Post rendering templates

I’m looking to add text before the output of each template and partial
to
show the following:

/path/to/erb/file

or

document.write … if it’s a javascript file.

If I’m using tilt I also use templates for those notices (for
coffeescript
etc…)

i’ve found a gem for rails 2 that did that, but it doesn’t work anymore.

Is there a after_render hook in tilt that I could use.

This is just for development mode.

I’ve found what i’m looking for: