kitty:daemon: Support optional instance group name

.config/kitty/daemon.sh

@@ -2,6 +2,8 @@
 # SPDX-License-Identifier: MIT
 # Copyright (c) 2025 Julian Prein
 #
+# Usage: kitty-daemon [GROUP_NAME]
+#
 # Daemonize kitty by launching one hidden instance that new invocations can use
 # to create new OS windows. This makes kitty startup a lot faster since all
 # windows can now share a single CPU process and GPU sprite cache. Additionally
@@ -11,6 +13,10 @@
 #
 #     kitty --single-instance
 #
+# You can pass an optional instance-group as first parameter. In that case use:
+#
+#     kitty --single-instance --instance-group <NAME>
+#
 # NOTE: `--start-as hidden` needs kitty 0.42.0 or later.
 
 TMP_DIR="${TMPDIR:-/tmp}/kitty.$USER"
@@ -18,7 +24,8 @@ mkdir -p "$TMP_DIR"
 
 kitty \
 	--single-instance \
+	${1:+--instance-group "$1"} \
 	--start-as hidden \
 	--detach \
 	-o allow_remote_control=socket-only \
-	--listen-on unix:"$TMP_DIR/kitty.sock"
+	--listen-on unix:"$TMP_DIR/kitty${1:+-$1}.sock"

.config/kitty/get_cwd.sh

@@ -2,10 +2,12 @@
 # SPDX-License-Identifier: MIT
 # Copyright (c) 2025 Julian Prein
 #
+# Usage: kitty-cwd [GROUP_NAME]
+#
 # Print the current working directory of the focused kitty window. Returns 4 if
 # none exist or is focused.
 
-socket_path="${TMPDIR:-/tmp}/kitty.$USER/kitty.sock"
+socket_path="${TMPDIR:-/tmp}/kitty.$USER/kitty${1:+-$1}.sock"
 
 # NOTE: the backticks are used for hacky line-continuation, taken from
 #       https://stackoverflow.com/a/7729087/2092762c9