Build using Toothpick scripts (#122)

Co-authored-by: BillyGalbreath <blake.galbreath@gmail.com>

buildSrc/src/main/kotlin/task/UpstreamCommit.kt

@@ -0,0 +1,33 @@
+package task
+
+import ensureSuccess
+import gitCmd
+import org.gradle.api.Project
+import org.gradle.api.Task
+import taskGroup
+import toothpick
+import upstreamDir
+
+internal fun Project.createUpstreamCommitTask(
+    receiver: Task.() -> Unit = {}
+): Task = tasks.create("upstreamCommit") {
+    receiver(this)
+    group = taskGroup
+    doLast {
+        val oldRev = ensureSuccess(gitCmd("ls-tree", "HEAD", toothpick.upstream))
+            ?.substringAfter("commit ")?.substringBefore("\t")
+        val gitChangelog =
+            ensureSuccess(gitCmd("log", "--oneline", "$oldRev...HEAD", printOut = true, dir = upstreamDir)) {
+                logger.lifecycle("No upstream changes to commit?")
+            }
+        val commitMessage = """
+                    |Updated Upstream (${toothpick.upstream})
+                    |
+                    |Upstream has released updates that appear to apply and compile correctly
+                    |
+                    |${toothpick.upstream} Changes:
+                    |$gitChangelog
+                """.trimMargin()
+        ensureSuccess(gitCmd("commit", "-m", commitMessage, printOut = true))
+    }
+}