Markdown Quote

script

// Add Markdown blockquote formatting to the
// selected lines (or all lines).

// Define the text that's going to be edited.
var [oldStart, oldLen] = editor.getSelectedRange();
if (oldLen == 0) { // use full draft
	var [start, len] = [0, editor.getText().length];
}
else {
	var [start, len] = editor.getSelectedLineRange();
}
var lineText = editor.getTextInRange(start, len);
if (lineText.endsWith("\n")) { // trailing LF doesn't count
	lineText = lineText.slice(0, -1);
	len -= 1;
}

// Split into lines and add the quotation formatting.
var lines = lineText.split('\n');
lines.forEach((line, i) => lines[i] = "> " + line);
	
// Replace the text in the editor and select it.
var replacement = lines.join('\n')
editor.setTextInRange(start, len, replacement);
editor.setSelectedRange(start, replacement.length);
editor.activate();