Use static year range in copyright of generated FIR and tests

Dynamically calculating a year is problematic, especially in cases like
FIR where generation happens in every build. When you are working on a
last year's commit, each build creates a bunch of uncommited
 changes of updating the year in copyrights.

compiler/fir/checkers/build.gradle.kts

@@ -47,6 +47,7 @@ val generateCheckersComponents by tasks.registering(NoDebugJavaExec::class) {
     outputs.dirs(generationRoot)
 
     args(generationRoot)
+    workingDir = rootDir
     classpath = generatorClasspath
     main = "org.jetbrains.kotlin.fir.checkers.generator.MainKt"
     systemProperties["line.separator"] = "\n"

compiler/fir/tree/build.gradle.kts

@@ -40,6 +40,7 @@ val generateTree by tasks.registering(NoDebugJavaExec::class) {
     outputs.dirs(generationRoot)
 
     args(generationRoot)
+    workingDir = rootDir
     classpath = generatorClasspath
     main = "org.jetbrains.kotlin.fir.tree.generator.MainKt"
     systemProperties["line.separator"] = "\n"

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/main.kt

@@ -6,16 +6,9 @@
 package org.jetbrains.kotlin.fir.tree.generator.printer
 
 import org.jetbrains.kotlin.fir.tree.generator.context.AbstractFirTreeBuilder
-
 import java.io.File
-import java.util.*
 
-private val COPYRIGHT = """
-/*
- * Copyright 2010-${GregorianCalendar()[Calendar.YEAR]} JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
- */
-""".trimIndent()
+private val COPYRIGHT = File("license/COPYRIGHT_HEADER.txt").readText()
 
 const val VISITOR_PACKAGE = "org.jetbrains.kotlin.fir.visitors"
 const val BASE_PACKAGE = "org.jetbrains.kotlin.fir"

compiler/tests-common-new/tests/org/jetbrains/kotlin/test/generators/NewTestGeneratorImpl.kt

@@ -115,14 +115,9 @@ object NewTestGeneratorImpl : TestGenerator(METHOD_GENERATORS) {
             val out = StringBuilder()
             val p = Printer(out)
 
-            val year = GregorianCalendar()[Calendar.YEAR]
-            p.println(
-                """/*
-                | * Copyright 2010-$year JetBrains s.r.o. and Kotlin Programming Language contributors.
-                | * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
-                | */
-                |""".trimMargin()
-            )
+            val copyright = File("license/COPYRIGHT_HEADER.txt").readText()
+            p.println(copyright)
+            p.println()
             p.println("package $suiteClassPackage;")
             p.println()
             p.println("import com.intellij.testFramework.TestDataPath;")

compiler/tests-common/tests/org/jetbrains/kotlin/generators/impl/TestGeneratorImpl.kt

@@ -111,14 +111,9 @@ private class TestGeneratorImplInstance(
         val out = StringBuilder()
         val p = Printer(out)
 
-        val year = GregorianCalendar()[Calendar.YEAR]
-        p.println(
-            """/*
-                | * Copyright 2010-$year JetBrains s.r.o. and Kotlin Programming Language contributors.
-                | * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
-                | */
-                |""".trimMargin()
-        )
+        val copyright = File("license/COPYRIGHT_HEADER.txt").readText()
+        p.println(copyright)
+        p.println()
         p.println("package ", suiteClassPackage, ";")
         p.println()
         p.println("import com.intellij.testFramework.TestDataPath;")

license/COPYRIGHT_HEADER.txt

+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
\ No newline at end of file