+bool RCS::prepareFileRevision(string const &revis, string & f)
+{
+ string rev = revis;
+
+ if (isStrInt(rev)) {
+ int back = convert<int>(rev);
+ if (back > 0)
+ return false;
+ if (back == 0)
+ rev = version_;
+ // we care about the last number from revision string
+ // in case of backward indexing
+ if (back < 0) {
+ string cur, base;
+ cur = rsplit(version_, base , '.' );
+ if (!isStrInt(cur))
+ return false;
+ int want = convert<int>(cur) + back;
+ if (want <= 0)
+ return false;
+
+ rev = base + "." + convert<string>(want);
+ }
+ }
+
+ FileName tmpf = FileName::tempName("lyxvcrev");
+ if (tmpf.empty()) {
+ LYXERR(Debug::LYXVC, "Could not generate logfile " << tmpf);
+ return N_("Error: Could not generate logfile.");
+ }
+
+ doVCCommand("co -p" + rev + " "
+ + quoteName(onlyFilename(owner_->absFileName()))
+ + " > " + quoteName(tmpf.toFilesystemEncoding()),
+ FileName(owner_->filePath()));
+ if (tmpf.isFileEmpty())
+ return false;
+
+ f = tmpf.absFilename();
+ return true;
+}
+
+
+bool RCS::prepareFileRevisionEnabled()
+{
+ return true;
+}
+
+