X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2FVCBackend.cpp;h=5bbc1746b417ae0dd2720dbb4c575a4d8076e637;hb=b8550d11e836e857967a31250e6ca248b2d43f82;hp=bf52e7006b7ec430142b8980ea2cf3850e3d527e;hpb=3309cdca59e1db68c42fc572f9540c56565ef0e0;p=lyx.git

diff --git a/src/VCBackend.cpp b/src/VCBackend.cpp
index bf52e7006b..5bbc1746b4 100644
--- a/src/VCBackend.cpp
+++ b/src/VCBackend.cpp
@@ -290,15 +290,52 @@ string RCS::revisionInfo(LyXVC::RevisionInfo const info)
 }
 
 
-bool RCS::prepareFileRevision(string const &, string &)
+bool RCS::prepareFileRevision(string const &revis, string & f)
 {
-	return false;
+	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 false;
+	return true;
 }
 
 
@@ -375,7 +412,7 @@ void CVS::scanMaster()
 				locker_ = "Unlocked";
 				vcstatus = UNLOCKED;
 			} else {
-				// Here we should also to some more checking
+				// Here we should also do some more checking
 				// to see if there are conflicts or not.
 				locker_ = "Locked";
 				vcstatus = LOCKED;
@@ -706,13 +743,13 @@ void SVN::fileLock(bool lock, FileName const & tmpf, string &status)
 
 	if (!isLocked() && lock)
 		frontend::Alert::error(_("Revision control error."),
-			_("Error when acquiring write lock.\n"
-			"Most probably another user is editing\n"
+			_("Error while acquiring write lock.\n"
+			"Another user is most probably editing\n"
 			"the current document now!\n"
 			"Also check the access to the repository."));
 	if (isLocked() && !lock)
 		frontend::Alert::error(_("Revision control error."),
-			_("Error when releasing write lock.\n"
+			_("Error while releasing write lock.\n"
 			"Check the access to the repository."));
 }
 
@@ -730,7 +767,7 @@ string SVN::checkOut()
 		    FileName(owner_->filePath()));
 
 	string log;
-	string res = scanLogFile(tmpf, log);
+	string const res = scanLogFile(tmpf, log);
 	if (!res.empty())
 		frontend::Alert::error(_("Revision control error."),
 			bformat(_("Error when updating from repository.\n"