support adding description meta tag to pages

using the page context
3 years ago · e1033ff0b3
parent 15f78ea632
commit e1033ff0b3
3 changed files with 18 additions and 6 deletions
--- a/src/render.rs
+++ b/src/render.rs
@ -67,7 +67,11 @@ struct PageContext {
    // The pathname part of the URL
    pathname: String,
    // The current query string
-    query: String
+    query: String,
+    // Summary of the current page
+    // regardless of its type
+    // For use in <meta> tags
+    description: String
 }

 #[derive(Serialize)]
@ -148,11 +152,12 @@ fn build_handlebars() -> Handlebars<'static> {
    return hbs;
 }

-fn build_page_context(url: &Url) -> PageContext {
+fn build_page_context(url: &Url, description: String) -> PageContext {
    PageContext {
        base_url: url.origin(),
        pathname: url.pathname(),
-        query: url.search()
+        query: url.search(),
+        description
    }
 }

@ -168,7 +173,7 @@ async fn _render_homepage(url: Url, tpl_name: &str) -> MyResult<String> {
        .map_err(|_| Error::BadRequest("Failed to parse query string".into()))?;
    let mut context = HomePageContext {
        blog: &ROOT_CONTEXT,
-        page: build_page_context(&url),
+        page: build_page_context(&url, ROOT_CONTEXT.description.into()),
        posts: vec![],
        prev: None,
        next: None
@ -225,7 +230,7 @@ pub async fn render_post(url: Url, post: blog::Post) -> MyResult<String> {
    let post_cache = blog::PostContentCache::find_or_render(&post).await;
    let context = PostContext {
        blog: &ROOT_CONTEXT,
-        page: build_page_context(&url),
+        page: build_page_context(&url, strip_html_tags(&post_cache.summary)),
        title: post.title,
        url: post.url,
        timestamp: post.timestamp,
--- a/src/utils.rs
+++ b/src/utils.rs
@ -171,4 +171,10 @@ fn default_maxage() -> u64 {
    60 * 60 * 24 * 7 // default to a week
 }

-include!(concat!(env!("OUT_DIR"), "/build_timestamp.rs"));
+include!(concat!(env!("OUT_DIR"), "/build_timestamp.rs"));
+
+// Strip HTML tags from a string via JS binding
+pub fn strip_html_tags(s: &str) -> String {
+    let js_str: JsString = s.into();
+    js_str.replace_by_pattern(&RegExp::new("(<([^>]+)>)", "ig"), "").into()
+}
--- a/theme/default/head.hbs
+++ b/theme/default/head.hbs
@ -1,6 +1,7 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="description" content="{{ page.description }}">
    <title>{{ #if title }}{{ title }} - {{ blog.title }}{{ else }}{{ blog.title }}{{ /if }}</title>
    <link rel="stylesheet" href="/static/monokai-sublime.css?ver={{ build_num }}" />
    <link rel="stylesheet" href="/static/style.css?ver={{ build_num }}" />