nvim: remace command! with Lua function

.config/nvim/lua/my/functions.lua

@@ -18,6 +18,7 @@ vim.api.nvim_create_autocmd(
     }
 )
 
+-- Insert or update a modeline at the bottom of the buffer
 function M.insert_modeline()
     local comment_string = vim.o.commentstring
     local space_maybe = ''
@@ -55,7 +56,7 @@ function M.insert_modeline()
         print('modeline inserted')
     end
 end
-vim.cmd([[command! ModelineInsert lua M.insert_modeline()]])
+vim.api.nvim_create_user_command('ModelineInsert', M.insert_modeline, {})
 
 -- set colorcolumn to textwidth after buffer is displayed or option is changed
 function M.set_colorcolumn()

.config/nvim/lua/my/settings.lua

@@ -20,9 +20,12 @@ vim.o.pumheight = 10                        -- maximum entries in popup menu
 vim.o.smartindent = true                    -- indent after { and so on
 vim.o.statusline = '%<%f %h%m%r%=%-16.(%l,%c%V (%P)%)%y'
 vim.o.formatoptions = vim.o.formatoptions .. 'n'
+vim.o.splitright = true                     -- split vertical window right
 
-vim.cmd([[command! -narg=1 -complete=help Hv vert help <args>]])
-vim.cmd([[command! -narg=1 -complete=help Ht tab help <args>]])
+vim.api.nvim_create_user_command('Hv', 'vertical help', {
+    nargs = 1, complete = 'help' })
+vim.api.nvim_create_user_command('Ht', 'tab help', {
+    nargs = 1, complete = 'help' })
 
 -- theme
 vim.o.termguicolors = true                  -- 24 bit colours