A little Swift 4.0 script to build uncurry functions for https://github.com/carlossless/Uncurry

UncurryBuilder.swift

import Foundation

var chars = "ABCDEFGHIJKLMNOPQRSTU"
let charStrings = chars.characters
    .map{ String($0) }

func buildFunc(charStrings: [String], index: Int) -> String {
    let lowerCaseChars = charStrings.map { $0.lowercased() }
    let upperCaseChars = charStrings.map { $0.uppercased() }
    
    let genericParams = upperCaseChars
        .joined(separator: ", ")
    
    let headParams = upperCaseChars[..<(upperCaseChars.count - 1)]
    let headLabels = lowerCaseChars[..<(lowerCaseChars.count - 1)]
    
    let params = headParams
        .map { "(\($0))" }
        .joined(separator: " -> ")
    
    let lastParam = genericParams.last!
    
    let resultParams = headParams
        .joined(separator: ", ")
    
    let closureSignatureParams = zip(headLabels, headParams)
        .map { "\($0.0): \($0.1)" }
        .joined(separator: ", ")
    
    let closureInvocations = headLabels
        .map { "(\($0))" }
        .joined(separator: "")
    
    return """
    public func uncurry\(index)<\(genericParams)>(_ function: @escaping \(params) -> \(lastParam)) -> (\(resultParams)) -> \(lastParam) {
        return { (\(closureSignatureParams)) -> \(lastParam) in function\(closureInvocations) }
    }
    """
}

let range = 2..<chars.characters.count
let functions = range.map { i in
    return buildFunc(charStrings: Array(charStrings[..<i]), index: i - 1)
}

print(functions.joined(separator: "\n\n"))