Xcode 8 扩展执行 NSTask

本文介绍了Xcode 8 扩展执行 NSTask的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我的目标是创建一个执行 clang-format 的扩展.我的代码看起来像这样:

My goal is to create an extension that executes clang-format. My code looks something like this:

- (void)performCommandWithInvocation:(XCSourceEditorCommandInvocation *)invocation completionHandler:(void (^)(NSError * _Nullable nilOrError))completionHandler
{
    NSError *error = nil;

    NSURL *executableURL = [[self class] executableURL];

    if (!executableURL)
    {
          NSString *errorDescription = [NSString stringWithFormat:@"Failed to find clang-format. Ensure it is installed at any of these locations\n%@", [[self class] clangFormatUrls]];
              completionHandler([NSError errorWithDomain:SourceEditorCommandErrorDomain
              code:1
              userInfo:@{NSLocalizedDescriptionKey: errorDescription}]);
          return;
    }

    NSMutableArray *args = [NSMutableArray array];
    [args addObject:@"-style=LLVM"];
    [args addObject:@"someFile.m"];
    NSPipe *outputPipe = [NSPipe pipe];
    NSPipe *errorPipe = [NSPipe pipe];

    NSTask *task = [[NSTask alloc] init];
    task.launchPath = executableURL.path;
    task.arguments = args;

    task.standardOutput = outputPipe;
    task.standardError = errorPipe;

    @try
    {
          [task launch];
    }
    @catch (NSException *exception)
    {
          completionHandler([NSError errorWithDomain:SourceEditorCommandErrorDomain
              code:2
              userInfo:@{NSLocalizedDescriptionKey: [NSString stringWithFormat:@"Failed to run clang-format: %@", exception.reason]}]);
          return;
    }

    [task waitUntilExit];

    NSString *output = [[NSString alloc] initWithData:[[outputPipe fileHandleForReading] readDataToEndOfFile]
          encoding:NSUTF8StringEncoding];
    NSString *errorOutput = [[NSString alloc] initWithData:[[errorPipe fileHandleForReading] readDataToEndOfFile]
          encoding:NSUTF8StringEncoding];
    [[outputPipe fileHandleForReading] closeFile];
    [[errorPipe fileHandleForReading] closeFile];

    int status = [task terminationStatus];
    if (status == 0)
    {
          NSLog(@"Success: %@", output);
    }
    else
    {
          error = [NSError errorWithDomain:SourceEditorCommandErrorDomain
              code:3
              userInfo:@{NSLocalizedDescriptionKey: errorOutput}];
    }

    completionHandler(error);
}

我需要 try-catch 块的原因是当我尝试运行此代码时抛出异常.异常原因是:

The reason I need that try-catch block is because an exception is thrown when I try to run this code. The exception reason is:

错误:无法访问启动路径

我的 clang-format 的路径是/usr/local/bin/clang-format.我发现它不喜欢我尝试访问/usr/local/bin 中的应用程序，但/bin 是可以的(例如，如果我尝试执行/bin/ls 没有问题).

The path for my clang-format is /usr/local/bin/clang-format. What I discovered is that it doesn't like me trying to access an application in /usr/local/bin, but /bin is ok (e.g. If I try to execute /bin/ls there is no problem).

我尝试的另一个解决方案是通过设置启动路径和参数来运行/bin/bash:

Another solution I tried was to run /bin/bash by setting the launch path and arguments like this:

task.launchPath = [[[NSProcessInfo processInfo] environment] objectForKey:@"SHELL"];
task.arguments = @[@"-l", @"-c", @"/usr/local/bin/clang-format -style=LLVM someFile.m"];

这成功启动了任务，但失败并显示以下错误输出:

This successfully launches the task, but it fails with the following error output:

/bin/bash:/etc/profile: 不允许操作/bin/bash:/usr/local/bin/clang-format: 不允许操作

第一条错误消息是由于尝试在 bash 中调用 -l 参数，该参数尝试以用户身份登录.

The first error message is due to trying to call the -l parameter in bash, which tries to log in as the user.

知道如何启用对其他文件夹的访问吗?是否需要启用某种沙盒环境设置?

Any idea how I can enable access to those other folders? Is there some kind of sandbox environment setting I need to enable?

扩展执行

Xcode 8 扩展执行 NSTask

问题描述

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