/* Copyright (C) 2005 J.F.Dockes * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the * Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "autoconfig.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "debuglog.h" #include "pathut.h" #include "internfile.h" #include "recoll.h" #include "plaintorich.h" #include "smallut.h" #include "wipedir.h" #include "cancelcheck.h" #include "preview_w.h" #include "guiutils.h" #include "docseqhist.h" #include "rclhelp.h" static const QKeySequence closeKS(Qt::Key_Escape); static const QKeySequence nextDocInTabKS(Qt::ShiftModifier+Qt::Key_Down); static const QKeySequence prevDocInTabKS(Qt::ShiftModifier+Qt::Key_Up); static const QKeySequence closeTabKS(Qt::ControlModifier+Qt::Key_W); static const QKeySequence printTabKS(Qt::ControlModifier+Qt::Key_P); // Subclass plainToRich to add s and anchors to the preview text class PlainToRichQtPreview : public PlainToRich { public: PlainToRichQtPreview() : m_curanchor(1), m_lastanchor(0) { } void clear() { m_curanchor = 1; m_lastanchor = 0; m_groupanchors.clear(); m_groupcuranchors.clear(); } bool haveAnchors() { return m_lastanchor != 0; } virtual string header() { if (!m_inputhtml) { switch (prefs.previewPlainPre) { case PrefsPack::PP_BR: m_eolbr = true; return ""; case PrefsPack::PP_PRE: m_eolbr = false; return "
";
            case PrefsPack::PP_PREWRAP:
                m_eolbr = false;
                return ""
                    "";
            }
        }
        return cstr_null;
    }

    virtual string startMatch(unsigned int grpidx) {
        LOGDEB2(("startMatch, grpidx %u\n", grpidx));
        grpidx = m_hdata->grpsugidx[grpidx];
        LOGDEB2(("startMatch, ugrpidx %u\n", grpidx));
        m_groupanchors[grpidx].push_back(++m_lastanchor);
        m_groupcuranchors[grpidx] = 0; 
        return string("").
            append("");
    }

    virtual string endMatch() {
        return string("");
    }

    virtual string termAnchorName(int i) const {
        static const char *termAnchorNameBase = "TRM";
        char acname[sizeof(termAnchorNameBase) + 20];
        sprintf(acname, "%s%d", termAnchorNameBase, i);
        return string(acname);
    }

    virtual string startChunk() { 
        return "";
    }

    int nextAnchorNum(int grpidx) {
        LOGDEB2(("nextAnchorNum: group %d\n", grpidx));
        map::iterator curit = 
            m_groupcuranchors.find(grpidx);
        map >::iterator vecit = 
            m_groupanchors.find(grpidx);
        if (grpidx == -1 || curit == m_groupcuranchors.end() ||
            vecit == m_groupanchors.end()) {
            if (m_curanchor >= m_lastanchor)
                m_curanchor = 1;
            else
                m_curanchor++;
        } else {
            if (curit->second >= vecit->second.size() -1)
                m_groupcuranchors[grpidx] = 0;
            else 
                m_groupcuranchors[grpidx]++;
            m_curanchor = vecit->second[m_groupcuranchors[grpidx]];
            LOGDEB2(("nextAnchorNum: curanchor now %d\n", m_curanchor));
        }
        return m_curanchor;
    }

    int prevAnchorNum(int grpidx) {
        map::iterator curit = 
            m_groupcuranchors.find(grpidx);
        map >::iterator vecit = 
            m_groupanchors.find(grpidx);
        if (grpidx == -1 || curit == m_groupcuranchors.end() ||
            vecit == m_groupanchors.end()) {
            if (m_curanchor <= 1)
                m_curanchor = m_lastanchor;
            else
                m_curanchor--;
        } else {
            if (curit->second <= 0)
                m_groupcuranchors[grpidx] = vecit->second.size() -1;
            else 
                m_groupcuranchors[grpidx]--;
            m_curanchor = vecit->second[m_groupcuranchors[grpidx]];
        }
        return m_curanchor;
    }

    QString curAnchorName() const {
        return QString::fromUtf8(termAnchorName(m_curanchor).c_str());
    }

private:
    int m_curanchor;
    int m_lastanchor;
    // Lists of anchor numbers (match locations) for the term (groups)
    // in the query (the map key is and index into HighlightData.groups).
    map > m_groupanchors;
    map m_groupcuranchors;
};

void Preview::init()
{
    setObjectName("Preview");
    QVBoxLayout* previewLayout = new QVBoxLayout(this);

    pvTab = new QTabWidget(this);

    // Create the first tab. Should be possible to use addEditorTab
    // but this causes a pb with the sizeing
    QWidget *unnamed = new QWidget(pvTab);
    QVBoxLayout *unnamedLayout = new QVBoxLayout(unnamed);
    PreviewTextEdit *pvEdit = new PreviewTextEdit(unnamed, "pvEdit", this);
    pvEdit->setReadOnly(true);
    pvEdit->setUndoRedoEnabled(false);
    unnamedLayout->addWidget(pvEdit);
    pvTab->addTab(unnamed, "");

    previewLayout->addWidget(pvTab);

    // Create the buttons and entry field
    QHBoxLayout *layout3 = new QHBoxLayout(0); 
    searchLabel = new QLabel(this);
    layout3->addWidget(searchLabel);

    searchTextCMB = new QComboBox(this);
    searchTextCMB->setEditable(true);
    searchTextCMB->setInsertPolicy(QComboBox::NoInsert);
    searchTextCMB->setDuplicatesEnabled(false);
    for (unsigned int i = 0; i < m_hData.ugroups.size(); i++) {
        QString s;
        for (unsigned int j = 0; j < m_hData.ugroups[i].size(); j++) {
            s.append(QString::fromUtf8(m_hData.ugroups[i][j].c_str()));
            if (j != m_hData.ugroups[i].size()-1)
                s.append(" ");
        }
        searchTextCMB->addItem(s);
    }
    searchTextCMB->setEditText("");
    searchTextCMB->setCompleter(0);

    layout3->addWidget(searchTextCMB);

    nextButton = new QPushButton(this);
    nextButton->setEnabled(true);
    layout3->addWidget(nextButton);
    prevButton = new QPushButton(this);
    prevButton->setEnabled(true);
    layout3->addWidget(prevButton);
    clearPB = new QPushButton(this);
    clearPB->setEnabled(false);
    layout3->addWidget(clearPB);
    matchCheck = new QCheckBox(this);
    layout3->addWidget(matchCheck);

    previewLayout->addLayout(layout3);

    resize(QSize(640, 480).expandedTo(minimumSizeHint()));

    // buddies
    searchLabel->setBuddy(searchTextCMB);

    searchLabel->setText(tr("&Search for:"));
    nextButton->setText(tr("&Next"));
    prevButton->setText(tr("&Previous"));
    clearPB->setText(tr("Clear"));
    matchCheck->setText(tr("Match &Case"));

    QPushButton * bt = new QPushButton(tr("Close Tab"), this);
    pvTab->setCornerWidget(bt);

    (void)new HelpClient(this);
    HelpClient::installMap((const char *)objectName().toUtf8(), 
                           "RCL.SEARCH.PREVIEW");

    // signals and slots connections
    connect(searchTextCMB, SIGNAL(activated(int)), 
            this, SLOT(searchTextFromIndex(int)));
    connect(searchTextCMB, SIGNAL(editTextChanged(const QString&)), 
            this, SLOT(searchTextChanged(const QString&)));
    connect(nextButton, SIGNAL(clicked()), this, SLOT(nextPressed()));
    connect(prevButton, SIGNAL(clicked()), this, SLOT(prevPressed()));
    connect(clearPB, SIGNAL(clicked()), searchTextCMB, SLOT(clearEditText()));
    connect(pvTab, SIGNAL(currentChanged(int)), 
            this, SLOT(currentChanged(int)));
    connect(bt, SIGNAL(clicked()), this, SLOT(closeCurrentTab()));

    connect(new QShortcut(closeKS, this), SIGNAL (activated()), 
            this, SLOT (close()));
    connect(new QShortcut(nextDocInTabKS, this), SIGNAL (activated()), 
            this, SLOT (emitShowNext()));
    connect(new QShortcut(prevDocInTabKS, this), SIGNAL (activated()), 
            this, SLOT (emitShowPrev()));
    connect(new QShortcut(closeTabKS, this), SIGNAL (activated()), 
            this, SLOT (closeCurrentTab()));
    connect(new QShortcut(printTabKS, this), SIGNAL (activated()), 
            this, SIGNAL (printCurrentPreviewRequest()));

    m_dynSearchActive = false;
    m_canBeep = true;
    if (prefs.pvwidth > 100) {
        resize(prefs.pvwidth, prefs.pvheight);
    }
    m_loading = false;
    currentChanged(pvTab->currentIndex());
    m_justCreated = true;
}

void Preview::emitShowNext()
{
    if (m_loading)
        return;
    PreviewTextEdit *edit = currentEditor();
    if (edit) {
        emit(showNext(this, m_searchId, edit->m_docnum));
    }
}

void Preview::emitShowPrev()
{
    if (m_loading)
        return;
    PreviewTextEdit *edit = currentEditor();
    if (edit) {
        emit(showPrev(this, m_searchId, edit->m_docnum));
    }
}

void Preview::closeEvent(QCloseEvent *e)
{
    LOGDEB(("Preview::closeEvent. m_loading %d\n", m_loading));
    if (m_loading) {
        CancelCheck::instance().setCancel();
        e->ignore();
        return;
    }
    prefs.pvwidth = width();
    prefs.pvheight = height();

    /* Release all temporary files (but maybe none is actually set) */
    for (int i = 0; i < pvTab->count(); i++) {
        QWidget *tw = pvTab->widget(i);
        if (tw) {
            PreviewTextEdit *edit = 
                tw->findChild("pvEdit");
            if (edit) {
                forgetTempFile(edit->m_tmpfilename);
            }
        }
    }
    emit previewExposed(this, m_searchId, -1);
    emit previewClosed(this);
    QWidget::closeEvent(e);
}

extern const char *eventTypeToStr(int tp);

bool Preview::eventFilter(QObject *target, QEvent *event)
{
    if (event->type() != QEvent::KeyPress) {
#if 0
        LOGDEB(("Preview::eventFilter(): %s\n", eventTypeToStr(event->type())));
        if (event->type() == QEvent::MouseButtonRelease) {
            QMouseEvent *mev = (QMouseEvent *)event;
            LOGDEB(("Mouse: GlobalY %d y %d\n", mev->globalY(),
                    mev->y()));
        }
#endif
        return false;
    }

    PreviewTextEdit *edit = currentEditor();
    QKeyEvent *keyEvent = (QKeyEvent *)event;

    if (m_dynSearchActive) {
        if (keyEvent->key() == Qt::Key_F3) {
            LOGDEB2(("Preview::eventFilter: got F3\n"));
            doSearch(searchTextCMB->currentText(), true, 
                     (keyEvent->modifiers() & Qt::ShiftModifier) != 0);
            return true;
        }
        if (target != searchTextCMB)
            return QApplication::sendEvent(searchTextCMB, event);
    } else {
        if (edit && 
            (target == edit || target == edit->viewport())) {
            if (keyEvent->key() == Qt::Key_Slash ||
                (keyEvent->key() == Qt::Key_F &&
                 (keyEvent->modifiers() & Qt::ControlModifier))) {
                LOGDEB2(("Preview::eventFilter: got / or C-F\n"));
                searchTextCMB->setFocus();
                m_dynSearchActive = true;
                return true;
            } else if (keyEvent->key() == Qt::Key_Space) {
                LOGDEB2(("Preview::eventFilter: got Space\n"));
                int value = edit->verticalScrollBar()->value();
                value += edit->verticalScrollBar()->pageStep();
                edit->verticalScrollBar()->setValue(value);
                return true;
            } else if (keyEvent->key() == Qt::Key_Backspace) {
                LOGDEB2(("Preview::eventFilter: got Backspace\n"));
                int value = edit->verticalScrollBar()->value();
                value -= edit->verticalScrollBar()->pageStep();
                edit->verticalScrollBar()->setValue(value);
                return true;
            }
        }
    }

    return false;
}

void Preview::searchTextChanged(const QString & text)
{
    LOGDEB1(("Search line text changed. text: '%s'\n", 
             (const char *)text.toUtf8()));
    m_searchTextFromIndex = -1;
    if (text.isEmpty()) {
        m_dynSearchActive = false;
        clearPB->setEnabled(false);
    } else {
        m_dynSearchActive = true;
        clearPB->setEnabled(true);
        doSearch(text, false, false);
    }
}

void Preview::searchTextFromIndex(int idx)
{
    LOGDEB1(("search line from index %d\n", idx));
    m_searchTextFromIndex = idx;
}

PreviewTextEdit *Preview::currentEditor()
{
    LOGDEB2(("Preview::currentEditor()\n"));
    QWidget *tw = pvTab->currentWidget();
    PreviewTextEdit *edit = 0;
    if (tw) {
        edit = tw->findChild("pvEdit");
    }
    return edit;
}

// Save current document to file
void Preview::emitSaveDocToFile()
{
    PreviewTextEdit *ce = currentEditor();
    if (ce && !ce->m_dbdoc.url.empty()) {
        emit saveDocToFile(ce->m_dbdoc);
    }
}

// Perform text search. If next is true, we look for the next match of the
// current search, trying to advance and possibly wrapping around. If next is
// false, the search string has been modified, we search for the new string, 
// starting from the current position
void Preview::doSearch(const QString &_text, bool next, bool reverse, 
                       bool wordOnly)
{
    LOGDEB(("Preview::doSearch: text [%s] idx %d next %d rev %d word %d\n", 
            (const char *)_text.toUtf8(), m_searchTextFromIndex, int(next), 
            int(reverse), int(wordOnly)));
    QString text = _text;

    bool matchCase = matchCheck->isChecked();
    PreviewTextEdit *edit = currentEditor();
    if (edit == 0) {
        // ??
        return;
    }

    if (text.isEmpty() || m_searchTextFromIndex != -1) {
        if (!edit->m_plaintorich->haveAnchors()) {
            LOGDEB(("NO ANCHORS\n"));
            return;
        }
        // The combobox indices are equal to the search ugroup indices
        // in hldata, that's how we built the list.
        if (reverse) {
            edit->m_plaintorich->prevAnchorNum(m_searchTextFromIndex);
        } else {
            edit->m_plaintorich->nextAnchorNum(m_searchTextFromIndex);
        }
        QString aname = edit->m_plaintorich->curAnchorName();
        LOGDEB(("Calling scrollToAnchor(%s)\n", (const char *)aname.toUtf8()));
        edit->scrollToAnchor(aname);
        // Position the cursor approximately at the anchor (top of
        // viewport) so that searches start from here
        QTextCursor cursor = edit->cursorForPosition(QPoint(0, 0));
        edit->setTextCursor(cursor);
        return;
    }

    // If next is false, the user added characters to the current
    // search string.  We need to reset the cursor position to the
    // start of the previous match, else incremental search is going
    // to look for the next occurrence instead of trying to lenghten
    // the current match
    if (!next) {
        QTextCursor cursor = edit->textCursor();
        cursor.setPosition(cursor.anchor(), QTextCursor::KeepAnchor);
        edit->setTextCursor(cursor);
    }
    Chrono chron;
    LOGDEB(("Preview::doSearch: first find call\n"));
    QTextDocument::FindFlags flags = 0;
    if (reverse)
        flags |= QTextDocument::FindBackward;
    if (wordOnly)
        flags |= QTextDocument::FindWholeWords;
    if (matchCase)
        flags |= QTextDocument::FindCaseSensitively;
    bool found = edit->find(text, flags);
    LOGDEB(("Preview::doSearch: first find call return: found %d %.2f S\n", 
            found, chron.secs()));
    // If not found, try to wrap around. 
    if (!found) { 
        LOGDEB(("Preview::doSearch: wrapping around\n"));
        if (reverse) {
            edit->moveCursor (QTextCursor::End);
        } else {
            edit->moveCursor (QTextCursor::Start);
        }
        LOGDEB(("Preview::doSearch: 2nd find call\n"));
        chron.restart();
        found = edit->find(text, flags);
        LOGDEB(("Preview::doSearch: 2nd find call return found %d %.2f S\n",
                found, chron.secs()));
    }

    if (found) {
        m_canBeep = true;
    } else {
        if (m_canBeep)
            QApplication::beep();
        m_canBeep = false;
    }
    LOGDEB(("Preview::doSearch: return\n"));
}

void Preview::nextPressed()
{
    LOGDEB2(("Preview::nextPressed\n"));
    doSearch(searchTextCMB->currentText(), true, false);
}

void Preview::prevPressed()
{
    LOGDEB2(("Preview::prevPressed\n"));
    doSearch(searchTextCMB->currentText(), true, true);
}

// Called when user clicks on tab
void Preview::currentChanged(int index)
{
    LOGDEB2(("PreviewTextEdit::currentChanged\n"));
    QWidget *tw = pvTab->widget(index);
    PreviewTextEdit *edit = 
        tw->findChild("pvEdit");
    LOGDEB1(("Preview::currentChanged(). Editor: %p\n", edit));
    
    if (edit == 0) {
        LOGERR(("Editor child not found\n"));
        return;
    }
    edit->setFocus();
    // Disconnect the print signal and reconnect it to the current editor
    LOGDEB(("Disconnecting reconnecting print signal\n"));
    disconnect(this, SIGNAL(printCurrentPreviewRequest()), 0, 0);
    connect(this, SIGNAL(printCurrentPreviewRequest()), edit, SLOT(print()));
    edit->installEventFilter(this);
    edit->viewport()->installEventFilter(this);
    searchTextCMB->installEventFilter(this);
    emit(previewExposed(this, m_searchId, edit->m_docnum));
}

void Preview::closeCurrentTab()
{
    LOGDEB1(("Preview::closeCurrentTab: m_loading %d\n", m_loading));
    if (m_loading) {
        CancelCheck::instance().setCancel();
        return;
    }
    PreviewTextEdit *e = currentEditor();
    if (e)
        forgetTempFile(e->m_tmpfilename);
    if (pvTab->count() > 1) {
        pvTab->removeTab(pvTab->currentIndex());
    } else {
        close();
    }
}

PreviewTextEdit *Preview::addEditorTab()
{
    LOGDEB1(("PreviewTextEdit::addEditorTab()\n"));
    QWidget *anon = new QWidget((QWidget *)pvTab);
    QVBoxLayout *anonLayout = new QVBoxLayout(anon); 
    PreviewTextEdit *editor = new PreviewTextEdit(anon, "pvEdit", this);
    editor->setReadOnly(true);
    editor->setUndoRedoEnabled(false );
    anonLayout->addWidget(editor);
    pvTab->addTab(anon, "Tab");
    pvTab->setCurrentIndex(pvTab->count() -1);
    return editor;
}

void Preview::setCurTabProps(const Rcl::Doc &doc, int docnum)
{
    LOGDEB1(("Preview::setCurTabProps\n"));
    QString title;
    string ctitle;
    if (doc.getmeta(Rcl::Doc::keytt, &ctitle) && !ctitle.empty()) {
        title = QString::fromUtf8(ctitle.c_str(), ctitle.length());
    } else {
        title = QString::fromLocal8Bit(path_getsimple(doc.url).c_str());
    }
    if (title.length() > 20) {
        title = title.left(10) + "..." + title.right(10);
    }
    int curidx = pvTab->currentIndex();
    pvTab->setTabText(curidx, title);

    char datebuf[100];
    datebuf[0] = 0;
    if (!doc.fmtime.empty() || !doc.dmtime.empty()) {
        time_t mtime = doc.dmtime.empty() ? 
            atoll(doc.fmtime.c_str()) : atoll(doc.dmtime.c_str());
        struct tm *tm = localtime(&mtime);
        strftime(datebuf, 99, "%Y-%m-%d %H:%M:%S", tm);
    }
    LOGDEB(("Doc.url: [%s]\n", doc.url.c_str()));
    string url;
    printableUrl(theconfig->getDefCharset(), doc.url, url);
    string tiptxt = url + string("\n");
    tiptxt += doc.mimetype + " " + string(datebuf) + "\n";
    if (!ctitle.empty())
        tiptxt += ctitle + "\n";
    pvTab->setTabToolTip(curidx,
                         QString::fromUtf8(tiptxt.c_str(), tiptxt.length()));

    PreviewTextEdit *e = currentEditor();
    if (e) {
        e->m_url = doc.url;
        e->m_ipath = doc.ipath;
        e->m_docnum = docnum;
    }
}

bool Preview::makeDocCurrent(const Rcl::Doc& doc, int docnum, bool sametab)
{
    LOGDEB(("Preview::makeDocCurrent: %s\n", doc.url.c_str()));

    if (m_loading) {
        LOGERR(("Already loading\n"));
        return false;
    }

    /* Check if we already have this page */
    for (int i = 0; i < pvTab->count(); i++) {
        QWidget *tw = pvTab->widget(i);
        if (tw) {
            PreviewTextEdit *edit = 
                tw->findChild("pvEdit");
            if (edit && !edit->m_url.compare(doc.url) && 
                !edit->m_ipath.compare(doc.ipath)) {
                pvTab->setCurrentIndex(i);
                return true;
            }
        }
    }

    // if just created the first tab was created during init
    if (!sametab && !m_justCreated && !addEditorTab()) {
        return false;
    }
    m_justCreated = false;
    if (!loadDocInCurrentTab(doc, docnum)) {
        closeCurrentTab();
        return false;
    }
    raise();
    return true;
}
void Preview::togglePlainPre()
{
    switch (prefs.previewPlainPre) {
    case PrefsPack::PP_BR:
        prefs.previewPlainPre = PrefsPack::PP_PRE;
        break;
    case PrefsPack::PP_PRE:
        prefs.previewPlainPre = PrefsPack::PP_BR;
        break;
    case PrefsPack::PP_PREWRAP:
    default:
        prefs.previewPlainPre = PrefsPack::PP_PRE;
        break;
    }
    
    PreviewTextEdit *editor = currentEditor();
    if (editor)
        loadDocInCurrentTab(editor->m_dbdoc, editor->m_docnum);
}

void Preview::emitWordSelect(QString word)
{
    emit(wordSelect(word));
}

/*
  Code for loading a file into an editor window. The operations that
  we call have no provision to indicate progression, and it would be
  complicated or impossible to modify them to do so (Ie: for external 
  format converters).

  We implement a complicated and ugly mechanism based on threads to indicate 
  to the user that the app is doing things: lengthy operations are done in 
  threads and we update a progress indicator while they proceed (but we have 
  no estimate of their total duration).
  
  It might be possible, but complicated (need modifications in
  handler) to implement a kind of bucket brigade, to have the
  beginning of the text displayed faster
*/

/* A thread to to the file reading / format conversion */
class LoadThread : public QThread {
    int *statusp;
    Rcl::Doc& out;
    const Rcl::Doc& idoc;
    int loglevel;
public: 
    string missing;
    TempFile imgtmp;

    LoadThread(int *stp, Rcl::Doc& odoc, const Rcl::Doc& idc) 
        : statusp(stp), out(odoc), idoc(idc)
        {
            loglevel = DebugLog::getdbl()->getlevel();
        }
    ~LoadThread() {
    }
    virtual void run() {
        DebugLog::getdbl()->setloglevel(loglevel);
        FileInterner interner(idoc, theconfig, FileInterner::FIF_forPreview);
        FIMissingStore mst;
        interner.setMissingStore(&mst);
        // Even when previewHtml is set, we don't set the interner's
        // target mtype to html because we do want the html filter to
        // do its work: we won't use the text/plain, but we want the
        // text/html to be converted to utf-8 (for highlight processing)
        try {
            string ipath = idoc.ipath;
            FileInterner::Status ret = interner.internfile(out, ipath);
            if (ret == FileInterner::FIDone || ret == FileInterner::FIAgain) {
                // FIAgain is actually not nice here. It means that the record
                // for the *file* of a multidoc was selected. Actually this
                // shouldn't have had a preview link at all, but we don't know
                // how to handle it now. Better to show the first doc than
                // a mysterious error. Happens when the file name matches a
                // a search term.
                *statusp = 0;
                // If we prefer html and it is available, replace the
                // text/plain document text
                if (prefs.previewHtml && !interner.get_html().empty()) {
                    out.text = interner.get_html();
                    out.mimetype = "text/html";
                }
                imgtmp = interner.get_imgtmp();
            } else {
                out.mimetype = interner.getMimetype();
                mst.getMissingExternal(missing);
                *statusp = -1;
            }
        } catch (CancelExcept) {
            *statusp = -1;
        }
    }
};


// Insert into editor by chunks so that the top becomes visible
// earlier for big texts. This provokes some artifacts (adds empty line),
// so we can't set it too low.
#define CHUNKL 500*1000

/* A thread to convert to rich text (mark search terms) */
class ToRichThread : public QThread {
    string ∈
    const HighlightData &hdata;
    list &out;
    int loglevel;
    PlainToRichQtPreview *ptr;
public:
    ToRichThread(string &i, const HighlightData& hd, list &o, 
                 PlainToRichQtPreview *_ptr)
        : in(i), hdata(hd), out(o), ptr(_ptr)
        {
            loglevel = DebugLog::getdbl()->getlevel();
        }
    virtual void run()
        {
            DebugLog::getdbl()->setloglevel(loglevel);
            try {
                ptr->plaintorich(in, out, hdata, CHUNKL);
            } catch (CancelExcept) {
            }
        }
};

class LoadGuard {
    bool *m_bp;
public:
    LoadGuard(bool *bp) {m_bp = bp ; *m_bp = true;}
    ~LoadGuard() {*m_bp = false; CancelCheck::instance().setCancel(false);}
};

bool Preview::loadDocInCurrentTab(const Rcl::Doc &idoc, int docnum)
{
    LOGDEB1(("Preview::loadDocInCurrentTab()\n"));

    LoadGuard guard(&m_loading);
    CancelCheck::instance().setCancel(false);

    setCurTabProps(idoc, docnum);

    QString msg = QString("Loading: %1 (size %2 bytes)")
        .arg(QString::fromLocal8Bit(idoc.url.c_str()))
        .arg(QString::fromUtf8(idoc.fbytes.c_str()));

    QProgressDialog progress(msg, tr("Cancel"), 0, 0, this);
    progress.setMinimumDuration(2000);
    QEventLoop loop;
    QTimer tT;
    tT.setSingleShot(true);
    connect(&tT, SIGNAL(timeout()), &loop, SLOT(quit()));

    ////////////////////////////////////////////////////////////////////////
    // Load and convert document
    // idoc came out of the index data (main text and some fields missing). 
    // fdoc is the complete one what we are going to extract from storage.
    Rcl::Doc fdoc;
    int status = 1;
    LoadThread lthr(&status, fdoc, idoc);
    connect(<hr, SIGNAL(finished()), &loop, SLOT(quit()));

    lthr.start();
    for (int i = 0;;i++) {
        tT.start(1000); 
        loop.exec();
        if (lthr.isFinished())
            break;
        if (progress.wasCanceled()) {
            CancelCheck::instance().setCancel();
        }
        if (i == 2)
            progress.show();
    }

    LOGDEB(("loadDocInCurrentTab: after file load: cancel %d status %d"
            " text length %d\n", 
            CancelCheck::instance().cancelState(), status, fdoc.text.length()));

    if (CancelCheck::instance().cancelState())
        return false;
    if (status != 0) {
        progress.close();
        QString explain;
        if (!lthr.missing.empty()) {
            explain = QString::fromUtf8("
") +
                tr("Missing helper program: ") +
                QString::fromLocal8Bit(lthr.missing.c_str());
            QMessageBox::warning(0, "Recoll",
                                 tr("Can't turn doc into internal "
                                    "representation for ") +
                                 fdoc.mimetype.c_str() + explain);
        } else {
            QMessageBox::warning(0, "Recoll", 
                                 tr("Error while loading file"));
        }

        return false;
    }
    // Reset config just in case.
    theconfig->setKeyDir("");

    ////////////////////////////////////////////////////////////////////////
    // Create preview text: highlight search terms
    // We don't do the highlighting for very big texts: too long. We
    // should at least do special char escaping, in case a '&' or '<'
    // somehow slipped through previous processing.
    bool highlightTerms = fdoc.text.length() < 
        (unsigned long)prefs.maxhltextmbs * 1024 * 1024;

    // Final text is produced in chunks so that we can display the top
    // while still inserting at bottom
    list qrichlst;
    PreviewTextEdit *editor = currentEditor();

    editor->m_plaintorich->clear();

    // For an actual html file, if we want to have the images and
    // style loaded in the preview, we need to set the search
    // path. Not too sure this is a good idea as I find them rather
    // distracting when looking for text, esp. with qtextedit
    // relatively limited html support (text sometimes get hidden by
    // images).
#if 0
    string path = fileurltolocalpath(idoc.url);
    if (!path.empty()) {
        path = path_getfather(path);
        QStringList paths(QString::fromLocal8Bit(path.c_str()));
        editor->setSearchPaths(paths);
    }
#endif

    editor->setHtml("");
    editor->m_format = Qt::RichText;
    bool inputishtml = !fdoc.mimetype.compare("text/html");

#if 0
    // For testing qtextedit bugs...
    highlightTerms = true;
    const char *textlist[] =
        {
            "Du plain text avec un\n termtag fin de ligne:",
            "texte apres le tag\n",
        };
    const int listl = sizeof(textlist) / sizeof(char*);
    for (int i = 0 ; i < listl ; i++)
        qrichlst.push_back(QString::fromUtf8(textlist[i]));
#else
    if (highlightTerms) {
        progress.setLabelText(tr("Creating preview text"));
        qApp->processEvents();

        if (inputishtml) {
            LOGDEB1(("Preview: got html %s\n", fdoc.text.c_str()));
            editor->m_plaintorich->set_inputhtml(true);
        } else {
            LOGDEB1(("Preview: got plain %s\n", fdoc.text.c_str()));
            editor->m_plaintorich->set_inputhtml(false);
        }
        list richlst;
        ToRichThread rthr(fdoc.text, m_hData, richlst, editor->m_plaintorich);
        connect(&rthr, SIGNAL(finished()), &loop, SLOT(quit()));
        rthr.start();

        for (;;) {
            tT.start(1000); 
            loop.exec();
            if (rthr.isFinished())
                break;
            if (progress.wasCanceled()) {
                CancelCheck::instance().setCancel();
            }
        }

        // Conversion to rich text done
        if (CancelCheck::instance().cancelState()) {
            if (richlst.size() == 0 || richlst.front().length() == 0) {
                // We can't call closeCurrentTab here as it might delete
                // the object which would be a nasty surprise to our
                // caller.
                return false;
            } else {
                richlst.back() += "Cancelled !";
            }
        }
        // Convert C++ string list to QString list
        for (list::iterator it = richlst.begin(); 
             it != richlst.end(); it++) {
            qrichlst.push_back(QString::fromUtf8(it->c_str(), it->length()));
        }
    } else {
        LOGDEB(("Preview: no hilighting\n"));
        // No plaintorich() call.  In this case, either the text is
        // html and the html quoting is hopefully correct, or it's
        // plain-text and there is no need to escape special
        // characters. We'd still want to split in chunks (so that the
        // top is displayed faster), but we must not cut tags, and
        // it's too difficult on html. For text we do the splitting on
        // a QString to avoid utf8 issues.
        QString qr = QString::fromUtf8(fdoc.text.c_str(), fdoc.text.length());
        int l = 0;
        if (inputishtml) {
            qrichlst.push_back(qr);
        } else {
            editor->setPlainText("");
            editor->m_format = Qt::PlainText;
            for (int pos = 0; pos < (int)qr.length(); pos += l) {
                l = MIN(CHUNKL, qr.length() - pos);
                qrichlst.push_back(qr.mid(pos, l));
            }
        }
    }
#endif


    ///////////////////////////////////////////////////////////
    // Load text into editor window.
    progress.setLabelText(tr("Loading preview text into editor"));
    qApp->processEvents();
    for (list::iterator it = qrichlst.begin(); 
         it != qrichlst.end(); it++) {
        qApp->processEvents();

        editor->append(*it);
        // We need to save the rich text for printing, the editor does
        // not do it consistently for us.
        editor->m_richtxt.append(*it);

        if (progress.wasCanceled()) {
            editor->append("Cancelled !");
            LOGDEB(("loadDocInCurrentTab: cancelled in editor load\n"));
            break;
        }
    }

    progress.close();
    editor->m_curdsp = PreviewTextEdit::PTE_DSPTXT;

    ////////////////////////////////////////////////////////////////////////
    // Finishing steps

    // Maybe the text was actually empty ? Switch to fields then. Else free-up 
    // the text memory in the loaded document. We still have a copy of the text
    // in editor->m_richtxt
    bool textempty = fdoc.text.empty();
    if (!textempty)
        fdoc.text.clear(); 
    editor->m_fdoc = fdoc;
    editor->m_dbdoc = idoc;
    if (textempty)
        editor->displayFields();

    // If this is an image, display it instead of the text.
    if (!idoc.mimetype.compare(0, 6, "image/")) {
        string fn = fileurltolocalpath(idoc.url);

        // If the command wants a file but this is not a file url, or
        // there is an ipath that it won't understand, we need a temp file:
        theconfig->setKeyDir(path_getfather(fn));
        if (fn.empty() || !idoc.ipath.empty()) {
            TempFile temp = lthr.imgtmp;
            if (temp) {
                LOGDEB1(("Preview: load: got temp file from internfile\n"));
            } else if (!FileInterner::idocToFile(temp, string(), 
                                                 theconfig, idoc)) {
                temp.reset(); // just in case.
            }
            if (temp) {
                rememberTempFile(temp);
                fn = temp->filename();
                editor->m_tmpfilename = fn;
            } else {
                editor->m_tmpfilename.erase();
                fn.erase();
            }
        }

        if (!fn.empty()) {
            editor->m_image = QImage(fn.c_str());
            if (!editor->m_image.isNull())
                editor->displayImage();
        }
    }


    // Position the editor so that the first search term is visible
    if (searchTextCMB->currentText().length() != 0) {
        // If there is a current search string, perform the search
        m_canBeep = true;
        doSearch(searchTextCMB->currentText(), true, false);
    } else {
        // Position to the first query term
        if (editor->m_plaintorich->haveAnchors()) {
            QString aname = editor->m_plaintorich->curAnchorName();
            LOGDEB2(("Call movetoanchor(%s)\n", (const char *)aname.toUtf8()));
            editor->scrollToAnchor(aname);
            // Position the cursor approximately at the anchor (top of
            // viewport) so that searches start from here
            QTextCursor cursor = editor->cursorForPosition(QPoint(0, 0));
            editor->setTextCursor(cursor);
        }
    }


    // Enter document in document history
    string udi;
    if (idoc.getmeta(Rcl::Doc::keyudi, &udi)) {
        historyEnterDoc(g_dynconf, udi);
    }

    editor->setFocus();
    emit(previewExposed(this, m_searchId, docnum));
    LOGDEB(("loadDocInCurrentTab: returning true\n"));
    return true;
}

PreviewTextEdit::PreviewTextEdit(QWidget* parent, const char* nm, Preview *pv) 
    : QTextBrowser(parent), m_preview(pv), 
      m_plaintorich(new PlainToRichQtPreview()), 
      m_dspflds(false), m_docnum(-1) 
{
    setContextMenuPolicy(Qt::CustomContextMenu);
    setObjectName(nm);
    connect(this, SIGNAL(customContextMenuRequested(const QPoint&)),
            this, SLOT(createPopupMenu(const QPoint&)));
    setOpenExternalLinks(false);
    setOpenLinks(false);
}

PreviewTextEdit::~PreviewTextEdit()
{
    delete m_plaintorich;
}

void PreviewTextEdit::createPopupMenu(const QPoint& pos)
{
    LOGDEB1(("PreviewTextEdit::createPopupMenu()\n"));
    QMenu *popup = new QMenu(this);
    switch (m_curdsp) {
    case PTE_DSPTXT:
        popup->addAction(tr("Show fields"), this, SLOT(displayFields()));
        if (!m_image.isNull())
            popup->addAction(tr("Show image"), this, SLOT(displayImage()));
        break;
    case PTE_DSPFLDS:
        popup->addAction(tr("Show main text"), this, SLOT(displayText()));
        if (!m_image.isNull())
            popup->addAction(tr("Show image"), this, SLOT(displayImage()));
        break;
    case PTE_DSPIMG:
    default:
        popup->addAction(tr("Show fields"), this, SLOT(displayFields()));
        popup->addAction(tr("Show main text"), this, SLOT(displayText()));
        break;
    }
    popup->addAction(tr("Select All"), this, SLOT(selectAll()));
    popup->addAction(tr("Copy"), this, SLOT(copy()));
    popup->addAction(tr("Print"), this, SLOT(print()));
    if (prefs.previewPlainPre) {
        popup->addAction(tr("Fold lines"), m_preview, SLOT(togglePlainPre()));
    } else {
        popup->addAction(tr("Preserve indentation"), 
                         m_preview, SLOT(togglePlainPre()));
    }
    // Need to check ipath until we fix the internfile bug that always
    // has it convert to html for top level docs
    if (!m_dbdoc.url.empty() && !m_dbdoc.ipath.empty())
        popup->addAction(tr("Save document to file"), 
                         m_preview, SLOT(emitSaveDocToFile()));
    popup->popup(mapToGlobal(pos));
}

// Display main text
void PreviewTextEdit::displayText()
{
    LOGDEB1(("PreviewTextEdit::displayText()\n"));
    if (m_format == Qt::PlainText)
        setPlainText(m_richtxt);
    else
        setHtml(m_richtxt);
    m_curdsp = PTE_DSPTXT;
}

// Display field values
void PreviewTextEdit::displayFields()
{
    LOGDEB1(("PreviewTextEdit::displayFields()\n"));

    QString txt = "\n";
    txt += "" + QString::fromLocal8Bit(m_url.c_str());
    if (!m_ipath.empty())
        txt += "|" + QString::fromUtf8(m_ipath.c_str());
    txt += "

";
    txt += "\n";
    for (map::const_iterator it = m_fdoc.meta.begin();
         it != m_fdoc.meta.end(); it++) {
        if (!it->second.empty())
            txt += "" + QString::fromUtf8(it->first.c_str()) + " " 
                + "" + QString::fromUtf8(escapeHtml(it->second).c_str()) 
                + "\n";
    }
    txt += "";
    setHtml(txt);
    m_curdsp = PTE_DSPFLDS;
}

void PreviewTextEdit::displayImage()
{
    LOGDEB1(("PreviewTextEdit::displayImage()\n"));
    if (m_image.isNull())
        displayText();

    setPlainText("");
    if (m_image.width() > width() || 
        m_image.height() > height()) {
        m_image = m_image.scaled(width(), height(), Qt::KeepAspectRatio);
    }
    document()->addResource(QTextDocument::ImageResource, QUrl("image"), 
                            m_image);
    QTextCursor cursor = textCursor();
    cursor.insertImage("image");
    m_curdsp = PTE_DSPIMG;
}

void PreviewTextEdit::mouseDoubleClickEvent(QMouseEvent *event)
{
    LOGDEB2(("PreviewTextEdit::mouseDoubleClickEvent\n"));
    QTextEdit::mouseDoubleClickEvent(event);
    if (textCursor().hasSelection() && m_preview)
        m_preview->emitWordSelect(textCursor().selectedText());
}

void PreviewTextEdit::print()
{
    LOGDEB(("PreviewTextEdit::print\n"));
    if (!m_preview)
        return;
        
#ifndef QT_NO_PRINTER
    QPrinter printer;
    QPrintDialog *dialog = new QPrintDialog(&printer, this);
    dialog->setWindowTitle(tr("Print Current Preview"));
    if (dialog->exec() != QDialog::Accepted)
        return;
    QTextEdit::print(&printer);
#endif
}