sbt-bridge: Handle missing source files

Same as #8883, but really fixes #7442.

Author: smarter

sbt-bridge/src/xsbt/DelegatingReporter.java

@@ -78,45 +78,59 @@ public void doReport(dotty.tools.dotc.reporting.Diagnostic dia, Context ctx) {
       SourcePosition pos = dia.pos();
       SourceFile src = pos.source();
       position = new Position() {
-        public Optional<java.io.File> sourceFile() {
-          if (!src.exists()) return Optional.empty();
-          else return Optional.ofNullable(src.file().file());
-        }
         public Optional<String> sourcePath() {
-          if (!src.exists()) return Optional.empty();
-          else return Optional.ofNullable(src.file().path());
+          if (!src.exists())
+            return Optional.empty();
+
+          return Optional.ofNullable(src.file().path());
+        }
+        public Optional<java.io.File> sourceFile() {
+          if (!src.exists())
+            return Optional.empty();
+
+          return Optional.ofNullable(src.file().file());
         }
         public Optional<Integer> line() {
+          if (!src.file().exists())
+            return Optional.empty();
+
           int line = pos.line() + 1;
-          if (line == -1) return Optional.empty();
-          else return Optional.of(line);
+          if (line == -1)
+            return Optional.empty();
+
+          return Optional.of(line);
         }
         public String lineContent() {
+          if (!src.file().exists())
+            return "";
+
           String line = pos.lineContent();
           if (line.endsWith("\r\n"))
             return line.substring(0, line.length() - 2);
-          else if (line.endsWith("\n") || line.endsWith("\u000c"))
+          if (line.endsWith("\n") || line.endsWith("\u000c"))
             return line.substring(0, line.length() - 1);
-          else
-            return line;
+
+          return line;
         }
         public Optional<Integer> offset() {
           return Optional.of(pos.point());
         }
         public Optional<Integer> pointer() {
-          if (!src.exists()) return Optional.empty();
-          else return Optional.of(pos.point() - src.startOfLine(pos.point()));
+          if (!src.file().exists())
+            return Optional.empty();
+
+          return Optional.of(pos.point() - src.startOfLine(pos.point()));
         }
         public Optional<String> pointerSpace() {
-          if (!src.exists()) return Optional.empty();
-          else {
-            String lineContent = this.lineContent();
-            int pointer = this.pointer().get();
-            StringBuilder result = new StringBuilder();
-            for (int i = 0; i < pointer; i++)
-              result.append(lineContent.charAt(i) == '\t' ? '\t' : ' ');
-            return Optional.of(result.toString());
-          }
+          if (!src.file().exists())
+            return Optional.empty();
+
+          String lineContent = this.lineContent();
+          int pointer = this.pointer().get();
+          StringBuilder result = new StringBuilder();
+          for (int i = 0; i < pointer; i++)
+            result.append(lineContent.charAt(i) == '\t' ? '\t' : ' ');
+          return Optional.of(result.toString());
         }
       };
     } else {

sbt-dotty/sbt-test/compilerReporter/i7442/a/A.scala

@@ -0,0 +1,5 @@
+object A {
+  inline def a[T](x: T): T = inline x match {
+    case 1 => x
+  }
+}

sbt-dotty/sbt-test/compilerReporter/i7442/b/B.scala

@@ -0,0 +1,4 @@
+object B {
+  def b = A.a(2)
+}
+

sbt-dotty/sbt-test/compilerReporter/i7442/build.sbt

@@ -0,0 +1,18 @@
+lazy val a = project.in(file("a"))
+  .settings(
+    scalaVersion := sys.props("plugin.scalaVersion")
+  )
+lazy val b = project.in(file("b"))
+  .settings(Reporter.checkSettings)
+  .settings(
+    scalaVersion := sys.props("plugin.scalaVersion"),
+    // Manually depend on `a` so that we can:
+    // 1. Compile `a`
+    // 2. Remove a source file in `a`
+    // 3. Compile `b` without forcing a recompilation of `a`
+    Compile / unmanagedJars := {
+      val s = Seq(Attributed.blank((a / Compile / packageBin / artifactPath).value))
+      println("s: " + s)
+      s
+    }
+  )

sbt-dotty/sbt-test/compilerReporter/i7442/project/DottyInjectedPlugin.scala

@@ -0,0 +1,11 @@
+import sbt._
+import Keys._
+
+object DottyInjectedPlugin extends AutoPlugin {
+  override def requires = plugins.JvmPlugin
+  override def trigger = allRequirements
+
+  override val projectSettings = Seq(
+    scalaVersion := sys.props("plugin.scalaVersion"),
+  )
+}

sbt-dotty/sbt-test/compilerReporter/i7442/project/Reporter.scala

@@ -0,0 +1,42 @@
+import sbt._
+import Keys._
+import KeyRanks.DTask
+
+object Reporter {
+  import xsbti.{Reporter, Problem, Position, Severity}
+
+  lazy val check = TaskKey[Unit]("check", "make sure compilation info are forwared to sbt")
+
+  // compilerReporter is marked private in sbt
+  lazy val compilerReporter = TaskKey[xsbti.Reporter]("compilerReporter", "Experimental hook to listen (or send) compilation failure messages.", DTask)
+
+  lazy val reporter =
+    new xsbti.Reporter {
+      private val buffer = collection.mutable.ArrayBuffer.empty[Problem]
+      def reset(): Unit = buffer.clear()
+      def hasErrors: Boolean = buffer.exists(_.severity == Severity.Error)
+      def hasWarnings: Boolean = buffer.exists(_.severity == Severity.Warn)
+      def printSummary(): Unit = println(problems.mkString(System.lineSeparator))
+      def problems: Array[Problem] = buffer.toArray
+      def log(problem: Problem): Unit = buffer.append(problem)
+      def comment(pos: xsbti.Position, msg: String): Unit = ()
+    }
+
+  lazy val checkSettings = Seq(
+    compilerReporter in (Compile, compile) := reporter,
+    check := (compile in Compile).failure.map(_ => {
+      println(reporter.problems.toList)
+      assert(reporter.problems.length == 1)
+      val problem = reporter.problems.head
+      // Check that all methods on position can ba called without crashing
+      val pos = problem.position
+      println(pos.sourceFile)
+      println(pos.sourcePath)
+      println(pos.line)
+      println(pos.lineContent)
+      println(pos.offset)
+      println(pos.pointer)
+      println(pos.pointerSpace)
+    }).value
+  )
+}

sbt-dotty/sbt-test/compilerReporter/i7442/project/plugins.sbt

@@ -0,0 +1 @@
+addSbtPlugin("ch.epfl.lamp" % "sbt-dotty" % sys.props("plugin.version"))

sbt-dotty/sbt-test/compilerReporter/i7442/test

@@ -0,0 +1,4 @@
+> a/packageBin
+# Remove the source file to check if we later try to read it because it's in the @SourceFile annotation of the tasty file being inlined
+$ delete a/A.scala
+> b/check

sbt-dotty/sbt-test/compilerReporter/simple/build.sbt

@@ -1 +1,3 @@
-Reporter.checkSettings
+scalaVersion := sys.props("plugin.scalaVersion")
+
+Reporter.checkSettings