Logger

It is simple logger layer written in Swift

struct Car {
    let logger = Logger(Car.self)
    
    func doSomething() {
        logger.i("did something")
    }
}

By default it is configured to use print function (LocalLogStore).

You can add another log handler by implementing protocol LogStore and registering it to LoggerDispatcher.stores.append(...)

struct MyLogger: LogStore {
    func log(_ level: LogLevel, _ tag: String, _ message: String) {
        print("Simon says: \(message)")
    }
}

LoggerDispatcher.stores.append(MyLogger())

Logging threshold

If you want to doscard all debug messages, set threshold to info:

LoggerDispatcher.logLevel = .info

Swift Package Manager

let package = Package(
    name: "SwiftApp",
    dependencies: [
        .package(url: "https://github.com/tomieq/Logger.git", .upToNextMajor(from: "1.2.0"))
    ],
    targets: [dependencies.
        .executableTarget(
            name: "SwiftApp",
            dependencies: [
                .product(name: "Logger", package: "Logger")
            ]
        ),
    ],
    // set mode 5 if run in Docker
    swiftLanguageModes: [.v5]
)

Logging in Docker

Disable buffering:

#if os(Linux)
import Glibc
#else
import Darwin
#endif

setvbuf(stdout, nil, _IONBF, 0)

And it works only when compiling in Swift5 mode:

swiftLanguageModes: [.v5]