nvim: fix textwidth to colorcolumn autocmd

.config/nvim/lua/coding.lua

@@ -20,17 +20,14 @@ packer.use {
     map('n', '<Leader>g', ':Neogit<cr>')
 }
 
+-- start git commits in insert mode
 vim.api.nvim_create_augroup('config_coding', { clear = true })
 vim.api.nvim_create_autocmd(
     { 'FileType' },
     {
         group = 'config_coding',
         pattern = { 'gitcommit', 'gitrebase' },
-        callback = function()
-            -- FIXME: why does the autocmd in settings.lua not set it?
-            vim.opt_local.colorcolumn = tostring(vim.o.textwidth)
-            vim.cmd([[startinsert | 1]])
-        end
+        command = [[startinsert | 1]]
     })
 
 packer.use {

.config/nvim/lua/functions.lua

@@ -55,3 +55,28 @@ function my_insert_modeline()
     end
 end
 vim.cmd([[command! ModelineInsert lua my_insert_modeline()]])
+
+-- set colorcolumn to textwidth after buffer is displayed or option is changed
+function my_set_colorcolumn()
+    if vim.o.textwidth > 0 then
+        vim.opt_local.colorcolumn = { vim.o.textwidth }
+    else
+        vim.opt_local.colorcolumn = ''
+    end
+end
+vim.api.nvim_create_augroup('config_settings', { clear = true })
+vim.api.nvim_create_autocmd(
+    { 'BufEnter' },
+    {
+        group = 'config_settings',
+        callback = my_set_colorcolumn
+    }
+)
+vim.api.nvim_create_autocmd(
+    { 'OptionSet' },
+    {
+        group = 'config_settings',
+        pattern = { 'textwidth' },
+        callback = my_set_colorcolumn
+    }
+)

.config/nvim/lua/settings.lua

@@ -26,20 +26,3 @@ packer.use {
 }
 
 packer.use 'https://github.com/editorconfig/editorconfig-vim'
-
--- set colorcolumn to textwidth after buffer is displayed or option is changed
-vim.api.nvim_create_augroup('config_settings', { clear = true })
-vim.api.nvim_create_autocmd(
-    { 'OptionSet' },
-    {
-        group = 'config_settings',
-        pattern = { 'textwidth' },
-        callback = function()
-            if vim.o.textwidth > 0 then
-                vim.opt_local.colorcolumn = tostring(vim.o.textwidth)
-            else
-                vim.opt_local.colorcolumn = ''
-            end
-        end
-    }
-)