Intercept escape key before passing keyboard input to splash plugin

We want to pass escape to the layer that created the boot splash, so
that it can tear down the curren splash plugin and put up the
details view

src/main.c

@@ -150,7 +150,7 @@ start_boot_splash (state_t    *state,
 
   ply_trace ("Loading boot splash plugin '%s'",
              module_path);
-  splash = ply_boot_splash_new (module_path);
+  splash = ply_boot_splash_new (module_path, NULL, NULL);
 
   ply_trace ("attaching plugin to event loop");
   ply_boot_splash_attach_to_event_loop (splash, state->loop);

src/ply-boot-splash.c

@@ -30,6 +30,7 @@
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <wchar.h>
 
 #include "ply-boot-splash-plugin.h"
 #include "ply-event-loop.h"
@@ -37,6 +38,8 @@
 #include "ply-logger.h"
 #include "ply-utils.h"
 
+#define KEY_ESCAPE '\033'
+
 struct _ply_boot_splash
 {
   ply_event_loop_t *loop;
@@ -45,6 +48,9 @@ struct _ply_boot_splash
   ply_boot_splash_plugin_t *plugin;
   ply_window_t *window;
 
+  ply_boot_splash_escape_handler_t escape_handler;
+  void *escape_handler_user_data;
+
   char *module_name;
   char *status;
 
@@ -55,7 +61,9 @@ typedef const ply_boot_splash_plugin_interface_t *
         (* get_plugin_interface_function_t) (void);
 
 ply_boot_splash_t *
-ply_boot_splash_new (const char *module_name)
+ply_boot_splash_new (const char *module_name,
+                     ply_boot_splash_escape_handler_t escape_handler,
+                     void *user_data)
 {
   ply_boot_splash_t *splash;
 
@@ -67,6 +75,9 @@ ply_boot_splash_new (const char *module_name)
   splash->module_handle = NULL;
   splash->is_shown = false;
 
+  splash->escape_handler = escape_handler;
+  splash->escape_handler_user_data = user_data;
+
   return splash;
 }
 
@@ -143,12 +154,36 @@ ply_boot_splash_unload_plugin (ply_boot_splash_t *splash)
   splash->module_handle = NULL;
 }
 
+static bool
+ply_boot_splash_process_keyboard_input (ply_boot_splash_t *splash,
+                                        const char        *keyboard_input)
+{
+  wchar_t key;
+
+  if (mbrtowc (&key, keyboard_input, 1, NULL) > 0)
+    {
+      if (key == KEY_ESCAPE)
+        {
+          if (splash->escape_handler != NULL)
+            splash->escape_handler (splash->escape_handler_user_data);
+
+          return true;
+        }
+    }
+
+  return false;
+}
+
 static void
 on_keyboard_input (ply_boot_splash_t *splash,
-                   const char        *key)
+                   const char        *keyboard_input)
 {
+
+  if (ply_boot_splash_process_keyboard_input (splash, keyboard_input))
+    return;
+
   if (splash->plugin_interface->on_keyboard_input != NULL)
-    splash->plugin_interface->on_keyboard_input (splash->plugin, key);
+    splash->plugin_interface->on_keyboard_input (splash->plugin, keyboard_input);
 }
 
 static bool
@@ -158,6 +193,8 @@ ply_boot_splash_create_window (ply_boot_splash_t *splash)
                                    (ply_window_keyboard_input_handler_t)
                                    on_keyboard_input, splash);
 
+  ply_window_attach_to_event_loop (splash->window, splash->loop);
+
   if (!ply_window_open (splash->window))
     {
       ply_save_errno ();
@@ -313,7 +350,7 @@ main (int    argc,
   else
     module_name = "../splash-plugins/fedora-fade-in/.libs/fedora-fade-in.so";
 
-  splash = ply_boot_splash_new (module_name);
+  splash = ply_boot_splash_new (module_name, NULL, NULL);
   ply_boot_splash_attach_to_event_loop (splash, loop);
 
   if (!ply_boot_splash_show (splash))

src/ply-boot-splash.h

@@ -30,8 +30,13 @@
 
 typedef struct _ply_boot_splash ply_boot_splash_t;
 
+typedef void (* ply_boot_splash_escape_handler_t) (void *user_data);
+
+
 #ifndef PLY_HIDE_FUNCTION_DECLARATIONS
-ply_boot_splash_t *ply_boot_splash_new (const char *module_name);
+ply_boot_splash_t *ply_boot_splash_new (const char *module_name,
+                                        ply_boot_splash_escape_handler_t escape_handler,
+                                        void *user_data);
 void ply_boot_splash_free (ply_boot_splash_t *splash);
 bool ply_boot_splash_show (ply_boot_splash_t *splash);
 void ply_boot_splash_update_status (ply_boot_splash_t *splash,