NSThread.swift

extension NSThread {
    class func logCallStack(showRedacted showRedacted: Bool = false) {
        #if DEBUG
            let removeRedacted: String -> Bool = { symbol in
                return showRedacted ? true : symbol.rangeOfString("<redacted>", options: []) == nil
            }
            
            
            let swiftSymbolRegex = try! NSRegularExpression(pattern: " (_T\\S+) \\+", options: [])

            let demangle: String -> String = { symbol in
                let symbolStr = symbol as NSString
                
                guard let match = swiftSymbolRegex.firstMatchInString(symbol, options: [], range: NSMakeRange(0, symbolStr.length))
                else { return symbol }
                
                let range = match.rangeAtIndex(1)
                let demangledName = _stdlib_demangleName(symbolStr.substringWithRange(range))
                
                return symbolStr.stringByReplacingCharactersInRange(range, withString: demangledName)
            }
            
            
            let symbols = self.callStackSymbols()
                              .dropFirst(2)         // drop first two symbols (logCallStack and @objc logCallStack)
                              .filter(removeRedacted)
                              .map(demangle)
                              .joinWithSeparator("\n")
            
            print(symbols)
        #endif
    }
}