Set up logging system for swift-doc

Author: mattt

Sources/swift-doc/main.swift

@@ -1,5 +1,17 @@
 import ArgumentParser
 import Foundation
+import Logging
+import LoggingGitHubActions
+
+LoggingSystem.bootstrap { label in
+    if ProcessInfo.processInfo.environment["GITHUB_ACTIONS"] == "true" {
+        return GitHubActionsLogHandler.standardOutput(label: label)
+    } else {
+        return StreamLogHandler.standardOutput(label: label)
+    }
+}
+
+let logger = Logger(label: "org.swiftdoc.swift-doc")
 
 let fileManager = FileManager.default
 let fileAttributes: [FileAttributeKey : Any] = [.posixPermissions: 0o744]
@@ -10,8 +22,7 @@ var standardError = FileHandle.standardError
 struct SwiftDoc: ParsableCommand {
     static var configuration = CommandConfiguration(
         abstract: "A utility for generating documentation for Swift code.",
-        subcommands: [Generate.self, Coverage.self, Diagram.self],
-        defaultSubcommand: Generate.self
+        subcommands: [Generate.self, Coverage.self, Diagram.self]
     )
 }