Append to Selected Lines

script

(() => {
	const indexPlaceholder = '[X]';
	
	// Define the text that's going to be numbered.
	let st, len;
	if (editor.getSelectedRange()[1] > 0) { // use selected lines
		[st, len] = editor.getSelectedLineRange();
	}
	else { // use full text
		[st, len] = [0, editor.getText().length];
	}
	
	// Ask for the text to append
	let p = Prompt.create();
	p.title = "Append to Lines";
	p.message = indexPlaceholder + " will be replaced with the index (number) of the line"
	p.addTextField("appendText", "Append", "");
	p.addTextField("appendPrefix", "Before Text", " "); //default to adding a space before the text to be appended
	p.addButton("OK");
	
	let promptOk = p.show();
	if (!promptOk) {
		return;
	}
	
	let appendText = p.fieldValues["appendPrefix"] +  p.fieldValues["appendText"];
	
	let lnText = editor.getTextInRange(st, len).trim();
	
	// Break the text into lines and append to them
	let lines = lnText.split('\n');
	let newLines = [];
	lines.forEach(function(line, index) {
		let thisAppend = appendText.replace(indexPlaceholder, index);
		newLines.push(line + thisAppend);
	});
	
	// Replace the original text with the appended text
	let newText = newLines.join('\n');
	editor.setTextInRange(st, len, newText);
	editor.setSelectedRange(st, newText.length);
})();