WIP: Bzlmod part the ninety-second

Got all Scala 2 versions to run the `//test/scalafmt/...` tests, even
though they all fail. Scala 3 won't work to begin with because the test
files are all using Scala 2 syntax.

Updated `scalafmt_repositories.bzl` to import all the libraries needed
by Scalafmt under Scala 2.11. This made the file neater, actually, since
there more libraries were in common than previously.

Added the conditionally compiled `ScalafmtWorker-2_11.scala` file to fix
the following compiler error:

```txt
$ bazel test --repo_env=SCALA_VERSION=2.11.12 //test/scalafmt/...

ERROR: .../scala/scalafmt/BUILD:22:13:
  scala @@//scala/scalafmt:scalafmt [for tool] failed: (Exit 1):
  scalac failed: error executing Scalac command
  (from target //scala/scalafmt:scalafmt)
  bazel-bin/src/java/io/bazel/rulesscala/scalac/scalac
  @bazel-bin/scala/scalafmt/scalafmt.jar-0.params

scala/scalafmt/scalafmt/ScalafmtWorker.scala:8:
  error: object sysops is not a member of package org.scalafmt
import org.scalafmt.sysops.FileOps
                    ^
scala/scalafmt/scalafmt/ScalafmtWorker.scala:21:
  error: not found: value FileOps
    val source = FileOps.readFile(
                 ^
scala/scalafmt/scalafmt/ScalafmtWorker.scala:25:
  error: value fromHoconFile is not a member of
  object org.scalafmt.config.ScalafmtConfig
    val config = ScalafmtConfig.fromHoconFile(
                                ^
Build failure with errors.
```

Then downgraded to `com.lihaoyi:pprint_2.11:0.5.4` for Scala 2.11 to fix
this error:

```txt
$ bazel test --repo_env=SCALA_VERSION=2.11.12 //test/scalafmt/...

INFO: Analyzed 9 targets (43 packages loaded, 2484 targets configured).
ERROR: .../test/scalafmt/BUILD:63:23: ScalaFmt
  test/scalafmt/test/scalafmt/unformatted/unformatted-custom-conf.scala.fmt.output
  failed: Worker process did not return a WorkResponse:

---8<---8<--- Start of log, file at .../bazel-workers/worker-99-ScalaFmt.log ---8<---8<---
Exception in thread "main" java.lang.NoSuchMethodError:
  'pprint.TPrint pprint.TPrint$.lambda(scala.Function1)'
    at org.scalafmt.config.Docstrings$.<init>(Docstrings.scala:77)
    at org.scalafmt.config.Docstrings$.<clinit>(Docstrings.scala)
    at org.scalafmt.config.ScalafmtConfig$.apply$default$3(ScalafmtConfig.scala:104)
    at org.scalafmt.config.ScalafmtConfig$.<init>(ScalafmtConfig.scala:236)
    at org.scalafmt.config.ScalafmtConfig$.<clinit>(ScalafmtConfig.scala)
    at org.scalafmt.config.Config$.fromHoconFile$default$3(Config.scala:42)
    at io.bazel.rules_scala.scalafmt.ScalafmtWorker$.work(ScalafmtWorker-2_11.scala:25)
    at io.bazel.rulesscala.worker.Worker.persistentWorkerMain(Worker.java:96)
    at io.bazel.rulesscala.worker.Worker.workerMain(Worker.java:49)
    at io.bazel.rules_scala.scalafmt.ScalafmtWorker$.main(ScalafmtWorker-2_11.scala:14)
    at io.bazel.rules_scala.scalafmt.ScalafmtWorker.main(ScalafmtWorker-2_11.scala)
---8<---8<--- End of log ---8<---8<---
```

Now all Scala 2 versions are failing with the following:

```txt
$ bazel test --repo_env=SCALA_VERSION=2.11.12 //test/scalafmt/...

INFO: Analyzed 9 targets (80 packages loaded, 3307 targets configured).
ERROR: .../test/scalafmt/BUILD:43:20: ScalaFmt
  test/scalafmt/test/scalafmt/formatted/formatted-test.scala.fmt.output
  failed: Worker process did not return a WorkResponse:

---8<---8<--- Start of log, file at .../bazel-workers/worker-134-ScalaFmt.log ---8<---8<---
Exception in thread "main" java.lang.NoSuchMethodError:
  'boolean com.google.protobuf.GeneratedMessageV3.isStringEmpty(java.lang.Object)'
    at com.google.devtools.build.lib.worker.WorkerProtocol$WorkResponse.getSerializedSize(WorkerProtocol.java:2704)
    at com.google.protobuf.AbstractMessageLite.writeDelimitedTo(AbstractMessageLite.java:89)
    at io.bazel.rulesscala.worker.Worker.persistentWorkerMain(Worker.java:109)
    at io.bazel.rulesscala.worker.Worker.workerMain(Worker.java:49)
    at io.bazel.rules_scala.scalafmt.ScalafmtWorker$.main(ScalafmtWorker-2_11.scala:14)
    at io.bazel.rules_scala.scalafmt.ScalafmtWorker.main(ScalafmtWorker-2_11.scala)
---8<---8<--- End of log ---8<---8<---
```

This issue seems to suggest a library bump may fix it; will look into
it:

- protocolbuffers/protobuf#9236

scala/scalafmt/BUILD

@@ -1,11 +1,9 @@
+load("//scala/scalafmt/toolchain:toolchain.bzl", "export_scalafmt_deps")
+load("//scala/scalafmt:phase_scalafmt_ext.bzl", "scalafmt_singleton")
 load("//scala:scala.bzl", "scala_binary")
 load("//scala:scala_cross_version.bzl", "version_suffix")
-load("//scala/scalafmt/toolchain:toolchain.bzl", "export_scalafmt_deps")
+load("//scala:scala_cross_version_select.bzl", "select_for_scala_version")
 load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_VERSION")
-load(
-    "//scala/scalafmt:phase_scalafmt_ext.bzl",
-    "scalafmt_singleton",
-)
 
 filegroup(
     name = "runner",
@@ -21,7 +19,10 @@ filegroup(
 
 scala_binary(
     name = "scalafmt",
-    srcs = ["scalafmt/ScalafmtWorker.scala"],
+    srcs = select_for_scala_version(
+        before_2_12_0 = ["scalafmt/ScalafmtWorker-2_11.scala"],
+        since_2_12_0 = ["scalafmt/ScalafmtWorker.scala"],
+    ),
     main_class = "io.bazel.rules_scala.scalafmt.ScalafmtWorker",
     visibility = ["//visibility:public"],
     deps = [

scala/scalafmt/scalafmt/ScalafmtWorker-2_11.scala

@@ -0,0 +1,47 @@
+package io.bazel.rules_scala.scalafmt
+
+import io.bazel.rulesscala.worker.Worker
+import java.io.File
+import java.nio.file.Files
+import org.scalafmt.Scalafmt
+import org.scalafmt.config.Config
+import org.scalafmt.util.FileOps
+import scala.annotation.tailrec
+import scala.io.Codec
+
+object ScalafmtWorker extends Worker.Interface {
+
+  def main(args: Array[String]): Unit = Worker.workerMain(args, ScalafmtWorker)
+
+  def work(args: Array[String]): Unit = {
+    val argName = List("config", "input", "output")
+    val argFile = args.map{x => new File(x)}
+    val namespace = argName.zip(argFile).toMap
+
+    val source = FileOps.readFile(
+      namespace.getOrElse("input", new File(""))
+    )(Codec.UTF8)
+
+    val config = Config.fromHoconFile(
+      namespace.getOrElse("config", new File(""))
+    ).get
+
+    @tailrec
+    def format(code: String): String = {
+      val formatted = Scalafmt.format(code, config).get
+      if (code == formatted) code else format(formatted)
+    }
+
+    val output = try {
+      format(source)
+    } catch {
+      case e @ (_: org.scalafmt.Error | _: scala.meta.parsers.ParseException) => {
+        System.out.println("Unable to format file due to bug in scalafmt")
+        System.out.println(e.toString)
+        source
+      }
+    }
+
+    Files.write(namespace.getOrElse("output", new File("")).toPath, output.getBytes)
+  }
+}

scala/scalafmt/scalafmt_repositories.bzl

@@ -22,57 +22,54 @@ def scalafmt_default_config(path = ".scalafmt.conf"):
         path = "",
     )
 
-_SCALAFMT_BASE_DEPS = [
+_SCALAFMT_DEPS = [
+    "com_geirsson_metaconfig_core",
+    "com_geirsson_metaconfig_typesafe_config",
     "com_google_protobuf_protobuf_java",
+    "com_lihaoyi_fansi",
     "com_lihaoyi_fastparse",
+    "com_lihaoyi_sourcecode",
     "com_thesamet_scalapb_lenses",
     "com_thesamet_scalapb_scalapb_runtime",
+    "com_typesafe_config",
     "org_scala_lang_modules_scala_collection_compat",
     "org_scala_lang_scalap",
+    "org_scalameta_common",
+    "org_scalameta_parsers",
     "org_scalameta_scalafmt_core",
+    "org_scalameta_scalameta",
+    "org_scalameta_trees",
+    "org_typelevel_paiges_core",
 ]
 
-_SCALAFMT_CORE_DEPS_2_11 = [
-    "com_geirsson_metaconfig_core",
-    "com_geirsson_metaconfig_typesafe_config",
-    "org_scalameta_scalameta",
+_SCALAFMT_DEPS_2_11 = [
     "com_lihaoyi_pprint",
-    "com_lihaoyi_fansi",
-    "com_lihaoyi_sourcecode",
-    "org_typelevel_paiges_core",
+    "org_scalameta_fastparse",
+    "org_scalameta_fastparse_utils",
 ]
 
-_SCALAFMT_CORE_DEPS = [
-    "com_geirsson_metaconfig_core",
+_SCALAFMT_DEPS_2_12 = [
     "com_geirsson_metaconfig_pprint",
-    "com_geirsson_metaconfig_typesafe_config",
-    "com_lihaoyi_fansi",
-    "com_lihaoyi_sourcecode",
-    "com_typesafe_config",
-    "org_scalameta_common",
+    "com_lihaoyi_geny",
     "org_scalameta_mdoc_parser",
-    "org_scalameta_parsers",
     "org_scalameta_scalafmt_config",
     "org_scalameta_scalafmt_sysops",
-    "org_scalameta_scalameta",
-    "org_scalameta_trees",
-    "org_typelevel_paiges_core",
 ]
 
 def scalafmt_artifact_ids(scala_version):
     major_version = extract_major_version(scala_version)
 
     if major_version == "2.11":
-        return _SCALAFMT_BASE_DEPS + _SCALAFMT_CORE_DEPS_2_11
+        return _SCALAFMT_DEPS + _SCALAFMT_DEPS_2_11
 
-    extra_deps = ["com_lihaoyi_geny"]
+    extra_deps = []
 
     if major_version == "2.12":
         extra_deps.append("com_github_bigwheel_util_backports")
     else:
         extra_deps.append("io_bazel_rules_scala_scala_parallel_collections")
 
-    return _SCALAFMT_BASE_DEPS + _SCALAFMT_CORE_DEPS + extra_deps
+    return _SCALAFMT_DEPS + _SCALAFMT_DEPS_2_12 + extra_deps
 
 def scalafmt_repositories(
         maven_servers = _default_maven_server_urls(),

third_party/repositories/scala_2_11.bzl

@@ -197,8 +197,8 @@ artifacts = {
         ],
     },
     "com_lihaoyi_pprint": {
-        "artifact": "com.lihaoyi:pprint_2.11:0.8.1",
-        "sha256": "3755b8e5d1423931219ab607e8fd9b6db472740dd5f815f8b0715312e11d06fe",
+        "artifact": "com.lihaoyi:pprint_2.11:0.5.4",
+        "sha256": "9b31150ee7f07212a825e02fca56e0999789d2b8ec720a84b75ce29ca7e195b5",
         "deps": [
             "@com_lihaoyi_fansi",
             "@com_lihaoyi_sourcecode",