TL;DR Rust (#210)

* start mara code

* better alt text

* more mara tests

* cleanups

* blog: start tl;dr rust post

* more words

* feature complete

* little oopses

* oops lol

1 files changed, 79 insertions, 0 deletions

diff --git a/src/app/markdown.rs b/src/app/markdown.rs
new file mode 100644
index 0000000..fe33a21
--- /dev/null
+++ b/src/app/markdown.rs
@@ -0,0 +1,79 @@
+use color_eyre::eyre::{Result, WrapErr};
+use comrak::nodes::{Ast, AstNode, NodeValue};
+use comrak::{format_html, parse_document, markdown_to_html, Arena, ComrakOptions};
+use std::cell::RefCell;
+use crate::templates::Html;
+use url::Url;
+
+pub fn render(inp: &str) -> Result<String> {
+    let mut options = ComrakOptions::default();
+
+    options.extension.autolink = true;
+    options.extension.table = true;
+    options.extension.description_lists = true;
+    options.extension.superscript = true;
+    options.extension.strikethrough = true;
+    options.extension.footnotes = true;
+
+    options.render.unsafe_ = true;
+
+    let arena = Arena::new();
+    let root = parse_document(&arena, inp, &options);
+
+    iter_nodes(root, &|node| {
+        let mut data = node.data.borrow_mut();
+        match &mut data.value {
+            &mut NodeValue::Link(ref mut link) => {
+                let base = Url::parse("https://christine.website/")?;
+                let u = base.join(std::str::from_utf8(&link.url.clone())?)?;
+                if u.scheme() != "conversation" {
+                    return Ok(());
+                }
+                let parent = node.parent().unwrap();
+                node.detach();
+                let mut message = vec![];
+                for child in node.children() {
+                    format_html(child, &options, &mut message)?;
+                }
+                let message = std::str::from_utf8(&message)?;
+                let message = markdown_to_html(message, &options);
+                let mood = without_first(u.path());
+                let name = u.host_str().unwrap_or("Mara");
+
+                let mut html = vec![];
+                crate::templates::mara(&mut html, mood, name, Html(message))?;
+
+                let new_node =
+                    arena.alloc(AstNode::new(RefCell::new(Ast::new(NodeValue::HtmlInline(html)))));
+                parent.append(new_node);
+
+                Ok(())
+            }
+            _ => Ok(()),
+        }
+    })?;
+
+    let mut html = vec![];
+    format_html(root, &options, &mut html).unwrap();
+
+    String::from_utf8(html).wrap_err("post is somehow invalid UTF-8")
+}
+
+fn iter_nodes<'a, F>(node: &'a AstNode<'a>, f: &F) -> Result<()>
+where
+    F: Fn(&'a AstNode<'a>) -> Result<()>,
+{
+    f(node)?;
+    for c in node.children() {
+        iter_nodes(c, f)?;
+    }
+    Ok(())
+}
+
+fn without_first(string: &str) -> &str {
+    string
+        .char_indices()
+        .nth(1)
+        .and_then(|(i, _)| string.get(i..))
+        .unwrap_or("")
+}