AkelPad

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/// insertPathToFile
// http://akelpad.sourceforge.net/forum/viewtopic.php?p=11477#p11477
// Version: 2.0
// Modified: VladSh
// Created:  (c) se7h, v0.1.1
//
// Insert relative/absolute path to selected file
//
// Usage in Toolbar/ContextMenu plugin:
// -"Insert relative path..." Call("Scripts::Main", 1, "insertPathToFile.js", `"%d"`)
// -"Insert absolute path..." Call("Scripts::Main", 1, "insertPathToFile.js")
//
// CommonFunctions.js you found here http://akelpad.sourceforge.net/forum/viewtopic.php?p=1582#p1582

if (!AkelPad.Include("CommonFunctions.js")) WScript.Quit();

if(AkelPad.GetMainWnd()) {
	var pInitialFile = AkelPad.GetEditFile(0);
	var pSelFilePath = fileDialogDefault(true, "", pInitialFile, "*");
	if(pSelFilePath) {
		var dirPath = (WScript.Arguments.length) ? WScript.Arguments(0) : "";
		if(!dirPath) {
			AkelPad.ReplaceSel(pSelFilePath);
		} else {
			AkelPad.ReplaceSel(getRelativePath(dirPath, pSelFilePath));
		}
	}
}

function getRelativePath(mainDirPath, absoluteFilePath) {
	var dirSysSeparator = "\";
	var firstPathParts = new Array();
	var secondPathParts = new Array();
	firstPathParts = mainDirPath.split(dirSysSeparator);
	secondPathParts = absoluteFilePath.split(dirSysSeparator);
	var sameCounter = 0;

	for (var i = 0; i < Math.min(firstPathParts.length, secondPathParts.length); i++) {
		if (!(firstPathParts[i].toLowerCase() == secondPathParts[i].toLowerCase()))
			break;
		sameCounter++;
	}

	if (sameCounter == 0)
		return absoluteFilePath;

	var newPath = "";

	for (var i = sameCounter; i < firstPathParts.length; i++) {
		if (i > sameCounter)
			newPath += dirSysSeparator;
		newPath += "..";
	}

	if (newPath.length == 0)
		newPath = ".";

	for (var i = sameCounter; i < secondPathParts.length; i++) {
		newPath += dirSysSeparator;
		newPath += secondPathParts[i];
	}

	return newPath;
}