made alias names posix compilant and added global aliases

src/Alias.js

@@ -1,5 +1,6 @@
 /* Alias.js */
 Aliases = {};
+GlobalAliases = {};
 
 //Print all aliases to terminal
 function printAliases() {
@@ -8,21 +9,40 @@ function printAliases() {
             post("alias " + name + "=" + Aliases[name]);
         }
     }
+    for (var name in GlobalAliases) {
+        if (GlobalAliases.hasOwnProperty(name)) {
+            post("global alias " + name + "=" + GlobalAliases[name]);
+        }
+    }
 }
 
 //True if successful, false otherwise
-function parseAliasDeclaration(dec) {
-    var re = /([^=]+)="(.+)"/;
+function parseAliasDeclaration(dec,global=false) {
+    var re = /^([_|\w|!|%|,|@]+)="(.+)"$/;
     var matches = dec.match(re);
     if (matches == null || matches.length != 3) {return false;}
-    addAlias(matches[1], matches[2]);
+    if (global){
+        addGlobalAlias(matches[1],matches[2]);
+    } else {
+        addAlias(matches[1], matches[2]);
+    }
     return true;
 }
 
 function addAlias(name, value) {
+    if (name in GlobalAliases){
+        delete GlobalAliases[name];
+    }
     Aliases[name] = value;
 }
 
+function addGlobalAlias(name, value) {
+    if (name in Aliases){
+        delete Aliases[name];
+    }
+    GlobalAliases[name] = value;
+}
+
 function getAlias(name) {
     if (Aliases.hasOwnProperty(name)) {
         return Aliases[name];
@@ -30,6 +50,13 @@ function getAlias(name) {
     return null;
 }
 
+function getGlobalAlias(name) {
+    if (GlobalAliases.hasOwnProperty(name)) {
+        return GlobalAliases[name];
+    }
+    return null;
+}
+
 function removeAlias(name) {
     if (Aliases.hasOwnProperty(name)) {
         delete Aliases[name];
@@ -42,10 +69,21 @@ function removeAlias(name) {
 //Aliases only applied to "whole words", one level deep
 function substituteAliases(origCommand) {
     var commandArray = origCommand.split(" ");
-    for (var i = 0; i < commandArray.length; ++i) {
-        var alias = getAlias(commandArray[i]);
+    if (commandArray.length>0){
+        var alias = getAlias(commandArray[0]);
         if (alias != null) {
-            commandArray[i] = alias;
+            commandArray[0] = alias;
+        } else {
+            var alias = getGlobalAlias(commandArray[0]);
+            if (alias != null) {
+                commandArray[0] = alias;
+            }
+        }
+        for (var i = 0; i < commandArray.length; ++i) {
+            var alias = getGlobalAlias(commandArray[i]);
+            if (alias != null) {
+                commandArray[i] = alias;
+            }
         }
     }
     return commandArray.join(" ");