From cea0f3eb743b26db0d5297ab10e229617585fe0c Mon Sep 17 00:00:00 2001
From: Jacky Zhao <j.zhao2k19@gmail.com>
Date: Thu, 05 May 2022 04:58:50 +0000
Subject: [PATCH] feat: contextual backlinks (closes #106)

---
 assets/js/popover.js |   51 +++++++++++++++++++++++++++++++++++----------------
 1 files changed, 35 insertions(+), 16 deletions(-)

diff --git a/assets/js/popover.js b/assets/js/popover.js
index 83cdc03..ea01156 100644
--- a/assets/js/popover.js
+++ b/assets/js/popover.js
@@ -5,30 +5,49 @@
   return template.content.firstChild
 }
 
-function initPopover(baseURL) {
+function initPopover(baseURL, useContextualBacklinks) {
   const basePath = baseURL.replace(window.location.origin, "")
   document.addEventListener("DOMContentLoaded", () => {
     fetchData.then(({ content }) => {
       const links = [...document.getElementsByClassName("internal-link")]
-      links.forEach(li => {
-        console.log(li.dataset)
-        const linkDest = content[li.dataset.src.replace(basePath, "")]
-        if (linkDest) {
-          const popoverElement = `<div class="popover">
+      links
+        .filter(li => li.dataset.src || (li.dataset.idx && useContextualBacklinks))
+        .forEach(li => {
+          if (li.dataset.ctx) {
+            console.log(li.dataset.ctx)
+            const linkDest = content[li.dataset.src]
+            const popoverElement = `<div class="popover">
+    <h3>${linkDest.title}</h3>
+    <p>${highlight(removeMarkdown(linkDest.content), li.dataset.ctx)}...</p>
+    <p class="meta">${new Date(linkDest.lastmodified).toLocaleDateString()}</p>
+</div>`
+            const el = htmlToElement(popoverElement)
+            li.appendChild(el)
+            li.addEventListener("mouseover", () => {
+              el.classList.add("visible")
+            })
+            li.addEventListener("mouseout", () => {
+              el.classList.remove("visible")
+            })
+          } else {
+            const linkDest = content[li.dataset.src.replace(/\/$/g, "").replace(basePath, "")]
+            if (linkDest) {
+              const popoverElement = `<div class="popover">
     <h3>${linkDest.title}</h3>
     <p>${removeMarkdown(linkDest.content).split(" ", 20).join(" ")}...</p>
     <p class="meta">${new Date(linkDest.lastmodified).toLocaleDateString()}</p>
 </div>`
-          const el = htmlToElement(popoverElement)
-          li.appendChild(el)
-          li.addEventListener("mouseover", () => {
-            el.classList.add("visible")
-          })
-          li.addEventListener("mouseout", () => {
-            el.classList.remove("visible")
-          })
-        }
-      })
+              const el = htmlToElement(popoverElement)
+              li.appendChild(el)
+              li.addEventListener("mouseover", () => {
+                el.classList.add("visible")
+              })
+              li.addEventListener("mouseout", () => {
+                el.classList.remove("visible")
+              })
+            }
+          }
+        })
     })
   })
 }

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