Add kitty.kak to support kitty integration

rc/extra/kitty.kak

@@ -0,0 +1,24 @@
+hook global KakBegin .* %sh{
+    if [ "$TERM" = "xterm-kitty" -a -z "$TMUX" ]; then
+        echo "
+            alias global new kitty-new
+            alias global focus kitty-focus
+        "
+    fi
+}
+
+define-command -params .. kitty-new %{
+    nop %sh{ kitty @ new-window "$(which kak)" -c $kak_session -e "$*" }
+}
+
+define-command -params ..1 -client-completion \
+    -docstring %{kitty-focus [<client>]: focus the given client
+If no client is passed then the current one is used} \
+    kitty-focus %{ evaluate-commands %sh{
+        if [ $# -eq 1 ]; then
+            printf %s\\n "evaluate-commands -client '$1' focus"
+        else
+            kitty @ focus-window -m=id:$kak_client_env_KITTY_WINDOW_ID
+        fi
+    }
+}