From 95029de1637c5f8e03dc909a6689ac97f823a787 Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@linux.ibm.com>
Date: Tue, 18 Feb 2020 12:04:26 +1100
Subject: [PATCH] Use mill by default

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
---
 .travis.yml  |  2 +-
 Makefile     |  4 ++--
 README.md    | 10 ----------
 build.sc     |  2 +-
 scripts/mill | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 52 insertions(+), 14 deletions(-)
 create mode 100755 scripts/mill

diff --git a/.travis.yml b/.travis.yml
index f681303..b78fa8f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,4 +6,4 @@ services: docker
 before_install: docker pull verilator/verilator:latest
 
 script:
-        docker run --rm -t -v `pwd`:/build -w /build --entrypoint /bin/bash verilator/verilator:latest -c "apt update && apt install -y default-jre-headless gnupg python3-pexpect && apt update && echo 'deb https://dl.bintray.com/sbt/debian /' | tee -a /etc/apt/sources.list.d/sbt.list && apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2EE0EA64E40A89B84B2DF73499E82A75642AC823 && apt update && apt install -y sbt && make && make check && ./scripts/test_micropython_long.py"
+        docker run --rm -t -v `pwd`:/build -w /build --entrypoint /bin/bash verilator/verilator:latest -c "apt update && apt install -y default-jre-headless python3-pexpect curl && make && make check && ./scripts/test_micropython_long.py"
diff --git a/Makefile b/Makefile
index d56c8a4..46b522b 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ verilog_files = Core.v MemoryBlackBox.v
 verilator_binary = chiselwatt
 
 $(verilog_files): $(scala_files)
-	sbt 'runMain CoreObj'
+	scripts/mill chiselwatt.run
 
 $(verilator_binary): $(verilog_files) chiselwatt.cpp uart.c
 	# Warnings disabled until we fix the Chisel issues
@@ -24,7 +24,7 @@ clean:
 	@rm -f LoadStoreInsns.hex MemoryBlackBoxInsns.hex
 
 scala_tests: $(verilator_binary)
-	sbt testOnly
+	scripts/mill chiselwatt.test
 
 tests = $(sort $(patsubst tests/%.out,%,$(wildcard tests/*.out)))
 
diff --git a/README.md b/README.md
index 3855992..755ca1c 100644
--- a/README.md
+++ b/README.md
@@ -4,16 +4,6 @@ A tiny POWER Open ISA soft processor written in Chisel.
 
 ## Simulation using verilator
 
-* Chisel uses `sbt` (the scala build tool), but unfortunately most of the
-distros package an ancient version. On Fedora you can install an upstream
-version using:
-
-```sh
-$ sudo dnf remove sbt
-$ sudo curl https://bintray.com/sbt/rpm/rpm | sudo tee /etc/yum.repos.d/bintray-sbt-rpm.repo
-$ sudo dnf --enablerepo=bintray--sbt-rpm install sbt
-```
-
 * Chiselwatt uses `verilator` for simulation. Either install this from your
 distro or build it. On Fedora you can install the distro version using:
 
diff --git a/build.sc b/build.sc
index f6460a5..8ddcff5 100644
--- a/build.sc
+++ b/build.sc
@@ -47,5 +47,5 @@ trait HasMacroParadise extends ScalaModule {
 object chiselwatt extends CrossSbtModule with HasChisel3 with HasChiselTests with HasXsource211 with HasMacroParadise {
   override def millSourcePath = super.millSourcePath
   def crossScalaVersion = "2.12.10"
+  def mainClass = Some("CoreObj")
 }
-
diff --git a/scripts/mill b/scripts/mill
new file mode 100755
index 0000000..b2daad8
--- /dev/null
+++ b/scripts/mill
@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+
+# This is a wrapper script, that automatically download mill from GitHub release pages
+# You can give the required mill version with MILL_VERSION env variable
+# If no version is given, it falls back to the value of DEFAULT_MILL_VERSION
+DEFAULT_MILL_VERSION=0.6.0
+
+set -e
+
+if [ -z "$MILL_VERSION" ] ; then
+  if [ -f ".mill-version" ] ; then
+    MILL_VERSION="$(head -n 1 .mill-version 2> /dev/null)"
+  elif [ -f "mill" ] && [ "$BASH_SOURCE" != "mill" ] ; then
+    MILL_VERSION=$(grep -F "DEFAULT_MILL_VERSION=" "mill" | head -n 1 | cut -d= -f2)
+  else
+    MILL_VERSION=$DEFAULT_MILL_VERSION
+  fi
+fi
+
+if [ "x${XDG_CACHE_HOME}" != "x" ] ; then
+  MILL_DOWNLOAD_PATH="${XDG_CACHE_HOME}/mill/download"
+else
+  MILL_DOWNLOAD_PATH="${HOME}/.cache/mill/download"
+fi
+MILL_EXEC_PATH="${MILL_DOWNLOAD_PATH}/${MILL_VERSION}"
+
+version_remainder="$MILL_VERSION"
+MILL_MAJOR_VERSION="${version_remainder%%.*}"; version_remainder="${version_remainder#*.}"
+MILL_MINOR_VERSION="${version_remainder%%.*}"; version_remainder="${version_remainder#*.}"
+
+if [ ! -x "$MILL_EXEC_PATH" ] ; then
+  mkdir -p $MILL_DOWNLOAD_PATH
+  if [ "$MILL_MAJOR_VERSION" -gt 0 ] || [ "$MILL_MINOR_VERSION" -ge 5 ] ; then
+    ASSEMBLY="-assembly"
+  fi
+  DOWNLOAD_FILE=$MILL_EXEC_PATH-tmp-download
+  MILL_DOWNLOAD_URL="https://github.com/lihaoyi/mill/releases/download/${MILL_VERSION%%-*}/$MILL_VERSION${ASSEMBLY}"
+  curl --fail -L -o "$DOWNLOAD_FILE" "$MILL_DOWNLOAD_URL"
+  chmod +x "$DOWNLOAD_FILE"
+  mv "$DOWNLOAD_FILE" "$MILL_EXEC_PATH"
+  unset DOWNLOAD_FILE
+  unset MILL_DOWNLOAD_URL
+fi
+
+unset MILL_DOWNLOAD_PATH
+unset MILL_VERSION
+
+exec $MILL_EXEC_PATH "$@"