Markdown List (SteveNY)

script

// Toggle tasks marks on selected lines
var listMark = "-";

// grab state
var [lnStart, lnLen] = editor.getSelectedLineRange();
var lnText = editor.getTextInRange(lnStart, lnLen);
var [selStart, selLen] = editor.getSelectedRange();

// just add mark if empty line
if (lnText.length == 0 || lnText == "\n") { 
editor.setSelectedText(`${listMark} `);
editor.setSelectedRange(selStart + listMark.length + 1, 0);
}
else {
// create line array and tracking vars
var lines = lnText.split('\n');
lines = lines.map(str => str.charAt(0).toUpperCase() + str.slice(1));
var startOffset = 0;
var lengthAdjust = 0;
var flTrailing = false;
if (lines[lines.length - 1] == "") { 
	lines.pop();
	flTrailing = true;
}
var newLines = [];
const re = /^(\s*)?([-\*] )?(.*)/;
const containsRe = /^(\s?)([-\*] )/;

// determine if we are removing or adding marks
var flRemoving = true;
for (var line of lines) {
if (line.length > 0 && !line.match(containsRe)) {
	flRemoving = false;
	}
}

if (!flRemoving) {
	// add marks
	var isFirst = true;
	for (var line of lines) {
	const match = re.exec(line);
		if (match[2] || line.length == 0) {
		newLines.push(line);
	}
	else {
		var prefix = match[1];
		var suffix = match[3];
		if (!prefix) { prefix = ""; }
		if (!suffix) { suffix = ""; }
		newLines.push(`${prefix}${listMark} ${suffix}`);
		if (isFirst) {
		startOffset = listMark.length + 1;
		}
		else {
		lengthAdjust += (listMark.length + 1);
		}
	}
	isFirst = false;
	}
} else {
	// remove marks
	var isFirst = true;
	for (var line of lines) {
	if (line.trim() == "") {
		newLines.push(line);
		continue;
	}
	const match = re.exec(line);
	var prefix = match[1];
	var suffix = match[3];
	var state = match[2];
	if (!prefix) { prefix = ""; }
	if (!suffix) { suffix = ""; }
	if (suffix.startsWith(" ")) { 
		suffix = suffix.substr(1);
		if (isFirst) { startOffset -= 1; }
		else { lengthAdjust -= 1; }
	}
	newLines.push(`${prefix}${suffix}`);
	if (isFirst) {
		startOffset -= state.length;
	}      
	else {
		lengthAdjust -= state.length;
	}
	isFirst = false;
	}
}

// update text and selection
if (flTrailing) {
	newLines.push("");
}
var newText = newLines.join("\n");
editor.setTextInRange(lnStart, lnLen, newText);
editor.setSelectedRange(selStart + startOffset, selLen + lengthAdjust);
}