I am also surprised you can’t quicklook a playground file. I am so used to navigating through the finder and hitting space on source files, it was quite jarring to just see only a large playground icon.

No idea how to use it… plus it’s not been updated for Swift 2.0

#!/usr/bin/env swift
//
// main.swift
// pggrep
//
// Created by Erica Sadun on 6/17/15.
// Copyright © 2015 Erica Sadun. All rights reserved.
//

import Foundation

// mdfind ‘kMDItemDisplayName == *.playground’
func PlaygroundList() -> [String] {
let task = NSTask()
task.launchPath = “/usr/bin/mdfind”
task.arguments = [“kMDItemDisplayName == *.playground”]

let pipe = NSPipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()

let data = pipe.fileHandleForReading.readDataToEndOfFile()

guard var s = NSString(data: data, encoding: NSUTF8StringEncoding) else {return []}
s = s.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
return s.componentsSeparatedByString(“\n”)
}

func SwiftList() -> [String] {
let task = NSTask()
task.launchPath = “/usr/bin/mdfind”
task.arguments = [“kMDItemDisplayName == *.swift”]

let pipe = NSPipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()

let data = pipe.fileHandleForReading.readDataToEndOfFile()

guard var s = NSString(data: data, encoding: NSUTF8StringEncoding) else {return []}
s = s.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
return s.componentsSeparatedByString(“\n”)
}

func PerformQuery(query : String, path: String) -> NSString {
let task = NSTask()
task.launchPath = “/usr/bin/grep”
task.arguments = [“-R”, query, path]

let pipe = NSPipe()
task.standardOutput = pipe
task.launch()
task.waitUntilExit()

let data = pipe.fileHandleForReading.readDataToEndOfFile()
guard var s = NSString(data: data, encoding: NSUTF8StringEncoding) else {return “”}
s = s.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
return s
}

func grep(query: String) {

print(“Searching for \(query)”)

// Iterate through each playground
let pgPaths = PlaygroundList()
for path in pgPaths {
// Fetch results
let s = PerformQuery(query, path: path)
if s.length == 0 {continue}

// Defer printing playground info until a match is found
var isFirst = true

// Decompose the grep results into lines
let array = s.componentsSeparatedByString(“\n”)
for line in array {
// Ignore any “Binary” files
if line.hasPrefix(“Binary”) {continue}

// Split the rest into fileName:match
let splits = line.characters.split {$0 == Character(“:”)}.map{String($0)}
let range = path.startIndex..<path.endIndex
var fname: String = splits[0] // NSString(string: splits[0]).lastPathComponent
fname.removeRange(range)
if !fname.hasSuffix("swift") {continue}
if splits.count < 2 {continue}
// If this is a first match, show the playground info
if isFirst {
let playgroundName = NSString(string: NSString(string: path).lastPathComponent).stringByDeletingPathExtension
print(String(count:playgroundName.characters.count, repeatedValue:Character("-")))
print(playgroundName)
print(String(count:playgroundName.characters.count, repeatedValue:Character("-")))
let pathIncludingPlaygroundName = NSString(string:path).stringByDeletingPathExtension
print(pathIncludingPlaygroundName)
isFirst = false
}

// Print the file name and the match
let rest = splits[1]
let pathIncludingPageName = NSString(string:fname).stringByDeletingPathExtension
print(" \(pathIncludingPageName): \(rest)")
}

// Leave spaces between playground results
if !isFirst {print("")}
}
}

var args = Process.arguments.dropFirst()
if args.count == 0 {
print("Must suply query")
exit(-1)
}