[tepl] FileLoader: dumb re-implementation

[Sébastien Wilmet <swilmet src gnome org>]

commit 381054663be242434a75dfa7e55047e619e5aa53
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Tue May 19 02:04:21 2020 +0200

    FileLoader: dumb re-implementation

 tepl/tepl-file-loader.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 88 insertions(+), 1 deletion(-)
---
diff --git a/tepl/tepl-file-loader.c b/tepl/tepl-file-loader.c
index 388c8e0..3246179 100644
--- a/tepl/tepl-file-loader.c
+++ b/tepl/tepl-file-loader.c
@@ -2,7 +2,9 @@
  * SPDX-License-Identifier: LGPL-3.0-or-later
  */
 
+#include "config.h"
 #include "tepl-file-loader.h"
+#include <glib/gi18n-lib.h>
 
 /**
  * SECTION:file-loader
@@ -42,6 +44,8 @@ struct _TeplFileLoaderPrivate
        TeplFile *file;
 
        GFile *location;
+
+       guint is_loading : 1;
 };
 
 enum
@@ -298,6 +302,56 @@ tepl_file_loader_get_location (TeplFileLoader *loader)
        return loader->priv->location;
 }
 
+static void
+load_contents_cb (GObject      *source_object,
+                 GAsyncResult *result,
+                 gpointer      user_data)
+{
+       GFile *location = G_FILE (source_object);
+       GTask *task = G_TASK (user_data);
+       TeplFileLoader *loader = g_task_get_source_object (task);
+       gchar *content = NULL;
+       gsize content_length = 0;
+       GError *error = NULL;
+
+       g_file_load_contents_finish (location,
+                                    result,
+                                    &content,
+                                    &content_length,
+                                    NULL,
+                                    &error);
+
+       if (error != NULL)
+       {
+               g_task_return_error (task, error);
+               g_object_unref (task);
+               goto out;
+       }
+
+       if (!g_utf8_validate_len (content, content_length, NULL))
+       {
+               g_task_return_new_error (task,
+                                        G_IO_ERROR,
+                                        G_IO_ERROR_INVALID_DATA,
+                                        _("The content must be encoded with the UTF-8 character encoding."));
+               g_object_unref (task);
+               goto out;
+       }
+
+       if (loader->priv->buffer != NULL)
+       {
+               gtk_text_buffer_set_text (GTK_TEXT_BUFFER (loader->priv->buffer),
+                                         content,
+                                         content_length);
+       }
+
+       g_task_return_boolean (task, TRUE);
+       g_object_unref (task);
+
+out:
+       g_free (content);
+}
+
 /**
  * tepl_file_loader_load_async:
  * @loader: a #TeplFileLoader.
@@ -321,8 +375,34 @@ tepl_file_loader_load_async (TeplFileLoader      *loader,
                             GAsyncReadyCallback  callback,
                             gpointer             user_data)
 {
+       GTask *task;
+
        g_return_if_fail (TEPL_IS_FILE_LOADER (loader));
        g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
+       g_return_if_fail (!loader->priv->is_loading);
+
+       loader->priv->is_loading = TRUE;
+
+       task = g_task_new (loader, cancellable, callback, user_data);
+       g_task_set_priority (task, io_priority);
+
+       if (loader->priv->buffer == NULL ||
+           loader->priv->file == NULL ||
+           loader->priv->location == NULL)
+       {
+               g_task_return_boolean (task, FALSE);
+               g_object_unref (task);
+               return;
+       }
+
+       gtk_source_buffer_begin_not_undoable_action (GTK_SOURCE_BUFFER (loader->priv->buffer));
+       gtk_text_buffer_set_text (GTK_TEXT_BUFFER (loader->priv->buffer), "", -1);
+       gtk_text_buffer_set_modified (GTK_TEXT_BUFFER (loader->priv->buffer), FALSE);
+
+       g_file_load_contents_async (loader->priv->location,
+                                   cancellable,
+                                   load_contents_cb,
+                                   task);
 }
 
 /**
@@ -345,5 +425,12 @@ tepl_file_loader_load_finish (TeplFileLoader  *loader,
        g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
        g_return_val_if_fail (g_task_is_valid (result, loader), FALSE);
 
-       return FALSE;
+       if (loader->priv->buffer != NULL)
+       {
+               gtk_source_buffer_end_not_undoable_action (GTK_SOURCE_BUFFER (loader->priv->buffer));
+               gtk_text_buffer_set_modified (GTK_TEXT_BUFFER (loader->priv->buffer), FALSE);
+       }
+
+       loader->priv->is_loading = FALSE;
+       return g_task_propagate_boolean (G_TASK (result), error);
 }