feat(niri): giving niri a test drive

scripts/bin/spawn-or-focus.sh

@@ -0,0 +1,51 @@
+# Check if at least one argument is provided
+if [ $# -lt 1 ]; then
+  notify-send -t 5000 "Usage: spawn-or-focus.sh <APP_CLASS> [APP_CMD]"
+  exit 1
+fi
+
+APP_CLASS="$1"   # Application's app_id (e.g. firefox)
+APP_CMD="${2:-}" # Optional: Command to run the application
+
+# Get the ID of the currently focused window
+FOCUSED_ID=$(niri msg -j focused-window | jq -r '.id')
+
+# Find windows matching the app class and read them into an array
+readarray -t MATCHING_IDS < <(
+  niri msg -j windows |
+    jq -r --arg app_class "$APP_CLASS" '
+      .[]
+      | select(.app_id | ascii_downcase | contains($app_class | ascii_downcase))
+      | .id
+    '
+)
+
+# Launch the app and exit the script if the number of matching windows is zero
+if [ ${#MATCHING_IDS[@]} -eq 0 ]; then
+  # Use the app class as the command if no app command is supplied
+  if [ -z "$APP_CMD" ]; then
+    APP_CMD="$APP_CLASS"
+  fi
+  "$APP_CMD" &
+  exit 0
+fi
+
+# Find the array index of the currently focused window
+CURRENT_INDEX=-1
+for INDEX in "${!MATCHING_IDS[@]}"; do
+  if [ "${MATCHING_IDS[$INDEX]}" = "$FOCUSED_ID" ]; then
+    CURRENT_INDEX=$INDEX
+    break
+  fi
+done
+
+# Cycle to the next matching array index if the currently focused ID was found
+# in the array, otherwise set the target index to zero
+if [ "$CURRENT_INDEX" -ge 0 ]; then
+  TARGET_INDEX=$(((CURRENT_INDEX + 1) % ${#MATCHING_IDS[@]}))
+else
+  TARGET_INDEX=0
+fi
+
+# Switch focus to the target window stored in the array
+niri msg action focus-window --id "${MATCHING_IDS[$TARGET_INDEX]}"