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Spotless Gradle IDE integrations

Thanks to spotlessApply, it is not necessary for Spotless and your IDE to agree on formatting - you can always run spotless at the end to fix things up. But if you want them to agree, we have plugins for:

How to add an IDE

The Spotless plugin for Gradle accepts a command-line argument -PspotlessIdeHook=${ABSOLUTE_PATH_TO_FILE}. In this mode, spotlessCheck is disabled, and spotlessApply will apply only to that one file. Because it already knows the absolute path of the only file you are asking about, it is able to run much faster than a normal invocation of spotlessApply. By passing in a comma separated list of absolute file paths, you can format multiple files in one invocation -PspotlessIdeHook=${ABSOLUTE_PATH_TO_FILE_A},${ABSOLUTE_PATH_TO_FILE_B}.

For extra flexibility, you can add -PspotlessIdeHookUseStdIn, and Spotless will read the file content from stdin. This allows you to send the content of a dirty editor buffer without writing to a file. You can also add -PspotlessIdeHookUseStdOut, and Spotless will return the formatted content on stdout rather than writing it to a file (you should also add --quiet to make sure Gradle doesn't dump logging info into stdout).

In all of these cases, Spotless will send useful status information on stderr:

  • if stderr starts with IS DIRTY, then the file was dirty, and stdout contains its full formatted contents
    • in every other case, stdout will be empty / the file will be unchanged because there is nothing to change
  • if stderr starts with IS CLEAN, then the file is already clean
  • if stderr starts with DID NOT CONVERGE, then the formatter is misbehaving, and the rest of stderr has useful diagnostic info (e.g. spotlessDiagnose for padded cell)
  • if stderr is empty, then the file is not being formatted by spotless (not included in any target)
  • if stderr is anything else, then it is the stacktrace of whatever went wrong

See the VS Code extension above for a working example, or the PR where this feature was added for more context.