Testing libSwiftPM

main.swift

import Basic
import PackageGraph
import PackageLoading
import Workspace

class MyWorkspaceDelegate: WorkspaceDelegate {
    func packageGraphWillLoad(currentGraph: PackageGraph, dependencies: AnySequence<ManagedDependency>, missingURLs: Set<String>) {
	print("packageGraphWillLoad")
    }

    func fetching(repository: String) {
    	print("fetching \(repository)")
    }

    func cloning(repository: String) {
    	 print("cloning \(repository)")
    }

    func checkingOut(repository: String, at reference: String) {
    	print("checking out \(repository)")
    }

    func removing(repository: String) {
    	print("removing \(repository)")
    }

    func warning(message: String) {
    	print("warning \(message)")
    }

    func managedDependenciesDidUpdate(_ dependencies: AnySequence<ManagedDependency>) {
	print("managedDependenciesDidUpdate")
    }
}

struct MyManifestResourceProvider: ManifestResourceProvider {
    var swiftCompiler = AbsolutePath("/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift")
    var libDir = AbsolutePath("/Users/tonisuter/Projects/swift-package-manager/.build/lib/swift/pm")
}

func printManifest(pkgPath: AbsolutePath) {
	let manifestLoader = ManifestLoader(resources: MyManifestResourceProvider())
	let workspace = Workspace(
	    dataPath: pkgPath.appending(component: ".build"),
	    editablesPath: pkgPath.appending(component: "Packages"),
	    pinsFile: pkgPath.appending(component: "Package.pins"),
	    manifestLoader: manifestLoader,
	    delegate: MyWorkspaceDelegate()
	)

	let diagnosticsEngine = DiagnosticsEngine()
	let manifests = workspace.loadRootManifests(packages: [pkgPath], diagnostics: diagnosticsEngine)

	if let manifest = manifests.first {
		print(manifest)
	} else {
		for diagnostic in diagnosticsEngine.diagnostics {
			print(diagnostic.localizedDescription)
		}
	}	
}

printManifest(pkgPath: AbsolutePath("/Users/tonisuter/Downloads/MyProj"))

My file structure looks like this and additionally, there's a regular, empty SwiftPM project at the path /Users/tonisuter/Downloads/MyProj:

.
├── include
│   ├── Basic.swiftmodule
│   ├── Build.swiftmodule
│   ├── POSIX.swiftmodule
│   ├── PackageDescription.swiftmodule
│   ├── PackageDescription4.swiftmodule
│   ├── PackageGraph.swiftmodule
│   ├── PackageLoading.swiftmodule
│   ├── PackageModel.swiftmodule
│   ├── SourceControl.swiftmodule
│   ├── Utility.swiftmodule
│   ├── Workspace.swiftmodule
│   ├── Xcodeproj.swiftmodule
│   ├── clibc.h
│   ├── libc.swiftmodule
│   └── module.modulemap
├── lib
│   └── libSwiftPM.dylib
└── main.swift

And I am using the following command to compile and run main.swift:

xcrun swift -I ./include -L ./lib -lSwiftPM -module-link-name SwiftPM main.swift

However, when I run the command I get the following error:

manifest parse error(s):
/Users/tonisuter/Downloads/MyProj/Package.swift:3:8: error: no such module 'PackageDescription'
import PackageDescription
       ^

The problem was that I used the libSwiftPM library from the master branch, but the libDir path was set to /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/pm (i.e., the folder that contains the libPackageDescription.dylib of the current version of Xcode). Instead, I had to execute the following command in the Swift Package Manager repository:

<Path-To-SwiftPM-Repository>/Utilities/bootstrap --libswiftpm-library-dir "/tmp/libSwiftPM/install/dir/include" --libswiftpm-modules-dir "/tmp/libSwiftPM/install/dir/lib"

Finally, the libDir path needs to be set to <Path-To-SwiftPM-Repository>/.build/lib/swift/pm.