new autocmds and change comment position in auto.lua

lua/core/auto.lua

@@ -4,8 +4,7 @@ end
 
 a.nvim_create_augroup('bufcheck', {clear = true})
 
--- highlight yanks
-auto('TextYankPost', {
+auto('TextYankPost', { -- highlight yanks
   group = 'bufcheck',
   pattern = '*',
   callback = function()
@@ -13,21 +12,18 @@ auto('TextYankPost', {
   end
 })
 
--- start git messages in insert mode
-auto('FileType', {
+auto('FileType', { -- start git messages in insert mode
   group = 'bufcheck',
   pattern = { 'gitcommit', 'gitrebase', },
   command = 'startinsert | 1'
 })
 
--- return to last place
-auto('BufRead', {
+auto('BufRead', { -- return to last place
   pattern = '*',
   command = [[call setpos(".", getpos("'\""))]]
 })
 
--- start terminal in insert mode
-auto('TermOpen', {
+auto('TermOpen', { -- start terminal in insert mode
   group    = 'bufcheck',
   pattern  = '*',
   callback = function()
@@ -37,8 +33,7 @@ auto('TermOpen', {
   end
 })
 
--- close terminal buffers after shell dies
-auto('TermClose', {
+auto('TermClose', { -- close terminal buffers after shell dies
   group    = 'bufcheck',
   pattern  = 'term://*',
   callback = function()
@@ -47,6 +42,20 @@ auto('TermClose', {
   end
 })
 
+auto('InsertEnter', { -- toggle things when entering insert mode
+  group = 'bufcheck',
+  callback = function()
+    o.colorcolumn = { 80 }
+  end
+})
+
+auto('InsertLeave', { -- toggle things when exiting insert mode
+  group = 'bufcheck',
+  callback = function()
+    o.colorcolumn = { 0 }
+  end
+})
+
 auto('BufWritePre', { -- make dirs when they don't exist
   pattern = '*',
   group = vim.api.nvim_create_augroup('auto_create_dir', { clear = true }),