Blockquote

script

// declare a few variables
let selText,
	newSelLength,
	lastLine = '',
	quoteStr = '> ';

// get the selected lines of text or the full text of the draft if none
let selRange = editor.getSelectedRange();
let selLength = selRange[1];
let selLineRange = editor.getSelectedLineRange();
if (selLength !== 0) {
	selText = editor.getTextInRange(selLineRange[0], selLineRange[1]);
	newSelLength = selLength;
} else {
	selText = editor.getText();
	newSelLength = selText.length;
}

// split the text into an array
let lines = selText.split('\n');

// prepend the quote string to each line and rejoin the lines of text
for (let i = 0; i < lines.length - 1; i++) {
	lines[i] = quoteStr + lines[i];
	newSelLength += quoteStr.length;
}
if (lines[lines.length - 1] !== '') {
	lines[lines.length - 1] = quoteStr + lines[lines.length - 1];
	newSelLength += quoteStr.length;
}
selText = lines.join('\n');

// update the draft and selection
if (selLength !== 0) {
	editor.setTextInRange(selLineRange[0], selLineRange[1], selText);
	editor.setSelectedRange(selLineRange[0], newSelLength);
} else {
	editor.setText(selText);
	editor.setSelectedRange(0, newSelLength);
}