added wayshell framework

sdgos/wayshell/modules/focused.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+#===============================================================================
+# Focused Module — Detect client focus/unfocus events
+#===============================================================================
+# Description:
+#   Subscribes to `mmsg watch focusing-client` and emits JSON when the focused
+#   client changes. Tracks the previously focused app_id to emit unfocused
+#   events.
+#
+# Output format (JSON lines):
+#   {"app_id":"firefox","state":"focused"}
+#   {"app_id":"firefox","state":"unfocused"}
+#   {"app_id":"com.mitchellh.ghostty","state":"focused"}
+#
+# Dependencies:
+#   - jq
+#   - mmsg
+#===============================================================================
+
+PREV_APP_ID=""
+
+if ! command -v mmsg &>/dev/null || ! command -v jq &>/dev/null; then
+    echo "focused.sh: mmsg and jq are required" >&2
+    exit 1
+fi
+
+while read -r line; do
+    app_id=$(jq -r '.appid // empty' <<< "$line" 2>/dev/null)
+
+    if [[ -z "$app_id" || "$app_id" == "null" ]]; then
+        if [[ -n "$PREV_APP_ID" ]]; then
+            echo "{\"app_id\":\"$PREV_APP_ID\",\"state\":\"unfocused\"}"
+            PREV_APP_ID=""
+        fi
+        continue
+    fi
+
+    if [[ "$app_id" != "$PREV_APP_ID" ]]; then
+        if [[ -n "$PREV_APP_ID" ]]; then
+            echo "{\"app_id\":\"$PREV_APP_ID\",\"state\":\"unfocused\"}"
+        fi
+        echo "{\"app_id\":\"$app_id\",\"state\":\"focused\"}"
+        PREV_APP_ID="$app_id"
+    fi
+done < <(mmsg watch focusing-client 2>/dev/null)