plumb CSI to set cursor style, but haven't implemented any styles

src/Window.zig

@@ -669,3 +669,14 @@ pub fn deviceStatusReport(
         else => log.warn("unimplemented device status req: {}", .{req}),
     }
 }
+
+pub fn setCursorStyle(
+    self: *Window,
+    style: terminal.CursorStyle,
+) !void {
+    _ = self;
+
+    switch (style) {
+        else => log.warn("unimplemented cursor style: {}", .{style}),
+    }
+}

src/terminal/ansi.zig

@@ -58,3 +58,17 @@ pub const DeviceStatusReq = enum(u16) {
     // Non-exhaustive so that @intToEnum never fails for unsupported modes.
     _,
 };
+
+/// Possible cursor styles (ESC [ q)
+pub const CursorStyle = enum(u16) {
+    default = 0,
+    blinking_block = 1,
+    steady_block = 2,
+    blinking_underline = 3,
+    steady_underline = 4,
+    blinking_bar = 5,
+    steady_bar = 6,
+
+    // Non-exhaustive so that @intToEnum never fails for unsupported modes.
+    _,
+};

src/terminal/main.zig

@@ -7,6 +7,7 @@ pub const color = @import("color.zig");
 pub const Terminal = @import("Terminal.zig");
 pub const Parser = @import("Parser.zig");
 pub const Stream = stream.Stream;
+pub const CursorStyle = ansi.CursorStyle;
 pub const DeviceAttributeReq = ansi.DeviceAttributeReq;
 pub const DeviceStatusReq = ansi.DeviceStatusReq;
 pub const Mode = ansi.Mode;

src/terminal/stream.zig

@@ -307,6 +307,19 @@ pub fn Stream(comptime Handler: type) type {
                     },
                 ) else log.warn("unimplemented CSI callback: {}", .{action}),
 
+                // DECSCUSR - Select Cursor Style
+                // TODO: test
+                'q' => if (@hasDecl(T, "setCursorStyle")) try self.handler.setCursorStyle(
+                    switch (action.params.len) {
+                        0 => ansi.CursorStyle.default,
+                        1 => @intToEnum(ansi.CursorStyle, action.params[0]),
+                        else => {
+                            log.warn("invalid set curor style command: {}", .{action});
+                            return;
+                        },
+                    },
+                ) else log.warn("unimplemented CSI callback: {}", .{action}),
+
                 // DECSTBM - Set Top and Bottom Margins
                 // TODO: test
                 'r' => if (@hasDecl(T, "setTopAndBottomMargin")) switch (action.params.len) {