+ // 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 += ':';
+
+ TempFile tempfile("lyxvcrev_" + revis + '_');
+ tempfile.setAutoRemove(false);
+ FileName tmpf = tempfile.name();
+ 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()));
+ tmpf.refresh();
+ if (tmpf.isFileEmpty())
+ return false;
+
+ f = tmpf.absFileName();
+ return true;