Add style sheet to the feed

Based on the code proposed in PR 70 of the atom-syndication crate.

Signed-off-by: Jacob Kiers <jacob@jacobkiers.net>

Cargo.lock

@@ -29,8 +29,7 @@ checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 [[package]]
 name = "atom_syndication"
 version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "21fb6a0b39c6517edafe46f8137e53c51742425a4dae1c73ee12264a37ad7541"
+source = "git+https://github.com/jacobkiers/atom-syndication?rev=add7083b56b9d737f0fa1d3383aa82789b6c38ad#add7083b56b9d737f0fa1d3383aa82789b6c38ad"
 dependencies = [
  "chrono",
  "derive_builder",

Cargo.toml

@@ -19,3 +19,6 @@ imap = { version = "^2.4.1", default-features = false }
 mail-parser = "^0.8.0"
 rustls-connector = { version = "^0.16.1", default-features = false, features = [ "webpki-roots-certs", "quic" ] }
 sha2 = "^0.10.2"
+
+[patch.crates-io]
+atom_syndication = { git = "https://github.com/jacobkiers/atom-syndication", rev = "add7083b56b9d737f0fa1d3383aa82789b6c38ad" }

resources/feed.xsl

@@ -26,6 +26,7 @@
         </section>
         <section>
           <h2>Recent Items</h2>
+          <p>Last updated on <xsl:apply-templates select="atom:feed/atom:updated" /></p>
           <xsl:apply-templates select="atom:feed/atom:entry" />
         </section>
       </body>

src/feed.rs

@@ -2,6 +2,7 @@ use crate::Message;
 
 use atom_syndication::{
     ContentBuilder, Entry, EntryBuilder, Feed, FeedBuilder, Generator, LinkBuilder, Person,
+    WriteConfig,
 };
 use chrono::{DateTime, TimeZone, Utc};
 
@@ -82,6 +83,19 @@ pub(crate) fn build_atom_feed(hostname: &String, feed_file: &str) -> Feed {
         .build()
 }
 
+pub(crate) fn write_feed<W: std::io::Write>(
+    feed: Feed,
+    mut out: W,
+) -> Result<W, atom_syndication::Error> {
+    let _ = writeln!(out, r#"<?xml version="1.0"?>"#);
+    let _ = writeln!(out, r#"<?xml-stylesheet href="feed.xsl" type="text/xsl"?>"#);
+    let config = WriteConfig {
+        write_document_declaration: false,
+        ..Default::default()
+    };
+    feed.write(out, config)
+}
+
 //#[derive(Serialize, Deserialize, Debug)]
 pub(crate) struct Newsletter {
     id: String,

src/main.rs

@@ -113,14 +113,9 @@ fn build_feed(filename: &PathBuf, hostname: String, include_html: bool) -> Resul
         feed.set_updated(Utc::now());
         println!("Writing feed to {}", filename.display());
 
-        // TODO: Ugly hack because atom_syndication crate does not support style sheets.
-        let feed_str = feed.to_string().as_str().replace(">\n<feed", ">\n<?xml-stylesheet href=\"feed.xsl\" type=\"text/xsl\"?>\n<feed");
-        let _ = write_file(filename, feed_str)?;
-        let _ = write_file(dir.join("feed.xsl"), FEED_STYLESHEET)?;
-
-        // Another ugly hack, but I don't know how to do this better...
-        let file_name = format!("{:?}", filename.file_name().unwrap()).replace('"', "");
-        write_file(dir.join("index.html"), INDEX_HTML.replace("{FEED}", file_name.as_str()))?;
+        feed::write_feed(feed, open_file(filename).unwrap())?;
+        write_file(dir.join("feed.xsl"), FEED_STYLESHEET)?;
+        write_file(dir.join("index.html"), INDEX_HTML.replace("{FEED}", feed_file))?;
     }
 
     println!("Finished building the feed.");
@@ -209,12 +204,16 @@ fn process_html(input: &str) -> Result<String, ()> {
     Ok(input.replace("src", "data-source"))
 }
 
-fn write_file<P: Into<PathBuf>, D: AsRef<[u8]>>(html_path: P, data: D) -> Result<(), std::io::Error> {
-    let path : PathBuf = html_path.into();
+fn open_file<P: Into<PathBuf>>(path: P) -> std::io::Result<std::fs::File> {
     OpenOptions::new()
         .write(true)
         .create(true)
-        .open(&path)
-        .expect(format!("Could not open file '{}' for writing", &path.display()).as_str())
+        .open(path.into())
+}
+
+fn write_file<P: Into<PathBuf>, D: AsRef<[u8]>>(path: P, data: D) -> Result<(), std::io::Error> {
+    let path: PathBuf = path.into();
+    open_file(path.clone())
+        .unwrap_or_else(|_| panic!("Could not open file '{}' for writing", &path.display()))
         .write_all(data.as_ref())
-}
+}