implemented also atom feed via template

web/planet-mars/src/template_engine.rs

@@ -0,0 +1,35 @@
+use crate::feed_store::FeedStore;
+use crate::to_checked_pathbuf;
+use crate::Config;
+use anyhow::Result;
+use feed_rs::model::Entry;
+use std::fs::File;
+use tera::Tera;
+
+pub fn build(config: &Config, feed_store: &FeedStore) -> Result<()> {
+    let tera = create_tera(&config.templates_dir)?;
+    let out_dir = to_checked_pathbuf(&config.out_dir);
+
+    let mut context = tera::Context::new();
+    let feed_entries: Vec<Entry> = feed_store.collect(&config.feeds);
+    context.insert("entries", &feed_entries);
+    context.insert("PKG_AUTHORS", env!("CARGO_PKG_AUTHORS"));
+    context.insert("PKG_HOMEPAGE", env!("CARGO_PKG_HOMEPAGE"));
+    context.insert("PKG_NAME", env!("CARGO_PKG_NAME"));
+    context.insert("PKG_VERSION", env!("CARGO_PKG_VERSION"));
+
+    for name in tera.get_template_names() {
+        debug!("Processing template {name}");
+        let file = File::create(format!("{}/{name}", out_dir.display()))?;
+        tera.render_to(name, &context, file)?;
+    }
+    Ok(())
+}
+
+fn create_tera(templates_dir: &str) -> Result<Tera> {
+    let dir = to_checked_pathbuf(templates_dir);
+    let mut tera = tera::Tera::new(&format!("{}/*", &dir.display()))?;
+    // disable autoescape as this would corrupt urls or the entriy contents. todo check this!
+    tera.autoescape_on(vec![]);
+    Ok(tera)
+}