degesch: some more progress

Whoa, this thing is huge.

Started implementing the basis for IRC and user command handlers.

degesch.c

@@ -78,6 +78,8 @@ static struct config_item g_config_table[] =
 	{ "socks_username",  NULL,    "SOCKS auth. username"                     },
 	{ "socks_password",  NULL,    "SOCKS auth. password"                     },
 
+	{ "isolate_buffers", "off",   "Isolate global/server buffers"            },
+
 	{ ATTR_PROMPT,       NULL,    "Terminal attributes for the prompt"       },
 	{ ATTR_RESET,        NULL,    "String to reset terminal attributes"      },
 	{ ATTR_WARNING,      NULL,    "Terminal attributes for warnings"         },
@@ -244,6 +246,7 @@ struct app_context
 	enum color_mode color_mode;         ///< Colour output mode
 	bool reconnect;                     ///< Whether to reconnect on conn. fail.
 	unsigned long reconnect_delay;      ///< Reconnect delay in seconds
+	bool isolate_buffers;               ///< Isolate global/server buffers
 
 	// Server connection:
 
@@ -810,7 +813,8 @@ buffer_add (struct app_context *ctx, struct buffer *buffer)
 	str_map_set (&ctx->buffers_by_name, buffer->name, buffer);
 	LIST_APPEND_WITH_TAIL (ctx->buffers, ctx->buffers_tail, buffer);
 
-	// TODO: refresh the prompt?  Or caller?
+	// In theory this can't cause changes in the prompt
+	refresh_prompt (ctx);
 }
 
 static void
@@ -848,7 +852,7 @@ buffer_remove (struct app_context *ctx, struct buffer *buffer)
 	if (buffer == ctx->server_buffer)
 		ctx->server_buffer = NULL;
 
-	// TODO: refresh the prompt?  Or caller?
+	refresh_prompt (ctx);
 }
 
 static void
@@ -931,7 +935,7 @@ buffer_activate (struct app_context *ctx, struct buffer *buffer)
 			rl_redisplay ();
 	}
 
-	// TODO: refresh the prompt?  Or caller?
+	refresh_prompt (ctx);
 }
 
 static void
@@ -1395,6 +1399,38 @@ init_readline (void)
 
 // --- Input handling ----------------------------------------------------------
 
+// TODO: we will need a proper mode parser; to be shared with kike
+// TODO: we alse definitely need to parse server capability messages
+
+static void
+irc_handle_ping (struct app_context *ctx, const struct irc_message *msg)
+{
+	if (msg->params.len)
+		irc_send (ctx, "PONG :%s", msg->params.vector[0]);
+	else
+		irc_send (ctx, "PONG");
+}
+
+static struct irc_handler
+{
+	char *name;
+	void (*handler) (struct app_context *ctx, const struct irc_message *msg);
+}
+g_irc_handlers[] =
+{
+	// This list needs to stay sorted
+	// TODO: handle as much as we can
+	{ "PING", irc_handle_ping },
+};
+
+static int
+irc_handler_cmp_by_name (const void *a, const void *b)
+{
+	const struct irc_handler *first  = a;
+	const struct irc_handler *second = b;
+	return strcasecmp_ascii (first->name, second->name);
+}
+
 static void
 irc_process_message (const struct irc_message *msg,
 	const char *raw, void *user_data)
@@ -1414,16 +1450,7 @@ irc_process_message (const struct irc_message *msg,
 			app_readline_restore (&state, ctx->readline_prompt);
 	}
 
-	bool show_to_user = true;
+	if (!ctx->irc_ready && (!strcasecmp (msg->command, "MODE")
-	if (!strcasecmp (msg->command, "PING"))
-	{
-		show_to_user = false;
-		if (msg->params.len)
-			irc_send (ctx, "PONG :%s", msg->params.vector[0]);
-		else
-			irc_send (ctx, "PONG");
-	}
-	else if (!ctx->irc_ready && (!strcasecmp (msg->command, "MODE")
 		|| !strcasecmp (msg->command, "376")    // RPL_ENDOFMOTD
 		|| !strcasecmp (msg->command, "422")))  // ERR_NOMOTD
 	{
@@ -1435,29 +1462,56 @@ irc_process_message (const struct irc_message *msg,
 		if (autojoin)
 			irc_send (ctx, "JOIN :%s", autojoin);
 	}
-	else
-	{
-		// TODO: whatever processing we need
-	}
 
-	// This is going to be a lot more complicated
+	struct irc_handler key = { .name = msg->command };
-	if (show_to_user)
+	struct irc_handler *handler = bsearch (&key, g_irc_handlers,
+		N_ELEMENTS (g_irc_handlers), sizeof key, irc_handler_cmp_by_name);
+	if (handler)
+		handler->handler (ctx, msg);
+
+	// Numerics typically have human-readable information
+	unsigned long dummy;
+	if (xstrtoul (&dummy, msg->command, 10))
 		// TODO: ensure proper encoding
 		// FIXME: print to the server buffer
 		print_status ("%s", raw);
 }
 
-// TODO: load and preprocess this table so that shortcuts are accepted
+// --- User input handling -----------------------------------------------------
-struct command_handler
+
+static void handle_command_help (struct app_context *, const char *);
+
+static void
+handle_command_buffer (struct app_context *ctx, const char *arguments)
+{
+	// TODO: parse the arguments
+}
+
+static void
+handle_command_quit (struct app_context *ctx, const char *arguments)
+{
+	if (ctx->irc_fd != -1)
+	{
+		if (*arguments)
+			irc_send (ctx, "QUIT :%s", arguments);
+		else
+			irc_send (ctx, "QUIT :%s", PROGRAM_NAME " " PROGRAM_VERSION);
+	}
+	initiate_quit (ctx);
+}
+
+static struct command_handler
 {
 	char *name;
 	void (*handler) (struct app_context *ctx, const char *arguments);
+	// TODO: probably also a usage string
 }
-g_handlers[] =
+g_command_handlers[] =
 {
-	{ "buffer",  NULL },
+	{ "help",    handle_command_help   },
-	{ "help",    NULL },
+	{ "quit",    handle_command_quit   },
-
+	{ "buffer",  handle_command_buffer },
+#if 0
 	{ "msg",     NULL },
 	{ "query",   NULL },
 	{ "notice",  NULL },
@@ -1483,17 +1537,93 @@ g_handlers[] =
 	{ "motd",    NULL },
 	{ "away",    NULL },
 	{ "quote",   NULL },
-	{ "quit",    NULL },
+#endif
 };
 
 static void
-process_internal_command (struct app_context *ctx, const char *command)
+handle_command_help (struct app_context *ctx, const char *arguments)
 {
-	// TODO: resolve commands from a map
+	// TODO: show a list of all user commands
+}
+
+static int
+command_handler_cmp_by_length (const void *a, const void *b)
+{
+	const struct command_handler *first  = a;
+	const struct command_handler *second = b;
+	return strlen (first->name) - strlen (second->name);
+}
+
+static void
+init_partial_matching_user_command_map (struct str_map *partial)
+{
+	str_map_init (partial);
+	partial->key_xfrm = tolower_ascii_strxfrm;
+
+	// We process them from the longest to the shortest one,
+	// so that common prefixes favor shorter entries
+	struct command_handler *by_length[N_ELEMENTS (g_command_handlers)];
+	for (size_t i = 0; i < N_ELEMENTS (by_length); i++)
+		by_length[i] = &g_command_handlers[i];
+	qsort (by_length, N_ELEMENTS (by_length), sizeof *by_length,
+		command_handler_cmp_by_length);
+
+	for (size_t i = N_ELEMENTS (by_length); i--; )
+	{
+		char *copy = xstrdup (by_length[i]->name);
+		for (size_t part = strlen (copy); part; part--)
+		{
+			copy[part] = '\0';
+			str_map_set (partial, copy, by_length[i]);
+		}
+		free (copy);
+	}
+}
+
+static void
+process_user_command (struct app_context *ctx, char *command)
+{
+	// Trivially create a partial matching map
+	static bool initialized = false;
+	struct str_map partial;
+	if (!initialized)
+	{
+		init_partial_matching_user_command_map (&partial);
+		initialized = true;
+	}
+
+	// TODO: cut a single word (strtok_r()?)
 	// TODO: if it's a number, switch to the given buffer
 
-	if (!strcmp (command, "quit"))
+	struct command_handler *handler = str_map_find (&partial, command);
-		initiate_quit (ctx);
+	if (handler)
+		// FIXME: pass arguments correctly
+		handler->handler (ctx, "");
+}
+
+static void
+send_message_to_current_buffer (struct app_context *ctx, char *message)
+{
+	struct buffer *buffer = ctx->current_buffer;
+	if (!buffer)
+	{
+		// TODO: print an error message to the global buffer
+		return;
+	}
+
+	switch (buffer->type)
+	{
+	case BUFFER_GLOBAL:
+	case BUFFER_SERVER:
+		// TODO: print a message to the buffer that it's not a channel
+		break;
+	case BUFFER_CHANNEL:
+		// TODO: send an IRC message to the channel
+		break;
+	case BUFFER_PM:
+		// TODO: send an IRC message to the user
+		break;
+	}
 }
 
 static void
@@ -1503,19 +1633,12 @@ process_input (struct app_context *ctx, char *user_input)
 	size_t len;
 
 	if (!(input = iconv_xstrdup (ctx->term_to_utf8, user_input, -1, &len)))
-	{
 		print_error ("character conversion failed for `%s'", "user input");
-		goto fail;
+	else if (input[0] == '/' && input[1] != '/')
-	}
+		process_user_command (ctx, input + 1);
-
-	if (*input == '/')
-		process_internal_command (ctx, input + 1);
 	else
-	{
+		send_message_to_current_buffer (ctx, input);
-		// TODO: send a message to the current buffer
-	}
 
-fail:
 	free (input);
 }
 
@@ -2048,7 +2171,10 @@ load_config (struct app_context *ctx, struct error **e)
 	if (!success)
 		return false;
 
-	if (!irc_get_boolean_from_config (ctx, "reconnect", &ctx->reconnect, e))
+	if (!irc_get_boolean_from_config (ctx,
+		"reconnect", &ctx->reconnect, e)
+	 || !irc_get_boolean_from_config (ctx,
+		"isolate_buffers", &ctx->isolate_buffers, e))
 		return false;
 
 	const char *delay_str = str_map_find (&ctx->config, "reconnect_delay");