Speedup keybindings show by using caching

Co-authored-by: @davidwinter

bin/omarchy-menu-keybindings

@@ -3,6 +3,69 @@
 # A script to display Hyprland keybindings defined in your configuration
 # using walker for an interactive search menu.
 
+declare -A KEYCODE_SYM_MAP
+
+build_keymap_cache() {
+  local keymap
+  keymap="$(xkbcli compile-keymap)" || {
+    echo "Failed to compile keymap" >&2
+    return 1
+  }
+
+  while IFS=, read -r code sym; do
+    [[ -z "$code" || -z "$sym" ]] && continue
+    KEYCODE_SYM_MAP["$code"]="$sym"
+  done < <(
+    awk '
+      BEGIN { sec = "" }
+      /xkb_keycodes/ { sec = "codes"; next }
+      /xkb_symbols/  { sec = "syms";  next }
+      sec == "codes" {
+        if (match($0, /<([A-Za-z0-9_]+)>\s*=\s*([0-9]+)\s*;/, m)) code_by_name[m[1]] = m[2]
+      }
+      sec == "syms" {
+        if (match($0, /key\s*<([A-Za-z0-9_]+)>\s*\{\s*\[\s*([^, \]]+)/, m)) sym_by_name[m[1]] = m[2]
+      }
+      END {
+        for (k in code_by_name) {
+          c = code_by_name[k]
+          s = sym_by_name[k]
+          if (c != "" && s != "" && s != "NoSymbol") print c "," s
+        }
+      }
+    ' <<<"$keymap"
+  )
+}
+
+lookup_keycode_cached() {
+  printf '%s\n' "${KEYCODE_SYM_MAP[$1]}"
+}
+
+parse_keycodes() {
+  local start end elapsed
+  [[ "${DEBUG:-0}" == "1" ]] && start=$(date +%s.%N)
+  while IFS= read -r line; do
+    if [[ "$line" =~ code:([0-9]+) ]]; then
+      code="${BASH_REMATCH[1]}"
+      symbol=$(lookup_keycode_cached "$code" "$XKB_KEYMAP_CACHE")
+      echo "${line/code:${code}/$symbol}"
+    else
+      echo "$line"
+    fi
+  done
+
+  if [[ "$DEBUG" == "1" ]]; then
+    end=$(date +%s.%N)
+    # fall back to awk if bc is missing
+    if command -v bc >/dev/null 2>&1; then
+      elapsed=$(echo "$end - $start" | bc)
+    else
+      elapsed=$(awk -v s="$start" -v e="$end" 'BEGIN{printf "%.6f", (e - s)}')
+    fi
+    echo "[DEBUG] parse_keycodes elapsed: ${elapsed}s" >&2
+  fi
+}
+
 # Fetch dynamic keybindings from Hyprland
 #
 # Also do some pre-processing:
@@ -19,21 +82,7 @@ dynamic_bindings() {
       -e 's,uwsm app -- ,,' \
       -e 's/@0//' \
       -e 's/,@/,code:/' \
-      -e 's/,code:10,/,1,/' \
-      -e 's/,code:11,/,2,/' \
-      -e 's/,code:12,/,3,/' \
-      -e 's/,code:13,/,4,/' \
-      -e 's/,code:14,/,5,/' \
-      -e 's/,code:15,/,6,/' \
-      -e 's/,code:16,/,7,/' \
-      -e 's/,code:17,/,8,/' \
-      -e 's/,code:18,/,9,/' \
-      -e 's/,code:19,/,0,/' \
-      -e 's/,code:20,/,-,/' \
-      -e 's/,code:21,/,=,/' \
       -e 's/^0,/,/' \
-      -e 's/,mouse:272,/,MOUSE LEFT,/' \
-      -e 's/,mouse:273,/,MOUSE RIGHT,/' \
       -e 's/^1,/SHIFT,/' \
       -e 's/^4,/CTRL,/' \
       -e 's/^5,/SHIFT CTRL,/' \
@@ -100,7 +149,10 @@ parse_bindings() {
 monitor_height=$(hyprctl monitors -j | jq -r '.[] | select(.focused == true) | .height')
 menu_height=$((monitor_height * 40 / 100))
 
+build_keymap_cache
+
 dynamic_bindings |
   sort -u |
+  parse_keycodes |
   parse_bindings |
   walker --dmenu --theme keybindings -p 'Keybindings' -w 800 -h "$menu_height"