Hi Abhi,
It does seem like there is a possibility of some better convenience API here.
Any ideas on what form it would take? A class method on Process that returns
the output, maybe?
- Tony
> On Nov 16, 2017, at 3:34 PM, Abhi Beckert via swift-corelibs-dev
> <swift-corelibs-dev@swift.org> wrote:
>
> Swift is a great shell scripting language except for it's lack of any API to
> execute UNIX commands. Compare these two shell scripts:
>
>> #!/usr/bin/php
>> <?
>>
>> $files = `find ~/Desktop -name *.png`;
>>
>> foreach (explode("\n", $files) as $file) {
>> // do something with $file
>> }
>
> -
>
>> #!/usr/bin/swift
>>
>> import Foundation
>>
>> let process = Process()
>> process.launchPath = "/usr/bin/find"
>> process.arguments = [
>> NSString(string:"~/Desktop").expandingTildeInPath,
>> "-name",
>> "*.png"
>> ]
>>
>> let output = Pipe()
>> process.standardOutput = output
>>
>> process.launch()
>>
>> let files: String
>> if let filesUtf8 = NSString(data:
>> output.fileHandleForReading.readDataToEndOfFile(), encoding:
>> String.Encoding.utf8.rawValue) {
>> files = filesUtf8 as String
>> } else {
>> files = NSString(data: output.fileHandleForReading.readDataToEndOfFile(),
>> encoding: String.Encoding.isoLatin1.rawValue) as NSString! as String
>> }
>>
>> files.enumerateLines { file, _ in
>> // do something with file
>> }
>
> It's a contrived example, I could have used NSFileManager, but I run into
> this all the time integrating with more complex tools such as rsync.
>
> Adding my own high level wrapper around the Process command isn't an option
> since there is no good way to import code from another file when executing
> swift asa shell script. All your code needs to be in one file.
>
> - Abhi
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