[gtksourceview] vim: add API to reset registers

[Christian Hergert <chergert src gnome org>]

commit 2208eb06a80bcf1d320c0a77901a30d1b279ba25
Author: Christian Hergert <chergert redhat com>
Date:   Wed May 18 03:42:21 2022 -0700

    vim: add API to reset registers
    
    We want to use this internally with tests.

 gtksourceview/vim/gtksourcevimregisters.c | 17 +++++++++++++++++
 gtksourceview/vim/gtksourcevimregisters.h |  1 +
 2 files changed, 18 insertions(+)
---
diff --git a/gtksourceview/vim/gtksourcevimregisters.c b/gtksourceview/vim/gtksourcevimregisters.c
index 58c08981..c6d664ce 100644
--- a/gtksourceview/vim/gtksourcevimregisters.c
+++ b/gtksourceview/vim/gtksourcevimregisters.c
@@ -323,3 +323,20 @@ gtk_source_vim_register_is_read_only (const char *name)
                return FALSE;
        }
 }
+
+void
+gtk_source_vim_registers_reset (GtkSourceVimRegisters *self)
+{
+       g_return_if_fail (GTK_SOURCE_IS_VIM_REGISTERS (self));
+
+       g_hash_table_remove_all (self->values);
+       g_clear_pointer (&self->clipboard, g_ref_string_release);
+       g_clear_pointer (&self->primary_clipboard, g_ref_string_release);
+
+       for (guint i = 0; i < G_N_ELEMENTS (self->numbered); i++)
+       {
+               self->numbered[i] = NULL;
+       }
+
+       self->numbered_pos = 0;
+}
diff --git a/gtksourceview/vim/gtksourcevimregisters.h b/gtksourceview/vim/gtksourcevimregisters.h
index 94f5bb40..c27604a3 100644
--- a/gtksourceview/vim/gtksourcevimregisters.h
+++ b/gtksourceview/vim/gtksourcevimregisters.h
@@ -37,6 +37,7 @@ const char        *gtk_source_vim_registers_get_numbered (GtkSourceVimRegisters
 void               gtk_source_vim_registers_set          (GtkSourceVimRegisters *self,
                                                           const char            *name,
                                                           const char            *string);
+void               gtk_source_vim_registers_reset        (GtkSourceVimRegisters *self);
 void               gtk_source_vim_registers_clear        (GtkSourceVimRegisters *self,
                                                           const char            *name);
 gboolean           gtk_source_vim_register_is_read_only  (const char            *name);