Add algolia-powered search bar to docs site (#917)

* add search bar

* replace cmd+k with slash hotkey

* update api key

* add localhost support for search

2 files changed, 190 insertions, 0 deletions

diff --git a/docs/src/components/Search.css b/docs/src/components/Search.css
new file mode 100644
index 000000000..53ca9bfd0
--- /dev/null
+++ b/docs/src/components/Search.css
@@ -0,0 +1,93 @@
+:root {
+  --docsearch-primary-color: var(--theme-accent);
+  --docsearch-logo-color: var(--theme-text);
+}
+
+.search {
+  display: none;
+  position: relative;
+  z-index: 10;
+  flex-grow: 1;
+  grid-area: search;
+  padding-left: 0.75rem;
+  padding-right: 0.7rem;
+  display: flex;
+  width: 400px;
+  max-width: 400px;
+}
+.search > * {
+  flex-grow: 1;
+}
+
+.search > :global(.algolia-autocomplete) {
+  width: 100%;
+}
+
+:global(body.is-nav-open) .search {
+  display: flex;
+}
+
+.search-input {
+  flex-grow: 1;
+  box-sizing: border-box;
+  width: 100%;
+  margin: 0;
+  padding: 0.33em 0.5em;
+  overflow: visible;
+  font-weight: 500;
+  font-size: 100%;
+  font-family: inherit;
+  line-height: inherit;
+  background-color: var(--theme-divider);
+  border-color: var(--theme-divider);
+  color: var(--theme-text-light);
+  border-style: solid;
+  border-width: 1px;
+  border-radius: 0.25rem;
+  outline: 0;
+  cursor: pointer;
+  transition-timing-function: ease-out;
+  transition-duration: 0.2s;
+  transition-property: border-color, background-color;
+  -webkit-font-smoothing: antialiased;
+}
+.no-underline {
+  text-decoration: none;
+}
+.search-input:hover {
+  color: var(--theme-text);
+}
+.search-input:hover::placeholder {
+  color: var(--theme-text-light);
+}
+.search-input::placeholder {
+  color: var(--theme-text-light);
+}
+
+.search-hint {
+  position: absolute;
+  top: 7px;
+  right: 19px;
+  padding: 3px 5px;
+  display: none;
+  display: none;
+  align-items: center;
+  justify-content: center;
+  letter-spacing: 0.125em;
+  color: var(--theme-text-light);
+  font-size: 13px;
+  font-family: var(--font-mono);
+  pointer-events: none;
+  border-color: var(--theme-text-lighter);
+  color: var(--theme-text-light);
+  border-style: solid;
+  border-width: 1px;
+  border-radius: 0.25rem;
+  line-height: 14px;
+}
+
+@media (min-width: 50em) {
+  .search-hint {
+    display: flex;
+  }
+}
\ No newline at end of file
diff --git a/docs/src/components/Search.tsx b/docs/src/components/Search.tsx
new file mode 100644
index 000000000..066699fc1
--- /dev/null
+++ b/docs/src/components/Search.tsx
@@ -0,0 +1,97 @@
+/* jsxImportSource: react */
+import { useState, useCallback, useRef } from 'react'
+import { createPortal } from 'react-dom'
+import { DocSearchModal, useDocSearchKeyboardEvents } from '@docsearch/react'
+import '@docsearch/css//dist/style.css';
+import './Search.css';
+
+
+export function Search() {
+  const [isOpen, setIsOpen] = useState(false)
+  const searchButtonRef = useRef()
+  const [initialQuery, setInitialQuery] = useState(null)
+
+  const onOpen = useCallback(() => {
+    setIsOpen(true)
+  }, [setIsOpen])
+
+  const onClose = useCallback(() => {
+    setIsOpen(false)
+  }, [setIsOpen])
+
+  const onInput = useCallback(
+    (e) => {
+      setIsOpen(true)
+      setInitialQuery(e.key)
+    },
+    [setIsOpen, setInitialQuery]
+  )
+
+  useDocSearchKeyboardEvents({
+    isOpen,
+    onOpen,
+    onClose,
+    onInput,
+    searchButtonRef,
+  })
+
+  return (
+    <>
+      <button
+        type="button"
+        ref={searchButtonRef}
+        onClick={onOpen}
+        className="search-input"
+      >
+        <svg
+          width="24"
+          height="24"
+          fill="none"
+        >
+          <path
+            d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"
+            stroke="currentColor"
+            strokeWidth="2"
+            strokeLinecap="round"
+            strokeLinejoin="round"
+          />
+        </svg>
+        <span>
+          Search
+        </span>
+        <span
+          className="search-hint"
+        >
+          <span className="sr-only">Press </span>
+          <kbd>/</kbd>
+          <span className="sr-only"> to search</span>
+        </span>
+      </button>
+      {isOpen &&
+        createPortal(
+          <DocSearchModal
+            initialQuery={initialQuery}
+            initialScrollY={window.scrollY}
+            onClose={onClose}
+            indexName="astro"
+            apiKey="0f387260ad74f9cbf4353facd29c919c"
+            transformItems={(items) => {
+              return items.map((item) => {
+                // We transform the absolute URL into a relative URL to
+                // work better on localhost, preview URLS.
+                const a = document.createElement('a')
+                a.href = item.url
+                console.log(a.hash);
+                const hash = a.hash === '#overview' ? '' : a.hash
+                return {
+                  ...item,
+                  url: `${a.pathname}${hash}`,
+                }
+              })
+            }}
+          />,
+          document.body
+        )}
+    </>
+  )
+}
\ No newline at end of file