Sample of SourceEditorCommand.swift

SourceEditorCommandSample.swift

import Foundation
import XcodeKit

class SourceEditorCommand: NSObject, XCSourceEditorCommand {
    
    func perform(with invocation: XCSourceEditorCommandInvocation, completionHandler: @escaping (Error?) -> Void ) -> Void {
        // Implement your command here, invoking the completion handler when done. Pass it nil on success, and an NSError on failure.
        print("command identifier: \(invocation.commandIdentifier)")
        print("content UTI: \(invocation.buffer.contentUTI)")
        print("tab width: \(invocation.buffer.tabWidth)")
        print("indentation width: \(invocation.buffer.indentationWidth)")
        print("is use tab for indentation: \(invocation.buffer.usesTabsForIndentation)")
        print("lines (strings in each line): \(invocation.buffer.lines)")
        print("selections (array of XCSourceTextRange): \(invocation.buffer.selections)")
        print("completeBuffer: \(invocation.buffer.completeBuffer)")
        let error = NSError(domain: "the Domain", code: 60, userInfo: nil)
        completionHandler(error)
    }
}