Supporting buf format

[andrewparmet]

The Buf tool for protobuf recently added the buf format command. Buf is currently published with a download link on their GitHub release page and to DockerHub. They have an open issue to publish binaries to Maven Central.

Is there any precedent for adding a binary tool like this as a formatter? It could be supported with a custom Ivy repository (for Gradle, at least) if that's something you'd be willing to incorporate.

[nedtwigg]

Yes, we have support for two binary tools in Spotless right now, happy to add another one.

spotless/lib/src/main/java/com/diffplug/spotless/python/BlackStep.java

Lines 65 to 70 in 21b089f

	String exeAbsPath = ForeignExe.nameAndVersion("black", version)
	.pathToExe(pathToExe)
	.versionRegex(Pattern.compile("(?:black, version|black,|version) (\\S*)"))
	.fixCantFind("Try running {@code pip install black=={version}}, or else tell Spotless where it is with {@code black().pathToExe('path/to/executable')}" + trackingIssue)
	.fixWrongVersion("Try running {@code pip install --force-reinstall black=={version}}, or else specify {@code black('{versionFound}')} to Spotless" + trackingIssue)
	.confirmVersionAndGetAbsolutePath();

spotless/lib/src/main/java/com/diffplug/spotless/cpp/ClangFormatStep.java

Lines 70 to 84 in 21b089f

	String howToInstall = "" +
	"You can download clang-format from https://releases.llvm.org and " +
	"then point Spotless to it with {@code pathToExe('/path/to/clang-format')} " +
	"or you can use your platform's package manager:" +
	"\n win: choco install llvm --version {version} (try dropping version if it fails)" +
	"\n mac: brew install clang-format (TODO: how to specify version?)" +
	"\n linux: apt install clang-format (try clang-format-{version} with dropped minor versions)" +
	"\n github issue to handle this better: https://github.com/diffplug/spotless/issues/673";
	String exeAbsPath = ForeignExe.nameAndVersion("clang-format", version)
	.pathToExe(pathToExe)
	.fixCantFind(howToInstall)
	.fixWrongVersion(
	"You can tell Spotless to use the version you already have with {@code clangFormat('{versionFound}')}" +
	"or you can download the currently specified version, {version}.\n" + howToInstall)
	.confirmVersionAndGetAbsolutePath();

I'm fine with making installation of the buf tool a problem for the user (that's how we handle black and clang currently), or it can be automatic.