A swift-sh script that adds a Shell Script Build Phase to a centrist xcodeproj file.

AddBuildPhase.swift

#!/usr/bin/swift sh
import Foundation
import XcodeProj  // @tuist
import PathKit

/// INSTRUCTIONS 
/// install swift-sh on your mac, more info here 👉 https://github.com/mxcl/swift-sh
/// make this file executable $ chmod u+x AddBuildPhase.swift
/// then just run the file  $ ./AddBuildPhase.swift

let path = Path("absolute-path-to-the-xcodeproj-file") // project path
let xcodeproj = try! XcodeProj(path: path)
let pbxproj = xcodeproj.pbxproj
let project = pbxproj.projects.first!

// Create a build phase
let buildPhase = PBXShellScriptBuildPhase()
buildPhase.shellScript = """
if which swiftlint >/dev/null; then
    swiftlint
else
    echo "warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint"
fi
"""

// Add the build phase to the project
if let traget = project.targets.first(where: { $0.name == "App" }) {
    traget.buildPhases.append(buildPhase)
    pbxproj.add(object: buildPhase)
}

try! xcodeproj.write(path: path)