plakken/static/app.js

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JavaScript
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const codeEditor = document.getElementById('content');
const lineCounter = document.getElementById('lines');
let lineCountCache = 0;
// Update line counter
function updateLineCounter() {
const lineCount = codeEditor.value.split('\n').length;
if (lineCountCache !== lineCount) {
const outarr = Array.from({length: lineCount}, (_, index) => index + 1);
lineCounter.value = outarr.join('\n');
}
lineCountCache = lineCount;
}
codeEditor.addEventListener('input', updateLineCounter);
codeEditor.addEventListener('keydown', (e) => {
if (e.key === 'Tab') {
e.preventDefault();
const {value, selectionStart, selectionEnd} = codeEditor;
codeEditor.value = `${value.slice(0, selectionStart)}\t${value.slice(selectionEnd)}`;
codeEditor.setSelectionRange(selectionStart + 1, selectionStart + 1);
updateLineCounter();
}
});
updateLineCounter();