Synced folders (#1541)

* update xcodeproj to 8.27.7

* add syncedFolder source type

* drop xcode 15 support

* Rely on fileReference instead of adding new synchronizedRootGroup (#1557)

* fix: don't include untracked children in cache

---------

Co-authored-by: Kirill Yakimovich <kirill.yakimovich@gmail.com>

Sources/XcodeGenKit/PBXProjGenerator.swift

@@ -1454,6 +1454,12 @@ public class PBXProjGenerator {
         if !target.isLegacy {
             targetObject.productType = target.type
         }
+
+        // add fileSystemSynchronizedGroups
+        let synchronizedRootGroups = sourceFiles.compactMap { $0.fileReference as? PBXFileSystemSynchronizedRootGroup }
+        if !synchronizedRootGroups.isEmpty {
+            targetObject.fileSystemSynchronizedGroups = synchronizedRootGroups
+        }
     }
     
     private func makePlatformFilter(for filter: Dependency.PlatformFilter) -> String? {

Sources/XcodeGenKit/SourceGenerator.swift

@@ -687,6 +687,32 @@ class SourceGenerator {
 
             sourceFiles += groupSourceFiles
             sourceReference = group
+        case .syncedFolder:
+
+            let relativePath = (try? path.relativePath(from: project.basePath)) ?? path
+
+            let syncedRootGroup = PBXFileSystemSynchronizedRootGroup(
+                sourceTree: .group,
+                path: relativePath.string,
+                name: targetSource.name,
+                explicitFileTypes: [:],
+                exceptions: [],
+                explicitFolders: []
+            )
+            addObject(syncedRootGroup)
+            sourceReference = syncedRootGroup
+
+            // TODO: adjust if hasCustomParent == true
+            rootGroups.insert(syncedRootGroup)
+
+            let sourceFile = generateSourceFile(
+                targetType: targetType,
+                targetSource: targetSource,
+                path: path,
+                fileReference: syncedRootGroup,
+                buildPhases: buildPhases
+            )
+            sourceFiles.append(sourceFile)
         }
 
         if hasCustomParent {
@@ -703,7 +729,17 @@ class SourceGenerator {
     ///
     /// While `TargetSource` declares `type`, its optional and in the event that the value is not defined then we must resolve a sensible default based on the path of the source.
     private func resolvedTargetSourceType(for targetSource: TargetSource, at path: Path) -> SourceType {
-        return targetSource.type ?? (path.isFile || path.extension != nil ? .file : .group)
+        if let chosenType = targetSource.type {
+            return chosenType
+        } else {
+            if path.isFile || path.extension != nil {
+                return .file
+            } else if let sourceType = project.options.defaultSourceDirectoryType {
+                return sourceType
+            } else {
+                return .group
+            }
+        }
     }
 
     private func createParentGroups(_ parentGroups: [String], for fileElement: PBXFileElement) {

Sources/XcodeGenKit/Version.swift

@@ -16,7 +16,7 @@ extension Project {
     }
 
     var objectVersion: UInt {
-        54
+        70
     }
 
     var minimizedProjectReferenceProxies: Int {

Sources/XcodeGenKit/XCProjExtensions.swift

@@ -38,6 +38,8 @@ extension PBXProj {
                 string += "\n 🌎 " + variantGroup.nameOrPath
             } else if let versionGroup = child as? XCVersionGroup {
                 string += "\n 🔢 " + versionGroup.nameOrPath
+            } else if let syncedFolder = child as? PBXFileSystemSynchronizedRootGroup {
+                string += "\n 📁 " + syncedFolder.nameOrPath
             }
         }
         return string