Re: How do I create a fileWatcher with an onFileChange event using spawn?

[Nemanja Boric via Digitalmars-d-learn]

On Monday, 28 August 2017 at 06:27:20 UTC, Jacob Carlborg wrote:
On 2017-08-25 23:25, Enjoys Math wrote:


Something like this:


module file_watcher;

import std.concurrency;
import std.file;
import std.signals;
import std.datetime;


void fileWatcher(Tid tid, string filename, int loopSleep) {
     auto modified0 = timeLastModified(filename);

     while (true) {
         modified = timeLastModified(filename);

         if (modified > modified0) {
             modified0 = modified;
             //if (onFileChange !is null)
             //    onFileChange(receiver);
         }

         sleep(dur!"msecs"(loopSleep));
     }
}


But I'm not sure how to send the onFiledChange event.

A delegate perhaps?

Or you can look at any of the existing event driven libraries 
that do this:

http://code.dlang.org/packages/vibe-core
http://code.dlang.org/packages/libasync

In addition, to avoid polling, it's possible to register yourself 
to the operating system so it will tell you when a modification 
on the given file has happened: 
https://msdn.microsoft.com/en-us/library/aa364417%28VS.85%29.aspx?f=255&MSPPError=-2147217396 http://man7.org/linux/man-pages/man7/inotify.7.html