domain.cpp

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/*
        Author: Marco Costalba (C) 2005-2006

        Copyright: See COPYING file that comes with this distribution

*/
#include <qapplication.h>
#include <qlistview.h>
#include "exceptionmanager.h"
#include "mainimpl.h"
#include "git.h"
#include "domain.h"

using namespace QGit;

void StateInfo::S::clear() {

        sha = fn = dtSha = "";
        isM = allM = false;
        sel = true;
}

bool StateInfo::S::operator==(const StateInfo::S& st) const {

        if (&st == this)
                return true;

        return (   sha   == st.sha
                && fn    == st.fn
                && dtSha == st.dtSha
                && sel   == st.sel
                && isM   == st.isM
                && allM  == st.allM);
}

bool StateInfo::S::operator!=(const StateInfo::S& st) const {

        return !(StateInfo::S::operator==(st));
}

void StateInfo::clear() {

        nextS.clear();
        curS.clear();
        prevS.clear();
        isLocked = false;
}

StateInfo& StateInfo::operator=(const StateInfo& newState) {

        if (&newState != this) {
                if (isLocked)
                        nextS = newState.curS;
                else
                        curS = newState.curS; // prevS is mot modified to allow a rollback
        }
        return *this;
}

bool StateInfo::operator==(const StateInfo& newState) const {

        if (&newState == this)
                return true;

        return (curS == newState.curS); // compare is made on curS only
}

bool StateInfo::operator!=(const StateInfo& newState) const {

        return !(StateInfo::operator==(newState));
}

bool StateInfo::isChanged(uint what) const {

        bool ret = false;
        if (what & SHA)
                ret = (sha(true) != sha(false));

        if (!ret && (what & FILE_NAME))
                ret = (fileName(true) != fileName(false));

        if (!ret && (what & DIFF_TO_SHA))
                ret = (diffToSha(true) != diffToSha(false));

        if (!ret && (what & ALL_MERGE_FILES))
                ret = (allMergeFiles(true) != allMergeFiles(false));

        return ret;
}

// ************************* Domain ****************************

Domain::Domain(MainImpl* m, Git* g) : QObject(m), git(g) {

        EM_INIT(exDeleteRequest, "Deleting domain");
        EM_INIT(exCancelRequest, "Canceling update");

        st.clear();
        busy = readyToDrag = dragging = dropping = linked = false;
        popupType = 0;
        tabPosition = -1;

        connect(m, SIGNAL(tabClosed(int)), this, SLOT(on_tabClosed(int)));
}

void Domain::on_closeAllTabs() {

        delete this; // must be sync, deleteLater() does not work
}

void Domain::deleteWhenDone() {

        if (!EM_IS_PENDING(exDeleteRequest))
                EM_RAISE(exDeleteRequest);

        emit cancelDomainProcesses();

        on_deleteWhenDone();
}

void Domain::on_deleteWhenDone() {

        if (!EM_IS_PENDING(exDeleteRequest))
                deleteLater();
        else
                QTimer::singleShot(20, this, SLOT(on_deleteWhenDone()));
}

void Domain::on_tabClosed(int tabPos) {

        if (tabPosition > tabPos)
                tabPosition--;
}

void Domain::setThrowOnDelete(bool b) {

        if (b)
                EM_REGISTER(exDeleteRequest);
        else
                EM_REMOVE(exDeleteRequest);
}

bool Domain::isThrowOnDeleteRaised(int excpId, SCRef curContext) {

        return EM_MATCH(excpId, exDeleteRequest, curContext);
}

MainImpl* Domain::m() const {

        return static_cast<MainImpl*>(parent());
}

const QString Domain::dragHostName() const {

        return QString::fromLatin1("@") + m()->curWorkDir();
}

bool Domain::setReadyToDrag(bool b) {

        readyToDrag = (b && !busy && !dragging && !dropping);
        return readyToDrag;
}

bool Domain::setDragging(bool b) {

        bool dragFinished = (!b && dragging);

        dragging = (b && readyToDrag && !dropping);

        if (dragging)
                readyToDrag = false;

        if (dragFinished)
                flushQueue();

        return dragging;
}

void Domain::unlinkDomain(Domain* d) {

        d->linked = false;
        while (d->disconnect(SIGNAL(updateRequested(StateInfo)), this))
                ;// a signal is emitted for every connection you make,
                 // so if you duplicate a connection, two signals will be emitted.
}

void Domain::linkDomain(Domain* d) {

        unlinkDomain(d); // be sure only one connection is active
        connect(d, SIGNAL(updateRequested(StateInfo)), this, SLOT(on_updateRequested(StateInfo)));
        d->linked = true;
}

void Domain::on_updateRequested(StateInfo newSt) {

        st = newSt;
        UPDATE();
}

bool Domain::flushQueue() {
// during dragging any state update is queued, so try to flush pending now

        if (!busy && st.flushQueue()) {
                UPDATE();
                return true;
        }
        return false;
}

void Domain::customEvent(QCustomEvent* e) {

        bool fromMaster = false;

        switch (e->type()) {
        case UPD_DM_MST_EV:
                fromMaster = true;
                // fall through
        case UPD_DM_EV:
                update(fromMaster, ((UpdateDomainEvent*)e)->isForced());
                break;
        case MSG_EV:
                if (!busy && !st.requestPending())
                        QApplication::postEvent(m(), new MessageEvent(((MessageEvent*)e)->myData()));
                else // waiting for the end of updating
                        statusBarRequest = ((MessageEvent*)e)->myData();
                break;
        default:
                break;
        }
        QObject::customEvent(e);
}

void Domain::populateState() {

        const Rev* r = git->revLookup(st.sha());
        if (r)
                st.setIsMerge(r->parentsCount() > 1);
}

void Domain::update(bool fromMaster, bool force) {

        if (busy && st.requestPending()) {
                // quick exit current (obsoleted) update but only if state
                // is going to change. Without this check calling update()
                // many times with the same data nullify the update
                EM_RAISE(exCancelRequest);
                emit cancelDomainProcesses();
        }
        if (busy || dragging)
                return;

        if (linked && !fromMaster) {
                // in this case let the update to fall down from master domain
                StateInfo tmp(st);
                st.rollBack(); // we don't want to filter out next update sent from master
                emit updateRequested(tmp);
                return;
        }
        try {
                EM_REGISTER_Q(exCancelRequest); // quiet, no messages when thrown
                setThrowOnDelete(true);
                git->setThrowOnStop(true);
                git->setCurContext(this);
                busy = true;
                setReadyToDrag(false); // do not start any drag while updating
                populateState(); // complete any missing state information
                st.setLock(true); // any state change will be queued now

                if (doUpdate(force))
                        st.commit();
                else
                        st.rollBack();

                st.setLock(false);
                busy = false;
                if (git->curContext() != this)
                        qDebug("ASSERT in Domain::update, context is %p "
                               "instead of %p", (void*)git->curContext(), (void*)this);

                git->setCurContext(NULL);
                git->setThrowOnStop(false);
                setThrowOnDelete(false);
                EM_REMOVE(exCancelRequest);

        } catch (int i) {

                /*
                   If we have a cancel request because of a new update is in queue we
                   cannot roolback current state to avoid new update is filtered out
                   in case rolled back sha and new sha are the same.
                   This could happen with arrow navigation:

                   sha -> go UP (new sha) -> go DOWN (cancel) -> rollback to sha

                   And pending request 'sha' is filtered out leaving us in an
                   inconsistent state.
                */
                st.commit();
                st.setLock(false);
                busy = false;
                git->setCurContext(NULL);
                git->setThrowOnStop(false);
                setThrowOnDelete(false);
                EM_REMOVE(exCancelRequest);

                if (QApplication::overrideCursor())
                        QApplication::restoreOverrideCursor();

                QString context("updating ");
                if (git->isThrowOnStopRaised(i,  context + className())) {
                        EM_THROW_PENDING;
                        return;
                }
                if (isThrowOnDeleteRaised(i,  context + className())) {
                        EM_THROW_PENDING;
                        return;
                }
                if (i == exCancelRequest)
                        EM_THROW_PENDING;
                        // do not return
                else {
                        const QString info("Exception \'" + EM_DESC(i) + "\' "
                                           "not handled in init...re-throw");
                        dbs(info);
                        throw;
                }
        }
        bool nextRequestPending = flushQueue();

        if (!nextRequestPending && !statusBarRequest.isEmpty()) {
                // update status bar when we are sure no more work is pending
                QApplication::postEvent(m(), new MessageEvent(statusBarRequest));
                statusBarRequest = "";
        }
        if (!nextRequestPending && popupType)
                sendPopupEvent();
}

void Domain::sendPopupEvent() {

        // call an async context popup, must be executed
        // after returning to event loop
        DeferredPopupEvent* e = new DeferredPopupEvent(popupData, popupType);
        QApplication::postEvent(m(), e);
        popupType = 0;
}

void Domain::on_contextMenu(const QString& data, int type) {

        popupType = type;
        popupData = data;

        if (busy)
                return; // we are in the middle of an update

        // if list view is already updated pop-up
        // context menu, otherwise it means update()
        // has still not been called, a pop-up request,
        // will be fired up at the end of next update()
        if ((type == POPUP_LIST_EV) && (data != st.sha()))
                return;

        sendPopupEvent();
}

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