Implement 'gallery-nav' fragment type

This type is for showing a list of pages as clickable image previews.
Each line in the fragment is an internal page link, followed by a '::'
separator, followed by the name of an image file. Image files must be
stored inside the '/images/thumb/' directory of the generated website.

1 files changed, 17 insertions, 1 deletions

diff --git a/src/generate_html.rs b/src/generate_html.rs
index f63614b..dca68f7 100644
--- a/src/generate_html.rs
+++ b/src/generate_html.rs
@@ -212,8 +212,24 @@ pub fn document_to_html(document: &MarkdownDocument, page: &Page, website: &Webs
                         let thumb = format!("{root}images/thumb/{file}");
                         html!("<a href='{large}'><img src='{thumb}' /></a>");
                     }),
+                    "gallery-nav" => wrap!("div", "class='gallery-nav'", for line in content.lines() {
+                        let line = line.trim();
+                        if let Some((name, image)) = line.split_once("::") {
+                            let name = name.trim();
+                            let image = image.trim();
+                            let ParsedLink { path, class, label } = parse_internal_link(name, page, website);
+                            if website.has_image(image) {
+                                let thumb = format!("{root}images/thumb/{image}");
+                                html!("<a href='{path}' class='{class}'><img src='{thumb}'/><p>{label}</p></a>")
+                            } else {
+                                warn!("Gallery-nav on page {from:?} references nonexistent image {image:?}");
+                            }
+                        } else {
+                            warn!("Gallery-nav on page {from:?} has line without a '::' separator");
+                        }
+                    }),
                     _ => {
-                        html!("<pre class='{}'>", language);
+                        html!("<pre class='{language}'>");
                         html!("{}", sanitize_text(content, false));
                         html!("</pre>");
                     },