Vendor buildifier

[TheButlah]

It would be awesome if the buildifier hook could download buildifier instead of assuming that it is system installed. Buildifier is a go program, so it can simply be wgetted from the github repository with a simple check to determine whether the os is windows, mac, or linux.

[jlebar]

Agree that would be way better.

I'd be happy to take a patch, now that I'm subscribed to updates to this repo. :)

[ScottTodd]

This worked for me, downloading buildifier from the source repo on Windows and Linux using golang bootstrapping from pre-commit 3.0.0+ (https://pre-commit.com/#golang):

-   repo: local
    hooks:
    -   id: buildifier
        name: Run buildifier
        entry: buildifier
        language: golang
        additional_dependencies: ["github.com/bazelbuild/buildtools/buildifier@1429e15ae755a6762d0edf9198062dc6ed04408d"]
        files: '^(.*/)?(BUILD\.bazel|BUILD|WORKSPACE|WORKSPACE\.bazel|WORKSPACE\.bzlmod|MODULE\.bazel)$|\.BUILD$|\.bzl$'
        language_version: "1.16"

• could also use the @latest version, but semvar tags like v7.1.2 in the buildtools repo (https://github.com/bazelbuild/buildtools/tags) don't seem to work with go install (maybe related to no versions showing up on https://pkg.go.dev/github.com/bazelbuild/buildtools/buildifier?tab=versions, idk)
• I had to pin the language_version since I had an older version of go installed on my system that didn't support go install