--rustfmt_bindings doesn't work with printing bindings to stdout

[fitzgen]

This produces pretty code in output.rs:

$ bindgen input.h --rustfmt-bindings -o output.rs

This does not print pretty code to stdout:

$ bindgen input.h --rustfmt-bindings

See the rustfmt_generated_file function in src/lib.rs for where we currently run rustfmt on generated files. We need to have a version of this for when we are printing to stdout that writes the unformatted bindings to a child rustfmt's stdin, and then pipes the child's stdout to our stdout. We actually have something pretty similar to this in tests/tests.rs as well in the rustfmt function there.

[highfive]

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[myromeu]

Can I pick up this?

[fitzgen]

@myromeu all yours! For the record, you can ask the @highfive bot to automatically assign you:

If you intend to work on this issue, then add @highfive: assign me to your comment, and I'll assign this to you. 😄

Let me know if you have an questions or anything!

[fitzgen]

@myromeu making any progress? Anything I can help with?

[fitzgen]

Fixed in #1042