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@@ -1 +1,251 @@
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+#ifdef HAVE_CONFIG_H
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+#include "config.h"
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+#endif
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+
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+#include <glib.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <errno.h>
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+
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+#include <json-glib/json-glib.h>
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+#include <json-glib/json-gobject.h>
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+
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+#include "tweet-config.h"
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+
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+#define TWEET_CONFIG_GET_PRIVATE(obj)   (G_TYPE_INSTANCE_GET_PRIVATE ((obj), TWEET_TYPE_CONFIG, TweetConfigPrivate))
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+
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+struct _TweetConfigPrivate
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+{
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+  gchar *username;
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+  gchar *password;
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+};
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+
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+enum
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+{
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+  PROP_0,
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+
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+  PROP_USERNAME,
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+  PROP_PASSWORD
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+};
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+
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+enum
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+{
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+  CHANGED,
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+
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+  LAST_SIGNAL
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+};
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+
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+static guint config_signals[LAST_SIGNAL] = { 0, };
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+
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+static TweetConfig *default_config = NULL;
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+
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+G_DEFINE_TYPE (TweetConfig, tweet_config, G_TYPE_OBJECT);
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+
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+static void
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+tweet_config_finalize (GObject *gobject)
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+{
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+  TweetConfigPrivate *priv = TWEET_CONFIG (gobject)->priv;
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+
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+  g_free (priv->username);
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+  g_free (priv->password);
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+
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+  G_OBJECT_CLASS (tweet_config_parent_class)->finalize (gobject);
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+}
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+
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+static void
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+tweet_config_set_property (GObject      *gobject,
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+                           guint         prop_id,
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+                           const GValue *value,
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+                           GParamSpec   *pspec)
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+{
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+  TweetConfigPrivate *priv = TWEET_CONFIG (gobject)->priv;
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+
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+  switch (prop_id)
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+    {
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+    case PROP_USERNAME:
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+      g_free (priv->username);
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+      priv->username = g_value_dup_string (value);
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+      break;
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+
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+    case PROP_PASSWORD:
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+      g_free (priv->password);
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+      priv->password = g_value_dup_string (value);
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+      break;
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+
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+    default:
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+      G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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+      break;
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+    }
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+}
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+
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+static void
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+tweet_config_get_property (GObject    *gobject,
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+                           guint       prop_id,
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+                           GValue     *value,
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+                           GParamSpec *pspec)
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+{
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+  TweetConfigPrivate *priv = TWEET_CONFIG (gobject)->priv;
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+
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+  switch (prop_id)
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+    {
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+    case PROP_USERNAME:
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+      g_value_set_string (value, priv->username);
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+      break;
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+
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+    case PROP_PASSWORD:
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+      g_value_set_string (value, priv->password);
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+      break;
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+
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+    default:
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+      G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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+      break;
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+    }
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+}
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+
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+static void
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+tweet_config_class_init (TweetConfigClass *klass)
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+{
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+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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+
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+  g_type_class_add_private (klass, sizeof (TweetConfigPrivate));
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+
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+  gobject_class->set_property = tweet_config_set_property;
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+  gobject_class->get_property = tweet_config_get_property;
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+  gobject_class->finalize = tweet_config_finalize;
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+
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+  g_object_class_install_property (gobject_class,
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+                                   PROP_USERNAME,
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+                                   g_param_spec_string ("username",
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+                                                        "Username",
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+                                                        "Username",
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+                                                        NULL,
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+                                                        G_PARAM_READWRITE));
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+  g_object_class_install_property (gobject_class,
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+                                   PROP_PASSWORD,
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+                                   g_param_spec_string ("password",
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+                                                        "Password",
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+                                                        "Password",
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+                                                        NULL,
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+                                                        G_PARAM_READWRITE));
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+
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+  config_signals[CHANGED] =
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+    g_signal_new (g_intern_static_string ("changed"),
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+                  G_TYPE_FROM_CLASS (gobject_class),
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+                  G_SIGNAL_RUN_LAST,
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+                  G_STRUCT_OFFSET (TweetConfigClass, changed),
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+                  NULL, NULL,
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+                  g_cclosure_marshal_VOID__VOID,
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+                  G_TYPE_NONE, 0);
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+}
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+
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+static void
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+tweet_config_init (TweetConfig *config)
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+{
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+  config->priv = TWEET_CONFIG_GET_PRIVATE (config);
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+}
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+
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+TweetConfig *
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+tweet_config_get_default (void)
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+{
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+  if (G_UNLIKELY (default_config == NULL))
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+    {
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+      gchar *filename;
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+      gchar *contents;
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+      gsize length;
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+      GError *error = NULL;
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+
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+      filename = g_build_filename (g_get_user_config_dir (),
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+                                   "tweet",
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+                                   "tweet.json",
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+                                   NULL);
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+
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+      if (g_file_get_contents (filename, &contents, &length, &error))
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+        default_config = TWEET_CONFIG (json_construct_gobject (TWEET_TYPE_CONFIG,
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+                                                               contents, length,
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+                                                               &error));
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+
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+      if (error)
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+        {
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+          /* report every error that it's not "file not found" */
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+          if (!(error->domain == G_FILE_ERROR &&
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+                error->code == G_FILE_ERROR_NOENT))
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+            {
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+              g_warning ("Unable to load configuration file at `%s': %s",
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+                         filename,
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+                         error->message);
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+            }
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+
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+          g_error_free (error);
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+          default_config = NULL;
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+        }
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+
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+      /* no configuration object - fall back to an empty one */
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+      if (!default_config)
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+        default_config = g_object_new (TWEET_TYPE_CONFIG, NULL);
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+
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+      g_free (contents);
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+      g_free (filename);
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+    }
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+
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+  return default_config;
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+}
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+
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+G_CONST_RETURN gchar *
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+tweet_config_get_username (TweetConfig *config)
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+{
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+  g_return_val_if_fail (TWEET_IS_CONFIG (config), NULL);
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+
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+  return config->priv->username;
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+}
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+
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+G_CONST_RETURN gchar *
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+tweet_config_get_password (TweetConfig *config)
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+{
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+  g_return_val_if_fail (TWEET_IS_CONFIG (config), NULL);
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+
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+  return config->priv->password;
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+}
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+
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+void
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+tweet_config_save (TweetConfig *config)
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+{
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+  gchar *conf_dir;
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+  gchar *filename;
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+  gchar *buffer;
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+  gsize len;
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+  GError *error;
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+
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+  conf_dir = g_build_filename (g_get_user_config_dir (), "tweet", NULL);
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+  if (g_mkdir_with_parents (conf_dir, 0700) == -1)
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+    {
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+      if (errno != EEXIST)
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+        g_warning ("Unable to create the configuration directory: %s",
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+                   g_strerror (errno));
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+      g_free (conf_dir);
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+      return;
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+    }
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+
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+  filename = g_build_filename (conf_dir, "tweet.json", NULL);
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+
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+  buffer = json_serialize_gobject (G_OBJECT (config), &len);
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+  if (!buffer)
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+    {
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+      g_warning ("Unable to serialize the configuration");
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+      g_free (filename);
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+      g_free (conf_dir);
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+      return;
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+    }
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+
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+  error = NULL;
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+  g_file_set_contents (filename, buffer, len, &error);
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+  if (error)
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+    {
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+      g_warning ("Unable to save configuration file: %s", error->message);
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+      g_error_free (error);
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+    }
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+
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+  g_free (buffer);
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+  g_free (filename);
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+  g_free (conf_dir);
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+}

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@@ -1 +1,45 @@
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+#ifndef __TWEET_CONFIG_H__
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+#define __TWEET_CONFIG_H__
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+
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+#include <glib-object.h>
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+
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+G_BEGIN_DECLS
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+
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+#define TWEET_TYPE_CONFIG               (tweet_config_get_type ())
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+#define TWEET_CONFIG(obj)               (G_TYPE_CHECK_INSTANCE_CAST ((obj), TWEET_TYPE_CONFIG, TweetConfig))
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+#define TWEET_IS_CONFIG(obj)            (G_TYPE_CHECK_INSTANCE_TYPE ((obj), TWEET_TYPE_CONFIG))
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+#define TWEET_CONFIG_CLASS(klass)       (G_TYPE_CHECK_CLASS_CAST ((klass), TWEET_TYPE_CONFIG, TweetConfigClass))
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+#define TWEET_IS_CONFIG_CLASS(klass)    (G_TYPE_CHECK_CLASS_TYPE ((klass), TWEET_TYPE_CONFIG))
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+#define TWEET_CONFIG_GET_CLASS(obj)     (G_TYPE_INSTANCE_GET_CLASS ((obj), TWEET_TYPE_CONFIG, TweetConfigClass))
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+
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+typedef struct _TweetConfig             TweetConfig;
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+typedef struct _TweetConfigPrivate      TweetConfigPrivate;
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+typedef struct _TweetConfigClass        TweetConfigClass;
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+
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+struct _TweetConfig
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+{
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+  GObject parent_instance;
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+
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+  TweetConfigPrivate *priv;
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+};
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+
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+struct _TweetConfigClass
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+{
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+  GObjectClass parent_class;
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+
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+  void (* changed) (TweetConfig *config);
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+};
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+
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+GType                 tweet_config_get_type     (void) G_GNUC_CONST;
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+
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+TweetConfig *         tweet_config_get_default  (void);
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+
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+G_CONST_RETURN gchar *tweet_config_get_username (TweetConfig *config);
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+G_CONST_RETURN gchar *tweet_config_get_password (TweetConfig *config);
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+
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+void                  tweet_config_save         (TweetConfig *config);
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+
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+G_END_DECLS
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+
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+#endif /* __TWEET_CONFIG_H__ */