Don't rely on global SCALA_VERSION in BUILD files, use select instead

Author: aszady

scala/support/BUILD

@@ -1,98 +1,36 @@
 load("//scala:scala.bzl", "scala_library")
-load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_MAJOR_VERSION")
+load("//scala:scala_cross_version_select.bzl", "select_for_scala_version")
 
 scala_library(
     name = "test_reporter",
     srcs = ["JUnitXmlReporter.scala"],
-    scalacopts = {
-        "3.3": [
-            "-deprecation:true",
-            "-encoding",
-            "UTF-8",
-            "-feature",
-            "-language:existentials",
-            "-language:higherKinds",
-            "-language:implicitConversions",
-            "-unchecked",
-            "-Xfatal-warnings",
-        ],
-        "3.2": [
-            "-deprecation:true",
-            "-encoding",
-            "UTF-8",
-            "-feature",
-            "-language:existentials",
-            "-language:higherKinds",
-            "-language:implicitConversions",
-            "-unchecked",
-            "-Xfatal-warnings",
-        ],
-        "3.1": [
-            "-deprecation:true",
-            "-encoding",
-            "UTF-8",
-            "-feature",
-            "-language:existentials",
-            "-language:higherKinds",
-            "-language:implicitConversions",
-            "-unchecked",
-            "-Xfatal-warnings",
-        ],
-        "2.13": [
-            "-deprecation:true",
-            "-encoding",
-            "UTF-8",
-            "-feature",
-            "-language:existentials",
-            "-language:higherKinds",
-            "-language:implicitConversions",
-            "-unchecked",
-            "-Xfatal-warnings",
+    scalacopts = [
+        "-deprecation:true",
+        "-encoding",
+        "UTF-8",
+        "-feature",
+        "-language:existentials",
+        "-language:higherKinds",
+        "-language:implicitConversions",
+        "-unchecked",
+        "-Xfatal-warnings",
+    ] + select_for_scala_version(
+        any_2 = [
             "-Xlint",
             "-Ywarn-dead-code",
             "-Ywarn-numeric-widen",
             "-Ywarn-value-discard",
-            "-Wunused:imports",
         ],
-        "2.12": [
-            "-deprecation:true",
-            "-encoding",
-            "UTF-8",
-            "-feature",
-            "-language:existentials",
-            "-language:higherKinds",
-            "-language:implicitConversions",
-            "-unchecked",
-            "-Xfatal-warnings",
-            "-Xlint",
-            "-Yno-adapted-args",
-            "-Ywarn-dead-code",
-            "-Ywarn-numeric-widen",
-            "-Ywarn-value-discard",
-            "-Xfuture",
-            "-Ywarn-unused-import",
-            "-Ypartial-unification",
+        any_2_13 = [
+            "-Wunused:imports",
         ],
-        "2.11": [
-            "-deprecation:true",
-            "-encoding",
-            "UTF-8",
-            "-feature",
-            "-language:existentials",
-            "-language:higherKinds",
-            "-language:implicitConversions",
-            "-unchecked",
-            "-Xfatal-warnings",
-            "-Xlint",
+        before_2_13 = [
             "-Yno-adapted-args",
-            "-Ywarn-dead-code",
-            "-Ywarn-numeric-widen",
-            "-Ywarn-value-discard",
             "-Xfuture",
             "-Ywarn-unused-import",
             "-Ypartial-unification",
         ],
-    }[SCALA_MAJOR_VERSION],
+    ),
     visibility = ["//visibility:public"],
     deps = [
         "//scala/private/toolchain_deps:scala_xml",

src/java/io/bazel/rulesscala/scalac/BUILD

@@ -1,9 +1,5 @@
-load("@rules_java//java:defs.bzl", "java_binary")
-load(
-    "@io_bazel_rules_scala_config//:config.bzl",
-    "ENABLE_COMPILER_DEPENDENCY_TRACKING",
-    "SCALA_MAJOR_VERSION",
-)
+load("@io_bazel_rules_scala_config//:config.bzl", "ENABLE_COMPILER_DEPENDENCY_TRACKING")
+load("//scala:scala_cross_version_select.bzl", "select_for_scala_version")
 
 SCALAC_DEPS = [
     "//scala/private/toolchain_deps:scala_compile_classpath",
@@ -16,8 +12,6 @@ SCALAC_DEPS = [
     "//src/java/io/bazel/rulesscala/scalac/reporter",
 ]
 
-DEP_REPORTING_DEPS = ["//third_party/dependency_analyzer/src/main/io/bazel/rulesscala/dependencyanalyzer/compiler:dep_reporting_compiler"] if ENABLE_COMPILER_DEPENDENCY_TRACKING and SCALA_MAJOR_VERSION.startswith("2") else []
-
 java_binary(
     name = "scalac",
     srcs = [
@@ -29,7 +23,11 @@ java_binary(
     ],
     main_class = "io.bazel.rulesscala.scalac.ScalacWorker",
     visibility = ["//visibility:public"],
-    deps = DEP_REPORTING_DEPS + SCALAC_DEPS,
+    deps = (select_for_scala_version(
+        any_2 = [
+            "//third_party/dependency_analyzer/src/main/io/bazel/rulesscala/dependencyanalyzer/compiler:dep_reporting_compiler",
+        ],
+    ) if ENABLE_COMPILER_DEPENDENCY_TRACKING else []) + SCALAC_DEPS,
 )
 
 java_binary(
@@ -51,11 +49,14 @@ filegroup(
     srcs = [
         "ScalacWorker.java",
         "ScalacInvokerResults.java",
-    ] + (
-        [
+    ] + select_for_scala_version(
+        any_2 = [
             "ScalacInvoker.java",
             "ReportableMainClass.java",
-        ] if SCALA_MAJOR_VERSION.startswith("2") else ["ScalacInvoker3.java"]
+        ],
+        any_3 = [
+            "ScalacInvoker3.java",
+        ],
     ),
     visibility = ["//visibility:public"],
 )

src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter/BUILD

@@ -1,13 +1,11 @@
-load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_MAJOR_VERSION", "SCALA_MINOR_VERSION")
+load("//scala:scala_cross_version_select.bzl", "select_for_scala_version")
 
 filegroup(
     name = "deps_tracking_reporter",
-    srcs = [
-        "before_2_12_13/DepsTrackingReporter.java",
-    ] if (SCALA_MAJOR_VERSION == "2.11") or ((SCALA_MAJOR_VERSION == "2.12") and int(SCALA_MINOR_VERSION) < 13) else [
-        "after_2_12_13_and_before_2_13_12/DepsTrackingReporter.java",
-    ] if ((SCALA_MAJOR_VERSION == "2.12") and int(SCALA_MINOR_VERSION) >= 13) or ((SCALA_MAJOR_VERSION == "2.13") and int(SCALA_MINOR_VERSION) < 12) else [
-        "after_2_13_12/DepsTrackingReporter.java",
-    ],
+    srcs = select_for_scala_version(
+        before_2_12_13 = ["before_2_12_13/DepsTrackingReporter.java"],
+        between_2_12_13_and_2_13_12 = ["after_2_12_13_and_before_2_13_12/DepsTrackingReporter.java"],
+        since_2_13_12 = ["after_2_13_12/DepsTrackingReporter.java"],
+    ),
     visibility = ["//visibility:public"],
 )

src/java/io/bazel/rulesscala/scalac/reporter/BUILD

@@ -1,19 +1,24 @@
 load("@rules_proto//proto:defs.bzl", "proto_library")
 load("@rules_java//java:defs.bzl", "java_library", "java_proto_library")
-load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_MAJOR_VERSION", "SCALA_MINOR_VERSION")
+load("//scala:scala_cross_version_select.bzl", "select_for_scala_version")
 
 java_library(
     name = "reporter",
-    srcs = [
-        "//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter",
-        "before_2_12_13/ProtoReporter.java",
-    ] if SCALA_MAJOR_VERSION.startswith("2.11") or (SCALA_MAJOR_VERSION.startswith("2.12") and int(SCALA_MINOR_VERSION) < 13) else [
-        "//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter",
-        "after_2_12_13_and_before_2_13_12/ProtoReporter.java",
-    ] if ((SCALA_MAJOR_VERSION.startswith("2.12") and int(SCALA_MINOR_VERSION) >= 13) or (SCALA_MAJOR_VERSION.startswith("2.13") and int(SCALA_MINOR_VERSION) < 12)) else [
-        "//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter",
-        "after_2_13_12/ProtoReporter.java",
-    ] if (SCALA_MAJOR_VERSION.startswith("2.13") and int(SCALA_MINOR_VERSION) >= 12) else ["PlaceholderForEmptyScala3Lib.java"],
+    srcs = select_for_scala_version(
+        before_2_12_13 = [
+            "//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter",
+            "before_2_12_13/ProtoReporter.java",
+        ],
+        between_2_12_13_and_2_13_12 = [
+            "//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter",
+            "after_2_12_13_and_before_2_13_12/ProtoReporter.java",
+        ],
+        between_2_13_12_and_3 = [
+            "//src/java/io/bazel/rulesscala/scalac/deps_tracking_reporter",
+            "after_2_13_12/ProtoReporter.java",
+        ],
+        default = ["PlaceholderForEmptyScala3Lib.java"],
+    ),
     visibility = ["//visibility:public"],
     deps = [
         ":scala_deps_java_proto",

third_party/dependency_analyzer/src/main/BUILD

@@ -1,3 +1,51 @@
-load(":analyzer.bzl", "analyzer")
+load("//scala:scala.bzl", "scala_library_for_plugin_bootstrapping")
+load("//scala:scala_cross_version_select.bzl", "select_for_scala_version")
 
-analyzer()
+scala_library_for_plugin_bootstrapping(
+    name = "dependency_analyzer",
+    srcs = select_for_scala_version(
+        any_2 = [
+            "io/bazel/rulesscala/dependencyanalyzer/AstUsedJarFinder.scala",
+            "io/bazel/rulesscala/dependencyanalyzer/DependencyAnalyzer.scala",
+            "io/bazel/rulesscala/dependencyanalyzer/DependencyAnalyzerSettings.scala",
+            "io/bazel/rulesscala/dependencyanalyzer/HighLevelCrawlUsedJarFinder.scala",
+            "io/bazel/rulesscala/dependencyanalyzer/OptionsParser.scala",
+        ],
+        before_2_12_13 = [
+            "io/bazel/rulesscala/dependencyanalyzer/Reporter.scala",
+        ],
+        between_2_12_13_and_3 = [
+            "io/bazel/rulesscala/dependencyanalyzer/Reporter213.scala",
+        ],
+        since_3 = [
+            "io/bazel/rulesscala/dependencyanalyzer3/DependencyAnalyzer.scala",
+        ],
+    ),
+    resources = select_for_scala_version(
+        any_2 = ["resources/scalac-plugin.xml"],
+        any_3 = ["resources/plugin.properties"],
+    ),
+    visibility = ["//visibility:public"],
+    deps = [
+        "//scala/private/toolchain_deps:scala_compile_classpath",
+    ] + select_for_scala_version(
+        any_2 = [
+            ":scala_version",
+            "//src/java/io/bazel/rulesscala/scalac/reporter",
+        ],
+    ),
+)
+
+scala_library_for_plugin_bootstrapping(
+    name = "scala_version",
+    srcs = [
+        "io/bazel/rulesscala/dependencyanalyzer/ScalaVersion.scala",
+    ],
+    # As this contains macros we shouldn't make an ijar
+    build_ijar = False,
+    resources = ["resources/scalac-plugin.xml"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//scala/private/toolchain_deps:scala_compile_classpath",
+    ],
+)

third_party/dependency_analyzer/src/main/analyzer.bzl

@@ -1,16 +1,19 @@
 load("//scala:scala.bzl", "scala_library")
-load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_MAJOR_VERSION")
+load("//scala:scala_cross_version_select.bzl", "select_for_scala_version")
 
 licenses(["notice"])  # 3-clause BSD
 
 scala_library(
     name = "test_util",
-    srcs = ([
-        "io/bazel/rulesscala/utils/JavaCompileUtil.scala",
-        "io/bazel/rulesscala/utils/TestUtil.scala",
-    ] if SCALA_MAJOR_VERSION.startswith("2") else [
-        "io/bazel/rulesscala/utils/Scala3CompilerUtils.scala",
-    ]),
+    srcs = select_for_scala_version(
+        any_2 = [
+            "io/bazel/rulesscala/utils/JavaCompileUtil.scala",
+            "io/bazel/rulesscala/utils/TestUtil.scala",
+        ],
+        any_3 = [
+            "io/bazel/rulesscala/utils/Scala3CompilerUtils.scala",
+        ],
+    ),
     visibility = ["//visibility:public"],
     deps = [
         "//scala/private/toolchain_deps:scala_compile_classpath",