Merge pull request #2109 from edmz/block_hollow

Config: cursor-style can bet set to block_hollow

src/config/Config.zig

@@ -325,6 +325,7 @@ palette: Palette = .{},
 ///   * `block`
 ///   * `bar`
 ///   * `underline`
+///   * `block_hollow`
 ///
 @"cursor-style": terminal.CursorStyle = .block,
 

src/renderer/cursor.zig

@@ -16,6 +16,7 @@ pub const Style = enum {
         return switch (term) {
             .bar => .bar,
             .block => .block,
+            .block_hollow => .block_hollow,
             .underline => .underline,
         };
     }

src/terminal/Screen.zig

@@ -140,7 +140,18 @@ pub const Cursor = struct {
 /// The visual style of the cursor. Whether or not it blinks
 /// is determined by mode 12 (modes.zig). This mode is synchronized
 /// with CSI q, the same as xterm.
-pub const CursorStyle = enum { bar, block, underline };
+pub const CursorStyle = enum {
+    bar, // DECSCUSR 5, 6
+    block, // DECSCUSR 1, 2
+    underline, // DECSCUSR 3, 4
+
+    /// The cursor styles below aren't known by DESCUSR and are custom
+    /// implemented in Ghostty. They are reported as some standard style
+    /// if requested, though.
+    /// Hollow block cursor. This is a block cursor with the center empty.
+    /// Reported as DECSCUSR 1 or 2 (block).
+    block_hollow,
+};
 
 /// Saved cursor state.
 pub const SavedCursor = struct {

src/termio/stream_handler.zig

@@ -210,6 +210,10 @@ pub const StreamHandler = struct {
                             .block => if (blink) 1 else 2,
                             .underline => if (blink) 3 else 4,
                             .bar => if (blink) 5 else 6,
+
+                            // Below here, the cursor styles aren't represented by
+                            // DECSCUSR so we map it to some other style.
+                            .block_hollow => if (blink) 1 else 2,
                         };
                         try writer.print("{d} q", .{style});
                     },