Fix watcher missing root directories (#48)

Sources/SwiftToolchain/Package.swift

@@ -25,7 +25,7 @@ struct Package: Codable {
   let targets: [Target]
 
   init(with swiftPath: AbsolutePath, _ terminal: TerminalController) throws {
-    terminal.write("Parsing package manifest: ", inColor: .yellow)
+    terminal.write("\nParsing package manifest: ", inColor: .yellow)
     terminal.write("\(swiftPath) package dump-package\n")
     let output = try Data(processDataOutput([swiftPath.pathString, "package", "dump-package"]))
 

Sources/SwiftToolchain/Toolchain.swift

@@ -107,7 +107,7 @@ public final class Toolchain {
     }
   }
 
-  public func inferSourcesPaths() throws -> [String] {
+  public func inferSourcesPaths() throws -> [AbsolutePath] {
     let package = try Package(with: swiftPath, terminal)
 
     let targetPaths = package.targets.compactMap { target -> String? in
@@ -122,7 +122,9 @@ public final class Toolchain {
       return path
     }
 
-    return targetPaths
+    return try targetPaths.compactMap {
+      try fileSystem.currentWorkingDirectory?.appending(RelativePath(validating: $0))
+    }
   }
 
   private func inferDestinationPath() throws -> AbsolutePath {

Sources/carton/Commands/Dev.swift

@@ -58,17 +58,13 @@ struct Dev: ParsableCommand {
       release: release
     )
 
-    let sources = try toolchain.inferSourcesPaths().map { source -> [AbsolutePath] in
-      let relativePath = try RelativePath(validating: source)
-      guard let sources = localFileSystem.currentWorkingDirectory?.appending(relativePath)
-      else { fatalError("failed to infer the sources directory") }
+    let paths = try toolchain.inferSourcesPaths()
 
-      terminal.write("\nWatching this directory for changes: ", inColor: .green)
-      terminal.logLookup("", sources)
-      terminal.write("\n")
+    terminal.write("\nWatching these directories for changes:\n", inColor: .green)
+    paths.forEach { terminal.logLookup("", $0) }
+    terminal.write("\n")
 
-      return try localFileSystem.traverseRecursively(sources)
-    }.flatMap { $0 }
+    let sources = try paths.flatMap { try localFileSystem.traverseRecursively($0) }
 
     try Server(
       builderArguments: arguments,

Sources/carton/Helpers/FileSystem.swift

@@ -18,7 +18,7 @@ import TSCBasic
 extension FileSystem {
   func traverseRecursively(_ root: AbsolutePath) throws -> [AbsolutePath] {
     precondition(isDirectory(root))
-    var result = [AbsolutePath]()
+    var result = [root]
 
     var pathsToTraverse = [root]
     while let currentDirectory = pathsToTraverse.popLast() {