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#!/usr/bin/env bash
# ==================================================
# KoolDots (2026)
# Project URL: https://github.com/LinuxBeginnings
# License: GNU GPLv3
# SPDX-License-Identifier: GPL-3.0-or-later
# ==================================================
##################################################################
# #
# #
# TAK_0'S Per-Window-Switch #
# #
# #
# #
# Just a little script that I made to switch keyboard layouts #
# per-window instead of global switching for the more #
# smooth and comfortable workflow. #
# #
##################################################################
MAP_FILE="$HOME/.cache/kb_layout_per_window"
ICON="${XDG_CONFIG_HOME:-$HOME/.config}/swaync/images/ja.png"
SCRIPT_NAME="$(basename "$0")"
SCRIPT_PATH="$(readlink -f "$0")"
# Detect active Hyprland config mode
config_home="${XDG_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}}"
hypr_dir="$config_home/hypr"
lua_entry="$hypr_dir/hyprland.lua"
legacy_lua_entry="$config_home/hyprland.lua"
if [[ -f "$lua_entry" || -f "$legacy_lua_entry" ]]; then
hypr_config_mode="lua"
else
hypr_config_mode="conf"
fi
# Ensure map file exists
touch "$MAP_FILE"
# Function to get layouts from config files
get_layouts() {
local layouts=""
if [[ "$hypr_config_mode" == "lua" ]]; then
local lua_user="$hypr_dir/UserConfigs/user_settings.lua"
local lua_sys="$hypr_dir/configs/system_settings.lua"
local lua_legacy_sys="$hypr_dir/UserConfigs/system_settings.lua"
local lua_pristine_sys="$hypr_dir/lua/settings.lua"
if [[ -f "$lua_user" ]] && grep -q 'kb_layout' "$lua_user" 2>/dev/null; then
layouts=$(grep 'kb_layout' "$lua_user" | sed -n 's/.*kb_layout\s*=\s*"\([^"]*\)".*/\1/p' | head -n1)
elif [[ -f "$lua_sys" ]] && grep -q 'kb_layout' "$lua_sys" 2>/dev/null; then
layouts=$(grep 'kb_layout' "$lua_sys" | sed -n 's/.*kb_layout\s*=\s*"\([^"]*\)".*/\1/p' | head -n1)
elif [[ -f "$lua_legacy_sys" ]] && grep -q 'kb_layout' "$lua_legacy_sys" 2>/dev/null; then
layouts=$(grep 'kb_layout' "$lua_legacy_sys" | sed -n 's/.*kb_layout\s*=\s*"\([^"]*\)".*/\1/p' | head -n1)
elif [[ -f "$lua_pristine_sys" ]] && grep -q 'kb_layout' "$lua_pristine_sys" 2>/dev/null; then
layouts=$(grep 'kb_layout' "$lua_pristine_sys" | sed -n 's/.*kb_layout\s*=\s*"\([^"]*\)".*/\1/p' | head -n1)
fi
else
local conf_user="$hypr_dir/UserConfigs/UserSettings.conf"
local conf_sys="$hypr_dir/configs/SystemSettings.conf"
if [[ -f "$conf_user" ]] && grep -q 'kb_layout' "$conf_user" 2>/dev/null; then
layouts=$(grep 'kb_layout' "$conf_user" | cut -d '=' -f2 | tr -d '[:space:]' | head -n1)
elif [[ -f "$conf_sys" ]] && grep -q 'kb_layout' "$conf_sys" 2>/dev/null; then
layouts=$(grep 'kb_layout' "$conf_sys" | cut -d '=' -f2 | tr -d '[:space:]' | head -n1)
fi
fi
echo "$layouts" | tr ',' ' '
}
raw_layouts=$(get_layouts)
if [[ -z "$raw_layouts" ]]; then
echo "Error: cannot find kb_layout in configuration files." >&2
exit 1
fi
kb_layouts=($raw_layouts)
count=${#kb_layouts[@]}
# Get current active window ID
get_win() {
hyprctl activewindow -j | jq -r '.address // .id'
}
# Get available keyboards
get_keyboards() {
hyprctl devices -j | jq -r '.keyboards[].name'
}
# Save window-specific layout
save_map() {
local W=$1 L=$2
grep -v "^${W}:" "$MAP_FILE" > "$MAP_FILE.tmp" 2>/dev/null
echo "${W}:${L}" >> "$MAP_FILE.tmp"
mv "$MAP_FILE.tmp" "$MAP_FILE"
}
# Load layout for window (fallback to default)
load_map() {
local W=$1
local E
E=$(grep "^${W}:" "$MAP_FILE" 2>/dev/null)
[[ -n "$E" ]] && echo "${E#*:}" || echo "${kb_layouts[0]}"
}
# Switch layout for all keyboards to layout index
do_switch() {
local IDX=$1
for kb in $(get_keyboards); do
hyprctl switchxkblayout "$kb" "$IDX" >/dev/null 2>&1
done
}
# Toggle layout for current window only
cmd_toggle() {
local W=$(get_win)
[[ -z "$W" || "$W" == "null" ]] && return
local CUR=$(load_map "$W")
local i=0
local NEXT
for idx in "${!kb_layouts[@]}"; do
if [[ "${kb_layouts[idx]}" == "$CUR" ]]; then
i=$idx
break
fi
done
NEXT=$(( (i+1) % count ))
do_switch "$NEXT"
save_map "$W" "${kb_layouts[NEXT]}"
notify-send -u low -i "$ICON" "kb_layout: ${kb_layouts[NEXT]}"
}
# Restore layout on focus
cmd_restore() {
local W=$(get_win)
[[ -z "$W" || "$W" == "null" ]] && return
local LAY=$(load_map "$W")
for idx in "${!kb_layouts[@]}"; do
if [[ "${kb_layouts[idx]}" == "$LAY" ]]; then
do_switch "$idx"
break
fi
done
}
# Listen to focus events and restore window-specific layouts
subscribe() {
local SOCKET2="$XDG_RUNTIME_DIR/hypr/$HYPRLAND_INSTANCE_SIGNATURE/.socket2.sock"
if [[ ! -S "$SOCKET2" ]]; then
# Fallback if HYPRLAND_INSTANCE_SIGNATURE is not set correctly in this subshell
local sig=$(hyprctl instances -j | jq -r '.[0].instance' 2>/dev/null)
SOCKET2="$XDG_RUNTIME_DIR/hypr/$sig/.socket2.sock"
fi
[[ -S "$SOCKET2" ]] || {
echo "Error: Hyprland socket not found." >&2
exit 1
}
socat -u UNIX-CONNECT:"$SOCKET2" - | while read -r line; do
if [[ "$line" =~ ^activewindow ]]; then
cmd_restore
fi
done
}
# CLI
case "$1" in
--listener)
subscribe
;;
toggle|"")
# Ensure only one listener
if ! pgrep -f "$SCRIPT_NAME.*--listener" >/dev/null; then
"$SCRIPT_PATH" --listener &
fi
cmd_toggle
;;
*)
echo "Usage: $SCRIPT_NAME [toggle]" >&2; exit 1
;;
esac
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