sbt: init plugin with ice40 tasks.

build.sbt

@@ -1,13 +1,14 @@
-ThisBuild / scalaVersion  := "2.13.12"
 ThisBuild / version       := "0.1.0-SNAPSHOT"
 ThisBuild / organization  := "ee.hrzn"
 ThisBuild / versionScheme := Some("early-semver")
+ThisBuild / homepage      := Some(url("https://github.com/hrzn-ee/chryse"))
 
 val chiselVersion = "6.3.0"
 
 lazy val root = (project in file("."))
   .settings(
-    name := "chryse",
+    name         := "chryse",
+    scalaVersion := "2.13.12",
     libraryDependencies ++= Seq(
       "org.chipsalliance" %% "chisel"     % chiselVersion,
       "org.scalatest"     %% "scalatest"  % "3.2.18" % "test",
@@ -21,3 +22,21 @@ lazy val root = (project in file("."))
       "org.chipsalliance" % "chisel-plugin" % chiselVersion cross CrossVersion.full,
     ),
   )
+
+lazy val sbtchryse = (project in file("sbt-chryse"))
+  .enablePlugins(SbtPlugin)
+  .settings(
+    name      := "sbt-chryse",
+    sbtPlugin := true,
+    pluginCrossBuild / sbtVersion := {
+      scalaBinaryVersion.value match {
+        case "2.12" => "1.9.7"
+      }
+    },
+    scalacOptions ++= Seq(
+      // What do these even do, hey
+      "-deprecation",
+      "-feature",
+      "-Xcheckinit",
+    ),
+  )

sbt-chryse/src/main/scala/ee/hrzn/chryse/SbtChryse.scala

@@ -0,0 +1,33 @@
+package ee.hrzn.chryse.sbt
+
+import sbt._
+import sbt.Keys._
+
+import scala.sys.process._
+
+object SbtChryse extends AutoPlugin {
+  override def trigger = AllRequirements
+
+  object autoImport {
+    val chryseIce40 = inputKey[Unit]("Elaborate and synthesise for ice40")
+
+    val chryseIce40Prog =
+      inputKey[Unit]("Elaborate, synthesise for ice40, and program the board")
+  }
+  import autoImport._
+
+  override lazy val projectSettings = Seq(
+    chryseIce40 := {
+      (Compile / run).evaluated
+      if (("make ice40".!) != 0) {
+        throw new IllegalStateException("ice40 failed to synthesise")
+      }
+    },
+    chryseIce40Prog := {
+      chryseIce40.evaluated
+      if (("make ice40-prog".!) != 0) {
+        throw new IllegalStateException("ice40 failed to synthesise")
+      }
+    },
+  )
+}