terminal: handle set application keypad mode (both ESC and modes)

src/Surface.zig

@@ -1114,6 +1114,7 @@ pub fn keyCallback(
     // We'll need to know these values here on.
     self.renderer_state.mutex.lock();
     const cursor_key_application = self.io.terminal.modes.cursor_keys;
+    const keypad_key_application = self.io.terminal.modes.keypad_keys;
     self.renderer_state.mutex.unlock();
 
     // Check if we're processing a function key.
@@ -1126,7 +1127,8 @@ pub fn keyCallback(
 
         switch (entry.keypad) {
             .any => {},
-            else => {}, // TODO
+            .normal => if (keypad_key_application) continue,
+            .application => if (!keypad_key_application) continue,
         }
 
         switch (entry.modify_other_keys) {

src/terminal/Terminal.zig

@@ -90,6 +90,7 @@ modes: packed struct {
 
     deccolm: bool = false, // 3,
     deccolm_supported: bool = false, // 40
+    keypad_keys: bool = false, // 66
 
     focus_event: bool = false, // 1004
     mouse_alternate_scroll: bool = true, // 1007

src/terminal/ansi.zig

@@ -88,6 +88,9 @@ pub const Mode = enum(u16) {
     /// mode ?3 is set or unset.
     enable_mode_3 = 40,
 
+    /// DECNKM. Sets application keypad mode if enabled.
+    keypad_keys = 66,
+
     /// "Normal" mouse events: click/release, scroll
     mouse_event_normal = 1000,
 

src/terminal/stream.zig

@@ -765,6 +765,16 @@ pub fn Stream(comptime Handler: type) type {
                     },
                 } else log.warn("unimplemented invokeCharset: {}", .{action}),
 
+                // Set application keypad mode
+                '=' => if (@hasDecl(T, "setMode")) {
+                    try self.handler.setMode(.keypad_keys, true);
+                } else log.warn("unimplemented setMode: {}", .{action}),
+
+                // Reset application keypad mode
+                '>' => if (@hasDecl(T, "setMode")) {
+                    try self.handler.setMode(.keypad_keys, false);
+                } else log.warn("unimplemented setMode: {}", .{action}),
+
                 else => if (@hasDecl(T, "escUnimplemented"))
                     try self.handler.escUnimplemented(action)
                 else

src/termio/Exec.zig

@@ -1193,6 +1193,10 @@ const StreamHandler = struct {
                 self.terminal.modes.cursor_keys = enabled;
             },
 
+            .keypad_keys => {
+                self.terminal.modes.keypad_keys = enabled;
+            },
+
             .insert => {
                 self.terminal.modes.insert = enabled;
             },