Add basic reading main.ini and file.ini (not all sections)

This should be enough for Nelgin to make progress with his user defaults menu
script.

Not all sections are read and parsed and there will be some extra properties
(e.g. "code" in repeated sections that don't normally have that), so the
returned objects aren't (yet) suitable for re-writing back to the *.ini files.

I also cleaned up some of the exceptions (throwing strings rather than Errors)
and removed some empty functions.

exec/load/cfglib.js

@@ -10,14 +10,30 @@ function read_sections(f, prefix)
 
 function read_main_ini(filename)
 {
-}
-
-function read_msgs_ini(filename)
-{
+	var f = new File(filename);
+	if(!f.open("r"))
+		throw new Error("Error " + f.error + " opening " + f.name);
+	var obj = f.iniGetObject();
+	obj.newuser = f.iniGetObject("newuser");
+	obj.expired = f.iniGetObject("expired");
+	obj.mqtt = f.iniGetObject("MQTT");
+	obj.module = f.iniGetObject("module");
+	obj.shell = read_sections(f, "shell:");
+	return obj;
 }
 
 function read_file_ini(filename)
 {
+	var f = new File(filename);
+	if(!f.open("r"))
+		throw new Error("Error " + f.error + " opening " + f.name);
+	var obj = f.iniGetObject();
+	obj.extractor = read_sections(f, "extractor:");
+	obj.compressor = read_sections(f, "compressor:");
+	obj.viewer = read_sections(f, "viewer:");
+	obj.tester = read_sections(f, "tester:");
+	obj.protocol = read_sections(f, "protocol:");
+	return obj;
 }
 
 function find_xtrn_sec(obj, code)
@@ -33,7 +49,7 @@ function read_xtrn_ini(filename)
 {
 	var f = new File(filename);
 	if(!f.open("r"))
-		throw "Error " + f.error + " opening " + f.name;
+		throw new Error("Error " + f.error + " opening " + f.name);
 	var obj = {};
 	obj.event = read_sections(f, "event:");
 	obj.editor = read_sections(f, "editor:");
@@ -48,7 +64,7 @@ function read_xtrn_ini(filename)
 			var seccode = item.code.substring(0, i);
 			var secnum = find_xtrn_sec(obj, seccode);
 			if(secnum < 0)
-				throw "Invalid xtrn prog sec name: " + seccode;
+				throw new Error("Invalid xtrn prog sec name: " + seccode);
 			item.sec = secnum;
 			item.code = item.code.substring(i + 1);
 		}
@@ -72,12 +88,12 @@ function write_xtrn_ini(filename, obj)
 	file_backup(filename, backup_level);
 	var f = new File(filename);
 	if(!f.open(f.exists ? 'r+' : 'w+'))
-		throw "Error " + f.error + " opening/creating " + f.name;
+		throw new Error("Error " + f.error + " opening/creating " + f.name);
 	
 	for(var i = 0; obj.prog && i < obj.prog.length; i++) {
 		var item = obj.prog[i];
 		if(obj.sec[item.sec] === undefined)
-			throw "Invalid section number: " + item.sec;
+			throw new Error("Invalid section number: " + item.sec);
 		item.code = obj.sec[item.sec].code + ":" + item.code;
 	}
 	write_sections(f, obj.event, "event:");
@@ -88,47 +104,42 @@ function write_xtrn_ini(filename, obj)
 	return true;
 }
 
-function read_chat_ini(filename)
-{
-}
-
 function read(filename, struct)
 {
 	if(struct)
-		throw "struct argument not supported";
+		throw new Error("struct argument not supported");
 	switch(file_getname(filename)) {
 		case "main.ini":
 			return read_main_ini(filename);
 		case "msgs.ini":
-			return read_msgs_ini(filename);
+			throw new Error("reading msgs.ini not yet supported");
 		case "file.ini":
 			return read_file_ini(filename);
 		case "xtrn.ini":
 			return read_xtrn_ini(filename);
 		case "chat.ini":
-			return read_chat_ini(filename);
+			throw new Error("reading chat.ini not yet supported");
 	}
-	throw "unsupported filename: " + filename;
+	throw new Error("unsupported filename: " + filename);
 }
 
 function write(filename, struct, obj)
 {
 	if(struct)
-		throw "struct argument not supported";
+		throw new Error("struct argument not supported");
 	switch(file_getname(filename)) {
 		case "main.ini":
-			return write_main_ini(filename, obj);
+			throw new Error("writing main.ini not yet supported");
 		case "msgs.ini":
-			return write_msgs_ini(filename, obj);
+			throw new Error("writing msgs.ini not yet supported");
 		case "file.ini":
-			return write_file_ini(filename, obj);
+			throw new Error("writing file.ini not yet supported");
 		case "xtrn.ini":
 			return write_xtrn_ini(filename, obj);
 		case "chat.ini":
-			return write_chat_ini(filename, obj);
+			throw new Error("writing chat.ini not yet supported");
 	}
-	throw "unsupported filename: " + filename;
-	
+	throw new Error("unsupported filename: " + filename);
 }
 
 this;