Add autocmds to improve :terminal usability

lua/autocmds.lua

@@ -22,3 +22,46 @@ vim.api.nvim_create_autocmd('BufRead', {
     })
   end
 })
+
+-- Start terminals in insert mode
+vim.api.nvim_create_autocmd('TermOpen', {
+  group = group, pattern = 'term://*',
+  callback = function()
+    vim.cmd [[ startinsert ]]
+  end
+})
+
+-- Don't show the line number column in terminal-insert mode
+vim.api.nvim_create_autocmd('TermEnter', {
+  group = group, pattern = 'term://*',
+  callback = function()
+    vim.opt.number = false
+    vim.opt.relativenumber = false
+    vim.opt.signcolumn = 'no'
+  end
+})
+
+-- But do show the line number column in terminal-normal mode
+vim.api.nvim_create_autocmd('TermLeave', {
+  group = group, pattern = 'term://*',
+  callback = function()
+    vim.opt.number = true
+    vim.opt.relativenumber = true
+    vim.opt.signcolumn = 'yes'
+  end
+})
+
+-- Automatically press enter when the terminal process exit successfully
+vim.api.nvim_create_autocmd('TermClose', {
+  group = group,
+  pattern = 'term://*',
+  callback = function()
+    if vim.v.event.status == 0 then
+      -- Exit success, send enter to close the buffer
+      vim.api.nvim_input('<CR>')
+    else
+      -- Exit failure, enter normal mode for inspection
+      vim.api.nvim_input('<C-\\><C-n>')
+    end
+  end
+})