deprecate the compat wrapper

after a decade, it's about time to phase it out.

NEWS

@@ -1,3 +1,7 @@
+[1.2.0]
+
+The 'isync' compatibility wrapper is now deprecated.
+
 [1.1.0]
 
 Support for hierarchical mailboxes in Patterns.

src/compat/isync.1

@@ -37,6 +37,9 @@ It will automatically migrate the UID mapping from previous versions of
 \fBmbsync\fR. If you were using \fBisync\fR version 0.8 or 0.9.x you might
 want to use \fBmdconvert\fR to convert the mailboxes to the more efficient
 \fBnative\fR UID storage scheme after migrating them.
+.br
+\fBisync\fR is deprecated. Please use the \fB-w\fR option to permanently
+migrate the configuration and start using \fBmbsync\fR directly.
 ..
 .SH OPTIONS
 .TP

src/compat/main.c

@@ -288,6 +288,9 @@ main( int argc, char **argv )
 		}
 	}
 
+	if (!writeout)
+		fputs( "Notice: please run 'isync -w' and start using 'mbsync' directly.\n", stderr );
+
 	if (config) {
 		if (*config != '/') {
 			if (!getcwd( path1, sizeof(path1) )) {