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//===--- NinjaBuildDir.swift ----------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
public final class NinjaBuildDir: Sendable {
public let path: AbsolutePath
public let projectRootDir: AbsolutePath
private let _tripleSuffix: Result<String, Error>
private let repoBuildDirs = MutexBox<[Repo: RepoBuildDir]>()
private static func detectTripleSuffix(
buildDir: AbsolutePath
) -> Result<String, Error> {
Result {
for dir in try buildDir.getDirContents() {
guard buildDir.appending(dir).isDirectory,
let triple = dir.fileName.tryDropPrefix("swift-") else {
continue
}
return triple
}
let couldBeParent = buildDir.fileName.hasPrefix("swift-")
throw XcodeGenError.noSwiftBuildDir(buildDir, couldBeParent: couldBeParent)
}
}
public var tripleSuffix: String {
get throws {
try _tripleSuffix.get()
}
}
// We can infer the project root from the location of swift-xcodegen itself.
// 1 2 3 4 5 6 7
// #filePath = <root>/swift/utils/swift-xcodegen/Sources/SwiftXcodeGen/Ninja/NinjaBuildDir.swift
private static let inferredProjectRootPath = AbsolutePath(#filePath).dropLast(7)
private static func detectProjectRoot() throws -> AbsolutePath {
let inferredSwiftPath = inferredProjectRootPath.appending(Repo.swift.relativePath)
guard inferredSwiftPath.exists else {
throw XcodeGenError.couldNotInferProjectRoot(
reason: "expected swift repo at '\(inferredSwiftPath)'"
)
}
return inferredProjectRootPath
}
public init(at path: AbsolutePath, projectRootDir: AbsolutePath?) throws {
guard path.exists else {
throw XcodeGenError.pathNotFound(path)
}
self.path = path
self._tripleSuffix = Self.detectTripleSuffix(buildDir: path)
self.projectRootDir = try projectRootDir ?? Self.detectProjectRoot()
}
public func buildDir(for repo: Repo) throws -> RepoBuildDir {
try repoBuildDirs.withLock { repoBuildDirs in
if let buildDir = repoBuildDirs[repo] {
return buildDir
}
let dir = try RepoBuildDir(repo, for: self)
repoBuildDirs[repo] = dir
return dir
}
}
}
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