From 69293ee3a8870ee6a097f8b780a68b47fa238ec0 Mon Sep 17 00:00:00 2001
From: kasiaMarek <kasia@marek.net>
Date: Wed, 15 Jan 2025 16:38:30 +0100
Subject: [PATCH] review changes

---
 .../meta/internal/metals/Compilations.scala   | 31 ++++---------------
 .../meta/internal/metals/FileChanges.scala    |  9 ++++--
 .../internal/metals/MetalsLspService.scala    |  7 ++---
 .../metals/MutableMd5Fingerprints.scala       |  7 ++++-
 4 files changed, 21 insertions(+), 33 deletions(-)

diff --git a/metals/src/main/scala/scala/meta/internal/metals/Compilations.scala b/metals/src/main/scala/scala/meta/internal/metals/Compilations.scala
index 58e93c9123f..3559a1f9d66 100644
--- a/metals/src/main/scala/scala/meta/internal/metals/Compilations.scala
+++ b/metals/src/main/scala/scala/meta/internal/metals/Compilations.scala
@@ -23,7 +23,6 @@ import ch.epfl.scala.{bsp4j => b}
 final class Compilations(
     buildTargets: BuildTargets,
     classes: BuildTargetClasses,
-    workspace: () => AbsolutePath,
     languageClient: MetalsLanguageClient,
     refreshTestSuites: () => Unit,
     afterSuccessfulCompilation: () => Unit,
@@ -89,9 +88,11 @@ final class Compilations(
       source: AbsolutePath,
       compileInverseDependencies: Boolean,
   ): Future[Unit] =
-    expand(source).flatMap(targets =>
-      compilationFinished(targets.toSeq, compileInverseDependencies)
-    )
+    fileChanges
+      .expand(source)
+      .flatMap(targets =>
+        compilationFinished(targets.toSeq, compileInverseDependencies)
+      )
 
   def compileTarget(
       target: b.BuildTargetIdentifier
@@ -196,28 +197,8 @@ final class Compilations(
       .ignoreValue
   }
 
-  private def expand(
-      path: AbsolutePath
-  ): Future[Option[b.BuildTargetIdentifier]] = {
-    val isCompilable =
-      (path.isScalaOrJava || path.isSbt) &&
-        !path.isDependencySource(workspace()) &&
-        !path.isInTmpDirectory(workspace())
-
-    if (isCompilable) {
-      val targetOpt = buildTargets.inverseSourcesBsp(path)
-      targetOpt.foreach {
-        case tgts if tgts.isEmpty => scribe.warn(s"no build target for: $path")
-        case _ =>
-      }
-
-      targetOpt
-    } else
-      Future.successful(None)
-  }
-
   def expand(paths: Seq[AbsolutePath]): Future[Seq[b.BuildTargetIdentifier]] = {
-    val expansions = paths.map(expand)
+    val expansions = paths.map(fileChanges.expand)
     Future.sequence(expansions).map(_.flatten)
   }
 
diff --git a/metals/src/main/scala/scala/meta/internal/metals/FileChanges.scala b/metals/src/main/scala/scala/meta/internal/metals/FileChanges.scala
index e1d1d9f8c01..f6992c7865e 100644
--- a/metals/src/main/scala/scala/meta/internal/metals/FileChanges.scala
+++ b/metals/src/main/scala/scala/meta/internal/metals/FileChanges.scala
@@ -42,6 +42,11 @@ class FileChanges(buildTargets: BuildTargets, workspace: () => AbsolutePath)(
       allToCompile
     }
 
+  /**
+   * The `assumeDidNotChange` should be set when we want to assume that the file did not change
+   * if it is not present in the `previousSignatures` (opened for the first time),
+   * we set it to `true` for operations such as `didFocus` or `didOpen`.
+   */
   def buildTargetToCompile(
       path: AbsolutePath,
       fingerprint: Option[Fingerprint],
@@ -78,7 +83,7 @@ class FileChanges(buildTargets: BuildTargets, workspace: () => AbsolutePath)(
     )
   }
 
-  private def expand(
+  def expand(
       path: AbsolutePath
   ): Future[Option[BuildTargetIdentifier]] = {
     val isCompilable =
@@ -121,7 +126,7 @@ class FileChanges(buildTargets: BuildTargets, workspace: () => AbsolutePath)(
     fingerprint
       .map { fingerprint =>
         synchronized {
-          if (previousSignatures.getOrElse(path, null) == fingerprint.md5)
+          if (previousSignatures.getOrElse(path, "") == fingerprint.md5)
             false
           else {
             previousSignatures.put(path, fingerprint.md5)
diff --git a/metals/src/main/scala/scala/meta/internal/metals/MetalsLspService.scala b/metals/src/main/scala/scala/meta/internal/metals/MetalsLspService.scala
index e03978387bd..64d0601ad95 100644
--- a/metals/src/main/scala/scala/meta/internal/metals/MetalsLspService.scala
+++ b/metals/src/main/scala/scala/meta/internal/metals/MetalsLspService.scala
@@ -210,7 +210,6 @@ abstract class MetalsLspService(
   val compilations: Compilations = new Compilations(
     buildTargets,
     buildTargetClasses,
-    () => folder,
     languageClient,
     () => testProvider.refreshTestSuites.apply(()),
     () => {
@@ -923,7 +922,7 @@ abstract class MetalsLspService(
     Future
       .sequence(
         List(
-          compilations.compileFiles(List((path, null))),
+          compilations.compileFiles(List((path, Fingerprint.empty))),
           Future {
             diagnostics.didDelete(path)
             testProvider.onFileDelete(path)
@@ -1192,9 +1191,7 @@ abstract class MetalsLspService(
           thresholdMillis = 1.second.toMillis,
         ) {
           val path = params.getTextDocument.getUri.toAbsolutePath
-          codeLensProvider.findLenses(path).map(_.toList.asJava).map { found =>
-            found
-          }
+          codeLensProvider.findLenses(path).map(_.toList.asJava)
         }
       }
     }
diff --git a/metals/src/main/scala/scala/meta/internal/metals/MutableMd5Fingerprints.scala b/metals/src/main/scala/scala/meta/internal/metals/MutableMd5Fingerprints.scala
index 3bc468bcec5..b8a09b618fe 100644
--- a/metals/src/main/scala/scala/meta/internal/metals/MutableMd5Fingerprints.scala
+++ b/metals/src/main/scala/scala/meta/internal/metals/MutableMd5Fingerprints.scala
@@ -91,4 +91,9 @@ final class MutableMd5Fingerprints extends Md5Fingerprints {
   override def toString: String = s"Md5FingerprintProvider($fingerprints)"
 }
 
-case class Fingerprint(text: String, md5: String)
+case class Fingerprint(text: String, md5: String) {
+  def isEmpty: Boolean = md5.isEmpty()
+}
+object Fingerprint {
+  def empty: Fingerprint = Fingerprint("", "")
+}