1import Foundation
2
3/// ScriptHelper is a helper for invoking AppleScript.
4enum ScriptHelper {
5    
6    /// Execute an AppleScript via osascript with the provided arguments.
7    /// Returns the output or throws an error.
8    @discardableResult
9    static func runAppleScript(_ script: String, arguments: [String]) async throws -> String {
10        try await Task.detached(priority: .userInitiated) {
11            let task = Process()
12            task.launchPath = "/usr/bin/osascript"
13            
14            var args = ["-e", script]
15            args.append(contentsOf: arguments)
16            task.arguments = args
17            
18            let stdoutPipe = Pipe()
19            let stderrPipe = Pipe()
20            task.standardOutput = stdoutPipe
21            task.standardError = stderrPipe
22            
23            try task.run()
24            task.waitUntilExit()
25            
26            let stdout = self.readAsString(stdoutPipe)
27            let stderr = self.readAsString(stderrPipe)
28
29            print("AppleScript output: status=\(task.terminationStatus), stdout=\(stdout), stderr=\(stderr)")
30            
31            if task.terminationStatus != 0 {
32                let errorMessage = stderr.isEmpty ? "Unknown AppleScript execution error." : "AppleScript execution error: \(stderr)"
33                throw NSError(
34                    domain: "ScriptHelperDomain",
35                    code: Int(task.terminationStatus),
36                    userInfo: [NSLocalizedDescriptionKey: errorMessage]
37                )
38            }
39            
40            return stdout
41        }.value
42    }
43    
44    private static func readAsString(_ p: Pipe) -> String {
45        let data = p.fileHandleForReading.readDataToEndOfFile()
46        guard let output = String(data: data, encoding: .utf8) else {
47            return ""
48        }
49        
50        return output.trimmingCharacters(in: .whitespacesAndNewlines)
51    }
52}