Add a per-client log of status line messages displayed while that client

exists. A new message-limit session option sets the maximum number of entries
and a command, show-messages, shows the log (bound to ~ by default).

This (and prompt history) might be better as a single global log but until
there are global options it is easier for them to be per client.

cmd-show-messages.c

@@ -0,0 +1,65 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <string.h>
+#include <time.h>
+
+#include "tmux.h"
+
+/*
+ * Show client message log.
+ */
+
+int	cmd_show_messages_exec(struct cmd *, struct cmd_ctx *);
+
+const struct cmd_entry cmd_show_messages_entry = {
+	"show-messages", "showmsgs",
+	CMD_TARGET_CLIENT_USAGE,
+	0, "",
+	cmd_target_init,
+	cmd_target_parse,
+	cmd_show_messages_exec,
+	cmd_target_free,
+	cmd_target_print
+};
+
+int
+cmd_show_messages_exec(struct cmd *self, struct cmd_ctx *ctx)
+{
+	struct cmd_target_data		*data = self->data;
+	struct client			*c;
+	struct message_entry		*msg;
+	char				*tim;
+	u_int				 i;
+
+	if ((c = cmd_find_client(ctx, data->target)) == NULL)
+		return (-1);
+
+	for (i = 0; i < ARRAY_LENGTH(&c->message_log); i++) {
+		msg = &ARRAY_ITEM(&c->message_log, i);
+
+		tim = ctime(&msg->msg_time);
+		*strchr(tim, '\n') = '\0';
+		
+		ctx->print(ctx, "%s %s", tim, msg->msg);
+	}
+
+	return (0);
+}