[gtksourceview/wip/chergert/vim] implement undo/redo from normal

[Christian Hergert <chergert src gnome org>]

commit 91a8e5012c440971321a9e724932f237da672bc7
Author: Christian Hergert <chergert redhat com>
Date:   Wed Oct 27 07:40:56 2021 -0700

    implement undo/redo from normal

 gtksourceview/vim/gtk-source-vim-normal.c | 45 ++++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 3 deletions(-)
---
diff --git a/gtksourceview/vim/gtk-source-vim-normal.c b/gtksourceview/vim/gtk-source-vim-normal.c
index 1780e35d..52134826 100644
--- a/gtksourceview/vim/gtk-source-vim-normal.c
+++ b/gtksourceview/vim/gtk-source-vim-normal.c
@@ -27,6 +27,8 @@
 #include "gtk-source-vim-normal.h"
 #include "gtk-source-vim-replace.h"
 
+#define REPEAT(_block) do { _block; } while (--self->repeat > 0);
+
 typedef gboolean (*KeyHandler) (GtkSourceVimNormal *self,
                                 guint               keyval,
                                 guint               keycode,
@@ -127,6 +129,38 @@ begin_insert (GtkSourceVimNormal *self,
        gtk_source_vim_state_push (GTK_SOURCE_VIM_STATE (self), gtk_source_vim_insert_new ());
 }
 
+static gboolean
+key_handler_undo (GtkSourceVimNormal *self,
+                  guint               keyval,
+                  guint               keycode,
+                  GdkModifierType     mods,
+                  const char         *string)
+{
+       GtkSourceBuffer *buffer;
+
+       g_assert (GTK_SOURCE_IS_VIM_NORMAL (self));
+
+       buffer = gtk_source_vim_state_get_buffer (GTK_SOURCE_VIM_STATE (self), NULL, NULL);
+
+       switch (keyval)
+       {
+               case GDK_KEY_u:
+                       REPEAT (gtk_text_buffer_undo (GTK_TEXT_BUFFER (buffer)));
+                       break;
+
+               case GDK_KEY_r:
+                       REPEAT (gtk_text_buffer_redo (GTK_TEXT_BUFFER (buffer)));
+                       break;
+
+               default:
+                       return gtk_source_vim_normal_bail (self);
+       }
+
+       gtk_source_vim_normal_clear (self);
+
+       return TRUE;
+}
+
 static gboolean
 key_handler_command (GtkSourceVimNormal *self,
                      guint               keyval,
@@ -172,7 +206,6 @@ key_handler_command (GtkSourceVimNormal *self,
                case GDK_KEY_period:
                case GDK_KEY_s:
                case GDK_KEY_S:
-               case GDK_KEY_u:
                case GDK_KEY_x:
                case GDK_KEY_equal:
                case GDK_KEY_plus:
@@ -506,6 +539,10 @@ key_handler_initial (GtkSourceVimNormal *self,
                                self->handler = key_handler_split;
                                break;
 
+                       case GDK_KEY_r:
+                               self->handler = key_handler_undo;
+                               break;
+
                        default:
                                break;
                }
@@ -569,6 +606,10 @@ key_handler_initial (GtkSourceVimNormal *self,
                                        self->handler = key_handler_repeat;
                                break;
 
+                       case GDK_KEY_u:
+                               self->handler = key_handler_undo;
+                               break;
+
                        case GDK_KEY_a:
                        case GDK_KEY_asciitilde:
                        case GDK_KEY_A:
@@ -582,10 +623,8 @@ key_handler_initial (GtkSourceVimNormal *self,
                        case GDK_KEY_p:
                        case GDK_KEY_P:
                        case GDK_KEY_period:
-                       case GDK_KEY_R:
                        case GDK_KEY_s:
                        case GDK_KEY_S:
-                       case GDK_KEY_u:
                        case GDK_KEY_x:
                        case GDK_KEY_equal:
                        case GDK_KEY_plus: