patchAdd support for --early-output option of git log command

src/common.h, src/git.cpp, src/git.h, src/git_startup.cpp

diff --git a/src/common.h b/src/common.h
index 198348e..de3cb7d 100644
--- a/src/common.h
+++ b/src/common.h
@@ -289,7 +289,7 @@ namespace QGit {
 class Rev {
 	// prevent implicit C++ compiler defaults
 	Rev();
-	Rev(const Rev&);
+// 	Rev(const Rev&);
 	Rev& operator=(const Rev&);
 public:
 	Rev(const QByteArray& b, uint s, int idx, int* next, bool withDiff)
diff --git a/src/git.cpp b/src/git.cpp
index d273c60..ef9b627 100644
--- a/src/git.cpp
+++ b/src/git.cpp
@@ -73,9 +73,11 @@ const QString FileHistory::sha(int row) const {
 	return (row < 0 || row >= _rowCnt ? "" : revOrder.at(row));
 }

-void FileHistory::clear() {
+void FileHistory::clear(bool earlyOutput) {
+
+	if (!earlyOutput)
+		git->cancelDataLoading(this);

-	git->cancelDataLoading(this);
 	qDeleteAll(revs);
 	revs.clear();
 	revOrder.clear();
@@ -83,9 +85,11 @@ void FileHistory::clear() {
 	lns->clear();
 	fNames.clear();
 	curFNames.clear();
-	qDeleteAll(rowData);
-	rowData.clear();

+	if (!earlyOutput) {
+		qDeleteAll(rowData);
+		rowData.clear();
+	}
 	if (testFlag(REL_DATE_F)) {
 		_secs = QDateTime::currentDateTime().toTime_t();
 		_headerInfo[4] = "Last Change";
diff --git a/src/git.h b/src/git.h
index de014e0..92879fb 100644
--- a/src/git.h
+++ b/src/git.h
@@ -27,7 +27,7 @@ Q_OBJECT
 public:
 	FileHistory(QObject* parent, Git* git);
 	~FileHistory();
-	void clear();
+	void clear(bool earlyOutput = false);
 	const QString sha(int row) const;
 	int row(SCRef sha) const;
 	const QStringList fileNames() const { return fNames; }
@@ -251,6 +251,7 @@ private:
 	bool startParseProc(SCList initCmd, FileHistory* fh, SCRef buf);
 	bool tryFollowRenames(FileHistory* fh);
 	bool populateRenamedPatches(SCRef sha, SCList nn, FileHistory* fh,
QStringList* on, bool bt);
+	void doEarlyOutput(Rev* rev, int* start);
 	int addChunk(FileHistory* fh, const QByteArray& ba, int ofs);
 	void parseDiffFormat(RevFile& rf, SCRef buf);
 	void parseDiffFormatLine(RevFile& rf, SCRef line, int parNum);
diff --git a/src/git_startup.cpp b/src/git_startup.cpp
index 3faa059..df272fc 100644
--- a/src/git_startup.cpp
+++ b/src/git_startup.cpp
@@ -492,7 +492,9 @@ bool Git::startRevList(SCList args, FileHistory* fh) {
 	   the file deletion revision.
 	*/
 		initCmd << QString("-r -m -p --full-index").split(' ');
-	}
+	} else
+		initCmd << QString("--early-output");
+
 	return startParseProc(initCmd + args, fh, QString());
 }

@@ -839,13 +841,38 @@ void Git::loadFileNames() {
 	indexTree();
 }

+void Git::doEarlyOutput(Rev* rev, int* start) {
+
+	delete rev;
+	*start += QString("Final output:\n").length();
+
+	Rev* cl = NULL;
+	const Rev* r = revLookup(ZERO_SHA);
+	if (r)
+		cl = new Rev(*r); // copy working dir revision
+
+	revData->clear(true); // keep row QByteArray data
+
+	if (cl) { // re-add working dir revision
+		revData->revs.insert(ZERO_SHA, cl);
+		revData->revOrder.append(ZERO_SHA);
+	}
+}
+
 int Git::addChunk(FileHistory* fh, const QByteArray& ba, int start) {

 	RevMap& r = fh->revs;
 	int nextStart;
+	Rev* rev;

-	// only here we create a new rev
-	Rev* rev = new Rev(ba, start, fh->revOrder.count(), &nextStart,
!isMainHistory(fh));
+	do {
+		// only here we create a new rev
+		rev = new Rev(ba, start, fh->revOrder.count(), &nextStart,
!isMainHistory(fh));
+
+		if (nextStart == -2)
+			doEarlyOutput(rev, &start);
+
+	} while (nextStart == -2);

 	if (nextStart == -1) { // half chunk detected
 		delete rev;
@@ -1331,6 +1358,7 @@ int Rev::indexData(bool quick, bool withDiff) const {
 /*
   This is what 'git log' produces:

+	- a possible one line with "Final output:\n" in case of --early-output option
 	- one line with "commit" + sha + an arbitrary amount of parent's sha, in case
 	  of a merge in file history the line terminates with "(from <sha of parent>)"
 	- one line with "log size" + len of this record
@@ -1346,9 +1374,12 @@ int Rev::indexData(bool quick, bool withDiff) const {
 	- a terminating '\0'
 */
 	int last = ba.size() - 1;
-	if (start > last)
+	if (start > last) // offset 'start' points to the char after "commit "
 		return -1;

+	if (uint(ba.at(start) == 'u'))
+		return -2; // "Final output:", let caller handle this
+
 	// take in account --boundary and --left-right options
 	startOfs = uint(ba.at(start) == '-' || ba.at(start) == '<' ||
ba.at(start) == '>');
 	boundary = startOfs && ba.at(start) == '-';