管道到JXA的子流程stdin [英] Pipe to subprocess stdin for JXA

问题描述

我想在 JavaScript for自动化(JXA)，然后将一个字符串发送到该子进程的stdin，其中可能包括换行符，shell metas等.以前的AppleScript对此方法使用了bash的<<<运算符，字符串连接和quoted form of字符串.如果我可以信赖的JavaScript与quoted form of等效，可以得到所有极端情况，则可以使用相同的方法.为此，我正在研究正则表达式方法.

I would like to start a subprocess in JavaScript for Automation (JXA) and send a string to that subprocess's stdin which might include newlines, shell metas, etc. Previous AppleScript approaches for this used bash's <<< operator, string concatenation, and quoted form of the string. If there was a JavaScript equivalent of quoted form of that I could trust to get all of the edge cases, I could use the same approach; I'm investigating regex methods toward that end.

但是，我想既然可以从JXA访问unistd.h，为什么不尝试直接调用$.pipe，$.fork和$.execlp? $.pipe看起来它应该以2个整数组成的数组作为其参数，但我尝试过的所有方法均无效:

However, I thought since we have access to unistd.h from JXA, why not try to just call $.pipe, $.fork, and $.execlp directly? $.pipe looks like it should take an array of 2 integers as its parameter, but none of the things that I have tried worked:

ObjC.import('unistd')
$.pipe() // Error: incorrect number of arguments
$.pipe([]) // segfault
$.pipe([3,4]) // segfault
$.pipe([$(), $()]) // segfault
var a = $(), b=$()
$.pipe([a,b]) // segfault
$.pipe($([a,b])) // NSException without a terribly helpful backtrace
$.pipe($([$(3), $(4)])) // segfault
var ref = Ref('int[2]')
$.pipe(ref)
ref[0] // 4, which is close!

有什么建议吗?

推荐答案

我找到了一种可行的方法，使用可可代替stdio:

I found an approach that works, using Cocoa instead of stdio:

ObjC.import('Cocoa')
var stdin = $.NSPipe.pipe
var stdout = $.NSPipe.pipe
var task = $.NSTask.alloc.init
task.launchPath = "/bin/cat"
task.standardInput = stdin
task.standardOutput = stdout

task.launch
var dataIn = $("foo$HOME'|\"").dataUsingEncoding($.NSUTF8StringEncoding)
stdin.fileHandleForWriting.writeData(dataIn)
stdin.fileHandleForWriting.closeFile
var dataOut = stdout.fileHandleForReading.readDataToEndOfFile
var stringOut = $.NSString.alloc.initWithDataEncoding(dataOut, $.NSUTF8StringEncoding).js
console.log(stringOut)

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