hnim.js

   1 (() => {
   2   const comments = document.querySelectorAll("tr.comtr");
   3   const morelink = document.querySelectorAll("a.morelink");
   4
   5   const elements = [...Array.from(comments), ...Array.from(morelink)]
   6
   7   let elementsIndex = 0;
   8   let selectedComment = elements[elementsIndex]
   9   selectedComment.style.outline = '1px dashed black';
  10
  11   const visible = (element) => {
  12     let bounds = element.getBoundingClientRect();
  13     return bounds.top >= 0 && bounds.bottom <= window.innerHeight;
  14   }
  15
  16   const changeWithVisibleCallback = (comment, callback) => {
  17     if (comment == null) {
  18       return;
  19     }
  20     selectedComment.style.outline = '';
  21     selectedComment = comment;
  22     selectedComment.style.outline = '1px dashed black';
  23     if (!visible(comment)) {
  24       callback();
  25     }
  26   }
  27
  28   const change = (comment) => {
  29     elementsIndex = elements.indexOf(comment);
  30     changeWithVisibleCallback(comment, () => {});
  31   }
  32
  33   // Curry callback for moving downpage
  34   const changeDownpage = () => {
  35     elementsIndex = Math.min(elementsIndex + 1, elements.length);
  36     changeWithVisibleCallback(elements[elementsIndex], () => {window.scrollTo(0, window.scrollY + selectedComment.offsetHeight)});
  37   }
  38
  39   // Curry callback for moving up page
  40   const changeUppage = () => {
  41     elementsIndex = Math.max(elementsIndex - 1, 0);
  42     changeWithVisibleCallback(elements[elementsIndex], () => {window.scrollTo(0, window.scrollY - selectedComment.offsetHeight)});
  43   }
  44
  45   document.addEventListener("click", (e) => {
  46     change(e.target.closest("tr.athing"));
  47   })
  48   document.addEventListener("keydown", (e) => {
  49     if (e.isComposing) {
  50       return;
  51     }
  52     switch (e.key) {
  53       case "j":
  54         do {
  55           changeDownpage();
  56         } while (selectedComment.classList.contains("noshow"));
  57         break;
  58       case "k":
  59         do {
  60           changeUppage();
  61         } while (selectedComment.classList.contains("noshow"));
  62         break;
  63       case "m":
  64       case "Enter":
  65         let togg = selectedComment.querySelector(".togg");
  66         if (togg) {
  67           togg.click();
  68         }
  69         else if (elementsIndex == elements.length - 1) {
  70           selectedComment.click();
  71         }
  72         break;
  73       case "p":
  74         while (selectedComment.querySelector("td.ind").firstElementChild.width != 0) {
  75           changeUppage();
  76         }
  77         break;
  78       default:
  79         //noop
  80     }
  81   })
  82 })();