Elegant Scala builds and bootstrapping Dotty with CBT
summary
CBT is a small Scala-first build tool (core ~3,600 LOC, ~25 plugins) that runs sub-100ms by keeping a background process with classloader caching and per-task caches, uses a tiny C launcher, and ships a ~150-line Maven-style resolver while planning Coursier support. Builds are plain Scala classes and zero-argument defs that compose and override to express DAGs; command-line dynamic overrides and git-repo sources let you patch or pull code. CBT successfully bootstraps Dotty by compiling with ScalaC then recompiling with the freshly built Dotty compiler. fast daemon startup composable Scala classes
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chapters (11)
- 0:00Start
- 0:39a general purpose build tool optimized for Scala
- 1:21a way to compose applications
- 12:17small, simple code base
- 13:44Let's zoom out for a second
- 17:08defining and invoking tasks compile, test, run, package,...
- 20:00build configurations are graphs directed acyclic graphs, DAGS
- 20:38irregular graphs are hard
- 33:41Use composition where we can.
- 34:53Extra: Some fun features
- 35:24dynamic overrides configure things from bash
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