feat(config): add default_steady/default_blinking cursor styles

Adds two cursor_style values that only touch shape reset (CSI 0 SP q)
and blink mode (CSI ? 12 h/l), instead of selecting one of the fixed
DECSCUSR shapes. Some terminals - Windows Terminal among them - offer
cursor shapes with no DECSCUSR equivalent (vintage/thick underscore,
double underscore, empty box). Existing cursor_style values always
override those with block/underline/bar, but default_steady and
default_blinking let the terminal profile's own shape stand while
still controlling steady vs. blinking.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

src/terminal/writer.go

@@ -152,6 +152,14 @@ const (
 	BlinkingBar       = "blinking_bar"
 	SteadyBar         = "steady_bar"
 
+	// DefaultSteady and DefaultBlinking reset DECSCUSR to the terminal's own
+	// default shape (CSI 0 SP q) and only toggle blink (CSI ? 12 h/l), so
+	// terminal-specific shapes DECSCUSR can't select - Windows Terminal's
+	// vintage, double-underscore and empty-box cursors among them - stay
+	// under the user's terminal profile setting instead of being overridden.
+	DefaultSteady   = "default_steady"
+	DefaultBlinking = "default_blinking"
+
 	ANCHOR = "ANCHOR"
 	BG     = "BG"
 	FG     = "FG"
@@ -395,6 +403,13 @@ func SetCursorStyle(style string) string {
 		return ""
 	}
 
+	switch style {
+	case DefaultSteady:
+		return fmt.Sprintf(formats.Escape, "\x1b[0 q\x1b[?12l")
+	case DefaultBlinking:
+		return fmt.Sprintf(formats.Escape, "\x1b[0 q\x1b[?12h")
+	}
+
 	code, ok := decscusrCodes[style]
 	if !ok {
 		return ""

src/terminal/writer_test.go

@@ -601,6 +601,18 @@ func TestSetCursorStyle(t *testing.T) {
 			Style:    "not-a-style",
 			Expected: "",
 		},
+		{
+			Case:     "Default steady, generic shell",
+			Shell:    shell.GENERIC,
+			Style:    DefaultSteady,
+			Expected: "\x1b[0 q\x1b[?12l",
+		},
+		{
+			Case:     "Default blinking wrapped for zsh",
+			Shell:    shell.ZSH,
+			Style:    DefaultBlinking,
+			Expected: "%{\x1b[0 q\x1b[?12h%}",
+		},
 		{
 			Case:     "Plain mode renders nothing",
 			Shell:    shell.GENERIC,

themes/schema.json

@@ -5481,7 +5481,9 @@
         "blinking_underline",
         "steady_underline",
         "blinking_bar",
-        "steady_bar"
+        "steady_bar",
+        "default_steady",
+        "default_blinking"
       ]
     },
     "enable_cursor_positioning": {

website/docs/configuration/general.mdx

@@ -130,7 +130,7 @@ For example, the following is a valid `--config` flag:
 | --------------------------- | ---------------- | ------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `final_space`               | `boolean`        |         | when true adds a space at the end of the prompt                                                                                                                                                                                                                              |
 | `pwd`                       | `string`         |         | notify terminal of current working directory, values can be `osc99`, `osc7` or `osc51` depending on your terminal. Supports [templates][templates]                                                                                                                           |
-| `cursor_style`              | `string`         |         | set the cursor's shape/blink state at the start of the prompt using a DECSCUSR sequence, values can be `blinking_block`, `steady_block`, `blinking_underline`, `steady_underline`, `blinking_bar` or `steady_bar`. Supports [templates][templates], e.g. to vary by `.Env.POSH_VI_MODE` (set by the [`vimode`][vimode] segment's shell hooks) |
+| `cursor_style`              | `string`         |         | set the cursor's shape/blink state at the start of the prompt using a DECSCUSR sequence, values can be `blinking_block`, `steady_block`, `blinking_underline`, `steady_underline`, `blinking_bar`, `steady_bar`, `default_steady` or `default_blinking` (the latter two only reset shape/blink, leaving terminal-specific cursors like Windows Terminal's vintage, double underscore or empty box shapes as configured in the terminal profile). Supports [templates][templates], e.g. to vary by `.Env.POSH_VI_MODE` (set by the [`vimode`][vimode] segment's shell hooks) |
 | `terminal_background`       | `string`         |         | [color][colors] - terminal background color, set to your terminal's background color when you notice black elements in Windows Terminal or the Visual Studio Code integrated terminal                                                                                        |
 | `accent_color`              | `string`         |         | [color][colors] - accent color, used as a fallback when the `accent` [color][accent] is not supported                                                                                                                                                                        |
 | `var`                       | `map[string]any` |         | config variables to use in [templates][templates]. Can be any value                                                                                                                                                                                                          |