feat(defaults): use ripgrep (rg) for 'grepprg' if available

runtime/lua/nvim/health.lua

@@ -383,6 +383,19 @@ local function check_terminal()
   end
 end
 
+local function check_external_tools()
+  health.start('External Tools')
+
+  if vim.fn.executable('rg') == 1 then
+    local rg = vim.fn.exepath('rg')
+    local cmd = 'rg -V'
+    local out = vim.fn.system(vim.fn.split(cmd))
+    health.ok(('%s (%s)'):format(vim.trim(out), rg))
+  else
+    health.warn('ripgrep not available')
+  end
+end
+
 function M.check()
   check_config()
   check_runtime()
@@ -390,6 +403,7 @@ function M.check()
   check_rplugin_manifest()
   check_terminal()
   check_tmux()
+  check_external_tools()
 end
 
 return M

runtime/lua/vim/_defaults.lua

@@ -496,3 +496,11 @@ if tty then
     end
   end
 end
+
+--- Default 'grepprg' to ripgrep if available.
+if vim.fn.executable('rg') == 1 then
+  -- Match :grep default, otherwise rg searches cwd by default
+  -- Use -uuu to make ripgrep not do its default filtering
+  vim.o.grepprg = 'rg --vimgrep -uuu $* ' .. (vim.fn.has('unix') == 1 and '/dev/null' or 'nul')
+  vim.o.grepformat = '%f:%l:%c:%m'
+end

runtime/lua/vim/_meta/options.lua

@@ -2625,6 +2625,8 @@ vim.go.gd = vim.go.gdefault
 --- This is a scanf-like string that uses the same format as the
 --- 'errorformat' option: see `errorformat`.
 ---
+--- If ripgrep ('grepprg') is available, this option defaults to `%f:%l:%c:%m`.
+---
 --- @type string
 vim.o.grepformat = "%f:%l:%m,%f:%l%m,%f  %l%m"
 vim.o.gfm = vim.o.grepformat
@@ -2649,6 +2651,16 @@ vim.go.gfm = vim.go.grepformat
 --- apply equally to 'grepprg'.
 --- This option cannot be set from a `modeline` or in the `sandbox`, for
 --- security reasons.
+--- This option defaults to:
+--- - `rg --vimgrep -uuu $* ...` if ripgrep is available (`:checkhealth`),
+--- - `grep -n $* /dev/null` on Unix,
+--- - `findstr /n $* nul` on Windows.
+--- Ripgrep can perform additional filtering such as using .gitignore rules
+--- and skipping hidden or binary files. This is disabled by default (see the -u option)
+--- to more closely match the behaviour of standard grep.
+--- You can make ripgrep match Vim's case handling using the
+--- -i/--ignore-case and -S/--smart-case options.
+--- An `OptionSet` autocmd can be used to set it up to match automatically.
 ---
 --- @type string
 vim.o.grepprg = "grep -n $* /dev/null"