Steps to create and release artifactbundle.

[roman-aliyev]

PR adds ability to create custom Swift Package Plugins. The idea is described here.

Example of plugin implementation:

Package.swift

// swift-tools-version: 5.8
import PackageDescription

let package = Package(
    name: "RswiftPlugin",
    platforms: [
        .macOS(.v13),
        .iOS(.v14),
    ],
    products: [
        .library(name: "RswiftPluginDependencies", targets: [ "RswiftPluginDependencies" ]),
        .plugin(name: "RswiftPlugin", targets: [ "RswiftPlugin" ])
    ],
    dependencies: [
        .package(url: "https://github.com/mac-cain13/R.swift.git", exact: "7.3.2")
    ],
    targets: [
        .target(
            name: "RswiftPluginDependencies",
            dependencies: [
                .product(name: "RswiftLibrary", package: "R.swift")
            ]
        ),
        .plugin(
            name: "RswiftPlugin",
            capability: .buildTool(),
            dependencies: [ "RswiftBinary" ]
        ),
        .binaryTarget(
            name: "RswiftBinary",
            url: "https://github.com/mac-cain13/R.swift/releases/download/7.3.2/rswift-7.3.2.artifactbundle.zip",
            checksum: "ce20486625ff25bfb6119f5eea4147483b6c882cc0ccfc697c6e7edaaf4b9eb0"
        ),
    ]
)

RswiftPlugin.swift

import PackagePlugin
import Foundation

@main
struct RswiftPlugin: BuildToolPlugin {
    func createBuildCommands(
        context: PluginContext,
        target: Target
    ) throws -> [Command] {
        fatalError("not implemented")
    }
}

#if canImport(XcodeProjectPlugin)
import XcodeProjectPlugin

extension RswiftPlugin: XcodeBuildToolPlugin {
    func createBuildCommands(
        context: XcodePluginContext,
        target: XcodeTarget
    ) throws -> [Command] {
        let sourceFiles = target.inputFiles
                        .filter { $0.type == .resource || $0.type == .unknown }
                        .map(\.path.string)
        
        return [
            .prebuildCommand(
                displayName: "Rswift",
                executable: try context.tool(named: "rswift").path,
                arguments: [
                    "generate", context.pluginWorkDirectory.appending(subpath: "R.generated.swift").string,
                    "--input-type", "input-files",
                ] + sourceFiles.flatMap { ["--input-files", $0 ] },
                outputFilesDirectory: context.pluginWorkDirectory
            )
        ]
    }
}

#endif

[abramchuk-v]

@RomanAliyev Great work, our team faced with the same issue(
@mac-cain13 @tomlokhorst Sorry guys for bothering you, but can you take a look on this PR, for my current project it'll simplify process a lot :)

[tomlokhorst]

Thanks for this PR!