1 files changed, 85 insertions, 0 deletions
diff --git a/lib/versioning.h b/lib/versioning.h
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--- /dev/null
+++ b/lib/versioning.h
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+// **************************************************************************
+// * This file is part of the FreeFileSync project. It is distributed under *
+// * GNU General Public License: http://www.gnu.org/licenses/gpl.html       *
+// * Copyright (C) ZenJu (zenju AT gmx DOT de) - All Rights Reserved        *
+// **************************************************************************
+
+#ifndef VERSIONING_HEADER_8760247652438056
+#define VERSIONING_HEADER_8760247652438056
+
+#include <vector>
+#include <functional>
+#include <zen/time.h>
+#include <zen/zstring.h>
+#include <zen/int64.h>
+#include <zen/file_error.h>
+
+namespace zen
+{
+struct CallbackMoveFile;
+
+//e.g. move C:\Source\subdir\Sample.txt -> D:\Revisions\subdir\Sample.txt 2012-05-15 131513.txt
+//scheme: <revisions directory>\<relpath>\<filename>.<ext> YYYY-MM-DD HHMMSS.<ext>
+/*
+	- ignores missing source files/dirs
+	- creates missing intermediate directories
+	- does not create empty directories
+	- handles symlinks
+	- ignores already existing target files/dirs (support retry)
+		=> (unlikely) risk of data loss: race-condition if two FFS instances start at the very same second and process the same filename!!
+*/
+
+class FileVersioner
+{
+public:
+    FileVersioner(const Zstring& versioningDirectory, //throw FileError
+                  const TimeComp& timeStamp,
+                  int versionCountLimit) : //max versions per file; < 0 := no limit
+        versioningDirectory_(versioningDirectory),
+        timeStamp_(formatTime<Zstring>(Zstr("%Y-%m-%d %H%M%S"), timeStamp)), //e.g. "2012-05-15 131513"
+        versionCountLimit_(versionCountLimit)
+    {
+        if (timeStamp_.size() != 17) //formatTime() returns empty string on error; unexpected length: e.g. problem in year 10000!
+            throw FileError(_("Failure to create time stamp for versioning:") + L" \'" + timeStamp_ + L"\'");
+    }
+
+    void revisionFile(const Zstring& sourceFile, const Zstring& relativeName, CallbackMoveFile& callback); //throw FileError
+    void revisionDir (const Zstring& sourceDir,  const Zstring& relativeName, CallbackMoveFile& callback); //throw FileError
+
+    void limitVersions(std::function<void()> updateUI); //throw FileError; call when done revisioning!
+
+private:
+    const Zstring versioningDirectory_;
+    const Zstring timeStamp_;
+    const int versionCountLimit_;
+
+    std::vector<Zstring> fileRelnames; //store list of revisioned files and symlinks (relativeName) for limitVersions()
+};
+
+
+struct CallbackMoveFile
+{
+    virtual ~CallbackMoveFile() {} //see CallbackCopyFile for limitations when throwing exceptions!
+
+    virtual void onBeforeFileMove(const Zstring& fileFrom, const Zstring& fileTo) = 0; //one call before each (planned) move
+    virtual void onBeforeDirMove (const Zstring& dirFrom,  const Zstring& dirTo ) = 0; //
+    virtual void objectProcessed() = 0; //one call after each completed move (count objects total)
+
+    //called frequently if move has to revert to copy + delete:
+    virtual void updateStatus(Int64 bytesDelta) = 0;
+};
+
+
+
+
+
+
+
+
+namespace impl //declare for unit tests:
+{
+bool isMatchingVersion(const Zstring& shortname, const Zstring& shortnameVersion);
+}
+}
+
+#endif //VERSIONING_HEADER_8760247652438056