Buildifier does not support f-strings

[cbarrete]

Buck2 supports f-string (although Bazel does not, at least yet), so it would be nice if buildifier did not consider them invalid syntax.

Currently, running it over:

name = "Cédric"
print(f"Hello, {name}!")

gives

> buildifier asdf.bzl
asdf.bzl:2:24: syntax error near "Hello, {name}!"
asdf.bzl # reformat

It seems like this could be implemented quite easily similarly to raw strings, is this correct?

[vladmos]

That's correct, however the linter check for unused variables also need to be updated (e.g. the following code shoudln't issue warnings):

def f():
    foo = 'bar'
    return f'{foo}'

[aryandutt]

It looks like a good first issue, can I work on it?