add: multiple pages in one entry, details syntax

app/public/app.js

@@ -349,3 +349,20 @@ globalThis.toggle_metadata_css = (e) => {
         window.location.reload();
     }
 };
+
+globalThis.hash_check = (hash) => {
+    if (hash.startsWith("#/")) {
+        for (const x of Array.from(document.querySelectorAll(".subpage"))) {
+            x.classList.add("hidden");
+        }
+
+        document.getElementById(hash).classList.remove("hidden");
+    }
+};
+
+window.addEventListener("hashchange", (_) => hash_check(window.location.hash));
+
+setTimeout(() => {
+    // run initial hash check
+    hash_check(window.location.hash);
+}, 150);

app/public/style.css

@@ -709,3 +709,20 @@ table tr:not(thead *):nth-child(odd) {
 table thead th {
     text-align: left;
 }
+
+/* details */
+details {
+    width: 100%;
+    margin: var(--pad-4) 0;
+}
+
+details summary {
+    background: var(--color-super-raised);
+    padding: var(--pad-2) var(--pad-4);
+    cursor: pointer;
+}
+
+details .content {
+    padding: var(--pad-4);
+    background: var(--color-surface);
+}

src/markdown.rs

@@ -1,11 +1,13 @@
 use std::collections::HashSet;
 
 pub fn render_markdown(input: &str) -> String {
-    let html = tetratto_shared::markdown::render_markdown_dirty(&parse_text_color(
-        &parse_highlight(&parse_link(&parse_image(&parse_image_size(
-            &parse_underline(&parse_comment(&input.replace("[/]", "<br />"))),
+    let html = tetratto_shared::markdown::render_markdown_dirty(&parse_page(&parse_details(
+        &parse_text_color(&parse_highlight(&parse_link(&parse_image(
+            &parse_image_size(&parse_underline(&parse_comment(
+                &input.replace("[/]", "<br />"),
+            ))),
         )))),
-    ))
+    )))
     .replace("$per", "%");
 
     let mut allowed_attributes = HashSet::new();
@@ -704,3 +706,180 @@ pub fn parse_image(input: &str) -> String {
 pub fn parse_link(input: &str) -> String {
     parser_ignores_pre!(parse_link_line, input)
 }
+
+/// Match page definitions.
+///
+/// Each page is denoted with two at symbols, followed by the name of the page.
+/// The page can also have an optional second argument (separated by a semicolon)
+/// which accepts the "visible" value; marking the page as visible by default.
+///
+/// To close a page (after you're done with the page's content), just put two
+/// at symbols with nothing else on the line.
+///
+/// You're able to put content AFTER the page closing line. This allows you to have
+/// persistant content which is shared between every page. Only content within pages
+/// is hidden when navigating to another page. This means everything in the entry
+/// that isn't part of a page will remian throughout navigations.
+///
+/// # Example
+/// ```md
+/// @@ home; visible
+/// this is the homepage which is shown by default!
+/// @@
+///
+/// @@ about
+/// this is the about page which is NOT shown by default! a link with an href of "#/about" will open this page
+/// @@
+/// ```
+pub fn parse_page(input: &str) -> String {
+    let mut output = String::new();
+    let mut buffer = String::new();
+    let mut page_id = String::new();
+
+    let mut start_shown = false;
+    let mut in_page = false;
+    let mut in_pre = false;
+
+    for line in input.split("\n") {
+        if line.starts_with("```") {
+            in_pre = !in_pre;
+
+            if in_page {
+                buffer.push_str(&format!("{line}\n"));
+            } else {
+                output.push_str(&format!("{line}\n"));
+            }
+
+            continue;
+        }
+
+        if in_pre {
+            if in_page {
+                buffer.push_str(&format!("{line}\n"));
+            } else {
+                output.push_str(&format!("{line}\n"));
+            }
+
+            continue;
+        }
+
+        // not in pre
+        if line == "@@" {
+            // ending block
+            if in_page {
+                output.push_str(&format!(
+                    "<div id=\"#/{page_id}\" class=\"{}subpage no_p_margin fadein\">\n{}\n</div>",
+                    if !start_shown { "hidden " } else { "" },
+                    render_markdown(&buffer) // recurse to render markdown since the renderer is ignoring the div content :/
+                ));
+
+                start_shown = false;
+                in_page = false;
+
+                buffer.clear();
+                continue;
+            }
+        } else if line.starts_with("@@") {
+            if !in_page {
+                in_page = true;
+
+                let x = line.replace("@@", "").trim().to_string();
+                let id_parts: Vec<&str> = x.split(";").map(|x| x.trim()).collect();
+                page_id = id_parts[0].to_string();
+
+                if let Some(x) = id_parts.get(1) {
+                    if *x == "visible" {
+                        start_shown = true;
+                    }
+                }
+
+                continue;
+            }
+        }
+
+        // otherwise
+        if in_page {
+            buffer.push_str(&format!("{line}\n"));
+        } else {
+            output.push_str(&format!("{line}\n"));
+        }
+    }
+
+    output
+}
+
+/// Parse the markdown syntax for the expandable `<details>` element.
+///
+/// Similar to the [`parse_page`] page definitions, details elements are denoted
+/// with two ampersand symbols. The opening line should look like `&& [summary]; [open?]`.
+///
+/// The block is closed with a line of exactly two ampersand symbols.
+///
+/// # Example
+/// ```md
+/// && other summary
+/// this element starts closed, but can be expanded
+/// &&
+/// ```
+pub fn parse_details(input: &str) -> String {
+    let mut output = String::new();
+    let mut buffer = String::new();
+    let mut summary = String::new();
+
+    let mut in_details = false;
+    let mut in_pre = false;
+
+    for line in input.split("\n") {
+        if line.starts_with("```") {
+            in_pre = !in_pre;
+
+            if in_details {
+                buffer.push_str(&format!("{line}\n"));
+            } else {
+                output.push_str(&format!("{line}\n"));
+            }
+
+            continue;
+        }
+
+        if in_pre {
+            if in_details {
+                buffer.push_str(&format!("{line}\n"));
+            } else {
+                output.push_str(&format!("{line}\n"));
+            }
+
+            continue;
+        }
+
+        // not in pre
+        if line == "&&" {
+            // ending block
+            if in_details {
+                output.push_str(&format!(
+                    "<details><summary>{summary}</summary><div class=\"content\">{}</div></details>",
+                    render_markdown(&buffer),
+                ));
+
+                in_details = false;
+                buffer.clear();
+                continue;
+            }
+        } else if line.starts_with("&&") {
+            if !in_details {
+                in_details = true;
+                summary = line.replace("&&", "").trim().to_string();
+                continue;
+            }
+        }
+
+        // otherwise
+        if in_details {
+            buffer.push_str(&format!("{line}\n"));
+        } else {
+            output.push_str(&format!("{line}\n"));
+        }
+    }
+
+    output
+}