# HG changeset patch
# User paulo@thepaulopc
# Date 1290069104 28800
# Node ID 74cf5cfa3ec1a5303003f16c5f3c365bbc20b73c
# Parent  acf12a2e872d0514e36c9cccec476ee2f643046e
rcg.c: add usage help statement

diff -r acf12a2e872d -r 74cf5cfa3ec1 rcg.c
--- a/rcg.c	Fri Nov 12 00:13:48 2010 -0800
+++ b/rcg.c	Thu Nov 18 00:31:44 2010 -0800
@@ -86,7 +86,24 @@
 
 Exit_code args_error()
 {
-	fprintf(stderr, "Invalid or nonexistent argument. \n");
+	char *usage = "\
+Usage: rcg [options] <PATTERN> \n\
+\n\
+Options: \n\
+  -l, --line           Highlight whole line \n\
+  -B, --bold           Bold \n\
+  -b <color>           Background color \n\
+  -f <color>           Foreground color \n\
+\n\
+<color> can be one of the following: \n\
+"; 
+
+	fprintf(stdout, usage);
+
+	Colors *c;
+	for (c = COLORS; c->name; c++)
+		fprintf(stdout, "  %s \n", c->name);
+
 	return EXIT_ARGS_ERROR;
 }