Implement `cd` command to enable changing _MetaTerm_'s working directory

Exposing access to the working directory to QML is the first step towards enabling usage analogously to a normal terminal emulator alongside the management of multiple running appications.
i.e. executing `cd` should change the global working directory so that consecutive commands work as expected.

2 files changed, 38 insertions, 2 deletions

diff --git a/main.cc b/main.cc
index 617b43a..a27ab6c 100644
--- a/main.cc
+++ b/main.cc
@@ -1,12 +1,36 @@
+#include <QDir>
+#include <QQmlContext>
 #include <QApplication>
 #include <QQmlApplicationEngine>
 
+class WorkingDirectory : public QObject {
+	Q_OBJECT
+
+	public:
+		Q_INVOKABLE bool cd(const QString& path) const {
+			QDir current(QDir::current());
+
+			const bool result = current.cd(path);
+
+			QDir::setCurrent(current.absolutePath());
+
+			return result;
+		}
+
+		Q_INVOKABLE QString current() const {
+			return QDir::current().absolutePath();
+		}
+};
+
 int main(int argc, char *argv[]) {
-	QApplication application(argc, argv);
+	WorkingDirectory      directory;
+	QApplication          application(argc, argv);
+	QQmlApplicationEngine engine(QUrl(QStringLiteral("qrc:/main.qml")));
+
 	application.setOrganizationName("akr");
 	application.setApplicationName("MetaTerm");
 
-	QQmlApplicationEngine engine(QUrl(QStringLiteral("qrc:/main.qml")));
+	engine.rootContext()->setContextProperty("workingDirectory", &directory);
 
 	QObject::connect(
 		static_cast<QObject*>(&engine),
@@ -17,3 +41,5 @@ int main(int argc, char *argv[]) {
 
 	return application.exec();
 }
+
+#include "main.moc"
diff --git a/src/command/commands.js b/src/command/commands.js
index 732eb5b..2ec1bb6 100644
--- a/src/command/commands.js
+++ b/src/command/commands.js
@@ -114,3 +114,13 @@ function prev() {
 function q() {
 	Qt.quit();
 }
+
+function cd(output, path) {
+	if ( path.length > 0 ) {
+		if ( !workingDirectory.cd(path) ) {
+			output.error('\"' + path + '\" doesn\'t exist.');
+		}
+	} else {
+		output.log(workingDirectory.current());
+	}
+}