The beginnings of a command shell geared toward AX.25 clients, with ANSI,...

The beginnings of a command shell geared toward AX.25 clients, with ANSI, colour, and extended ASCII available if the client wants them.
Right now it's enough for reading (and, just barely, posting) messages and changing account settings.

To do:
Create a custom line-by-line message editor.
Cyan should provide an IRC client as well.
Censorship filter either here or in ax25tunnel.js.
Add all kinds of other exciting features.

exec/ax25shell.js

+// ax25shell.js
+// echicken -at- bbs.electronicchicken.com
+// A simple command shell for packet radio users.
+
+load("sbbsdefs.js");
+
+// Colours, in CTRL-A format
+var MENU_SECTION = "\1h\1w";
+var MENU_BRACKET = "\1h\1c";
+var MENU_COLDKEY = "\1h\1w";
+var MENU_SUFFIX = "\1n\1c";
+var PROMPT_COLOR = "\1h\1w";
+var PROMPT_KEY = "\1h\1c";
+
+var attempts = 5;
+var userSettings;
+var userEditor;
+
+// This has some limitations that are probably a non-issue except on systems
+// with excessive numbers of message areas.  Should be fixed at some point.
+var messageAreaSelector = function() {
+	var out = PROMPT_COLOR + "Choose a message group:\r\n\r\n";
+	var promptKeys = [];
+	// I will probably rework the prompt() and menuItem() stuff at some point,
+	// since there's every reason *not* to limit menu commands to one character
+	var theKeys = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ!?@#$%&*+=-^./\[]{}<>;:',`~_";
+	for(var g = 0; g < msg_area.grp_list.length; g++) {
+		out += menuItem(theKeys[g] + " " + msg_area.grp_list[g].name + "\r\n");
+		promptKeys.push(theKeys[g]);
+	}
+	console.putmsg(out + "\r\n");
+	var userInput = prompt("Message group:", promptKeys);
+	if(typeof userInput == "undefined" || userInput == "")
+		return;
+	bbs.curgrp = theKeys.indexOf(userInput);
+	out = PROMPT_COLOR + "\r\nChoose a message area:\r\n\r\n";
+	promptKeys = [];
+	for(var s = 0; s < msg_area.grp_list[userInput].sub_list.length; s++) {
+		out += menuItem(theKeys[s] + " " + msg_area.grp_list[theKeys.indexOf(userInput)].sub_list[s].name + "\r\n");
+		promptKeys.push(theKeys[s]);
+	}
+	console.putmsg(out + "\r\n");
+	userInput = prompt("Message area:", promptKeys);
+	if(typeof userInput == "undefined" || userInput == "")
+		return;
+	bbs.cursub = theKeys.indexOf(userInput);
+	return;
+}
+
+var mainMenu = [
+	{	'section' : 'Messages',
+		'items' : [
+			{	'description' : "New message scan",
+				'action' : bbs.scan_subs
+			},
+			{	'description' : "Read messages",
+				'action' : bbs.scan_msgs
+			},
+			{	'description' : "Post a message",
+				'action' : bbs.post_msg
+			},
+			{	'description' : "Area change",
+				'action' : messageAreaSelector
+			},
+			{	'description' : "Check email",
+				'action' : bbs.read_mail
+			},
+			{	'description' : "Write email",
+				'action' : bbs.email
+			},
+		]
+	},
+	{	'section' : 'System',
+		'items' : [
+			{	'description' : "Your settings",
+				'action' : bbs.user_config
+			
+			},
+			{	'description' : "Goodbye",
+				'action' : false
+			}
+		]
+	}
+];
+
+var init = function() {
+	bbs.replace_text(559, "@SETSTR:Y@@QUESTION@ [Y,N] ");
+	bbs.replace_text(562, "@SETSTR:N@@QUESTION@ [N,Y] ");
+	console.putmsg("Welcome, " + user.alias + "!\r\n");
+	userSettings = user.settings;
+	userEditor = user.editor;
+	getPreferences();
+	user.editor = "";
+}
+
+var prompt = function(promptString, keys) {
+	var attr = console.attributes;
+	console.putmsg(
+		format(
+			"%s%s [%s%s%s]\r\n",
+			PROMPT_COLOR, promptString, PROMPT_KEY, keys.join(), PROMPT_COLOR
+		)
+	);
+	console.attributes = attr;
+	var userInput = "";
+	var tries = 0;
+	while(keys.indexOf(userInput[0]) < 0 && tries < attempts) {
+		userInput = console.getstr("", console.screen_columns, K_UPPER|K_NOECHO).replace(/\[\d*\;\d*\w/g, "");
+		console.putmsg("\r");
+		tries++;
+	}
+	return userInput;
+}
+
+var getPreferences = function() {
+	console.status|=(0<<0); // Unset the CON_R_ECHO bit
+	console.status|=CON_RAW_IN;
+	var fileName = format("%suser/%04u.ax25.ini", system.data_dir, user.number);
+	var f = new File(fileName);
+	if(!f.exists || (f.exists && prompt("Change your terminal settings?", ["Y","N"]) == "Y")) {
+		var us = USER_COLDKEYS|USER_NOPAUSESPIN;
+		if(prompt("Do you have a color terminal?", ["Y","N"]) == "Y")
+			us|=USER_COLOR|USER_ANSI;
+		if(prompt("Does your terminal support IBM extended ASCII?", ["Y","N"]) == "N")
+			us|=USER_NO_EXASCII;
+		if(prompt("Pause after each screenful of data?", ["Y","N"]) == "Y")
+			us|=USER_PAUSE;
+		if(prompt("Clear the screen before new messages?", ["Y","N"]) == "Y")
+			us|=USER_CLRSCRN;
+		f.open((f.exists) ? "r+" : "w+");
+		f.iniSetValue(null, "userSettings", us);
+		f.close();
+		console.putmsg(
+			"Visit us on the internet at " + system.inet_addr + "!\r\n"
+			+ "A password will be required. You can set it via the\r\n"
+			+ "(Y)our settings option on the main menu.\r\n"
+		);
+	} else {
+		f.open("r");
+		var us = f.iniGetValue(null, "userSettings", "number");
+		f.close();
+	}
+	user.settings = us;
+}
+
+var menuItem = function(str) {
+	var coldkey = str[0];
+	var suffix = str.substr(1);
+	str = format(
+		"%s(%s%s%s)%s%s",
+		MENU_BRACKET, MENU_COLDKEY, coldkey, MENU_BRACKET, MENU_SUFFIX, suffix
+	);
+	return str;
+}
+
+var menu = function() {
+	while(!js.terminated) {
+		bbs.menu("head");
+		var out = "";
+		var promptKeys = [];
+		var actions = {};
+		for(var s = 0; s < mainMenu.length; s++) {
+			out += MENU_SECTION + mainMenu[s].section + "\r\n\r\n";
+			var lineLength = 0;
+			for(var i = 0; i < mainMenu[s].items.length; i++) {
+				lineLength += mainMenu[s].items[i].description.length + 1;
+				if(lineLength > 80) {
+					out += "\r\n";
+					lineLength = mainMenu[s].items[i].description.length + 1;
+				}
+				out += menuItem(mainMenu[s].items[i].description) + " ";
+				promptKeys.push(mainMenu[s].items[i].description[0]);
+				actions[mainMenu[s].items[i].description[0]] = mainMenu[s].items[i].action;
+			}
+			out += "\r\n\r\n";
+		}
+		console.putmsg(out);
+		var userInput = prompt("Your choice:", promptKeys);
+		if(typeof userInput == "undefined" || userInput == "")
+			break;
+		if(!actions[userInput])
+			break;
+		actions[userInput]();
+	}
+}
+
+var main = function() {
+	menu();
+}
+
+var cleanUp = function() {
+	user.settings = userSettings;
+	user.editor = userEditor;
+}
+
+js.branch_limit = 0;
+js.on_exit("cleanUp()");
+
+init();
+main();
\ No newline at end of file