Dry-run mode

[inf17101]

Hi,

I need to know whether there is a dry-run mechanism or a way to find out what variables handlebars-rs will replace and render before it is actually doing the replacement.

Background: I wanted to find a way to have the new size of the rendered output without actually rendering it.

Example dry-run output, just written in text form that you know what I mean:

key1: {{some.variable.path.value1}}
key2: {{some.other.variable.value2}}

will lead to dry-run result:

content of 'some.variable.path.value1' will be used
content of 'some.other.variable.value2' will be used

This I need in a programmatic way to request what will be rendered if I would call a render function.

If there is any existing method to get this desired behavior, please let me know.