C4FileMonitorMac.mm

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/*
 * OpenClonk, http://www.openclonk.org
 *
 * Copyright (c) 2010-2016, The OpenClonk Team and contributors
 *
 * Distributed under the terms of the ISC license; see accompanying file
 * "COPYING" for details.
 *
 * "Clonk" is a registered trademark of Matthes Bender, used with permission.
 * See accompanying file "TRADEMARK" for details.
 *
 * To redistribute this file separately, substitute the full license texts
 * for the above references.
 */
 
#ifdef __APPLE__
 
#include "C4Include.h"
#include "platform/C4FileMonitor.h"
 
#include "game/C4Application.h"
 
#import <Foundation/Foundation.h>
 
// Implementation using FSEvents
 
C4FileMonitor::C4FileMonitor(ChangeNotify pCallback): fStarted(false), pCallback(pCallback)
{
    eventStream = NULL;
    context.version = 0;
    context.info = this;
    context.retain = NULL;
    context.release = NULL;
    context.copyDescription = NULL;
    setObjectiveCObject([NSMutableArray arrayWithCapacity:10]);
}
 
C4FileMonitor::~C4FileMonitor()
{
    if (fStarted)
        StopStream();
}
 
static void FSEvents_Callback(
    ConstFSEventStreamRef streamRef,
    void *clientCallBackInfo,
    size_t numEvents,
    void *eventPaths,
    const FSEventStreamEventFlags eventFlags[],
    const FSEventStreamEventId eventIds[])
{
    // FSEvents only tells us about directories in which some files were modified
    char** paths = (char**)eventPaths;
    C4FileMonitor* mon = (C4FileMonitor*)clientCallBackInfo;
    for (unsigned int i = 0; i < numEvents; i++)
    {
        NSString* dir = [NSString stringWithUTF8String:paths[i]];
        NSArray* filesInDir = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:dir error:NULL];
        for (NSString* str in filesInDir)
        {
            NSString* fullPath = [dir stringByAppendingPathComponent:str];
            NSDictionary* attribs = [[NSFileManager defaultManager] attributesOfItemAtPath:fullPath error:NULL];
            NSDate* modified = [attribs fileModificationDate];
            if (modified && -[modified timeIntervalSinceNow] <= 3.0)
                mon->OnThreadEvent(Ev_FileChange, (void*)[fullPath UTF8String]);
        }
    }
}
 
void C4FileMonitor::StartStream()
{
    eventStream = FSEventStreamCreate(kCFAllocatorDefault, &FSEvents_Callback, &context, (__bridge CFArrayRef)objectiveCObject<NSMutableArray>(), kFSEventStreamEventIdSinceNow, 0.3,
        kFSEventStreamCreateFlagNone);
    FSEventStreamScheduleWithRunLoop(eventStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode);
    FSEventStreamStart(eventStream);
}
 
void C4FileMonitor::StopStream()
{
    if (fStarted)
    {
        fStarted = false;
        FSEventStreamStop(eventStream);
        FSEventStreamInvalidate(eventStream);
        FSEventStreamRelease(eventStream);
    }
}
 
void C4FileMonitor::StartMonitoring()
{
    StartStream();
    fStarted = true;
}
 
void C4FileMonitor::AddDirectory(const char *szDir)
{
    NSString* path = [NSString stringWithUTF8String:szDir];
    NSString* fullPath = [path characterAtIndex:0] == '/'
        ? path
        : [NSString stringWithFormat:@"%@/%@", [[NSFileManager defaultManager] currentDirectoryPath], path];
    [objectiveCObject<NSMutableArray>() addObject:fullPath];
}
 
void C4FileMonitor::OnThreadEvent(C4InteractiveEventType eEvent, void* pEventData)
{
    if (eEvent != Ev_FileChange) return;
    pCallback((const char *)pEventData, 0);
}
 
void C4FileMonitor::GetFDs(std::vector<struct pollfd> & FDs) { }
 
bool C4FileMonitor::Execute(int iTimeout, pollfd *) { return true; }
 
#endif