From ea6a105cec921c914d4895b4ec0ea0ab89b3274d Mon Sep 17 00:00:00 2001
From: Brice Jaglin <bjaglin@teads.tv>
Date: Tue, 26 May 2020 21:28:17 +0200
Subject: [PATCH] naive JAR hashing
We need a nightly containing https://github.com/sbt/sbt/pull/5344
if we want children projects to be insensitive to repackaging.
---
src/main/scala/sbtmemoize/MemoizePlugin.scala | 37 +++++++++++++++++++
src/sbt-test/sbt-memoize/simple/test | 3 +-
2 files changed, 39 insertions(+), 1 deletion(-)
diff --git a/src/main/scala/sbtmemoize/MemoizePlugin.scala b/src/main/scala/sbtmemoize/MemoizePlugin.scala
index 627c844..ac26b0d 100644
--- a/src/main/scala/sbtmemoize/MemoizePlugin.scala
+++ b/src/main/scala/sbtmemoize/MemoizePlugin.scala
@@ -1,9 +1,46 @@
package sbtmemoize
+import sbt.Keys._
import sbt._
+import sjsonnew.support.murmurhash.Hasher
+import sjsonnew.{Builder, HashWriter}
object MemoizePlugin extends AutoPlugin {
override def trigger = noTrigger
+ object autoImport {
+ val memoizeCacheKey =
+ taskKey[Int]("Compute the cache key for the current state of the project")
+ }
+
+ import autoImport._
+
+ override def projectSettings: Seq[Def.Setting[_]] =
+ Seq(Compile, Test).flatMap(inConfig(_)(memoizeConfigSettings))
+
+ lazy val memoizeConfigSettings: Seq[Def.Setting[_]] =
+ Seq(
+ memoizeCacheKey := {
+ // like FileInfo.hash but without the path (which is environment-specific)
+ val hashWriter: HashWriter[Seq[File]] = new HashWriter[Seq[File]] {
+ override def write[J](obj: Seq[File], builder: Builder[J]): Unit = {
+ import sjsonnew.BasicJsonProtocol._
+ builder.beginArray()
+ obj.foreach { file =>
+ builder.beginObject()
+ builder.addField("hash", file.hash)
+ builder.endObject()
+ }
+ builder.endArray()
+ }
+ }
+
+ val srcs = sources.value
+ val deps = dependencyClasspathAsJars.value.map(_.data)
+
+ Hasher.hash(srcs ++ deps)(hashWriter).get
+ }
+ )
+
}
diff --git a/src/sbt-test/sbt-memoize/simple/test b/src/sbt-test/sbt-memoize/simple/test
index 73a6820..f949919 100644
--- a/src/sbt-test/sbt-memoize/simple/test
+++ b/src/sbt-test/sbt-memoize/simple/test
@@ -1 +1,2 @@
-> compile
\ No newline at end of file
+> compile
+> show memoizeCacheKey
\ No newline at end of file