refactor(theme-classic): split theme footer into smaller components + swizzle config

packages/docusaurus-theme-classic/src/getSwizzleConfig.ts

@@ -37,11 +37,62 @@ export default function getSwizzleConfig(): SwizzleConfig {
       },
       Footer: {
         actions: {
-          eject: 'unsafe', // TODO split footer into smaller parts
+          eject: 'safe',
           wrap: 'safe',
         },
         description: "The footer component of you site's layout",
       },
+      'Footer/Copyright': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description: 'The footer copyright',
+      },
+      'Footer/Layout': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description: 'The footer main layout component',
+      },
+      'Footer/LinkItem': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description: 'The footer link item component',
+      },
+      'Footer/Links': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description: 'The footer component rendering the footer links',
+      },
+      'Footer/Links/MultiColumn': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description:
+          'The footer component rendering the footer links with a multi-column layout',
+      },
+      'Footer/Links/Simple': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description:
+          'The footer component rendering the footer links with a simple layout (single row)',
+      },
+      'Footer/Logo': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description: 'The footer logo',
+      },
       IconArrow: {
         actions: {
           eject: 'safe',

packages/docusaurus-theme-classic/src/theme-classic.d.ts

@@ -205,7 +205,7 @@ declare module '@theme/DocSidebar/Desktop/Content' {
     readonly sidebar: readonly PropSidebarItem[];
   }
 
-  export default function CollapseButton(props: Props): JSX.Element;
+  export default function Content(props: Props): JSX.Element;
 }
 
 declare module '@theme/DocSidebar/Desktop/CollapseButton' {
@@ -280,6 +280,77 @@ declare module '@theme/Footer' {
   export default function Footer(): JSX.Element | null;
 }
 
+declare module '@theme/Footer/Logo' {
+  import type {FooterLogo} from '@docusaurus/theme-common';
+
+  export interface Props {
+    logo: FooterLogo;
+  }
+
+  export default function FooterLogo(props: Props): JSX.Element;
+}
+
+declare module '@theme/Footer/Copyright' {
+  export interface Props {
+    copyright: string;
+  }
+
+  export default function FooterCopyright(props: Props): JSX.Element;
+}
+
+declare module '@theme/Footer/LinkItem' {
+  import type {FooterLinkItem} from '@docusaurus/theme-common';
+
+  export interface Props {
+    item: FooterLinkItem;
+  }
+
+  export default function FooterLinkItem(props: Props): JSX.Element;
+}
+
+declare module '@theme/Footer/Layout' {
+  import type {ReactNode} from 'react';
+
+  export interface Props {
+    style: 'light' | 'dark';
+    links: ReactNode;
+    logo: ReactNode;
+    copyright: ReactNode;
+  }
+
+  export default function FooterLayout(props: Props): JSX.Element;
+}
+
+declare module '@theme/Footer/Links' {
+  import type {Footer} from '@docusaurus/theme-common';
+
+  export interface Props {
+    links: Footer['links'];
+  }
+
+  export default function FooterLinks(props: Props): JSX.Element;
+}
+
+declare module '@theme/Footer/Links/MultiColumn' {
+  import type {MultiColumnFooter} from '@docusaurus/theme-common';
+
+  export interface Props {
+    columns: MultiColumnFooter['links'];
+  }
+
+  export default function FooterLinksMultiColumn(props: Props): JSX.Element;
+}
+
+declare module '@theme/Footer/Links/Simple' {
+  import type {SimpleFooter} from '@docusaurus/theme-common';
+
+  export interface Props {
+    links: SimpleFooter['links'];
+  }
+
+  export default function FooterLinksSimple(props: Props): JSX.Element;
+}
+
 declare module '@theme/Heading' {
   import type {ComponentProps} from 'react';
 

packages/docusaurus-theme-classic/src/theme/Footer/Copyright/index.tsx

@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import type {Props} from '@theme/Footer/Copyright';
+
+export default function FooterCopyright({copyright}: Props): JSX.Element {
+  return (
+    <div
+      className="footer__copyright"
+      // Developer provided the HTML, so assume it's safe.
+      // eslint-disable-next-line react/no-danger
+      dangerouslySetInnerHTML={{
+        __html: copyright,
+      }}
+    />
+  );
+}

packages/docusaurus-theme-classic/src/theme/Footer/Layout/index.tsx

@@ -0,0 +1,34 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import clsx from 'clsx';
+import type {Props} from '@theme/Footer/Layout';
+
+export default function FooterLayout({
+  style,
+  links,
+  logo,
+  copyright,
+}: Props): JSX.Element {
+  return (
+    <footer
+      className={clsx('footer', {
+        'footer--dark': style === 'dark',
+      })}>
+      <div className="container container-fluid">
+        {links}
+        {(logo || copyright) && (
+          <div className="footer__bottom text--center">
+            {logo && <div className="margin-bottom--sm">{logo}</div>}
+            {copyright}
+          </div>
+        )}
+      </div>
+    </footer>
+  );
+}

packages/docusaurus-theme-classic/src/theme/Footer/LinkItem/index.tsx

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+import Link from '@docusaurus/Link';
+import useBaseUrl from '@docusaurus/useBaseUrl';
+import isInternalUrl from '@docusaurus/isInternalUrl';
+import IconExternalLink from '@theme/IconExternalLink';
+import type {Props} from '@theme/Footer/LinkItem';
+
+export default function FooterLinkItem({item}: Props): JSX.Element {
+  const {to, href, label, prependBaseUrlToHref, ...props} = item;
+  const toUrl = useBaseUrl(to);
+  const normalizedHref = useBaseUrl(href, {forcePrependBaseUrl: true});
+
+  return (
+    <Link
+      className="footer__link-item"
+      {...(href
+        ? {
+            href: prependBaseUrlToHref ? normalizedHref : href,
+          }
+        : {
+            to: toUrl,
+          })}
+      {...props}>
+      <span>
+        {label}
+        {href && !isInternalUrl(href) && <IconExternalLink />}
+      </span>
+    </Link>
+  );
+}

packages/docusaurus-theme-classic/src/theme/Footer/Links/MultiColumn/index.tsx

@@ -0,0 +1,53 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import type {Props} from '@theme/Footer/Links/MultiColumn';
+import LinkItem from '@theme/Footer/LinkItem';
+
+type ColumnType = Props['columns'][number];
+type ColumnItemType = ColumnType['items'][number];
+
+function ColumnLinkItem({item}: {item: ColumnItemType}) {
+  return item.html ? (
+    <li
+      className="footer__item"
+      // Developer provided the HTML, so assume it's safe.
+      // eslint-disable-next-line react/no-danger
+      dangerouslySetInnerHTML={{
+        __html: item.html,
+      }}
+    />
+  ) : (
+    <li key={item.href || item.to} className="footer__item">
+      <LinkItem item={item} />
+    </li>
+  );
+}
+
+function Column({column}: {column: ColumnType}) {
+  return (
+    <div className="col footer__col">
+      <div className="footer__title">{column.title}</div>
+      <ul className="footer__items">
+        {column.items.map((item, i) => (
+          <ColumnLinkItem key={i} item={item} />
+        ))}
+      </ul>
+    </div>
+  );
+}
+
+export default function FooterLinksMultiColumn({columns}: Props): JSX.Element {
+  return (
+    <div className="row footer__links">
+      {columns.map((column, i) => (
+        <Column key={i} column={column} />
+      ))}
+    </div>
+  );
+}

packages/docusaurus-theme-classic/src/theme/Footer/Links/Simple/index.tsx

@@ -0,0 +1,44 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import type {Props} from '@theme/Footer/Links/Simple';
+import LinkItem from '@theme/Footer/LinkItem';
+
+function Separator() {
+  return <span className="footer__link-separator">·</span>;
+}
+
+function SimpleLinkItem({item}: {item: Props['links'][number]}) {
+  return item.html ? (
+    <span
+      className="footer__link-item"
+      // Developer provided the HTML, so assume it's safe.
+      // eslint-disable-next-line react/no-danger
+      dangerouslySetInnerHTML={{
+        __html: item.html,
+      }}
+    />
+  ) : (
+    <LinkItem item={item} />
+  );
+}
+
+export default function FooterLinksSimple({links}: Props): JSX.Element {
+  return (
+    <div className="footer__links text--center">
+      <div className="footer__links">
+        {links.map((item, i) => (
+          <React.Fragment key={i}>
+            <SimpleLinkItem item={item} />
+            {links.length !== i + 1 && <Separator />}
+          </React.Fragment>
+        ))}
+      </div>
+    </div>
+  );
+}

packages/docusaurus-theme-classic/src/theme/Footer/Links/index.tsx

@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+
+import {isMultiColumnFooterLinks} from '@docusaurus/theme-common';
+import type {Props} from '@theme/Footer/Links';
+import FooterLinksMultiColumn from '@theme/Footer/Links/MultiColumn';
+import FooterLinksSimple from '@theme/Footer/Links/Simple';
+
+export default function FooterLinks({links}: Props): JSX.Element {
+  return isMultiColumnFooterLinks(links) ? (
+    <FooterLinksMultiColumn columns={links} />
+  ) : (
+    <FooterLinksSimple links={links} />
+  );
+}