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71 lines
2.9 KiB
Markdown
71 lines
2.9 KiB
Markdown
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# sbt cheatsheet
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This document contains various references and notes about sbt build definition.
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One of the motivation for this document is that the
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[official sbt documentation](https://www.scala-sbt.org/1.x/docs/index.html) is
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not very informative.
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### Resources
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- [Official sbt documentation](https://www.scala-sbt.org/1.x/docs/index.html)
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- [sbt.Keys](https://github.com/sbt/sbt/blob/1.10.x/main/src/main/scala/sbt/Keys.scala)
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defines all the tasks and settings keys, including their documentation.
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### Logging
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- Get reference to the logger via `streams.value.log`.
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- Log and error via `streams.value.log.error("My error")`
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- Note that this will not cause the task to fail, this will only log an
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`[error]` message. IF you want to fail a task, refer to
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[Fail a task](#fail-a-task).
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### Fail a task
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- Simply throw a `java.lang.RuntimeException`.
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- This will always work - it will crash the whole sbt process with the
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RuntimeException. But it is not the official recommended way.
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### Inspect tasks and settings
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- `inspect tree project/assembly`
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- This prints all the tasks and settings that will be executed when
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`project / assembly` is run.
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- It may be helpful to increase the width of the ASCI tree with
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`set asciiGraphWidth := 150`.
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- See `help inspect`.
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## See all the transitive dependencies
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- `print dependencyTree`
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- This shows all the transitive dependencies for the default `Compile` scope.
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- `print Test/dependencyTree`
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- This show all the transitive dependencies for the `Test` scope.
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### Debugging sbt tasks
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- There is `--jvm-debug` cmd line option to sbt which allows to attach a
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debugger to the sbt process.
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- This option is not very handy, as you will still not be able to add a
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breakpoint to various task definitions inside `build.sbt`, only to some
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classes in the `project` directory. Moreover, once you run `reload`, the
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debugging will not work for sure.
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- This is because sbt internally compiles everything from `build.sbt` a
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various anonymous classes and the debugger does not see their sources.
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- It is better to either use `println` directly, or to use
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`streams.value.log.info` to log messages.
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### Exclude internal sbt project from a fat jar
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- Fat jar for `fat-project` is assembled via the `fat-project / assembly` task.
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- There is `fat-project / assembly / assemblyExcludedJars` setting which is of
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type `Def.ClassPath`.
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- To exclude internal `project` one must:
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- Set `project / Compile / exportJars := true`. This ensures that
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`project / Compile / exportedProducts` is a path to the jar.
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- In `fat-project / assembly / assemblyExcludedJars` get the path to the
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`project` jar via `project / Compile / exportedProducts`.
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- Declare dependency on `project / Compile / packageBin` from
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`fat-project / assembly`.
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- Note that this is complicated because `assemblyExcludedJars` setting only
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works if it points to an already existing jar file.
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