Merge #15440 close 'shell' :terminal automatically

runtime/doc/news.txt

@@ -190,6 +190,10 @@ The following changes to existing APIs or features add new behavior.
   supports it, unless |'keywordprg'| was customized before calling
   |vim.lsp.start()|.
 
+• Terminal buffers started with no arguments (and use 'shell') close
+  automatically if the job exited without error, eliminating the (often
+  unwanted) "[Process exited 0]" message.
+
 ==============================================================================
 REMOVED FEATURES                                                 *news-removed*
 

runtime/doc/various.txt

@@ -249,6 +249,10 @@ gx			Opens the current filepath or URL (decided by
 			Fails if changes have been made to the current buffer,
 			unless 'hidden' is set.
 
+			If {cmd} is omitted, and the 'shell' job exits with no
+			error, the buffer is closed automatically
+			|default-autocmds|.
+
 			To enter |Terminal-mode| automatically: >
 			      autocmd TermOpen * startinsert
 <

runtime/doc/vim_diff.txt

@@ -133,6 +133,8 @@ remove them and ":autocmd {group}" to see how they're defined.
 
 nvim_terminal:
 - BufReadCmd: Treats "term://" buffers as |terminal| buffers. |terminal-start|
+- TermClose: A |terminal| buffer started with no arguments (which thus uses
+  'shell') and which exits with no error is closed automatically.
 
 nvim_cmdwin:
 - CmdwinEnter: Limits syntax sync to maxlines=1 in the |cmdwin|.

runtime/lua/vim/_editor.lua

@@ -1107,13 +1107,26 @@ end
 
 function vim._init_default_autocmds()
   local nvim_terminal_augroup = vim.api.nvim_create_augroup('nvim_terminal', {})
-  vim.api.nvim_create_autocmd({ 'bufreadcmd' }, {
+  vim.api.nvim_create_autocmd({ 'BufReadCmd' }, {
     pattern = 'term://*',
     group = nvim_terminal_augroup,
     nested = true,
     command = "if !exists('b:term_title')|call termopen(matchstr(expand(\"<amatch>\"), '\\c\\mterm://\\%(.\\{-}//\\%(\\d\\+:\\)\\?\\)\\?\\zs.*'), {'cwd': expand(get(matchlist(expand(\"<amatch>\"), '\\c\\mterm://\\(.\\{-}\\)//'), 1, ''))})",
   })
-  vim.api.nvim_create_autocmd({ 'cmdwinenter' }, {
+  vim.api.nvim_create_autocmd({ 'TermClose' }, {
+    group = nvim_terminal_augroup,
+    desc = 'Automatically close terminal buffers when started with no arguments and exiting without an error',
+    callback = function(args)
+      if vim.v.event.status == 0 then
+        local info = vim.api.nvim_get_chan_info(vim.bo[args.buf].channel)
+        local argv = info.argv or {}
+        if #argv == 1 and argv[1] == vim.o.shell then
+          vim.cmd({ cmd = 'bdelete', args = { args.buf }, bang = true })
+        end
+      end
+    end,
+  })
+  vim.api.nvim_create_autocmd({ 'CmdwinEnter' }, {
     pattern = '[:>]',
     group = vim.api.nvim_create_augroup('nvim_cmdwin', {}),
     command = 'syntax sync minlines=1 maxlines=1',