refactor(terminal): move :terminal defaults to _defaults.lua

runtime/doc/news.txt

@@ -140,6 +140,8 @@ TERMINAL
 
 • The |terminal| now understands the OSC 52 escape sequence to write to the
   system clipboard (copy). Querying with OSC 52 (paste) is not supported.
+• |hl-StatusLineTerm| and |hl-StatusLineTermNC| define highlights for the
+  status line in |terminal| windows.
 
 TREESITTER
 

runtime/doc/syntax.txt

@@ -5111,7 +5111,7 @@ StatusLineNC	Status lines of not-current windows.
 StatusLineTerm	Status line of |terminal| window.
 							*hl-StatusLineTermNC*
 StatusLineTermNC
-		Status line of non-current |terminal| window.
+		Status line of non-current |terminal| windows.
 							*hl-TabLine*
 TabLine		Tab pages line, not active tab page label.
 							*hl-TabLineFill*

runtime/doc/vim_diff.txt

@@ -166,6 +166,14 @@ nvim_terminal:
   when 'background' is "light". While this may not reflect the actual
   foreground/background color, it permits 'background' to be retained for a
   nested Nvim instance running in the terminal emulator.
+- TermOpen: Sets default options for |terminal| buffers:
+    - 'nomodifiable'
+    - 'undolevels' set to -1
+    - 'textwidth' set to 0
+    - 'nowrap'
+    - 'nolist'
+    - 'winhighlight' uses |hl-StatusLineTerm| and |hl-StatusLineTermNC| in
+      place of |hl-StatusLine| and |hl-StatusLineNC|
 
 nvim_cmdwin:
 - CmdwinEnter: Limits syntax sync to maxlines=1 in the |cmdwin|.
@@ -538,6 +546,8 @@ Highlight groups:
 - Highlight groups names are allowed to contain `@` characters.
   - It is an error to define a highlight group with a name that doesn't match
     the regexp `[a-zA-Z0-9_.@-]*` (see |group-name|).
+- |hl-StatusLineTerm| |hl-StatusLineTermNC| are implemented as 'winhighlight'
+  window-local highlights which are set by the default |TermOpen| handler.
 
 Macro (|recording|) behavior:
 - Replay of a macro recorded during :lmap produces the same actions as when it
@@ -665,17 +675,6 @@ Events:
 - *SafeStateAgain*
 - *SigUSR1* Use |Signal| to detect `SIGUSR1` signal instead.
 
-Highlight groups:
-- *hl-StatusLineTerm* *hl-StatusLineTermNC* are unnecessary because Nvim
-  supports 'winhighlight' window-local highlights. For example, to mimic Vim's
-  StatusLineTerm:  >vim
-      hi StatusLineTerm ctermfg=black ctermbg=green
-      hi StatusLineTermNC ctermfg=green
-      autocmd TermOpen,WinEnter * if &buftype=='terminal'
-        \|setlocal winhighlight=StatusLine:StatusLineTerm,StatusLineNC:StatusLineTermNC
-        \|else|setlocal winhighlight=|endif
-<
-
 Options:
 - *'aleph'* *'al'*
 - antialias

runtime/lua/vim/_defaults.lua

@@ -282,6 +282,26 @@ do
     end,
   })
 
+  vim.api.nvim_create_autocmd('TermOpen', {
+    group = nvim_terminal_augroup,
+    desc = 'Default settings for :terminal buffers',
+    callback = function()
+      vim.bo.modifiable = false
+      vim.bo.undolevels = -1
+      vim.bo.scrollback = vim.o.scrollback < 0 and 10000 or math.max(1, vim.o.scrollback)
+      vim.bo.textwidth = 0
+      vim.wo.wrap = false
+      vim.wo.list = false
+
+      -- This is gross. Proper list options support when?
+      local winhl = vim.o.winhighlight
+      if winhl ~= '' then
+        winhl = winhl .. ','
+      end
+      vim.wo.winhighlight = winhl .. 'StatusLine:StatusLineTerm,StatusLineNC:StatusLineTermNC'
+    end,
+  })
+
   vim.api.nvim_create_autocmd('CmdwinEnter', {
     pattern = '[:>]',
     desc = 'Limit syntax sync to maxlines=1 in the command window',

src/nvim/terminal.c

@@ -343,14 +343,6 @@ void terminal_open(Terminal **termpp, buf_T *buf, TerminalOptions opts)
   refresh_screen(term, buf);
   set_option_value(kOptBuftype, STATIC_CSTR_AS_OPTVAL("terminal"), OPT_LOCAL);
 
-  // Default settings for terminal buffers
-  buf->b_p_ma = false;     // 'nomodifiable'
-  buf->b_p_ul = -1;        // 'undolevels'
-  buf->b_p_scbk =          // 'scrollback' (initialize local from global)
-                  (p_scbk < 0) ? 10000 : MAX(1, p_scbk);
-  buf->b_p_tw = 0;         // 'textwidth'
-  set_option_value(kOptWrap, BOOLEAN_OPTVAL(false), OPT_LOCAL);
-  set_option_value(kOptList, BOOLEAN_OPTVAL(false), OPT_LOCAL);
   if (buf->b_ffname != NULL) {
     buf_set_term_title(buf, buf->b_ffname, strlen(buf->b_ffname));
   }

test/functional/terminal/buffer_spec.lua

@@ -196,10 +196,10 @@ describe(':terminal buffer', function()
     screen:expect([[
       ab^c                                               |
       {4:~                                                 }|
-      {5:==========                                        }|
+      {17:==========                                        }|
       rows: 2, cols: 50                                 |
       {2: }                                                 |
-      {1:==========                                        }|
+      {18:==========                                        }|
                                                         |
     ]])
 
@@ -340,7 +340,7 @@ describe(':terminal buffer', function()
     eq(termbuf, eval('g:termbuf'))
   end)
 
-  it('TermReqeust synchronization #27572', function()
+  it('TermRequest synchronization #27572', function()
     command('autocmd! nvim_terminal TermRequest')
     local term = exec_lua([[
       _G.input = {}

test/functional/terminal/mouse_spec.lua

@@ -14,10 +14,12 @@ describe(':terminal mouse', function()
   before_each(function()
     clear()
     api.nvim_set_option_value('statusline', '==========', {})
-    command('highlight StatusLine cterm=NONE')
-    command('highlight StatusLineNC cterm=NONE')
-    command('highlight VertSplit cterm=NONE')
     screen = tt.screen_setup()
+    command('highlight StatusLine NONE')
+    command('highlight StatusLineNC NONE')
+    command('highlight StatusLineTerm NONE')
+    command('highlight StatusLineTermNC NONE')
+    command('highlight VertSplit NONE')
     local lines = {}
     for i = 1, 30 do
       table.insert(lines, 'line' .. tostring(i))

test/functional/terminal/testutil.lua

@@ -92,6 +92,8 @@ local function screen_setup(extra_rows, command, cols, env, screen_opts)
 
   api.nvim_command('highlight TermCursor cterm=reverse')
   api.nvim_command('highlight TermCursorNC ctermbg=11')
+  api.nvim_command('highlight StatusLineTerm ctermbg=2 ctermfg=0')
+  api.nvim_command('highlight StatusLineTermNC ctermbg=2 ctermfg=8')
 
   local screen = Screen.new(cols, 7 + extra_rows)
   screen:set_default_attr_ids({
@@ -111,6 +113,8 @@ local function screen_setup(extra_rows, command, cols, env, screen_opts)
     [14] = { underline = true, reverse = true, bold = true },
     [15] = { underline = true, foreground = 12 },
     [16] = { background = 248, foreground = 0 }, -- Visual in :terminal session
+    [17] = { background = 2, foreground = 0 }, -- StatusLineTerm
+    [18] = { background = 2, foreground = 8 }, -- StatusLineTermNC
   })
 
   screen:attach(screen_opts or { rgb = false })

test/functional/terminal/window_split_tab_spec.lua

@@ -22,10 +22,12 @@ describe(':terminal', function()
     -- set the statusline to a constant value because of variables like pid
     -- and current directory and to improve visibility of splits
     api.nvim_set_option_value('statusline', '==========', {})
-    command('highlight StatusLine cterm=NONE')
-    command('highlight StatusLineNC cterm=NONE')
-    command('highlight VertSplit cterm=NONE')
     screen = tt.screen_setup(3)
+    command('highlight StatusLine NONE')
+    command('highlight StatusLineNC NONE')
+    command('highlight StatusLineTerm NONE')
+    command('highlight StatusLineTermNC NONE')
+    command('highlight VertSplit NONE')
   end)
 
   after_each(function()