improvement: Check if compiled unit is available before using

mtags/src/main/scala-3/scala/meta/internal/mtags/MtagsEnrichments.scala

@@ -53,12 +53,15 @@ object MtagsEnrichments extends ScalametaCommonEnrichments:
       new SourcePosition(source, span)
     end sourcePosition
 
-    def localContext(params: OffsetParams): Context =
-      if driver.currentCtx.run.units.isEmpty then
+    def latestRun = 
+      if driver.currentCtx.run.units.nonEmpty then
+        driver.currentCtx.run.units.head
+      else
         throw new RuntimeException(
-          "No source files were passed to the Scala 3 presentation compiler"
+          "No source files were compiled. Might be an error in the compiler itself."
         )
-      val unit = driver.currentCtx.run.units.head
+    def localContext(params: OffsetParams): Context =
+      val unit = driver.latestRun
       val pos = driver.sourcePosition(params)
       val newctx = driver.currentCtx.fresh.setCompilationUnit(unit)
       val tpdPath =

mtags/src/main/scala-3/scala/meta/internal/pc/AutoImportsProvider.scala

@@ -34,7 +34,7 @@ final class AutoImportsProvider(
       uri,
       SourceFile.virtual(filePath.toString, params.text),
     )
-    val unit = driver.currentCtx.run.units.head
+    val unit = driver.latestRun
     val tree = unit.tpdTree
 
     val pos = driver.sourcePosition(params)

mtags/src/main/scala-3/scala/meta/internal/pc/ConvertToNamedArgumentsProvider.scala

@@ -27,7 +27,7 @@ final class ConvertToNamedArgumentsProvider(
       uri,
       SourceFile.virtual(filePath.toString, params.text),
     )
-    val unit = driver.currentCtx.run.units.head
+    val unit = driver.latestRun
     val newctx = driver.currentCtx.fresh.setCompilationUnit(unit)
     val pos = driver.sourcePosition(params)
     val trees = driver.openedTrees(uri)

mtags/src/main/scala-3/scala/meta/internal/pc/ExtractMethodProvider.scala

@@ -42,7 +42,7 @@ final class ExtractMethodProvider(
     val filePath = Paths.get(uri)
     val source = SourceFile.virtual(filePath.toString, text)
     driver.run(uri, source)
-    val unit = driver.currentCtx.run.units.head
+    val unit = driver.latestRun
     val pos = driver.sourcePosition(range).startPos
     val path =
       Interactive.pathTo(driver.openedTrees(uri), pos)(using driver.currentCtx)

mtags/src/main/scala-3/scala/meta/internal/pc/InferredTypeProvider.scala

@@ -69,7 +69,7 @@ final class InferredTypeProvider(
     val source =
       SourceFile.virtual(filePath.toString, sourceText)
     driver.run(uri, source)
-    val unit = driver.currentCtx.run.units.head
+    val unit = driver.latestRun
     val pos = driver.sourcePosition(params)
     val path =
       Interactive.pathTo(driver.openedTrees(uri), pos)(using driver.currentCtx)

mtags/src/main/scala-3/scala/meta/internal/pc/PcCollector.scala

@@ -44,7 +44,7 @@ abstract class PcCollector[T](
   driver.run(uri, source)
   given ctx: Context = driver.currentCtx
 
-  val unit = driver.currentCtx.run.units.head
+  val unit = driver.latestRun
   val compilatonUnitContext = ctx.fresh.setCompilationUnit(unit)
   val offset = params match
     case op: OffsetParams => op.offset()

mtags/src/main/scala-3/scala/meta/internal/pc/PcInlayHintsProvider.scala

@@ -39,7 +39,7 @@ class PcInlayHintsProvider(
     SourceFile.virtual(filePath.toString, sourceText)
   driver.run(uri, source)
   given ctx: Context = driver.currentCtx
-  val unit = driver.currentCtx.run.units.head
+  val unit = driver.latestRun
   given InferredType.Text = InferredType.Text(text)
   val pos = driver.sourcePosition(params)
 

mtags/src/main/scala-3/scala/meta/internal/pc/SemanticdbTextDocumentProvider.scala

@@ -8,6 +8,7 @@ import java.nio.file.Paths
 import scala.util.Properties
 
 import scala.meta.internal.mtags.MD5
+import scala.meta.internal.mtags.MtagsEnrichments.*
 
 import dotty.tools.dotc.interactive.InteractiveDriver
 import dotty.tools.dotc.semanticdb.ExtractSemanticDB
@@ -32,7 +33,7 @@ class SemanticdbTextDocumentProvider(
       uri,
       SourceFile.virtual(filePath.toString, validCode),
     )
-    val tree = driver.currentCtx.run.units.head.tpdTree
+    val tree = driver.latestRun.tpdTree
     val extract = ExtractSemanticDB()
     val extractor = extract.Extractor()
     extractor.traverse(tree)(using driver.currentCtx)

mtags/src/main/scala-3/scala/meta/internal/pc/completions/OverrideCompletions.scala

@@ -177,7 +177,7 @@ object OverrideCompletions:
       uri,
       SourceFile.virtual(uri.toASCIIString, params.text),
     )
-    val unit = driver.currentCtx.run.units.head
+    val unit = driver.latestRun
     val pos = driver.sourcePosition(params)
 
     val newctx = driver.currentCtx.fresh.setCompilationUnit(unit)