Read file contents and do string replacement on that

[garo]

I have an use case with Terraform that I would want to read a file from system, do a set of string replacements in that file based in variables defined in jsonnet and then base64 encode the resulted string so that I can pass that into the created json.

I suppose that I could do a pull request for a function which loads a file from the filesystem as a string, if it's generally agreed that it's a feature suitable to the stdlib.

[mikedanese]

Can you use 'importstr'?

jsonnet/test_suite/import.jsonnet

Line 27 in 8d00178

std.assertEqual(importstr "lib/some_file.txt", "Hello World!\n") &&

[sparkprime]

Use importstr and then do python-style string formatting, e.g.
(importstr "myfile.txt") % { foo: "bar" } and inside the file, do

I spend most of my time at the %(foo)s.