OpenCode Workspace — Show Usage Left

On OpenCode workspace pages, show remaining usage (left) instead of used percentage.
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// ==UserScript==
// @name      OpenCode Workspace — Show Usage Left
// @name:zh-CN   OpenCode 工作区 — 显示剩余用量
// @namespace    https://opencode.ai/
// @version      0.0.1
// @description:en  Shows remaining usage (left) instead of used percentage on OpenCode workspace pages.
// @description:zh-CN  在 OpenCode 工作区页面把「已用用量」改为显示「剩余用量」（left），进度条同步反转为剩余量。
// @description  On OpenCode workspace pages, show remaining usage (left) instead of used percentage.
// @author       OpenCode (DeepSeek-V4-Flash-0731)
// @match        https://opencode.ai/workspace/*
// @grant        none
// @run-at       document-idle
// @license    MIT
// ==/UserScript==

(function () {
  "use strict";

  const dataDesc = Object.getOwnPropertyDescriptor(CharacterData.prototype, "data");
  const nodeValueDesc = Object.getOwnPropertyDescriptor(Node.prototype, "nodeValue");

  function scanValueNodes(span) {
    let numeric = null;
    let pct = null;
    const nodes = span.childNodes;
    for (let i = 0; i < nodes.length; i++) {
      const n = nodes[i];
      if (n.nodeType !== Node.TEXT_NODE) continue;
      if (n.data.trim().startsWith("%")) pct = n;
      else if (/^\d/.test(n.data)) numeric = n;
      if (numeric && pct) break;
    }
    return [numeric, pct];
  }

  function convertSpan(span) {
    if (!span) return;
    const [node, pctNode] = scanValueNodes(span);
    if (!node) return;

    if (pctNode && pctNode.data !== "% left" && dataDesc && dataDesc.set) {
      dataDesc.set.call(pctNode, "% left");
    }

    const p = parseFloat(node.data);
    if (Number.isNaN(p)) return;

    let used = span.__usageLeft;
    if (used === undefined) {
      used = p;
      span.__usageLeft = used;
    } else if (Math.abs(p + used - 100) > 0.01) {
      used = p;
      span.__usageLeft = used;
    }

    const left = Math.max(0, Math.round((100 - used) * 10) / 10);
    let out = String(left);
    if (!pctNode) out = out + (node.data.includes("%") ? "% left" : " left");
    if (node.data !== out && dataDesc && dataDesc.set) {
      dataDesc.set.call(node, out);
    }

    const item = span.closest('[data-slot="usage-item"]');
    if (item) {
      const bar = item.querySelector('[data-slot="progress-bar"]');
      if (bar) {
        const w = left + "%";
        if (bar.style.width !== w) bar.style.width = w;
      }
    }
  }

  function scan() {
    document.querySelectorAll('[data-slot="usage-value"]').forEach(convertSpan);
  }

  if (dataDesc && dataDesc.set) {
    Object.defineProperty(CharacterData.prototype, "data", {
      get: dataDesc.get,
      set: function (value) {
        dataDesc.set.call(this, value);
        if (
          this.nodeType === Node.TEXT_NODE &&
          this.parentElement &&
          this.parentElement.getAttribute("data-slot") === "usage-value"
        ) {
          convertSpan(this.parentElement);
        }
      },
      configurable: true,
    });
  }

  if (nodeValueDesc && nodeValueDesc.set) {
    Object.defineProperty(Node.prototype, "nodeValue", {
      get: nodeValueDesc.get,
      set: function (value) {
        nodeValueDesc.set.call(this, value);
        if (
          this.nodeType === Node.TEXT_NODE &&
          this.parentElement &&
          this.parentElement.getAttribute("data-slot") === "usage-value"
        ) {
          convertSpan(this.parentElement);
        }
      },
      configurable: true,
    });
  }

  const observer = new MutationObserver(scan);
  observer.observe(document.documentElement, {
    childList: true,
    subtree: true,
    attributes: true,
    attributeFilter: ["style"],
  });

  scan();
  setInterval(scan, 2000);
})();