GitHub Actions workflow logging for Swift

LoggingGitHubActions

A logging backend for SwiftLog that translates logging messages into workflow commands for GitHub Actions.

Requirements

• Swift 5.1+

Usage

Conditionally Bootstrapping GitHubActionsLogHandler

import Logging
import LoggingGitHubActions
import struct Foundation.ProcessInfo

LoggingSystem.bootstrap { label in
    if ProcessInfo.processInfo.environment["GITHUB_ACTIONS"] == "true" {
        return GitHubActionsLogHandler.standardOutput(label: label)
    } else {
        return StreamLogHandler.standardOutput(label: label)
    }
}

Using a Logger

Create an instance of Logger and log messages accordingly.
When your program is run as a step in a GitHub Actions workflow,
warning and error messages will be formatted in such a way that
it'll be surfaced in the GitHub Actions UI.

import Logging

let logger = Logger(label: "com.example.MyApp")
logger.error("Something went wrong")
// Prints "::error file=Sources/main.swift,line=5::Something went wrong

Installation

LoggingGitHubActions requires Xcode 11
or a Swift 5.1 toolchain with the Swift Package Manager.

Swift Package Manager

Add swift-log-github-actions as a dependency to your Package.swift file.

.package(url: "https://github.com/NSHipster/swift-log-github-actions.git", from: "0.0.1")

Add "LoggingGitHubActions to your target's dependencies.

.target(name: "Example",
        dependencies: ["LoggingGitHubActions"])

GitHub