[swift-users] Using Task on Linux

[Alex Blewitt]

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 at 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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