feat(theme): support footer frontmatter config (vuejs#2574)

Author: buqiyuan

docs/reference/default-theme-config.md

@@ -246,6 +246,7 @@ type SocialLinkIcon =
 ## footer
 
 - Type: `Footer`
+- Can be overridden per page via [frontmatter](./frontmatter-config#footer)
 
 Footer configuration. You can add a message or copyright text on the footer, however, it will only be displayed when the page doesn't contain a sidebar. This is due to design concerns.
 

docs/reference/default-theme-footer.md

@@ -41,3 +41,13 @@ Only inline elements can be used in `message` and `copyright` as they are render
 :::
 
 Note that footer will not be displayed when the [SideBar](./default-theme-sidebar) is visible.
+
+## Frontmatter Config
+
+This can be disabled per-page using the `footer` option on frontmatter:
+
+```yaml
+---
+footer: false
+---
+```

docs/reference/frontmatter-config.md

@@ -160,3 +160,16 @@ Whether to display [Edit Link](./default-theme-edit-link) in the footer of the c
 editLink: false
 ---
 ```
+
+### footer <Badge type="info" text="default theme only" />
+
+- Type: `boolean`
+- Default: `true`
+
+Whether to display [Footer](./default-theme-footer) in the footer of the current page. 
+
+```yaml
+---
+footer: false
+---
+```

src/client/theme-default/components/VPFooter.vue

@@ -2,12 +2,12 @@
 import { useData } from '../composables/data'
 import { useSidebar } from '../composables/sidebar'
 
-const { theme } = useData()
+const { theme, frontmatter } = useData()
 const { hasSidebar } = useSidebar()
 </script>
 
 <template>
-  <footer v-if="theme.footer" class="VPFooter" :class="{ 'has-sidebar': hasSidebar }">
+  <footer v-if="theme.footer && frontmatter.footer !== false" class="VPFooter" :class="{ 'has-sidebar': hasSidebar }">
     <div class="container">
       <p v-if="theme.footer.message" class="message" v-html="theme.footer.message"></p>
       <p v-if="theme.footer.copyright" class="copyright" v-html="theme.footer.copyright"></p>