mod(terminal): add writer interface implementation

src/terminal.zig

@@ -55,6 +55,21 @@ pub fn write(buf: []const u8) !usize {
     return try std.posix.write(std.posix.STDIN_FILENO, buf);
 }
 
+fn contextWrite(context: @This(), data: []const u8) anyerror!usize {
+    _ = context;
+    return try std.posix.write(std.posix.STDOUT_FILENO, data);
+}
+
+const Writer = std.io.Writer(
+    @This(),
+    anyerror,
+    contextWrite,
+);
+
+pub fn writer() Writer {
+    return .{ .context = .{} };
+}
+
 pub fn setCursorPosition(pos: Position) !void {
     var buf: [64]u8 = undefined;
     const value = try std.fmt.bufPrint(&buf, "\x1b[{d};{d}H", .{ pos.row, pos.col });