Autodetect template files

[mike-whittaker-work]

Is this feature request related to a new rule or cfn-lint capabilities?

rules

Describe the feature you'd like to request

If a template file [AWSTemplateFormatVersion: '2010-09-09'] is run through cfn-lint as a normal file, it results in
E1001: 'Resources' is a required property (despite having a Resources: section)

But if the same filename is given after a -t commandline switch, the file is processed normally.

So why not at least add an option to autodetect template files ?

Describe the solution you'd like

A commandline option (eg --detect_template) to cause input files from the filename list to be checked for the "AWSTemplateFormatVersion: '2010-09-09' property, and switch into template mode if so.

Additional context

No response

Is this something that you'd be interested in working on?

• 👋 I may be able to implement this feature request

Would this feature include a breaking change?

• ⚠️ This feature might incur a breaking change