blob: ad373400be28d2d30f554d34366b447022c80f72 [file] [log] [blame]
// Copyright 2016 The Tulsi Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import Foundation
/// Provides methods to locate the default Bazel instance.
public struct BazelLocator {
/// NSUserDefaults key for the default Bazel path if one is not found in the opened project's
/// workspace.
public static let DefaultBazelURLKey = "defaultBazelURL"
public static var bazelURL: URL? {
if let bazelURL = UserDefaults.standard.url(forKey: BazelLocator.DefaultBazelURLKey) {
return bazelURL
}
// If no default set, check for bazel on the user's PATH.
let semaphore = DispatchSemaphore(value: 0)
var completionInfo: ProcessRunner.CompletionInfo?
let task = TulsiProcessRunner.createProcess("/bin/bash",
arguments: ["-l", "-c", "which bazel"]) {
processCompletionInfo in
defer { semaphore.signal() }
completionInfo = processCompletionInfo
}
task.launch()
_ = semaphore.wait(timeout: DispatchTime.distantFuture)
guard let info = completionInfo else {
return nil
}
guard info.terminationStatus == 0 else {
return nil
}
guard let stdout = String(data: info.stdout, encoding: String.Encoding.utf8) else {
return nil
}
let bazelURL = URL(fileURLWithPath: stdout.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines),
isDirectory: false)
guard FileManager.default.fileExists(atPath: bazelURL.path) else {
return nil
}
UserDefaults.standard.set(bazelURL, forKey: BazelLocator.DefaultBazelURLKey)
return bazelURL
}
// MARK: - Private methods
private init() {
}
}