1 files changed, 72 insertions, 0 deletions
diff --git a/src/generate_rss.rs b/src/generate_rss.rs
new file mode 100644
index 0000000..48a6917
--- /dev/null
+++ b/src/generate_rss.rs
@@ -0,0 +1,72 @@
+use crate::*;
+
+use std::collections::VecDeque;
+
+use chrono::{DateTime, Utc, Local};
+
+
+pub fn generate_rss(feed: &Feed, website: &Website) -> String {
+    let path = &feed.source_path;
+    let content = std::fs::read_to_string(path).unwrap();
+    let mut lines: VecDeque<&str> = content.lines().collect();
+    let base_url = website.config.get("rss.base_url");
+    if base_url.is_empty() {
+        warn!("No value was given for 'rss.base_url' key in toaster.conf");
+    }
+    let (parent_url, _) = feed.url.split_once('/').unwrap();
+
+    let channel_title = lines.pop_front().unwrap_or("No title");
+    let last_build_date = match feed.last_modified {
+        Some(system_time) => system_time.into(),
+        None => Utc::now(),
+    }.to_rfc2822();
+    let mut all_entries = String::new();
+
+    for line in &lines {
+        if line.is_empty() { continue }
+        if let Some((timestamp, name)) = line.split_once("::") {
+            let mut timestamp = timestamp.to_string();
+            let entry_title = name;
+            if !timestamp.contains('T') {
+                timestamp.push_str("T00:00:00");
+            }
+            if !timestamp.contains('Z') || timestamp.contains('+') {
+                let offset = Local::now().offset().to_string();
+                timestamp.push_str(&offset);
+            }
+            let Ok(entry_time) = DateTime::parse_from_rfc3339(&timestamp) else {
+                warn!("Invalid timestamp in RSS file {path:?}: {timestamp:?}");
+                continue;
+            };
+            let entry_link = format!("{base_url}/{parent_url}/{}.html", to_slug(name));
+
+            // Check that child page exists.
+            if let None = website.has_page(feed, name, "html") {
+                warn!("Feed {feed:?} contains link to nonexistent page {name:?}");
+            }
+
+
+            let entry_string = format!("
+    <item>
+      <title>{entry_title}</title>
+      <link>{entry_link}</link>
+      <pubDate>{entry_time}</pubDate>
+    </item>
+");
+            all_entries.push_str(&entry_string);
+        } else {
+            warn!("Invalid line in RSS file {path:?}: {line:?}");
+        }
+    }
+
+    format!(
+r#"<?xml version="1.0" encoding="UTF-8" ?>
+<rss version="2.0">
+  <channel>
+    <title>{channel_title}</title>
+    <link>{base_url}</link>
+    <lastBuildDate>{last_build_date}</lastBuildDate>
+{all_entries}
+  </channel>
+</rss>"#)
+}