Cmake build: Creating a define for a header file found

[lyx.git] / src / VCBackend.cpp

diff --git a/src/VCBackend.cpp b/src/VCBackend.cpp
index 599e33136439dbe1255e8315aa22602b6004ee33..8d26df2a6eacf02f651161d5c3b6930cba9e8e63 100644 (file)
--- a/src/VCBackend.cpp
+++ b/src/VCBackend.cpp
@@ -2213,15 +2213,50 @@ void GIT::getLog(FileName const & tmpf)
 }
 
 
-bool GIT::prepareFileRevision(string const & /*revis*/, string & /*f*/)
+//at this moment we don't accept revision SHA, but just number of revision steps back
+//GUI and infrastucture needs to be changed first
+bool GIT::prepareFileRevision(string const & revis, string & f)
 {
-       return false;
+       // anything positive means we got hash, not "0" or minus revision
+       int rev = 1;
+
+       // hash is rarely number and should be long
+       if (isStrInt(revis) && revis.length()<20)
+               rev = convert<int>(revis);
+
+       // revision and filename
+       string pointer;
+
+       // go back for "minus" revisions
+       if (rev <= 0)
+               pointer = "HEAD~" + convert<string>(-rev);
+       // normal hash
+       else
+               pointer = revis;
+
+       pointer += ":";
+
+       FileName tmpf = FileName::tempName("lyxvcrev_" + revis + "_");
+       if (tmpf.empty()) {
+               LYXERR(Debug::LYXVC, "Could not generate logfile " << tmpf);
+               return false;
+       }
+
+       doVCCommand("git show " + pointer + "./"
+                     + quoteName(onlyFileName(owner_->absFileName()))
+                     + " > " + quoteName(tmpf.toFilesystemEncoding()),
+               FileName(owner_->filePath()));
+       if (tmpf.isFileEmpty())
+               return false;
+
+       f = tmpf.absFileName();
+       return true;
 }
 
 
 bool GIT::prepareFileRevisionEnabled()
 {
-       return false;
+       return true;
 }