[gnome-builder/wip/gtk4-port: 310/343] libide/editor: add simplified API to load buffer/location

[Christian Hergert <chergert src gnome org>]

commit 3232a5e6efa142955291ccedab15882a15d1b0a8
Author: Christian Hergert <chergert redhat com>
Date:   Sat Apr 2 02:16:40 2022 -0700

    libide/editor: add simplified API to load buffer/location

 src/libide/editor/ide-editor.c    | 253 ++++++++++++++++++++++++++++++++++++++
 src/libide/editor/ide-editor.h    |  38 ++++++
 src/libide/editor/libide-editor.h |   1 +
 src/libide/editor/meson.build     |   2 +
 4 files changed, 294 insertions(+)
---
diff --git a/src/libide/editor/ide-editor.c b/src/libide/editor/ide-editor.c
new file mode 100644
index 000000000..a6121eb75
--- /dev/null
+++ b/src/libide/editor/ide-editor.c
@@ -0,0 +1,253 @@
+/* ide-editor.c
+ *
+ * Copyright 2022 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#define G_LOG_DOMAIN "ide-editor"
+
+#include "config.h"
+
+#include <glib/gi18n.h>
+
+#include "ide-editor.h"
+#include "ide-editor-page.h"
+
+typedef struct _Focus
+{
+  IdeWorkspace *workspace;
+  IdeFrame     *frame;
+  IdeLocation  *location;
+  IdeBuffer    *buffer;
+  GFile        *file;
+} Focus;
+
+static Focus *
+focus_new (IdeWorkspace *workspace,
+           IdeFrame     *frame,
+           IdeBuffer    *buffer,
+           IdeLocation  *location)
+{
+  IdeBufferManager *bufmgr;
+  IdeContext *context;
+  Focus *focus;
+  GFile *file = NULL;
+
+  g_assert (IDE_IS_WORKSPACE (workspace));
+  g_assert (!frame || IDE_IS_FRAME (frame));
+  g_assert (!buffer || IDE_IS_BUFFER (buffer));
+  g_assert (!location || IDE_IS_LOCATION (location));
+  g_assert (buffer != NULL || location != NULL);
+
+  context = ide_workspace_get_context (workspace);
+  bufmgr = ide_buffer_manager_from_context (context);
+
+  g_assert (IDE_IS_CONTEXT (context));
+  g_assert (IDE_IS_BUFFER_MANAGER (bufmgr));
+
+  if (location != NULL)
+    file = ide_location_get_file (location);
+  else
+    file = ide_buffer_get_file (buffer);
+
+  g_assert (buffer != NULL || file != NULL);
+
+  if (buffer == NULL)
+    buffer = ide_buffer_manager_find_buffer (bufmgr, file);
+
+  if (frame == NULL)
+    frame = ide_workspace_get_most_recent_frame (workspace);
+
+  g_assert (IDE_IS_FRAME (frame));
+
+  focus = g_atomic_rc_box_alloc0 (sizeof *focus);
+  g_set_object (&focus->workspace, workspace);
+  g_set_object (&focus->frame, frame);
+  g_set_object (&focus->buffer, buffer);
+  g_set_object (&focus->location, location);
+  g_set_object (&focus->file, file);
+
+  return focus;
+}
+
+static void
+focus_finalize (gpointer data)
+{
+  Focus *focus = data;
+
+  g_clear_object (&focus->workspace);
+  g_clear_object (&focus->location);
+  g_clear_object (&focus->buffer);
+  g_clear_object (&focus->frame);
+  g_clear_object (&focus->file);
+}
+
+static void
+focus_free (Focus *focus)
+{
+  g_atomic_rc_box_release_full (focus, focus_finalize);
+}
+
+static void
+focus_complete (Focus        *focus,
+                const GError *error)
+{
+  g_assert (focus != NULL);
+  g_assert (G_IS_FILE (focus->file));
+  g_assert (!focus->location || IDE_IS_LOCATION (focus->location));
+  g_assert (!focus->buffer || IDE_IS_BUFFER (focus->buffer));
+  g_assert (focus->buffer || error != NULL);
+  g_assert (IDE_IS_WORKSPACE (focus->workspace));
+  g_assert (IDE_IS_FRAME (focus->frame));
+
+  if (error != NULL)
+    {
+      IdeContext *context = ide_workspace_get_context (focus->workspace);
+      ide_context_warning (context,
+                           /* translators: %s is replaced with the error message */
+                           _("Failed to open file: %s"),
+                           error->message);
+    }
+  else
+    {
+      guint n_pages = panel_frame_get_n_pages (PANEL_FRAME (focus->frame));
+      IdeEditorPage *page = NULL;
+
+      for (guint i = 0; i < n_pages; i++)
+        {
+          PanelWidget *child = panel_frame_get_page (PANEL_FRAME (focus->frame), i);
+
+          if (IDE_IS_EDITOR_PAGE (child))
+            {
+              IdeBuffer *buffer = ide_editor_page_get_buffer (IDE_EDITOR_PAGE (child));
+
+              if (buffer == focus->buffer)
+                {
+                  page = IDE_EDITOR_PAGE (child);
+                  break;
+                }
+            }
+        }
+
+      g_assert (!page || IDE_IS_EDITOR_PAGE (page));
+
+      if (page == NULL)
+        {
+          page = IDE_EDITOR_PAGE (ide_editor_page_new (focus->buffer));
+          panel_frame_add (PANEL_FRAME (focus->frame), PANEL_WIDGET (page));
+        }
+
+      panel_frame_set_visible_child (PANEL_FRAME (focus->frame), PANEL_WIDGET (page));
+
+      if (focus->location != NULL)
+        {
+          IdeSourceView *view = ide_editor_page_get_view (page);
+          GtkTextIter iter;
+
+          ide_buffer_get_iter_at_location (focus->buffer, &iter, focus->location);
+          gtk_text_buffer_select_range (GTK_TEXT_BUFFER (focus->buffer), &iter, &iter);
+          ide_source_view_scroll_to_insert (view);
+        }
+    }
+
+  focus_free (focus);
+}
+
+static void
+ide_editor_load_file_cb (GObject      *object,
+                         GAsyncResult *result,
+                         gpointer      user_data)
+{
+  IdeBufferManager *bufmgr = (IdeBufferManager *)object;
+  g_autoptr(IdeBuffer) buffer = NULL;
+  g_autoptr(GError) error = NULL;
+  Focus *focus = user_data;
+
+  g_assert (IDE_IS_BUFFER_MANAGER (bufmgr));
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (focus != NULL);
+  g_assert (IDE_IS_WORKSPACE (focus->workspace));
+  g_assert (IDE_IS_FRAME (focus->frame));
+  g_assert (G_IS_FILE (focus->file));
+
+  if ((buffer = ide_buffer_manager_load_file_finish (bufmgr, result, &error)))
+    g_set_object (&focus->buffer, buffer);
+
+  focus_complete (focus, error);
+}
+
+static void
+do_focus (IdeWorkspace *workspace,
+          IdeFrame     *frame,
+          IdeBuffer    *buffer,
+          IdeLocation  *location)
+{
+  IdeBufferManager *bufmgr;
+  IdeContext *context;
+  Focus *focus;
+
+  g_assert (IDE_IS_WORKSPACE (workspace));
+  g_assert (!frame || IDE_IS_FRAME (frame));
+  g_assert (!buffer || IDE_IS_BUFFER (buffer));
+  g_assert (!location || IDE_IS_LOCATION (location));
+  g_assert (buffer != NULL || location != NULL);
+
+  context = ide_workspace_get_context (workspace);
+  bufmgr = ide_buffer_manager_from_context (context);
+
+  g_assert (IDE_IS_CONTEXT (context));
+  g_assert (IDE_IS_BUFFER_MANAGER (bufmgr));
+
+  focus = focus_new (workspace, frame, buffer, location);
+
+  if (focus->buffer == NULL)
+    ide_buffer_manager_load_file_async (bufmgr,
+                                        focus->file,
+                                        IDE_BUFFER_OPEN_FLAGS_NONE,
+                                        NULL,
+                                        ide_workspace_get_cancellable (workspace),
+                                        ide_editor_load_file_cb,
+                                        focus);
+  else
+    focus_complete (focus, NULL);
+}
+
+void
+ide_editor_focus_location (IdeWorkspace *workspace,
+                           IdeFrame     *frame,
+                           IdeLocation  *location)
+{
+  g_return_if_fail (IDE_IS_WORKSPACE (workspace));
+  g_return_if_fail (!frame || IDE_IS_FRAME (frame));
+  g_return_if_fail (!frame || GTK_WIDGET (workspace) == gtk_widget_get_ancestor (GTK_WIDGET (frame), 
IDE_TYPE_WORKSPACE));
+  g_return_if_fail (IDE_IS_LOCATION (location));
+
+  do_focus (workspace, frame, NULL, location);
+}
+
+void
+ide_editor_focus_buffer (IdeWorkspace *workspace,
+                         IdeFrame     *frame,
+                         IdeBuffer    *buffer)
+{
+  g_return_if_fail (IDE_IS_WORKSPACE (workspace));
+  g_return_if_fail (!frame || IDE_IS_FRAME (frame));
+  g_return_if_fail (!frame || GTK_WIDGET (workspace) == gtk_widget_get_ancestor (GTK_WIDGET (frame), 
IDE_TYPE_WORKSPACE));
+  g_return_if_fail (IDE_IS_BUFFER (buffer));
+
+  do_focus (workspace, frame, buffer, NULL);
+}
diff --git a/src/libide/editor/ide-editor.h b/src/libide/editor/ide-editor.h
new file mode 100644
index 000000000..652b5b82c
--- /dev/null
+++ b/src/libide/editor/ide-editor.h
@@ -0,0 +1,38 @@
+/* ide-editor.h
+ *
+ * Copyright 2022 Christian Hergert <chergert redhat com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#pragma once
+
+#include <libide-core.h>
+#include <libide-code.h>
+#include <libide-gui.h>
+
+G_BEGIN_DECLS
+
+IDE_AVAILABLE_IN_ALL
+void ide_editor_focus_location (IdeWorkspace *workspace,
+                                IdeFrame     *frame,
+                                IdeLocation  *location);
+IDE_AVAILABLE_IN_ALL
+void ide_editor_focus_buffer   (IdeWorkspace *workspace,
+                                IdeFrame     *frame,
+                                IdeBuffer    *buffer);
+
+G_END_DECLS
diff --git a/src/libide/editor/libide-editor.h b/src/libide/editor/libide-editor.h
index 5d1a569f0..2f564d66e 100644
--- a/src/libide/editor/libide-editor.h
+++ b/src/libide/editor/libide-editor.h
@@ -21,5 +21,6 @@
 #pragma once
 
 #define IDE_EDITOR_INSIDE
+# include "ide-editor.h"
 # include "ide-editor-page.h"
 #undef IDE_EDITOR_INSIDE
diff --git a/src/libide/editor/meson.build b/src/libide/editor/meson.build
index 3cd3b9f88..42317d764 100644
--- a/src/libide/editor/meson.build
+++ b/src/libide/editor/meson.build
@@ -11,6 +11,7 @@ libide_editor_generated_headers = []
 #
 
 libide_editor_public_headers = [
+  'ide-editor.h',
   'ide-editor-page.h',
   'libide-editor.h',
 ]
@@ -25,6 +26,7 @@ install_headers(libide_editor_public_headers, subdir: libide_editor_header_subdi
 #
 
 libide_editor_public_sources = [
+  'ide-editor.c',
   'ide-editor-page.c',
 ]