Add watcher for .show file in config directory

Draw attention when the .show file is created.
It is created when attempting to open another
instance of Mirage with the same configuration.

src/gui/Window.qml

@@ -3,6 +3,7 @@
 import QtQuick 2.12
 import QtQuick.Controls 2.12
 import Qt.labs.platform 1.1
+import Qt.labs.folderlistmodel 2.12
 import "Base"
 import "PythonBridge"
 
@@ -23,7 +24,7 @@ ApplicationWindow {
     property var uiState: ({})
     property var history: ({})
     property var theme: null
-    property bool closing: false
+    property string configDir
 
     readonly property var visibleMenus: ({})
     readonly property var visiblePopups: ({})
@@ -142,4 +143,21 @@ ApplicationWindow {
             }
         }
     }
+
+    FolderListModel {
+        id: showUpWatcher
+        folder: window.configDir
+        showDirs: false
+        showHidden: true
+        nameFilters: [".show"]
+
+        onCountChanged: {
+            if (count) {
+                window.drawAttention()
+                py.importModule("os", () => {
+                    py.call("os.remove", [get(0, "filePath")])
+                })
+            }
+        }
+    }
 }

src/main.cpp

@@ -93,14 +93,9 @@ void onExitSignal(int signum) {
 }
 
 
-bool setLockFile() {
+bool setLockFile(QString configPath) {
-    QString customConfigDir(qEnvironmentVariable("MIRAGE_CONFIG_DIR"));
+
-    QDir configDir(
+    QDir configDir(configPath);
-        customConfigDir.isEmpty() ?
-        QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation)
-        + "/" + QCoreApplication::applicationName() :
-        customConfigDir
-    );
 
     if (! configDir.mkpath(".")) {
         qFatal("Could not create config file.");
@@ -139,7 +134,15 @@ int main(int argc, char *argv[]) {
     QApplication::setApplicationVersion("0.6.2");
     QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 
-    if (! setLockFile()) return EXIT_SUCCESS;
+    QString customConfigDir(qEnvironmentVariable("MIRAGE_CONFIG_DIR"));
+    QString configDir(
+        customConfigDir.isEmpty() ?
+        QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation)
+        + "/" + QCoreApplication::applicationName() :
+        customConfigDir
+    );
+
+    if (! setLockFile(configDir)) return EXIT_SUCCESS;
     QApplication app(argc, argv);
 
     // Register handlers for quit signals, e.g. SIGINT/Ctrl-C in unix terminals
@@ -243,7 +246,7 @@ int main(int argc, char *argv[]) {
         app.exit(EXIT_FAILURE);
     }
 
-    component.create(objectContext);
+    component.create(objectContext)->setProperty("configDir", configDir);
 
     // Finally, execute the app. Return its exit code after clearing the lock.
     int exit_code = app.exec();