Support gallery code block

demo/issue-1/first.md

@@ -1,4 +1,3 @@
-
 # The first article of Issue 1
 
 Hello Zine.
@@ -17,4 +16,9 @@ Text 2
 fn main() {
     println!("{}", "Hello, Zine!");
 }
-```
+```
+
+```gallery
+/static/duck.png
+/static/zine.png
+```

src/code_blocks/gallery.rs

@@ -0,0 +1,32 @@
+use std::fmt::Write;
+
+use super::CodeBlock;
+
+pub struct GalleryBlock<'a> {
+    images: Vec<&'a str>,
+}
+
+// enum GalleryMode {
+//     Grid,
+//     Slide,
+// }
+
+impl<'a> GalleryBlock<'a> {
+    pub fn new(block: &'a str) -> Self {
+        let images = block.lines().collect();
+        GalleryBlock { images }
+    }
+}
+
+impl<'a> CodeBlock for GalleryBlock<'a> {
+    fn render(&self) -> anyhow::Result<String> {
+        let mut html = String::new();
+
+        writeln!(&mut html, r#"<div class="gallery">"#)?;
+        for image in &self.images {
+            writeln!(&mut html, r#"<p><img src="{}" /></p>"#, image)?;
+        }
+        writeln!(&mut html, r#"</div>"#)?;
+        Ok(html)
+    }
+}

src/code_blocks/mod.rs

@@ -4,10 +4,12 @@ use anyhow::{bail, Result};
 
 mod author;
 mod callout;
+mod gallery;
 mod url_preview;
 
 use crate::{data, engine::Vistor, helpers, html};
 pub use author::AuthorCode;
+use gallery::GalleryBlock;
 use url_preview::{UrlPreviewBlock, UrlPreviewError};
 
 use self::callout::CalloutBlock;
@@ -17,9 +19,10 @@ pub trait CodeBlock {
 }
 
 const CALLOUT: &str = "callout";
+const GALLERY: &str = "gallery";
 const URL_PREVIEW: &str = "urlpreview";
 
-const ALL_CODE_BLOCKS: &[&str] = &[CALLOUT, URL_PREVIEW];
+const ALL_CODE_BLOCKS: &[&str] = &[CALLOUT, GALLERY, URL_PREVIEW];
 
 #[derive(Debug, Default, PartialEq, Eq)]
 pub struct Fenced<'a> {
@@ -78,6 +81,10 @@ impl<'a> Fenced<'a> {
                     .unwrap();
                 Some(html)
             }
+            GALLERY => {
+                let html = GalleryBlock::new(block).render().unwrap();
+                Some(html)
+            }
             _ => None,
         }
     }