Profile-bound custom commands now execute

Rather than starting ksession right away, PreprocessedTerminal now waits
for ApplicationSettings to finish loading custom command settings from
storage. If a custom command is specified, PreprocessedTerminal will
tokenize it and pass it onto ksession as a shell program similar to the
-e option. If both a -e command and a custom command is specified, the
-e version overrides the custom command.

app/qml/ApplicationSettings.qml

@@ -97,6 +97,8 @@ QtObject{
 
     signal terminalFontChanged(string fontSource, int pixelSize, int lineSpacing, real screenScaling, real fontWidth)
 
+    signal initializedSettings()
+
     property Loader fontManager: Loader{
         states: [
             State { when: rasterization == no_rasterization
@@ -463,6 +465,8 @@ QtObject{
             fullscreen = true;
             showMenubar = false;
         }
+
+        initializedSettings();
     }
     Component.onDestruction: {
         storeSettings();

app/qml/PreprocessedTerminal.qml

@@ -129,13 +129,17 @@ Item{
 
             kterminal.lineSpacing = lineSpacing;
         }
-        Component.onCompleted: {
-            appSettings.terminalFontChanged.connect(handleFontChange);
+        function startSession() {
+            appSettings.initializedSettings.disconnect(startSession);
 
             // Retrieve the variable set in main.cpp if arguments are passed.
             if (defaultCmd) {
                 ksession.setShellProgram(defaultCmd);
                 ksession.setArgs(defaultCmdArgs);
+            } else if (appSettings.useCustomCommand) {
+                var args = Utils.tokenizeCommandLine(appSettings.customCommand);
+                ksession.setShellProgram(args[0]);
+                ksession.setArgs(args.slice(1));
             } else if (!defaultCmd && Qt.platform.os === "osx") {
                 // OSX Requires the following default parameters for auto login.
                 ksession.setArgs(["-i", "-l"]);
@@ -147,6 +151,10 @@ Item{
             ksession.startShellProgram();
             forceActiveFocus();
         }
+        Component.onCompleted: {
+            appSettings.terminalFontChanged.connect(handleFontChange);
+            appSettings.initializedSettings.connect(startSession);
+        }
     }
     Component {
         id: linuxContextMenu

app/qml/utils.js

@@ -21,3 +21,74 @@ function strToColor(s){
     var b = parseInt(s.substring(5,7), 16) / 256;
     return Qt.rgba(r, g, b, 1.0);
 }
+
+/* Tokenizes a command into program and arguments, taking into account quoted
+ * strings and backslashes.
+ * Based on GLib's tokenizer, used by Gnome Terminal
+ */
+function tokenizeCommandLine(s){
+    var args = [];
+    var currentToken = "";
+    var quoteChar = "";
+    var escaped = false;
+    var nextToken = function() {
+        args.push(currentToken);
+        currentToken = "";
+    }
+    var appendToCurrentToken = function(c) {
+        currentToken += c;
+    }
+
+    for (var i = 0; i < s.length; i++) {
+
+        // char followed by backslash, append literally
+        if (escaped) {
+            escaped = false;
+            appendToCurrentToken(s[i]);
+
+        // char inside quotes, either close or append
+        } else if (quoteChar) {
+            escaped = s[i] === '\\';
+            if (quoteChar === s[i]) {
+                quoteChar = "";
+                nextToken();
+            } else if (!escaped) {
+                appendToCurrentToken(s[i]);
+            }
+
+        // regular char
+        } else {
+            escaped = s[i] === '\\';
+            switch (s[i]) {
+            case '\\':
+                // begin escape
+                break;
+            case '\n':
+                // newlines always delimits
+                nextToken();
+                break;
+            case ' ':
+            case '\t':
+                // delimit on new whitespace
+                if (currentToken) {
+                    nextToken();
+                }
+                break;
+            case '\'':
+            case '"':
+                // begin quoted section
+                quoteChar = s[i];
+                break;
+            default:
+                appendToCurrentToken(s[i]);
+            }
+        }
+    }
+
+    // ignore last token if broken quotes/backslash
+    if (currentToken && !escaped && !quoteChar) {
+        nextToken();
+    }
+
+    return args;
+}