Normalize ANTLR generated code - continued (#6808)

* Normalize ANTLR generated code

* Re-add license headers

Author: greg-at-moderne

build.gradle.kts

@@ -1,3 +1,5 @@
+import java.util.Calendar
+
 plugins {
     id("org.openrewrite.build.root") version "latest.release"
     id("org.openrewrite.build.java-base") version "latest.release"
@@ -30,8 +32,14 @@ subprojects {
                 val idx = args?.indexOf("-o") ?: return@doLast
                 if (idx < 0 || idx + 1 >= args!!.size) return@doLast
                 val rootPrefix = rootProject.projectDir.absolutePath + "/"
+                val year = Calendar.getInstance().get(Calendar.YEAR)
+                val licenseHeader = "/*\n" + rootProject.file("gradle/licenseHeader.txt")
+                    .readText().trim()
+                    .replace("\${year}", year.toString())
+                    .lines()
+                    .joinToString("\n") { " * $it".trimEnd() } + "\n */\n"
                 project.file(args!![idx + 1]).walk().filter { it.extension == "java" }.forEach { file ->
-                    file.writeText(file.readLines().joinToString("\n") { line ->
+                    file.writeText(licenseHeader + file.readLines().joinToString("\n") { line ->
                         line.trimEnd().replace("// Generated from $rootPrefix", "// Generated from ")
                     } + "\n")
                 }