feat: add plugin code

Signed-off-by: Stefan Pfaffel <s.pfaffel@gmail.com>

src/components/observer.js

@@ -0,0 +1,42 @@
+import { useRouter } from '@vuepress/client'
+import { nextTick, onMounted, onUnmounted, ref } from 'vue'
+
+export default (selector) => {
+    const router = useRouter()
+    const visible = ref(false)
+
+    const observerOptions = {
+        root: null,
+        rootMargin: '0px',
+        threshold: [0.0, 0.75],
+    }
+
+    function intersectionCallback(entries) {
+        entries.forEach((entry) => {
+            visible.value = entry.isIntersecting
+        })
+    }
+
+    const observer = new IntersectionObserver(intersectionCallback, observerOptions)
+
+    function observe() {
+        const element = window.document.querySelector(selector)
+        observer.observe(element)
+    }
+    function disconnect() {
+        observer.disconnect()
+    }
+
+    router.afterEach((() => {
+        disconnect()
+        nextTick(observe)
+    }))
+
+
+    onMounted(() => {
+        nextTick(observe)
+    })
+    onUnmounted(disconnect)
+
+    return visible
+}

src/components/outline.vue

@@ -0,0 +1,156 @@
+<template>
+  <Teleport to=".vp-theme-container">
+    <Transition name="outline">
+      <div v-if="visible"
+           class="anchor-right-content">
+        <ul>
+          <li class="start">
+            On this page
+          </li>
+          <template v-for="(item, index) in headers"
+                    :key="index">
+            <template v-if="item.children.length > 0">
+              <sub-menu :key="item.key"
+                        :menu-info="item" />
+            </template>
+            <template v-else>
+              <li :class="['level', 'level-' + item.level, { active: (!route.hash && index == 0) || route.hash === `#${item.slug}` }]"
+                  @click="headerClick(item)">
+                {{ item.title }}
+              </li>
+            </template>
+          </template>
+        </ul>
+      </div>
+    </Transition>
+  </Teleport>
+</template>
+
+<script setup>
+import { usePageData, useRoute, useRouter } from '@vuepress/client';
+import { computed, onMounted, ref } from 'vue';
+import observe from 'vuepress-plugin-anchor-right/src/components/observer';
+import SubMenu from 'vuepress-plugin-anchor-right/src/components/sub-menu.vue';
+
+const headers = ref([]);
+const router = useRouter();
+const route = useRoute();
+const page = usePageData()
+const isFooterVisible = observe('footer')
+
+const isRootPage = computed(() => {
+  const { path } = page.value
+  return !path || path === '/' || path === '/index' || path === '/index.html'
+})
+
+const visible = computed(() => {
+  if (isRootPage.value) {
+    return false
+  }
+  return headers.value.length > 0 && isFooterVisible.value === false
+})
+
+router.afterEach((_to, _from, failure) => {
+  if (!failure) {
+    refresh()
+  }
+})
+
+const refresh = () => {
+  const page = usePageData();
+  headers.value = page.value.headers;
+}
+
+const headerClick = (item) => {
+  router.push(`#${item.slug}`);
+};
+
+onMounted(refresh);
+</script>
+
+<style lang="scss">
+@media (max-width: 1000px) {
+  .anchor-right {
+    @apply hidden;
+  }
+
+  .sidebar-items {
+    .sidebar-item-children {
+      .sidebar-item-children {
+        @apply block;
+      }
+    }
+  }
+
+  .vp-page {
+    @apply pr-0;
+  }
+}
+
+@media (min-width: 1000px) {
+  .anchor-right {
+    @apply block;
+  }
+
+  .sidebar-items {
+    .sidebar-item-children {
+      .sidebar-item-children {
+        @apply hidden;
+      }
+    }
+  }
+
+  .vp-page {
+    @apply pr-64;
+  }
+}
+
+.anchor-right-content {
+  @apply text-lg right-0 fixed overflow-auto w-56;
+
+  top: calc(var(--navbar-height) + 2rem);
+  max-height: 84vh;
+  // border-left: #eaecef solid 1px;
+
+  ul {
+    @apply space-y-2;
+
+    li {
+      @apply block;
+      padding-top: 1px !important;
+      padding-bottom: 1px !important;
+      padding-right: 0 !important;
+
+      &.start {
+        @apply mb-8 text-lg font-medium text-gray-400
+      }
+    }
+  }
+
+  .level {
+    @apply block cursor-pointer no-underline;
+    color: #999;
+    padding: 4px 12px 4px 0;
+    margin-left: -1px;
+  }
+
+  .active {
+    color: var(--c-text-accent);
+    @apply font-medium;
+
+    .menu {
+      @apply font-normal;
+    }
+  }
+}
+
+.outline-enter-active,
+.outline-leave-active {
+  transition: opacity 0.25s ease;
+}
+
+.outline-enter-from,
+.outline-leave-to {
+  opacity: 0;
+}
+</style>

src/components/sub-menu.vue

@@ -0,0 +1,49 @@
+<script setup>
+import { useRoute, useRouter } from '@vuepress/client';
+
+const router = useRouter();
+const route = useRoute();
+
+const props = defineProps({
+  menuInfo: {
+    type: Object,
+  },
+  isFirst: {
+    type: Boolean,
+    default: false,
+  }
+});
+
+const headerClick = (item) => {
+  router.push(`#${item.slug}`);
+};
+
+</script>
+<template>
+  <li :class="[
+    'level',
+    'level-' + props.menuInfo.level,
+    { active: (isFirst && !route.hash) || route.hash === `#${props.menuInfo.slug}` },
+  ]"
+      @click.prevent="headerClick(props.menuInfo)">
+    <div>
+      {{ props.menuInfo.title }}
+    </div>
+    <ul class="menu">
+      <template v-for="(item, index) in props.menuInfo.children"
+                :key="index">
+        <sub-menu v-if="item.children.length > 0 && item.level !== 3"
+                  :key="item.key"
+                  :menu-info="item"
+                  :route="route"
+                  :router="router" />
+
+        <li v-else
+            :class="['level', 'level-' + item.level]"
+            @click.stop="headerClick(item)">
+          {{ item.title }}
+        </li>
+      </template>
+    </ul>
+  </li>
+</template>

src/config/client.js

@@ -0,0 +1,6 @@
+import { defineClientConfig } from 'vuepress/client'
+import Outline from '../components/outline.vue'
+
+export default defineClientConfig({
+  rootComponents: [Outline]
+})

src/config/node.js

@@ -0,0 +1,12 @@
+import { getDirname, path } from '@vuepress/utils'
+
+const __dirname = import.meta.dirname || getDirname(import.meta.url)
+
+export default () => {
+  return () => {
+    return {
+      name: '@discue/vuepress-plugin-outline',
+      clientConfigFile: path.resolve(__dirname, './client.js')
+    }
+  }
+}

src/index.js

@@ -0,0 +1,2 @@
+import plugin from './config/node.js'
+export default plugin