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script

// Extend the selection to include full lines
var r = editor.getSelectedLineRange();
editor.setSelectedRange(r[0], r[1]);
var sel = editor.getSelectedText();

// Don't include any trailing newline
if (sel.substring(sel.length-1) =="\n") {
	editor.setSelectedRange(r[0], r[1]-1);
	sel = editor.getSelectedText();
}

// Make a list of lines
var lines = sel.split("\n");
var n = lines.length;

// Adjust the leading hashes for each line in turn
for (var i=0; i<n; i++) {
	if (lines[i].substring(0, 4) == "### ") {
		lines[i] = lines[i].substring(4);
	} else if (lines[i].substring(0, 1) == "#") {
		lines[i] = "#" + lines[i];
	} else {
		lines[i] = "# " + lines[i];
	}
}
// Rejoin the lines and replace the text in the editor
var s = lines.join("\n");
editor.setSelectedText(s);