[BUILDR-229] Improve Scala Source Change Detection

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 1.4
• Component/s: Compilers
• Assignee: Unassigned
• Reporter: Daniel Spiewak
• Created: 18/Dec/08 18:13
• Updated: 19/Feb/09 16:41
• Resolved: 19/Feb/09 16:41

Description

To my knowledge, Buildr currently bases its decision on which Scala files to compile based on simple file change heuristics (modified timestamp). Because Scala produces such a massive number of .class files, this can sometimes lead to longer-than-necessary compilation times. SBT (simple-build-tool) contains a rather innovative feature which actually bundles a Scala compiler plugin to optimize these recompilation heuristics. Specifically: http://code.google.com/p/simple-build-tool/source/browse/trunk/src/main/scala/sbt/Analyzer.scala

I'm not entirely clear yet on how it works, but it seems like it would do much to improve Buildr's rather-lengthy Scala build times.