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// No warrenty. Use at own risk. Modify freely. Improvements welcome. Share with others

// We are going to retrieve the the date and time this file was last saved:
var wrkFileName = "C:\\temp\\temp.txt";

// Support function used later on: remove starting and ending / as UE does not recognize these for regexp
RegExp.prototype.toUEregexp = function() { return this.toString().replace(/^\/|\/$/g, ""); }; 

// get the timestamp as a javascript Date object. getFileTimestamp is the central function.
var fileTimestamp = getFileTimestamp(wrkFileName); 

// If not null = timestamp extracted/file is found on file system:
if (fileTimestamp) {
	// Write timestamp - do your own formatting 
	// - see http://www.w3schools.com/jsref/jsref_obj_date.asp
	// - and see http://www.svendtofte.com/code/date_format/
	UltraEdit.messageBox("File "+wrkFileName+" last saved: "+fileTimestamp.toString(),"getFileTimestamp");
}
else {
	UltraEdit.messageBox("File "+wrkFileName+" not found","getFileTimestamp");
}

// ---------------------------------------------------------
function getFileTimestamp(inFileName) {
	// This function will return a timestamp (Date() object) of the input file or Null 
	// if file is not found
	
	// Save active file index
	var wrkActiveFileIndex = getActiveDocumentIndex();

	// Configure a user tool in : Advanced\Tool configuration with the folling setup:
	//
	// Menu item name = DIRtimestamp
	// Command line = DIR %sel%
	// Options tab: DOS Program, uncheck 'save active file' and 'save all files first'
	// Output tab: 'Capture output' checked.

	// Now write the filename into the active file and select:
	UltraEdit.activeDocument.top();
	UltraEdit.activeDocument.write(inFileName);
	UltraEdit.activeDocument.selectToTop();
	// Now run user tool DIRtimestamp
	UltraEdit.runTool("DIRtimestamp");
	//
	// Parse output according to local date format (important!!):
	//
	//  Indhold af C:\temp
	//
	// 19-09-2007  21:55            34.790 temp.txt

	// setup perl regexp for finding first occurence of date/time:
	// pattern is expected to be d-m-Y H:i
	var findTimestampRe = /(\d\d)-(\d\d)-(\d\d\d\d)\s+(\d\d):(\d\d)/;
	UltraEdit.perlReOn();
	UltraEdit.activeDocument.findReplace.regExp=true;
	UltraEdit.activeDocument.findReplace.find(findTimestampRe.toUEregexp());

	if (! UltraEdit.activeDocument.isFound()) {
		UltraEdit.closeFile(UltraEdit.activeDocument.path,2);
		UltraEdit.activeDocument.deleteText(); /* delete inFileName */
		return; /* no return value = null */
	}

	// get selected timestamp
	var wrkTimestampText = UltraEdit.activeDocument.selection;

	// now parse timestamp with perl regexp and destructuring assign 
	var [, wDay,wMonth,wYear,wHours,wMinutes] = findTimestampRe.exec(wrkTimestampText);

	// Assign the parsed/extracted data to a date object:
	var outDate = new Date();
	outDate.setYear(wYear);
	outDate.setMonth(wMonth - 1); /* Javascript month numbers start from 0 = Jan */
	outDate.setDate(wDay);
	outDate.setHours(wHours);
	outDate.setMinutes(wMinutes);
	outDate.setSeconds(0); /* We do not get seconds from DIR command output */

	// Close output from DIR user tool
	UltraEdit.closeFile(UltraEdit.activeDocument.path,2);

	// Restore focus on previously active file:
	UltraEdit.document[wrkActiveFileIndex].setActive();

	// Remove the inFileName again which is still selected
	UltraEdit.activeDocument.deleteText();

	return outDate;
}

// ---------------------------------------------------------
/* Find the tab index of the active document */
function getActiveDocumentIndex() {
	var tabindex = -1; /* start value */

	for (i = 0; i < UltraEdit.document.length; i++)
	{
		if (UltraEdit.activeDocument.path==UltraEdit.document[i].path) {
			tabindex = i;
			break;
		}
	}
	return tabindex;
}