refactor(v0): render todos with hemplate

Move the v0 todo-list payload from Rust raw HTML formatting into a hemplate partial/view and cover both populated and empty rendered structure with scraper.

req: html_safety/002

req: view/001

req: test/005

Cargo.lock

@@ -1447,6 +1447,8 @@ version = "0.1.0"
 dependencies = [
  "axum",
  "futures-util",
+ "hemplate",
+ "scraper",
  "slhx",
  "slhx-axum",
  "slhx-build",

examples/v0/Cargo.toml

@@ -10,11 +10,13 @@ path = "src/lib.rs"
 [dependencies]
 axum = "0.7"
 futures-util = "0.3"
+hemplate = { path = "../../../hemplate/hemplate" }
 slhx = { path = "../../slhx" }
 slhx-axum = { path = "../../slhx-axum" }
 tokio = { version = "1", features = ["macros", "net", "rt-multi-thread", "time"] }
 
 [dev-dependencies]
+scraper = "0.23"
 slhx-test = { path = "../../slhx-test" }
 
 [build-dependencies]

examples/v0/src/main.rs

@@ -3,6 +3,7 @@ use axum::response::IntoResponse;
 use axum::routing::get;
 use axum::Router;
 use futures_util::{stream, StreamExt};
+use hemplate::Hemplate;
 use slhx::{push, IntoEffect, SafeHtml};
 use slhx_axum::{runtime_js, sse, EffectResponse, HandlerRegistry, InteractionForm, PageRequest};
 use slhx_v0_examples::ui;
@@ -25,6 +26,17 @@ struct Todo {
     title: String,
 }
 
+#[derive(Hemplate)]
+#[hemplate = "partials"]
+struct TodoItems {
+    items: Vec<TodoItem>,
+}
+
+struct TodoItem {
+    id: u64,
+    title: String,
+}
+
 #[tokio::main]
 async fn main() {
     let state = Arc::new(ExampleState::default());
@@ -116,7 +128,7 @@ fn registry(state: Arc<ExampleState>) -> HandlerRegistry {
                     todos.push(Todo { id, title: title.into() });
                 }
                 (
-                    ui::todos::slots::todo_list.html(SafeHtml::trusted(render_todos(&todos))),
+                    ui::todos::slots::todo_list.html(render_todos(&todos)),
                     ui::todos::forms::new_todo.clear("title"),
                 )
             }
@@ -189,22 +201,53 @@ fn shell(body: String) -> String {
     )
 }
 
-fn render_todos(todos: &[Todo]) -> String {
-    if todos.is_empty() {
-        return "<li>No todos yet</li>".into();
-    }
-    todos
-        .iter()
-        .map(|todo| format!(r#"<li data-key="{}">{}</li>"#, todo.id, escape_html(&todo.title)))
-        .collect::<Vec<_>>()
-        .join("")
+fn render_todos(todos: &[Todo]) -> SafeHtml {
+    // req: html_safety/002 req: view/001
+    render_html(&TodoItems {
+        items: todos
+            .iter()
+            .map(|todo| TodoItem {
+                id: todo.id,
+                title: todo.title.clone(),
+            })
+            .collect(),
+    })
 }
 
-fn escape_html(value: &str) -> String {
-    value
-        .replace('&', "&amp;")
-        .replace('<', "&lt;")
-        .replace('>', "&gt;")
-        .replace('"', "&quot;")
-        .replace('\'', "&#39;")
+fn render_html(template: &impl Hemplate) -> SafeHtml {
+    SafeHtml::trusted(template.render().expect("v0 hemplate partial renders"))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use scraper::{Html, Selector};
+
+    fn selector(value: &str) -> Selector {
+        Selector::parse(value).expect("test selector parses")
+    }
+
+    // req: html_safety/002 req: view/001 req: test/005
+    #[test]
+    fn todos_payload_is_rendered_by_a_hemplate_view() {
+        let todos = vec![Todo { id: 7, title: "<b>Ship v0</b>".to_owned() }];
+
+        let html = render_todos(&todos);
+        let document = Html::parse_fragment(html.as_str());
+        let rows = document.select(&selector("li[data-key]")).collect::<Vec<_>>();
+        assert_eq!(rows.len(), 1);
+        assert_eq!(rows[0].value().attr("data-key"), Some("7"));
+        assert!(rows[0].text().collect::<String>().contains("<b>Ship v0</b>"));
+        assert!(document.select(&selector("b")).next().is_none());
+    }
+
+    // req: html_safety/002 req: view/001 req: test/005
+    #[test]
+    fn empty_todos_payload_is_rendered_by_a_hemplate_view() {
+        let html = render_todos(&[]);
+        let document = Html::parse_fragment(html.as_str());
+        let rows = document.select(&selector("li")).collect::<Vec<_>>();
+        assert_eq!(rows.len(), 1);
+        assert_eq!(rows[0].text().collect::<String>(), "No todos yet");
+    }
 }

examples/v0/templates/partials/todo_items.heml

@@ -0,0 +1,6 @@
+<template h-if="self.items.is_empty()">
+  <li>No todos yet</li>
+</template>
+<template h-else>
+  <li h-for="todo in &self.items" +data-key="todo.id">{+ todo.title +}</li>
+</template>