[gnome-games/wip/aplazas/781572-remove-vala-macro: 1/3] gamepad: Port GamepadMappingsManager to C

[Adrien Plazas <aplazas src gnome org>]

commit 73487e33c4f8a0470cd1fb26aa9961f00e42d890
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Sun Apr 30 09:21:02 2017 +0200

    gamepad: Port GamepadMappingsManager to C
    
    This will help to port part of the gamepad handling to C to avoid using
    the Vala preprocessor.

 src/Makefile.am                           |    4 +-
 src/gamepad/gamepad-mappings-manager.c    |  254 +++++++++++++++++++++++++++++
 src/gamepad/gamepad-mappings-manager.h    |   19 ++
 src/gamepad/gamepad-mappings-manager.vala |   85 ----------
 src/gamepad/gamepad-mappings-manager.vapi |    7 +
 5 files changed, 283 insertions(+), 86 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index 6cbc449..d9aa591 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -27,6 +27,7 @@ EXTRA_DIST = \
        gamepad/gamepad-mapped-event.vapi \
        gamepad/gamepad-mapping.vapi \
        gamepad/gamepad-mapping-error.vapi \
+       gamepad/gamepad-mappings-manager.vapi \
        gamepad/linux/linux-raw-gamepad-monitor.vapi \
        gamepad/raw-gamepad.vapi \
        gamepad/raw-gamepad-monitor.vapi \
@@ -81,7 +82,7 @@ gnome_games_SOURCES = \
        gamepad/gamepad-mapped-event.c \
        gamepad/gamepad-mapping.c \
        gamepad/gamepad-mapping-error.c \
-       gamepad/gamepad-mappings-manager.vala \
+       gamepad/gamepad-mappings-manager.c \
        gamepad/gamepad-monitor.vala \
        gamepad/raw-gamepad.c \
        gamepad/raw-gamepad-monitor.c \
@@ -190,6 +191,7 @@ gnome_games_VALAFLAGS = \
        --pkg gamepad-mapped-event \
        --pkg gamepad-mapping \
        --pkg gamepad-mapping-error \
+       --pkg gamepad-mappings-manager \
        --pkg raw-gamepad \
        --pkg raw-gamepad-monitor \
        --pkg standard-gamepad-axis \
diff --git a/src/gamepad/gamepad-mappings-manager.c b/src/gamepad/gamepad-mappings-manager.c
new file mode 100644
index 0000000..a43e95e
--- /dev/null
+++ b/src/gamepad/gamepad-mappings-manager.c
@@ -0,0 +1,254 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+#include "gamepad-mappings-manager.h"
+
+#include <glib.h>
+#include <glib-object.h>
+#include <stdlib.h>
+#include <string.h>
+#include <gio/gio.h>
+
+struct _GamesGamepadMappingsManager {
+  GObject parent_instance;
+
+  GHashTable *names;
+  GHashTable *mappings;
+};
+
+G_DEFINE_TYPE (GamesGamepadMappingsManager, games_gamepad_mappings_manager, G_TYPE_OBJECT);
+
+static GamesGamepadMappingsManager *instance = NULL;
+
+#define MAPPINGS_FILE_NAME "gamecontrollerdb.txt"
+
+// FIXME The gamepad module shouldn't have a hidden dependency on the
+// application.
+gchar *games_application_get_config_dir (void);
+
+/* Private */
+
+static void
+add_mapping (GamesGamepadMappingsManager *self,
+             const gchar                 *mapping_string)
+{
+  const gchar *platform;
+  gchar **split;
+
+  g_return_if_fail (self != NULL);
+  g_return_if_fail (mapping_string != NULL);
+
+  if (mapping_string[0] == '\0' || mapping_string[0] == '#')
+    return;
+
+  platform = g_strstr_len (mapping_string, -1, "platform");
+  if (platform != NULL && !g_str_has_prefix (platform, "platform:Linux"))
+    return;
+
+  split = g_strsplit (mapping_string, ",", 3);
+  g_hash_table_insert (self->names,
+                       g_strdup (split[0]),
+                       g_strdup (split[1]));
+  g_hash_table_insert (self->mappings,
+                       g_strdup (split[0]),
+                       g_strdup (split[2]));
+  g_strfreev (split);
+}
+
+static void
+add_from_input_stream (GamesGamepadMappingsManager  *self,
+                       GInputStream                 *input_stream,
+                       GError                      **error)
+{
+  GDataInputStream *data_stream;
+  gchar *mapping_string;
+  GError *inner_error = NULL;
+
+  g_return_if_fail (self != NULL);
+  g_return_if_fail (input_stream != NULL);
+
+  data_stream = g_data_input_stream_new (input_stream);
+  while (TRUE) {
+    mapping_string = g_data_input_stream_read_line (data_stream,
+                                                    NULL, NULL,
+                                                    &inner_error);
+    if (G_UNLIKELY (inner_error != NULL)) {
+      g_assert (mapping_string == NULL);
+      g_propagate_error (error, inner_error);
+      g_object_unref (data_stream);
+
+      return;
+    }
+
+    if (mapping_string == NULL)
+      break;
+
+    add_mapping (self, mapping_string);
+  }
+  g_object_unref (data_stream);
+}
+
+static void
+add_from_resource (GamesGamepadMappingsManager  *self,
+                   const gchar                  *path,
+                   GError                      **error)
+{
+  GInputStream *stream;
+  GError *inner_error = NULL;
+
+  g_return_if_fail (self != NULL);
+  g_return_if_fail (path != NULL);
+
+  stream = g_resources_open_stream (path,
+                                    G_RESOURCE_LOOKUP_FLAGS_NONE,
+                                    &inner_error);
+  if (G_UNLIKELY (inner_error != NULL)) {
+    g_propagate_error (error, inner_error);
+
+    return;
+  }
+
+  add_from_input_stream (self, G_INPUT_STREAM (stream), &inner_error);
+  if (G_UNLIKELY (inner_error != NULL)) {
+    g_propagate_error (error, inner_error);
+    g_object_unref (stream);
+
+    return;
+  }
+
+  g_object_unref (stream);
+}
+
+static void
+add_from_file (GamesGamepadMappingsManager  *self,
+               const gchar                  *file_name,
+               GError                      **error)
+{
+  GFile *file;
+  GFileInputStream *stream;
+  GError *inner_error = NULL;
+
+  g_return_if_fail (self != NULL);
+  g_return_if_fail (file_name != NULL);
+
+  file = g_file_new_for_path (file_name);
+  stream = g_file_read (file, NULL, &inner_error);
+  if (G_UNLIKELY (inner_error != NULL)) {
+    g_propagate_error (error, inner_error);
+    g_object_unref (file);
+
+    return;
+  }
+
+  add_from_input_stream (self, G_INPUT_STREAM (stream), &inner_error);
+  if (G_UNLIKELY (inner_error != NULL)) {
+    g_propagate_error (error, inner_error);
+    g_object_unref (stream);
+    g_object_unref (file);
+
+    return;
+  }
+
+  g_object_unref (stream);
+  g_object_unref (file);
+}
+
+static GamesGamepadMappingsManager *
+games_gamepad_mappings_manager_new (void)
+{
+  GamesGamepadMappingsManager *self = NULL;
+  gchar *dir;
+  gchar *path;
+  GError *inner_error = NULL;
+
+  self = (GamesGamepadMappingsManager*) g_object_new (GAMES_TYPE_GAMEPAD_MAPPINGS_MANAGER, NULL);
+
+  if (self->names == NULL)
+    self->names = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
+
+  if (self->mappings == NULL)
+    self->mappings = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);
+
+  add_from_resource (self,
+                     "/org/gnome/Games/gamepads/gamecontrollerdb.txt",
+                     &inner_error);
+  if (G_UNLIKELY (inner_error != NULL)) {
+    g_warning ("GamepadMappingsManager: Can’t find resource gamecontrollerdb.txt: %s",
+               inner_error->message);
+    g_clear_error (&inner_error);
+  }
+
+  // FIXME The gamepad module shouldn't have a hidden dependency on the
+  // application.
+  dir = games_application_get_config_dir ();
+  path = g_build_filename (dir, MAPPINGS_FILE_NAME, NULL);
+
+  g_free (dir);
+
+  if (!g_file_test (path, G_FILE_TEST_EXISTS)) {
+    g_free (path);
+
+    return self;
+  }
+
+  add_from_file (self, path, &inner_error);
+  if (G_UNLIKELY (inner_error != NULL)) {
+    g_warning ("GamepadMappingsManager: Can’t add from user’s config dir’s %s: %s",
+               MAPPINGS_FILE_NAME,
+               inner_error->message);
+    g_clear_error (&inner_error);
+  }
+
+  g_free (path);
+
+  return self;
+}
+
+/* Public */
+
+GamesGamepadMappingsManager *
+games_gamepad_mappings_manager_get_instance (void)
+{
+  if (instance == NULL)
+    instance = games_gamepad_mappings_manager_new ();
+
+  return g_object_ref (instance);
+}
+
+gchar *
+games_gamepad_mappings_manager_get_mapping (GamesGamepadMappingsManager *self,
+                                            const gchar                 *guid)
+{
+  const gchar *mapping;
+
+  g_return_val_if_fail (self != NULL, NULL);
+  g_return_val_if_fail (guid != NULL, NULL);
+
+  mapping = g_hash_table_lookup (self->mappings, guid);
+
+  return g_strdup (mapping);
+}
+
+/* Type */
+
+static void
+finalize (GObject *object)
+{
+  GamesGamepadMappingsManager *self = GAMES_GAMEPAD_MAPPINGS_MANAGER (object);
+
+  g_hash_table_unref (self->names);
+  g_hash_table_unref (self->mappings);
+
+  G_OBJECT_CLASS (games_gamepad_mappings_manager_parent_class)->finalize (object);
+}
+
+static void
+games_gamepad_mappings_manager_class_init (GamesGamepadMappingsManagerClass *klass)
+{
+  games_gamepad_mappings_manager_parent_class = g_type_class_peek_parent (klass);
+  G_OBJECT_CLASS (klass)->finalize = finalize;
+}
+
+static void
+games_gamepad_mappings_manager_init (GamesGamepadMappingsManager *self)
+{
+}
diff --git a/src/gamepad/gamepad-mappings-manager.h b/src/gamepad/gamepad-mappings-manager.h
new file mode 100644
index 0000000..c15be3b
--- /dev/null
+++ b/src/gamepad/gamepad-mappings-manager.h
@@ -0,0 +1,19 @@
+#ifndef GAMES_GAMEPAD_MAPPINGS_MANAGER_H
+#define GAMES_GAMEPAD_MAPPINGS_MANAGER_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define GAMES_TYPE_GAMEPAD_MAPPINGS_MANAGER (games_gamepad_mappings_manager_get_type())
+
+G_DECLARE_FINAL_TYPE (GamesGamepadMappingsManager, games_gamepad_mappings_manager, GAMES, 
GAMEPAD_MAPPINGS_MANAGER, GObject)
+
+GamesGamepadMappingsManager *games_gamepad_mappings_manager_get_instance (void);
+gchar *games_gamepad_mappings_manager_get_mapping (GamesGamepadMappingsManager *self,
+                                                   const gchar                 *guid);
+
+G_END_DECLS
+
+#endif /* GAMES_GAMEPAD_MAPPINGS_MANAGER_H */
+
diff --git a/src/gamepad/gamepad-mappings-manager.vapi b/src/gamepad/gamepad-mappings-manager.vapi
new file mode 100644
index 0000000..cf8c865
--- /dev/null
+++ b/src/gamepad/gamepad-mappings-manager.vapi
@@ -0,0 +1,7 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+[CCode (cheader_filename = "gamepad-mappings-manager.h")]
+private class Games.GamepadMappingsManager : GLib.Object {
+       public static GamepadMappingsManager get_instance ();
+       public string? get_mapping (string guid);
+}