Report available commands on ambiguous commands. Tidy TODO a bit.

CHANGES

@@ -1,3 +1,7 @@
+16 November 2007
+
+* (nicm) List available commands on ambiguous command.
+
 12 November 2007
 
 * (nicm) If the terminal supports default colours (AX present), force black 
@@ -206,4 +210,4 @@
   (including mutt, emacs). No status bar yet and no key remapping or other
   customisation.
 
-$Id: CHANGES,v 1.67 2007-11-12 20:29:43 nicm Exp $
+$Id: CHANGES,v 1.68 2007-11-16 13:23:59 nicm Exp $

TODO

@@ -1,5 +1,5 @@
 - it would be nice if there wasn't so much copying buffers about, audit uses
-- useful env vars like WINDOW
+- useful env vars like WINDOW?
 - sort out who controls the buffers in local.c a bit
 - better checking/emulation for missing term requirements
 - alt charset, borders etc (terminfo(5)/Line Graphics)
@@ -25,7 +25,7 @@
 - client could pass term/tty fd up to server and then do nothing. what problems 
   would this cause? -- need access to all terminfo data at once... signals?
 - cleanup/redesign IPC
-	IPC is slightly arse-about-face: too much overhead. 8-byte header for
+	IPC is slightly arse-about-face: overhead? 8-byte header for
 	each packet... hrm. already scanning output for \e, could add an extra
 	byte to it for message
 - could use bsearch all over the place or get rid of smaller tables (clientmsg)
@@ -34,7 +34,6 @@
 - CLIENT_HOLD sucks
 - session with CMD_NOSESSION should be an error
 - each command should have a print op as well for list keys
-- List available commands on ambigous command
 - Implicitly add exec to the commands for new windows (switch to disable it)
 - nested sessions, ie session as window - moving to it moves into session
   (remembering parent)
@@ -44,27 +43,25 @@
 - status-fg/status-bg should be to set attributes: bold, etc
 - show-options command
 - detach client and other client commands. note that there can only be a
-  "current client" on key presses - these should act like detach-session -
-  -a will do all clients, otherwise do nothing unless key in which case do
-  current client
+  "current client" on key presses - these should probably act like
+  detach-session: -a will do all clients, otherwise use current client if
+  key, else do nothing
 - check handling of out-of-bound values in input.c, most should be limited
   rather than ignored
 - save/restore (DECSC/DECRC) are ugly. maybe a struct screen_attr and memcpy
 - force maximum terminal size (centred?)
 - per-session toolbar state, other options
-- commands:
-	kill server
 - force-default option: assume terminal supports default colours even if AX
   is missing (like, eg, xterm-color in an aterm)
 - refer to windows by name etc (duplicates?)
-- command to run something without a window at all
-- command to insert a key into a window
-- function groups:
-	bind-key ^W { select-window 0; send-key ^W }
-	etc
+- commands:
+	kill server
+	command to run something without a window at all?
+	command to insert a key into a window (send-key)
+- function groups, bind-key ^W { select-window 0; send-key ^W } etc
+- more(1) style handling for in-client output
 
 -- For 0.1 --------------------------------------------------------------------
-- fix most(1) problems after scrolling
 - fix mutt problems with redraw (mutt's) status line when reading mail
 
 -- For 0.2 --------------------------------------------------------------------

cmd.c

@@ -1,4 +1,4 @@
-/* $Id: cmd.c,v 1.26 2007-11-12 14:21:40 nicm Exp $ */
+/* $Id: cmd.c,v 1.27 2007-11-16 13:23:59 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -57,6 +57,7 @@ cmd_parse(int argc, char **argv, char **cause)
 {
 	const struct cmd_entry **entryp, *entry;
 	struct cmd	        *cmd;
+	char			 s[BUFSIZ];
 	int			 opt;
 
 	*cause = NULL;
@@ -73,10 +74,8 @@ cmd_parse(int argc, char **argv, char **cause)
 
 		if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
 			continue;
-		if (entry != NULL) {
-			xasprintf(cause, "ambiguous command: %s", argv[0]);
-			return (NULL);
-		}
+		if (entry != NULL)
+			goto ambiguous;
 		entry = *entryp;
 	}
 	if (entry == NULL) {
@@ -108,6 +107,20 @@ cmd_parse(int argc, char **argv, char **cause)
 	}
 	return (cmd);
 
+ambiguous:
+	*s = '\0';
+	for (entryp = cmd_table; *entryp != NULL; entryp++) {
+		if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
+			continue;
+		if (strlcat(s, (*entryp)->name, sizeof s) >= sizeof s)
+			break;
+		if (strlcat(s, ", ", sizeof s) >= sizeof s)
+			break;
+	}
+	s[strlen(s) - 2] = '\0';
+	xasprintf(cause, "ambiguous command: %s, could be: %s", argv[0], s);
+	return (NULL);
+
 usage:
 	usage(cause, "%s %s", entry->name, entry->usage);
 	return (NULL);