2026-09-17 15:35:21 +00:00
3 changed files with 85 additions and 1 deletions
@@ -288,6 +288,8 @@ html[data-wrap] .float { overflow-x: hidden; }
 /* gutter/code share line metrics; the editor gutter keeps its own padding (#50) */
 .code .gutter { padding-top: 0; padding-bottom: 0; }
 .codebody { padding: 0 18px; white-space: pre; }
 /* #167: each logical line is its own block so offsetTop identifies its first visual row */
 .codeline { display: block; }
 /* syntax highlight tokens (#1) */
 .tok-kw { color: #c792ea; }
 .tok-str { color: #a5e075; }
@@ -0,0 +1,81 @@
 // #167: with line wrapping on, a logical line can occupy several visual
 // lines; the gutter must show one number per VISUAL line. Per-line spans
 // give each logical line its own box so offsetTop order stays correct even
 // when highlighting spans cross no line boundaries.
 (function () {
  var body = document.getElementById('codebody');
  var gutter = document.getElementById('gutter');
  var code = document.getElementById('code');
  if (!body || !gutter || !code) return;
  var wrapOn = function () {
    return document.documentElement.hasAttribute('data-wrap');
  };
  // Wrap each logical line (split on newline; spans never contain newlines
  // because HighlightCode highlights per line) in a .codeline block.
  function splitLines() {
    var html = body.innerHTML;
    var parts = html.split('\n');
    var out = [];
    for (var i = 0; i < parts.length; i++) {
      out.push('<span class="codeline">' + parts[i] + '</span>');
    }
    body.innerHTML = out.join('\n');
  }
  function renumber() {
    var lines = body.querySelectorAll('.codeline');
    var s = '';
    if (wrapOn() && lines.length) {
      // Each logical line block occupies rows = height / line-height when
      // wrapped; its number sits on the first row and the remaining rows get
      // blank gutter lines so numbers stay aligned with line starts.
      // The code column width must not change while measuring (the gutter is
      // flex-shrink:0 so its own row count never affects it), and renumber
      // must be idempotent to avoid a ResizeObserver feedback loop.
      var lh = parseFloat(getComputedStyle(body).lineHeight) || 1;
      gutter.textContent = '';
      var frag = document.createDocumentFragment();
      for (var i = 0; i < lines.length; i++) {
        var num = document.createElement('span');
        num.className = 'gutline';
        num.textContent = String(i + 1);
        frag.appendChild(num);
        var rows = Math.max(1, Math.round(lines[i].getBoundingClientRect().height / lh));
        for (var r = 1; r < rows; r++) {
          var blank = document.createElement('span');
          blank.className = 'gutline';
          blank.textContent = '\u00a0';
          frag.appendChild(blank);
        }
      }
      gutter.appendChild(frag);
    } else {
      for (var k = 1; k <= lines.length; k++) s += k + '\n';
      gutter.textContent = lines.length ? s.slice(0, -1) : '1';
    }
  }
  splitLines();
  renumber();
  // Re-renumber on toggle (theme.js toggles data-wrap on <html>) and on any
  // size change (paste of lots of text, window resize, zoom). Only width
  // changes of the code column affect wrapping, so observe width only —
  // height changes caused by our own renumbering must not re-trigger.
  var mo = new MutationObserver(renumber);
  mo.observe(document.documentElement, { attributes: true, attributeFilter: ['data-wrap'] });
  var lastW = body.getBoundingClientRect().width;
  if (window.ResizeObserver) {
    var ro = new ResizeObserver(function () {
      var w = body.getBoundingClientRect().width;
      if (Math.abs(w - lastW) < 0.5) return;
      lastW = w;
      renumber();
    });
    ro.observe(body);
  } else {
    window.addEventListener('resize', renumber);
  }
 })();
@@ -55,9 +55,10 @@
  </div>
  {{end}}
  <div class="float">
-    <div class="code"><div class="gutter">{{.Gutter}}</div><div class="codebody" id="codebody">{{.ContentHTML}}</div></div>
+    <div class="code" id="code"><div class="gutter" id="gutter">{{.Gutter}}</div><div class="codebody" id="codebody">{{.ContentHTML}}</div></div>
  </div>
 </div>
 <input type="hidden" id="raw-content" value="{{.ContentAttr}}">
 <script src="/static/paste.js" defer data-paste-id="{{.ID}}"></script>
 <script src="/static/paste-lines.js" defer></script>
 {{template "foot" .}}