revision.jse

var ForReading = 1;
var ForWriting = 2;

var fso   = new ActiveXObject("Scripting.FileSystemObject");
var shell = new ActiveXObject("WScript.Shell");

var rev;
var filename = "revision.h";
var file;
var file_ts;
var errorcode;

// First, get the file, if it doesn't exist create it.
if (!fso.FileExists(filename)) {
	fso.CreateTextFile(filename);
	file = fso.GetFile(filename);
	file_ts = file.OpenAsTextStream(ForWriting, -2);
	file_ts.WriteLine("#define REVISION   UNDEFINED");
	file_ts.Close();
	errorcode = 0;
}
else {
	file = fso.GetFile(filename);
	errorcode = 1;
}

var errormsg = !errorcode
               ? " Revision number will be set to zero. You won't be able to play online with this build."
               : " A revision file already exists and its revision number won't be updated. Make sure the revision number is correct or you won't be able to play online with this build.";

// Try to get revision number
try {
	var svnRevNum = shell.Exec("svnversion");
	rev           = svnRevNum.StdOut.ReadAll();

	// Check if SVN output is valid
	if (typeof parseInt(rev) !== "number") {
		WSH.Echo("svnversion : Unversioned directory warning SVNUD" + errorcode + ":SVN output not valid! Check if the folder is actually versioned." + errormsg);
		rev = 0;
	}
}
catch (e) {
	WSH.Echo("svnversion : SVN not found warning SVNNF" + errorcode + ":SVN could not be found!" + errormsg);
	rev = 0;
}

// Read revision.h

file_ts = file.OpenAsTextStream(ForReading, -2);
var current_line = file_ts.ReadLine() + "\r\n";
file_ts.Close();

var new_line = !rev ? "" : "#define REVISION   " + String(rev);

if (!errorcode || (!!rev && new_line !== current_line)) {
	// It has changed, update the .h

	WSH.Echo("revision.h(0) : info SVNUPD:" + (!rev ? "No revision number set!" : "SVN version updated! " + String(rev)));

	file_ts = file.OpenAsTextStream(ForWriting, -2);
	file_ts.WriteLine(new_line);
	file_ts.Close();
}