Support conventional var escaping

[alexey-vostrikov]

Such as: single quotation, and backlsash behind dollar sign
i.e. '${VAR}' or \${VAR} sould not be substituted

[icy]

Hi @alexey-vostrikov,

Such as: single quotation, and backlsash behind dollar sign i.e. '${VAR}' or ${VAR} sould not be substituted

Thanks for your suggestion. This feature requires to look into the context of the variable, that means to have some custom lexer/parser like this https://github.com/a8m/envsubst/tree/master/parse . When some escape form is supported, it would need more than that, e.g., $$${VAR}, $$$${VAR},..

Though this is quite possible to have new feature, I'd rather keep my tool simple (without a huge refactoring): It simply deals with normal regular expression search-replace task. One simple thing I can do is to add a limited-context form, ie, ${{VAR}}, but this would make the use a tool lock-in.

If you know how this is done with a minimal effort, I'm more than happy to hear from you.

I have a few todos relevant to your request

• Update README with new section How it works
• Consider to add new form ${{VAR}} (which becomes ${VAR}) or similar simple form.

Thanks a lot.