implement VT

src/Window.zig

@@ -642,7 +642,6 @@ pub fn setCursorRow(self: *Window, row: u16) !void {
 }
 
 pub fn setCursorPos(self: *Window, row: u16, col: u16) !void {
-    if (self.terminal.mode_origin) unreachable; // TODO
     self.terminal.setCursorPos(row, col);
 }
 

src/terminal/ansi.zig

@@ -13,6 +13,8 @@ pub const C0 = enum(u7) {
     HT = 0x09,
     /// Line feed
     LF = 0x0A,
+    /// Vertical Tab
+    VT = 0x0B,
     /// Carriage return
     CR = 0x0D,
 };

src/terminal/stream.zig

@@ -90,6 +90,12 @@ pub fn Stream(comptime Handler: type) type {
                 else
                     log.warn("unimplemented execute: {x}", .{c}),
 
+                // VT is same as LF
+                .VT => if (@hasDecl(T, "linefeed"))
+                    try self.handler.linefeed()
+                else
+                    log.warn("unimplemented execute: {x}", .{c}),
+
                 .CR => if (@hasDecl(T, "carriageReturn"))
                     try self.handler.carriageReturn()
                 else