[gnome-games/wip/aplazas/781572-remove-vala-macro: 1/13] gamepad: Port LinuxRawGamepadMonitor to C

[Adrien Plazas <aplazas src gnome org>]

commit 976ea1bfc13655a7376fc2a2325e4c94e759fb9c
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Apr 23 15:25:42 2017 +0200

    gamepad: Port LinuxRawGamepadMonitor to C
    
    This will help to port part of the gamepad handling to C to avoid using
    the Vala preprocessor.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781572

 src/Makefile.am                                  |   12 +-
 src/gamepad/linux/linux-raw-gamepad-monitor.c    |  267 ++++++++++++++++++++++
 src/gamepad/linux/linux-raw-gamepad-monitor.h    |   19 ++
 src/gamepad/linux/linux-raw-gamepad-monitor.vala |  103 ---------
 src/gamepad/linux/linux-raw-gamepad-monitor.vapi |    6 +
 5 files changed, 302 insertions(+), 105 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 859cb8f..12a4eba 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -25,6 +25,7 @@ EXTRA_DIST = \
        $(gresource_file) \
        gamepad/linux/libevdev.vapi \
        gamepad/linux/linux-raw-gamepad.vapi \
+       gamepad/linux/linux-raw-gamepad-monitor.vapi \
        gamepad/raw-gamepad.vapi \
        gamepad/raw-gamepad-monitor.vapi \
        gamepad/standard-gamepad-axis.vapi \
@@ -162,7 +163,7 @@ gnome_games_SOURCES += \
 
 if ENABLE_UDEV
 gnome_games_SOURCES += \
-       gamepad/linux/linux-raw-gamepad-monitor.vala \
+       gamepad/linux/linux-raw-gamepad-monitor.c \
        $(NULL)
 else
 gnome_games_SOURCES += \
@@ -198,7 +199,8 @@ gnome_games_VALAFLAGS += \
        --vapidir=gamepad/linux/ \
        --pkg libevdev \
        --pkg linux-raw-gamepad \
-       --define ENABLE_LINUX_GAMEPADS
+       --pkg linux-raw-gamepad-monitor \
+       --define ENABLE_LINUX_GAMEPADS \
        $(NULL)
 endif
 
@@ -229,6 +231,12 @@ gnome_games_CPPFLAGS += \
        $(NULL)
 endif
 
+if ENABLE_UDEV
+gnome_games_CPPFLAGS += \
+       -DENABLE_UDEV \
+       $(NULL)
+endif
+
 gnome_games_LDADD = \
        $(GNOME_GAMES_LIBS) \
        $(GAMEPADS_LIBS) \
diff --git a/src/gamepad/linux/linux-raw-gamepad-monitor.c b/src/gamepad/linux/linux-raw-gamepad-monitor.c
new file mode 100644
index 0000000..a38a706
--- /dev/null
+++ b/src/gamepad/linux/linux-raw-gamepad-monitor.c
@@ -0,0 +1,267 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+#include "linux-raw-gamepad-monitor.h"
+
+#include <gudev/gudev.h>
+#include "linux-raw-gamepad.h"
+#include "../raw-gamepad-monitor.h"
+
+struct _GamesLinuxRawGamepadMonitor {
+  GObject parent_instance;
+
+  GUdevClient *client;
+  GHashTable *raw_gamepads;
+};
+
+static void games_raw_gamepad_monitor_interface_init (GamesRawGamepadMonitorInterface *interface);
+
+G_DEFINE_TYPE_WITH_CODE (GamesLinuxRawGamepadMonitor, games_linux_raw_gamepad_monitor, G_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (GAMES_TYPE_RAW_GAMEPAD_MONITOR,
+                                                games_raw_gamepad_monitor_interface_init))
+
+typedef struct {
+  GamesRawGamepadCallback callback;
+  gpointer target;
+} ForeachGamepadData;
+
+/* Private */
+
+static void
+foreach_gamepad_do (gpointer key,
+                    gpointer value,
+                    gpointer data)
+{
+  ForeachGamepadData *callback_data;
+  GamesRawGamepad *raw_gamepad;
+
+  callback_data = (ForeachGamepadData *) data;
+  raw_gamepad = (GamesRawGamepad *) value;
+
+  g_return_if_fail (raw_gamepad != NULL);
+
+  callback_data->callback (raw_gamepad, callback_data->target);
+}
+
+static void
+foreach_gamepad (GamesRawGamepadMonitor  *base,
+                 GamesRawGamepadCallback  callback,
+                 gpointer                 target)
+{
+  GamesLinuxRawGamepadMonitor *self;
+  ForeachGamepadData data;
+
+  self = GAMES_LINUX_RAW_GAMEPAD_MONITOR (base);
+
+  g_return_if_fail (base != NULL);
+  g_return_if_fail (callback != NULL);
+
+  data.callback = callback;
+  data.target = target;
+  g_hash_table_foreach (self->raw_gamepads, foreach_gamepad_do, &data);
+}
+
+static GamesRawGamepad *
+add_gamepad (GamesLinuxRawGamepadMonitor *self,
+             GUdevDevice                 *device)
+{
+  gchar *identifier;
+  GamesLinuxRawGamepad *raw_gamepad;
+  GError *error = NULL;
+
+  g_return_val_if_fail (self != NULL, NULL);
+  g_return_val_if_fail (device != NULL, NULL);
+
+  identifier = g_strdup (g_udev_device_get_device_file (device));
+  if (g_hash_table_contains (self->raw_gamepads, identifier)) {
+    g_free (identifier);
+
+    return NULL;
+  }
+
+  raw_gamepad = games_linux_raw_gamepad_new (identifier, &error);
+  if (G_UNLIKELY (error != NULL)) {
+    g_free (identifier);
+    g_assert (raw_gamepad == NULL);
+    g_debug ("%s", error->message);
+    g_error_free (error);
+
+    return NULL;
+  }
+
+  g_assert (raw_gamepad != NULL);
+
+  g_hash_table_insert (self->raw_gamepads,
+                       identifier,
+                       g_object_ref (raw_gamepad));
+
+  return GAMES_RAW_GAMEPAD (raw_gamepad);
+}
+
+static GamesRawGamepad *
+remove_gamepad (GamesLinuxRawGamepadMonitor *self,
+                GUdevDevice                 *device)
+{
+  const gchar *identifier;
+  GamesRawGamepad *raw_gamepad;
+
+  g_return_val_if_fail (self != NULL, NULL);
+  g_return_val_if_fail (device != NULL, NULL);
+
+  identifier = g_udev_device_get_device_file (device);
+  if (!g_hash_table_contains (self->raw_gamepads, identifier))
+    return NULL;
+
+  raw_gamepad = g_object_ref (GAMES_RAW_GAMEPAD (g_hash_table_lookup (self->raw_gamepads, identifier)));
+  g_hash_table_remove (self->raw_gamepads, identifier);
+
+  return raw_gamepad;
+}
+
+static gboolean
+device_property_is (GUdevDevice *device,
+                    const gchar *property,
+                    const gchar *value)
+{
+  return g_udev_device_has_property (device, property) &&
+         (g_strcmp0 (g_udev_device_get_property (device, property), value) == 0);
+}
+
+static gboolean
+is_gamepad (GUdevDevice *device)
+{
+  g_return_val_if_fail (device != NULL, FALSE);
+
+  return device_property_is (device, "ID_INPUT_JOYSTICK", "1") ||
+         device_property_is (device, ".INPUT_CLASS", "joystick");
+}
+
+static void
+handle_udev_client_callback (GUdevClient *sender,
+                             const gchar *action,
+                             GUdevDevice *device,
+                             gpointer     data)
+{
+  GamesLinuxRawGamepadMonitor *self;
+
+  self = GAMES_LINUX_RAW_GAMEPAD_MONITOR (data);
+
+  g_return_if_fail (self != NULL);
+  g_return_if_fail (action != NULL);
+  g_return_if_fail (device != NULL);
+
+  if (g_udev_device_get_device_file (device) == NULL)
+    return;
+
+  if (!is_gamepad (device))
+    return;
+
+  if (g_strcmp0 (action, "add") == 0) {
+    GamesRawGamepad *raw_gamepad;
+
+    raw_gamepad = add_gamepad (self, device);
+    if (raw_gamepad != NULL) {
+      g_signal_emit_by_name (GAMES_RAW_GAMEPAD_MONITOR (self), "gamepad-plugged", raw_gamepad);
+      g_object_unref (raw_gamepad);
+    }
+  }
+  else if (g_strcmp0 (action, "remove") == 0) {
+    GamesRawGamepad *raw_gamepad;
+
+    raw_gamepad = remove_gamepad (self, device);
+    if (raw_gamepad != NULL) {
+      g_signal_emit_by_name (raw_gamepad, "unplugged");
+      g_object_unref (raw_gamepad);
+    }
+  }
+}
+
+static GamesLinuxRawGamepadMonitor *
+games_linux_raw_gamepad_monitor_new (void)
+{
+  static const gchar *subsystems[] = { "input" };
+  GamesLinuxRawGamepadMonitor *self = NULL;
+  GList *initial_devices_list;
+  GList *device_it = NULL;
+  GUdevDevice *device = NULL;
+  GamesRawGamepad *gamepad;
+
+  self = g_object_new (GAMES_TYPE_LINUX_RAW_GAMEPAD_MONITOR, NULL);
+  self->client = g_udev_client_new (subsystems);
+  g_signal_connect_object (self->client,
+                           "uevent",
+                           (GCallback) handle_udev_client_callback,
+                           self,
+                           0);
+  self->raw_gamepads = g_hash_table_new_full (g_str_hash,
+                                              g_str_equal,
+                                              g_free,
+                                              g_object_unref);
+  initial_devices_list = g_udev_client_query_by_subsystem (self->client,
+                                                           "input");
+
+  for (device_it = initial_devices_list;
+       device_it != NULL;
+       device_it = device_it->next) {
+    device = G_UDEV_DEVICE (device_it->data);
+    if (g_udev_device_get_device_file (device) == NULL)
+      continue;
+
+    if (!is_gamepad (device))
+      continue;
+
+    gamepad = add_gamepad (self, device);
+    if (gamepad != NULL)
+      g_object_unref (gamepad);
+  }
+
+  g_list_free_full (initial_devices_list, g_object_unref);
+
+  return self;
+}
+
+/* Public */
+
+GamesLinuxRawGamepadMonitor *
+games_linux_raw_gamepad_monitor_get_instance (void)
+{
+  static GamesLinuxRawGamepadMonitor *instance = NULL;
+
+  if (instance == NULL)
+    instance = games_linux_raw_gamepad_monitor_new ();
+
+  return g_object_ref (instance);
+}
+
+/* Type */
+
+static void
+games_linux_raw_gamepad_monitor_finalize (GObject *object)
+{
+  GamesLinuxRawGamepadMonitor *self = GAMES_LINUX_RAW_GAMEPAD_MONITOR (object);
+
+  if (self->client != NULL)
+    g_object_unref (self->client);
+  if (self->raw_gamepads != NULL)
+    g_hash_table_unref (self->raw_gamepads);
+
+  G_OBJECT_CLASS (games_linux_raw_gamepad_monitor_parent_class)->finalize (object);
+}
+
+static void
+games_linux_raw_gamepad_monitor_class_init (GamesLinuxRawGamepadMonitorClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->finalize = games_linux_raw_gamepad_monitor_finalize;
+}
+
+static void
+games_raw_gamepad_monitor_interface_init (GamesRawGamepadMonitorInterface *interface)
+{
+  interface->foreach_gamepad = foreach_gamepad;
+}
+
+static void
+games_linux_raw_gamepad_monitor_init (GamesLinuxRawGamepadMonitor *self)
+{
+}
diff --git a/src/gamepad/linux/linux-raw-gamepad-monitor.h b/src/gamepad/linux/linux-raw-gamepad-monitor.h
new file mode 100644
index 0000000..4ac408a
--- /dev/null
+++ b/src/gamepad/linux/linux-raw-gamepad-monitor.h
@@ -0,0 +1,19 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+#ifndef GAMES_LINUX_RAW_GAMEPAD_MONITOR_H
+#define GAMES_LINUX_RAW_GAMEPAD_MONITOR_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define GAMES_TYPE_LINUX_RAW_GAMEPAD_MONITOR (games_linux_raw_gamepad_monitor_get_type())
+
+G_DECLARE_FINAL_TYPE (GamesLinuxRawGamepadMonitor, games_linux_raw_gamepad_monitor, GAMES, 
LINUX_RAW_GAMEPAD_MONITOR, GObject)
+
+GamesLinuxRawGamepadMonitor *games_linux_raw_gamepad_monitor_get_instance (void);
+
+G_END_DECLS
+
+#endif /* GAMES_LINUX_RAW_GAMEPAD_MONITOR_H */
+
diff --git a/src/gamepad/linux/linux-raw-gamepad-monitor.vapi 
b/src/gamepad/linux/linux-raw-gamepad-monitor.vapi
new file mode 100644
index 0000000..e33d4e0
--- /dev/null
+++ b/src/gamepad/linux/linux-raw-gamepad-monitor.vapi
@@ -0,0 +1,6 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+[CCode (cheader_filename = "linux-raw-gamepad-monitor.h")]
+private class Games.LinuxRawGamepadMonitor : GLib.Object, RawGamepadMonitor {
+       public static LinuxRawGamepadMonitor get_instance ();
+}