Thank you. Yes, giving the full path to the executable name indeed solve the 
problem. I found it a few moments after I send this question. Sorry if the 
question sounds a bit silly. :)
Another problem from the same code above is it fails to supply data to stdin. 
It seems the input data doesn't get delivered to the pipe. So, it just stucks 
waiting forever. I had to kill the process manually. Which also raises another 
question, how to make Task doesn't wait forever? So, it has some kind of time 
out mechanism.
Thank you.
Regards,
–Mr Bee
 

    Pada Senin, 9 Januari 2017 17:09, Alex Blewitt <alb...@apple.com> menulis:
 

 When you run it with absolute paths for the 'swift' and 'python' executables, 
does it work then?
Alex

On 9 Jan 2017, at 06:20, Mr Bee via swift-users <swift-users@swift.org> wrote:
Hi,
I'm writing a simple editor on Linux for Swift language. I use Task (was 
NSTask) to run the Swift REPL. Unfortunately, Task failed to execute the Swift 
REPL for no obvious reasons. The Swift compiler and REPL are installed just 
fine and able to execute any Swift codes. However, my exact same code has no 
problem to run bash commands.
Here's the code:_____
import Foundation
extension Task {  func execute(command: String, currentDir: String = "~", 
arguments: [String] = [], input: String = "") -> String {    if !input.isEmpty 
{      let pipeIn = Pipe()      self.standardInput = pipeIn      // multiple 
inputs are separated by newline      if let input = input.data(using: 
String.Encoding.utf8) {        pipeIn.fileHandleForWriting.write(input)      }  
  }        let pipeOut = Pipe()    self.standardOutput = pipeOut        
self.arguments = arguments    self.launchPath = command    
self.currentDirectoryPath = currentDir        self.launch()    let output = 
pipeOut.fileHandleForReading.readDataToEndOfFile()    self.waitUntilExit()      
  return String(data: output, encoding: String.Encoding(rawValue: 
String.Encoding.utf8.rawValue))!  }}
print(Task().execute(command: "swift", arguments: ["test.swift"]))  // <- 
FAILED// print(Task().execute(command: "python", arguments: ["test.py"])) // <- 
FAILED// print(Task().execute(command: "/bin/ls", arguments: ["-l"]))     // <- 
OK
_____
The test code is just a simple hello world program, nothing fancy. Can anybody 
here enlighten me what did I wrong with the code? I'm using Swift v.3.0 on 
Ubuntu Linux 14.04.
Thank you.
Regards,

–Mr Bee
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