Add markdown preview, update rust.vim

sources_non_forked/markdown-preview.nvim/app/pages/scroll.js

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+function scroll (offsetTop) {
+  [document.body, document.documentElement].forEach((ele) => {
+    // eslint-disable-next-line
+    TweenLite.to(
+      ele,
+      0.4,
+      {
+        scrollTop: offsetTop,
+        ease: Power2.easeOut // eslint-disable-line
+      }
+    )
+  })
+}
+
+function getAttrTag (line) {
+  return `[data-source-line="${line}"]`
+}
+
+function getPreLineOffsetTop (line) {
+  let currentLine = line - 1
+  let ele = null
+  while (currentLine > 0 && !ele) {
+    ele = document.querySelector(getAttrTag(currentLine))
+    if (!ele) {
+      currentLine -= 1
+    }
+  }
+  return [
+    currentLine >= 0 ? currentLine : 0,
+    ele ? ele.offsetTop : 0
+  ]
+}
+
+function getNextLineOffsetTop (line, len) {
+  let currentLine = line + 1
+  let ele = null
+  while (currentLine < len && !ele) {
+    ele = document.querySelector(getAttrTag(currentLine))
+    if (!ele) {
+      currentLine += 1
+    }
+  }
+  return [
+    currentLine < len ? currentLine : len - 1,
+    ele ? ele.offsetTop : document.documentElement.scrollHeight
+  ]
+}
+
+function topOrBottom (line, len) {
+  if (line === 0) {
+    scroll(0)
+  } else if (line === len - 1) {
+    scroll(document.documentElement.scrollHeight)
+  }
+}
+
+function relativeScroll (line, ratio, len) {
+  let offsetTop = 0
+  const lineEle = document.querySelector(`[data-source-line="${line}"]`)
+  if (lineEle) {
+    offsetTop = lineEle.offsetTop
+  } else {
+    const pre = getPreLineOffsetTop(line)
+    const next = getNextLineOffsetTop(line, len)
+    offsetTop = pre[1] + ((next[1] - pre[1]) * (line - pre[0]) / (next[0] - pre[0]))
+  }
+  scroll(offsetTop - document.documentElement.clientHeight * ratio)
+}
+
+export default {
+  relative: function ({
+    cursor,
+    winline,
+    winheight,
+    len
+  }) {
+    const line = cursor - 1
+    const ratio = winline / winheight
+    if (line === 0 || line === len - 1) {
+      topOrBottom(line, len)
+    } else {
+      relativeScroll(line, ratio, len)
+    }
+  },
+  middle: function ({
+    cursor,
+    // winline,
+    // winheight,
+    len
+  }) {
+    const line = cursor - 1
+    if (line === 0 || line === len - 1) {
+      topOrBottom(line, len)
+    } else {
+      relativeScroll(line, 0.5, len)
+    }
+  },
+  top: function ({
+    cursor,
+    winline,
+    // winheight,
+    len
+  }) {
+    let line = cursor - 1
+    if (line === 0 || line === len - 1) {
+      topOrBottom(line, len)
+    } else {
+      line = cursor - winline
+      relativeScroll(line, 0, len)
+    }
+  }
+}