Critical fixes for real-world HA configurations:
- Scans ALL .yaml files in /config/ and /config/packages/
- Handles "- platform: template" (list item with dash)
- Properly extracts sensors from "sensors:" blocks
- Handles multiline templates with > operator
- Correct indentation for modern template: format
- Counts sensors correctly from included files
This version will find all 67+ legacy template entities in typical HA setups.
Safe and reliable bash-only implementation:
- Works in SSH add-on without Python
- Uses awk for YAML parsing (reliable and fast)
- Automatic timestamped backups
- Extracts legacy template definitions
- Converts to modern template: syntax
- Removes legacy platform: template blocks
- Adds modern templates to configuration.yaml
- Generates restore script for rollback
- Exit on error for safety (set -e)
- Temp directory cleanup with trap
Fixes all 67 template deprecation warnings without Python dependencies.
