LaTeXFeatures features(buffer_, buffer_.params(), runparams);
625 if (!openFileWrite(of, latexfile))
629 LYXERR(Debug::GRAPHICS, "PreviewLoader::startLoading()\n"
630 << "Unable to create LaTeX file\n" << latexfile);
633 of << "\\batchmode\n";
635 // Set \jobname of previews to the document name (see bug 9627)
636 of << "\\def\\jobname{"
637 << from_utf8(changeExtension(buffer_.latexName(true), ""))
640 LYXERR(Debug::LATEX, "Format = " << buffer_.params().getDefaultOutputFormat());
641 string latexparam = "";
642 bool docformat = !buffer_.params().default_output_format.empty()
643 && buffer_.params().default_output_format != "default";
644 // Use LATEX flavor if the document does not specify a specific
645 // output format (see bug 9371).
646 OutputParams::FLAVOR flavor = docformat
647 ? buffer_.params().getOutputFlavor()
648 : OutputParams::LATEX;
649 if (buffer_.params().encoding().package() == Encoding::japanese) {
650 latexparam = " --latex=platex";
651 flavor = OutputParams::LATEX;
653 else if (buffer_.params().useNonTeXFonts) {
654 if (flavor == OutputParams::LUATEX)
655 latexparam = " --latex=lualatex";
657 flavor = OutputParams::XETEX;
658 latexparam = " --latex=xelatex";
663 case OutputParams::PDFLATEX:
664 latexparam = " --latex=pdflatex";
666 case OutputParams::XETEX:
667 latexparam = " --latex=xelatex";
669 case OutputParams::LUATEX:
670 latexparam = " --latex=lualatex";
672 case OutputParams::DVILUATEX:
673 latexparam = " --latex=dvilualatex";
676 flavor = OutputParams::LATEX;
679 dumpPreamble(os, flavor);
680 // handle inputenc etc.
681 // I think this is already handled by dumpPreamble(): Kornel
682 // buffer_.params().writeEncodingPreamble(os, features);
683 of << "\n\\begin{document}\n";
684 dumpData(of, inprogress.snippets);
685 of << "\n\\end{document}\n";
688 LYXERR(Debug::GRAPHICS, "PreviewLoader::startLoading()\n"
689 << "File was not closed properly.");
693 // The conversion command.
695 cs << pconverter_->command()
696 << " " << quoteName(latexfile.toFilesystemEncoding())
697 << " --dpi " << font_scaling_factor_;
700 // The colors should be customizable.
701 if (!buffer_.isExporting()) {
702 ColorCode const fg = PreviewLoader::foregroundColor();
703 ColorCode const bg = PreviewLoader::backgroundColor();
704 cs << " --fg " << theApp()->hexName(fg)
705 << " --bg " << theApp()->hexName(bg);
709 cs << " --bibtex=" << quoteName(buffer_.params().bibtexCommand());
710 if (buffer_.params().bufferFormat() == "lilypond-book")
713 string const command = cs.str();
716 ForkedCall call(buffer_.filePath(), buffer_.layoutPos());
717 int ret = call.startScript(ForkedProcess::Wait, command);
718 // PID_MAX_LIMIT is 2^22 so we start one after that
719 static atomic_int fake((1 << 22) + 1);
721 inprogress.pid = pid;
722 inprogress.command = command;
723 in_progress_[pid] = inprogress;
724 finishedGenerating(pid, ret);
728 // Initiate the conversion from LaTeX to bitmap images files.
729 ForkedCall::sigPtr convert_ptr = make_shared<ForkedCall::sig>();
730 convert_ptr->connect(ForkedProcess::slot([this](pid_t pid, int retval){
731 finishedGenerating(pid, retval);
732 }).track_foreign(trackable_.p()));
734 ForkedCall call(buffer_.filePath());
735 int ret = call.startScript(command, convert_ptr);
738 LYXERR(Debug::GRAPHICS, "PreviewLoader::startLoading()\n"
739 << "Unable to start process\n" << command);
743 // Store the generation process in a list of all such processes
744 inprogress.pid = call.pid();
745 inprogress.command = command;
746 in_progress_[inprogress.pid] = inprogress;
750 double PreviewLoader::displayPixelRatio() const
752 return buffer().params().display_pixel_ratio;
755 void PreviewLoader::Impl::finishedGenerating(pid_t pid, int retval)
758 InProgressProcesses::iterator git = in_progress_.find(pid);
759 if (git == in_progress_.end()) {
760 lyxerr << "PreviewLoader::finishedGenerating(): unable to find "
761 "data for PID " << pid << endl;
762 finished_generating_ = true;
766 string const command = git->second.command;
767 string const status = retval > 0 ? "failed" : "succeeded";
768 LYXERR(Debug::GRAPHICS, "PreviewLoader::finishedInProgress("
769 << retval << "): processing " << status
770 << " for " << command);
772 in_progress_.erase(git);
773 finished_generating_ = true;
777 // Read the metrics file, if it exists
778 vector<double> ascent_fractions(git->second.snippets.size());
779 setAscentFractions(ascent_fractions, git->second.metrics_file);
781 // Add these newly generated bitmap files to the cache and
782 // start loading them into LyX.
783 BitmapFile::const_iterator it = git->second.snippets.begin();
784 BitmapFile::const_iterator end = git->second.snippets.end();
786 list<PreviewImagePtr> newimages;
788 size_t metrics_counter = 0;
789 for (; it != end; ++it, ++metrics_counter) {
790 string const & snip = it->first;
791 FileName const & file = it->second;
792 double af = ascent_fractions[metrics_counter];
794 // Add the image to the cache only if it's actually present
795 // and not empty (an empty image is signaled by af < 0)
796 if (af >= 0 && file.isReadableFile()) {
797 PreviewImagePtr ptr(new PreviewImage(parent_, snip, file, af));
800 newimages.push_back(ptr);
805 // Remove the item from the list of still-executing processes.
806 in_progress_.erase(git);
808 // Tell the outside world
809 list<PreviewImagePtr>::const_reverse_iterator
810 nit = newimages.rbegin();
811 list<PreviewImagePtr>::const_reverse_iterator
812 nend = newimages.rend();
813 for (; nit != nend; ++nit) {
814 imageReady(*nit->get());
816 finished_generating_ = true;
820 void PreviewLoader::Impl::dumpPreamble(otexstream & os, OutputParams::FLAVOR flavor) const
822 // Dump the preamble only.
823 LYXERR(Debug::LATEX, "dumpPreamble, flavor == " << flavor);
824 OutputParams runparams(&buffer_.params().encoding());
825 runparams.flavor = flavor;
826 runparams.nice = true;
827 runparams.moving_arg = true;
828 runparams.free_spacing = true;
829 runparams.is_child = buffer_.parent();
830 buffer_.writeLaTeXSource(os, buffer_.filePath(), runparams, Buffer::OnlyPreamble);
832 // FIXME! This is a HACK! The proper fix is to control the 'true'
833 // passed to WriteStream below:
834 // int InsetMathNest::latex(Buffer const &, odocstream & os,
835 // OutputParams const & runparams) const
837 // WriteStream wi(os, runparams.moving_arg, true);
842 << "\\def\\lyxlock{}\n"
845 // All equation labels appear as "(#)" + preview.sty's rendering of
847 if (lyxrc.preview_hashed_labels)
848 os << "\\renewcommand{\\theequation}{\\#}\n";
850 // Use the preview style file to ensure that each snippet appears on a
852 // Also support PDF output (automatically generated e.g. when
853 // \usepackage[pdftex]{hyperref} is used and XeTeX.
855 << "\\usepackage[active,delayed,showlabels,lyx]{preview}\n"
860 void PreviewLoader::Impl::dumpData(odocstream & os,
861 BitmapFile const & vec) const
866 BitmapFile::const_iterator it = vec.begin();
867 BitmapFile::const_iterator end = vec.end();
869 for (; it != end; ++it) {
871 os << "\\begin{preview}\n"
872 << from_utf8(it->first)
873 << "\n\\end{preview}\n\n";
877 } // namespace graphics
880 #include "moc_PreviewLoader.cpp"