X11App: Add prestartup() method

prestartup() is called before initializing X11. Use this in Xmoji to
load the runtime config and check for single instance as early as
possible.

src/bin/xmoji/x11app.c

@@ -21,7 +21,7 @@
 static void destroy(void *obj);
 
 static X11App *instance;
-static MetaX11App mo = MetaX11App_init(0, 0, "X11App", destroy);
+static MetaX11App mo = MetaX11App_init(0, 0, 0, "X11App", destroy);
 
 typedef struct AppLocale
 {
@@ -58,21 +58,34 @@ struct X11Error
 
 static void svprestartup(void *receiver, void *sender, void *args)
 {
-    (void)receiver;
     (void)sender;
 
+    X11App *self = receiver;
     PSC_Service_setTickInterval(0);
     PSC_EAStartup *ea = args;
-    PSC_EAStartup_return(ea, X11Adapter_init(instance->argc, instance->argv,
+    int rc = 0;
+    Object_vcall(rc, X11App, prestartup, instance);
+    if (rc == EXIT_FAILURE) PSC_EAStartup_return(ea, EXIT_FAILURE);
+    else if (rc != 0) self->quitting = 1;
+    else PSC_EAStartup_return(ea,
+	    X11Adapter_init(instance->argc, instance->argv,
 		instance->locale.lc_ctype, instance->name,
-		Object_className(instance)) ? EXIT_FAILURE : EXIT_SUCCESS);
+		Object_className(instance))
+	    ? EXIT_FAILURE : EXIT_SUCCESS);
 }
 
 static void svstartup(void *receiver, void *sender, void *args)
 {
-    (void)receiver;
     (void)sender;
 
+    X11App *self = receiver;
+    if (self->quitting)
+    {
+	self->quitting = 0;
+	PSC_Service_quit();
+	return;
+    }
+
 #ifndef DEBUG
     PSC_Log_setAsync(1);
 #endif

src/bin/xmoji/x11app.h

@@ -14,12 +14,14 @@ C_CLASS_DECL(X11App);
 typedef struct MetaX11App
 {
     MetaObject base;
+    int (*prestartup)(void *app);
     int (*startup)(void *app);
     void (*shutdown)(void *app);
 } MetaX11App;
 
-#define MetaX11App_init(mstartup, mshutdown, ...) { \
+#define MetaX11App_init(mprestartup, mstartup, mshutdown, ...) { \
     .base = MetaObject_init(__VA_ARGS__), \
+    .prestartup = mprestartup, \
     .startup = mstartup, \
     .shutdown = mshutdown, \
 }

src/bin/xmoji/xmoji.c

@@ -36,10 +36,12 @@
 #define MAXSEARCHRESULTS 100
 #define SEARCHRESULTSZ 1024
 
+static int prestartup(void *app);
 static int startup(void *app);
 static void destroy(void *app);
 
-static MetaX11App mo = MetaX11App_init(startup, 0, "Xmoji", destroy);
+static MetaX11App mo = MetaX11App_init(prestartup, startup, 0,
+	"Xmoji", destroy);
 
 typedef struct Xmoji
 {
@@ -405,7 +407,7 @@ static void onsearchmodeboxchanged(void *receiver, void *sender, void *args)
     Config_setEmojiSearchMode(self->config, *val + (*val > 2) + 1);
 }
 
-static int startup(void *app)
+static int prestartup(void *app)
 {
     Xmoji *self = Object_instance(app);
 
@@ -428,15 +430,27 @@ static int startup(void *app)
     PSC_Event_register(SingleInstance_secondary(self->instance), self,
 	    onsecondary, 0);
     if (Config_singleInstance(self->config)
-	    && !SingleInstance_start(self->instance)) return -1;
+	    && !SingleInstance_start(self->instance))
+    {
+	PSC_Log_setMaxLogLevel(PSC_L_INFO);
+	PSC_Log_msg(PSC_L_INFO, "Found running instance, quitting.");
+	return -1;
+    }
 
     /* Load translations */
-    Translator *tr = Translator_create("xmoji-ui",
+    self->uitexts = Translator_create("xmoji-ui",
 	    X11App_lcMessages(), XMU_get);
-    self->uitexts = tr;
-    Translator *etr = Translator_create("xmoji-emojis",
+    self->emojitexts = Translator_create("xmoji-emojis",
 	    X11App_lcMessages(), XME_get);
-    self->emojitexts = etr;
+
+    return 0;
+}
+
+static int startup(void *app)
+{
+    Xmoji *self = Object_instance(app);
+    Translator *tr = self->uitexts;
+    Translator *etr = self->emojitexts;
 
     /* Initialize commands */
     Command *aboutCommand = Command_create(