Add ability to find file/get content of a file inside generator/editor archive that is executing

[tanya-coding]

Example use case: editor needs to prepend each file in a project with some predefined content (e.g. license comment). Editor would have a file with license comment content but there is no way to get content of that file without first executing project.copyEditorBackingFileOrFailToDestination and then at the end calling project.deleteFile to clean up (specific example: https://github.com/atomist/rug-rugs/blob/license/.atomist/editors/AddLicense.ts#L85)

It would be helpful to be able to find file and get content of a file inside the generator/editor that is being executed not just inside the project it's executing on.

[James Carnegie]

licensing-editors - which for some reason defunct, did this:

let licenseFile = project.backingArchiveProject().findFile(licenseFileName)`

Does this work for you?

[tanya-coding]

Yep, that works! cc: @ddgenome