Hotodogo | Snippets: Chmod Calculator

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
    --green: #22c55e;
    --green-bg: #f0fdf4;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 24px 16px;
}

CSS Before Head

<meta name="viewport" content="width=device-width, initial-scale=1.0">

HTML Head

.container {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px;
    width: 100%;
    max-width: 560px;
}
h1 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 24px;
    color: var(--primary);
}
.numeric-input {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding: 16px;
    background: #f8fafc;
    border: 1.5px solid var(--border);
    border-radius: 8px;
}
.numeric-input label {
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    white-space: nowrap;
}
.numeric-input input {
    flex: 1;
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 1.25rem;
    font-family: "JetBrains Mono", "Courier New", monospace;
    font-weight: 600;
    text-align: center;
    color: var(--text);
    letter-spacing: 0.3em;
    transition: border-color 0.2s;
}
.numeric-input input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.permission-symbol {
    font-family: "JetBrains Mono", "Courier New", monospace;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary);
    letter-spacing: 0.15em;
    min-width: 90px;
    text-align: center;
}
.boxes {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}
.box {
    background: #f8fafc;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}
.box h2 {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 12px;
}
.box .digit {
    font-family: "JetBrains Mono", monospace;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}
.box ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.box ul li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
    font-size: 0.85rem;
    cursor: pointer;
}
.box ul li input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
    cursor: pointer;
}
.box ul li span {
    color: var(--text);
    user-select: none;
}
.box ul li input[type="checkbox"]:checked + span {
    font-weight: 600;
    color: var(--primary);
}
.result-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 18px;
    background: var(--green-bg);
    border: 1.5px solid #bbf7d0;
    border-radius: 8px;
}
.result-bar .command {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.95rem;
    font-weight: 500;
    color: #15803d;
}
.result-bar .command-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #16a34a;
}
.error-msg {
    color: #ef4444;
    font-size: 0.85rem;
    text-align: center;
    margin-top: 8px;
    min-height: 1.2em;
}

CSS After Head

JS Before HTML Body

HTML Body Attrs

<div class="container">
    <h1>Chmod Calculator</h1>

    <div class="numeric-input">
        <label>Numeric</label>
        <input type="text" id="numericInput" value="755" maxlength="3" placeholder="755">
        <div class="permission-symbol" id="symbolDisplay">rwxr-xr-x</div>
    </div>

    <div class="boxes">
        <div class="box" id="owner">
            <h2>Owner</h2>
            <div class="digit" id="ownerDigit">7</div>
            <ul>
                <li><input type="checkbox" name="owner_r" checked> <span>Read</span></li>
                <li><input type="checkbox" name="owner_w" checked> <span>Write</span></li>
                <li><input type="checkbox" name="owner_x" checked> <span>Execute</span></li>
            </ul>
        </div>
        <div class="box" id="group">
            <h2>Group</h2>
            <div class="digit" id="groupDigit">5</div>
            <ul>
                <li><input type="checkbox" name="group_r" checked> <span>Read</span></li>
                <li><input type="checkbox" name="group_w"> <span>Write</span></li>
                <li><input type="checkbox" name="group_x" checked> <span>Execute</span></li>
            </ul>
        </div>
        <div class="box" id="other">
            <h2>Other</h2>
            <div class="digit" id="otherDigit">5</div>
            <ul>
                <li><input type="checkbox" name="other_r" checked> <span>Read</span></li>
                <li><input type="checkbox" name="other_w"> <span>Write</span></li>
                <li><input type="checkbox" name="other_x" checked> <span>Execute</span></li>
            </ul>
        </div>
    </div>

    <div class="result-bar">
        <div>
            <div class="command-label">Command</div>
            <div class="command" id="commandDisplay">chmod 755</div>
        </div>
    </div>
    <div class="error-msg" id="errorMsg"></div>
</div>

HTML Body

HTML Foot

var checkboxes = document.querySelectorAll("input[type=checkbox]");
var numericInput = document.getElementById("numericInput");
var symbolDisplay = document.getElementById("symbolDisplay");
var commandDisplay = document.getElementById("commandDisplay");
var errorMsg = document.getElementById("errorMsg");

function getPermsFromCheckboxes() {
    var perms = { owner: [0,0,0], group: [0,0,0], other: [0,0,0] };
    checkboxes.forEach(function(cb) {
        if (cb.checked) {
            var parts = cb.name.split("_");
            var idx = {"r":0,"w":1,"x":2}[parts[1]];
            perms[parts[0]][idx] = 1;
        }
    });
    return perms;
}

function permsToNumeric(perms) {
    var s = "";
    for (var k in perms) {
        s += parseInt(perms[k].join(""), 2);
    }
    return s;
}

function permsToSymbol(perms) {
    var s = "";
    for (var k in perms) {
        s += perms[k][0] ? "r" : "-";
        s += perms[k][1] ? "w" : "-";
        s += perms[k][2] ? "x" : "-";
    }
    return s;
}

function updateFromCheckboxes() {
    var perms = getPermsFromCheckboxes();
    var num = permsToNumeric(perms);
    var sym = permsToSymbol(perms);
    numericInput.value = num;
    symbolDisplay.textContent = sym;
    commandDisplay.textContent = "chmod " + num;
    document.getElementById("ownerDigit").textContent = num[0];
    document.getElementById("groupDigit").textContent = num[1];
    document.getElementById("otherDigit").textContent = num[2];
    errorMsg.textContent = "";
}

function parsePermission(num) {
    var n = parseInt(num);
    if (isNaN(n) || n < 0 || n > 7) return null;
    var bin = n.toString(2);
    while (bin.length < 3) bin = "0" + bin;
    return [parseInt(bin[0]), parseInt(bin[1]), parseInt(bin[2])];
}

function updateFromNumeric() {
    var val = numericInput.value.trim();
    if (val.length === 0) {
        symbolDisplay.textContent = "---------";
        commandDisplay.textContent = "chmod ---";
        document.getElementById("ownerDigit").textContent = "-";
        document.getElementById("groupDigit").textContent = "-";
        document.getElementById("otherDigit").textContent = "-";
        checkboxes.forEach(function(cb) { cb.checked = false; });
        errorMsg.textContent = "";
        return;
    }
    if (val.length !== 3) {
        errorMsg.textContent = "Must be exactly 3 digits (0-7 each).";
        return;
    }
    for (var i = 0; i < 3; i++) {
        if (val[i] < "0" || val[i] > "7") {
            errorMsg.textContent = "Each digit must be between 0 and 7.";
            return;
        }
    }
    errorMsg.textContent = "";
    var groups = ["owner", "group", "other"];
    var perm = {};
    for (var i = 0; i < 3; i++) {
        perm[groups[i]] = parsePermission(val[i]);
    }
    var sym = permsToSymbol(perm);
    symbolDisplay.textContent = sym;
    commandDisplay.textContent = "chmod " + val;
    checkboxes.forEach(function(cb) { cb.checked = false; });
    for (var i = 0; i < 3; i++) {
        var g = groups[i];
        var p = perm[g];
        document.getElementById(g + "Digit").textContent = val[i];
        if (p[0]) document.querySelector("input[name=" + g + "_r]").checked = true;
        if (p[1]) document.querySelector("input[name=" + g + "_w]").checked = true;
        if (p[2]) document.querySelector("input[name=" + g + "_x]").checked = true;
    }
}

checkboxes.forEach(function(cb) {
    cb.addEventListener("change", updateFromCheckboxes);
});
numericInput.addEventListener("input", updateFromNumeric);
numericInput.addEventListener("focus", function() { this.select(); });

updateFromNumeric();

JS After HTML Body