[gtksourceview] vim: map textwidth/tw to right-margin-position

[Christian Hergert <chergert src gnome org>]

commit f5968e7802e4a7e3379eb47df735de44fe05a862
Author: Christian Hergert <chergert redhat com>
Date:   Sat Nov 27 18:07:55 2021 -0600

    vim: map textwidth/tw to right-margin-position

 gtksourceview/vim/gtksourcevimcommand.c | 12 ++++++++++++
 testsuite/test-vim-input.c              |  1 +
 2 files changed, 13 insertions(+)
---
diff --git a/gtksourceview/vim/gtksourcevimcommand.c b/gtksourceview/vim/gtksourcevimcommand.c
index b923555d..efe14b04 100644
--- a/gtksourceview/vim/gtksourcevimcommand.c
+++ b/gtksourceview/vim/gtksourcevimcommand.c
@@ -1178,6 +1178,18 @@ gtk_source_vim_command_set (GtkSourceVimCommand *self)
                                        gtk_source_view_set_indent_width (view, n);
                        }
                }
+               else if (g_str_has_prefix (part, "tw=") ||
+                        g_str_has_prefix (part, "textwidth="))
+               {
+                       const char *sw = strchr (part, '=') + 1;
+                       int n;
+
+                       if (parse_number (sw, &n))
+                       {
+                               if (n >= 1 && n <= 1000)
+                                       gtk_source_view_set_right_margin_position (view, n);
+                       }
+               }
                else if (g_str_equal (part, "et") ||
                         g_str_equal (part, "expandtab"))
                {
diff --git a/testsuite/test-vim-input.c b/testsuite/test-vim-input.c
index 0bae218c..7423556f 100644
--- a/testsuite/test-vim-input.c
+++ b/testsuite/test-vim-input.c
@@ -218,6 +218,7 @@ test_command_bar (void)
        run_test ("", ":set ts=0\n", "");
        run_test ("", ":set ts=-2\n", "");
        run_test ("", ":set ts=33\n", "");
+       run_test ("", ":set tw=100\n", "");
 }
 
 static void