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如何通过NSUserUnixTask传递参数,然后通过脚本访问?

scripting shell macos bash swift

pkamb santoshIOS · 技术社区 · 6 年前

NSUserScriptTask NSUserAppleScriptTask 和 NSUserAutomatorTask

Setting NSUserAutomatorTask variables without requiring Automator Workflows to declare that variable

就这样离开了 NSUserUnixTask ,不支持设置变量。相反,它支持 [String] arguments .

let folderURL: String? = "/files/"
let fileURLs: [String] = ["/files/file1", "/files/file2"]
let selectionType: Int? = 1

let arguments: [String] = ["how", "should", "arguments", "be", "formatted", "?"]

let unixScript = try! NSUserUnixTask(url: url)
unixScript.execute(withArguments: arguments) { (error) in
    if let error = error {
        print(error)
    }
}

3个swift变量必须压缩成一个 [字符串] NSUserUnixTask任务 用作参数。

#! /bin/bash 
say "How should the script then access/parse the arguments?"
say $@ #says the arguments

基于脚本作者的易用性,Swift代码应该如何将其信息格式化为参数 [字符串] ?

可以提供什么样的样板代码来允许从脚本轻松而实用地访问参数?

1 回复 | 直到 6 年前

djromero 6 年前

有很多方法可以做到这一点,这取决于shell脚本程序员的期望。如果我是他们中的一员,我会要求你保持简单:

位置参数(开始时强制参数的固定数量)
可选的命名参数(样式的任何参数 -flag value
更多参数(数量可变的附加参数)

按照您的示例,稍加修改:

import Foundation

let shellScript = CommandLine.arguments[1]

let folderURL: String = "/files/"
let fileURLs: [String] = ["/files/file1", "/files/file2"]
let selectionType: Int? = 1

var arguments = [String]()

// script.sh <folder> [-type <type>] file1, file2, ...

arguments.append(folderURL)  // <folder> is mandatory

if let type = selectionType {    // -type <type> is optional
    arguments.append("-type")   
    arguments.append("\(type)")
}

arguments += fileURLs  // file1, ... (if it can't be empty check it here)

assert(FileManager.default.fileExists(atPath: shellScript))
let unixScript = try! NSUserUnixTask(url: URL(fileURLWithPath: shellScript))
let stdout = FileHandle.standardOutput
unixScript.standardOutput = stdout

unixScript.execute(withArguments: arguments) { error in
    if let error = error {
        print("Failed: ", error)
    }
    exit(0)
}

dispatchMain()  // I'm not swift script expert, there may be a better way

以及相应的shell脚本:

#!/bin/bash

# mandatory positional arguments

FOLDER=$1 && shift
# other mandatory arguments goes here

TYPE=7  # default type
FILES=()

while [[ $# -gt 0 ]]; do
    arg=$1
    case $arg in
        -type) 
            TYPE=$2 && shift && shift
            ;;
        # other named parameters here
        *)
            FILES+=($1) && shift
            ;;
    esac
done

echo FOLDER: '<'${FOLDER}'>'
echo TYPE: '<'${TYPE}'>'
echo FILES: '<'${FILES[@]}'>'

exit 0

例子:

ScriptRunner /path/to/script.sh

FOLDER: </files/>
TYPE: <1>
FILES: </files/file1 /files/file2>

我使用swift包管理器构建:

// swift-tools-version:4.2

import PackageDescription

let package = Package(
    name: "ScriptRunner",
    dependencies: [],
    targets: [
        .target(name: "ScriptRunner", dependencies: [])
    ]
)