This is the second of a series of posts about jj. The first is A jj plugin for bash-it.

At Netflix, we use the spotless linter. The main gripe I have with it is that it’s not integrated with any of our IDEs. In contrast, in Go, gofmt is integrated with all my IDEs and linting happens as I program; with spotless I have to remember to run ./gradlew spotlessApply before I push my changes, or else my PR’s build will break when it gets to the lint check step.

When I’m working with jj rev chains, it’s annoying to jj edit <rev> && ./gradlew spotlessApply each and every rev before sending them all off to be CI/CD’d with jj git push --all.

So, I made this little script. I hope you’ll find it useful too:

#!/bin/bash
set -e
for i in `jj log -r "mutable()" --no-graph -T 'change_id ++ "\n"' | tail -r`; do
  jj edit $i
  ./gradlew spotlessApply
  ./gradlew spotbugsMain
done
jj log

Of course, sub out the for loop with whatever you want to do at each rev.

It makes use of jj’s fantastic templating language to walk the graph from oldgest to newest change, linting as it goes.