Vapor url生成 pdf

依赖wkhtmltopdf

 func testXXX(){
    var url =  "https://wkhtmltopdf.org/usage/wkhtmltopdf.txt"
        url = "https://mp.weixin.qq.com/s/lDjpPHwIteggP2yV08i7rQ"
        url = "https://github.com/wkhtmltopdf/wkhtmltopdf/blob/master/examples/image_c_api.c"
        url = "https://mp.weixin.qq.com/s/jJ-S0raM0uc5lah3H6hWcw"
        gennerXPDF(from: url) { (stdout:Pipe) in
            
            let data = stdout.fileHandleForReading.readDataToEndOfFile().makeBytes()
            
            let fm = DataFile(workDir: "/Volumes/Documents/GitHub/wkhtmltopdf")
            try! fm.write(data, to: "/Volumes/Documents/GitHub/wkhtmltopdf/\(url.components(separatedBy: "/").last!).pdf")
XCTAssert(data.count > 0)
        }
    }
    public func gennerXPDF(from url: String, result:(Pipe)->Void)->Void{
        let wk = Process()
        let stdout = Pipe()
        wk.launchPath = "/usr/local/bin/wkhtmltopdf"
        wk.arguments = [   "--dump-outline","toc" ,url ]
        wk.arguments?.append("-") // output to stdout
        wk.standardOutput = stdout
        wk.launch()
        result(stdout)
    }

可以根据此来生生成PDF发送给用户制作一个稍后阅读的需求
如：热门文章生成PDF发送到kindle 发送到邮箱等