merge fetched RSS namespaces as much as possible and warn about conflicts to stderrHEADmain

1 files changed, 21 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index 2f1435b..1cc6c5c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -58,6 +58,27 @@ fn generate_channel(urls: Vec<String>, config: Config) -> Channel {
     let mut channel = make_new_empty_channel(config);
     block_on(async {
         retrieve(urls.iter().map(AsRef::as_ref)).await.for_each(|c| {
+            for (prefix, uri) in c.namespace {
+                let existing_namespace = channel.namespace.iter().find(|(p, u)| p == prefix);
+                if let Some(existing_namespace) = existing_namespace {
+                    if existing_namespace.1.trim().len() == 0 {
+                        existing_namespace.1 = uri;
+                    } else if uri.len() > 0 {
+                        eprintln!(
+                            "Warning: channel {0} has namespace xmlns:{1}=\"{2}\", but the aggregated feed already has xmlns:{1}=\"{3}\". Ignoring.",
+                            c.link,
+                            prefix,
+                            existing_namespace.1,
+                            uri);
+                    } else {
+                        eprintln!(
+                            "Appending namespace xmlns:{0}=\"{1}\" from channel {2}.",
+                            prefix,
+                            uri,
+                            c.link);
+                        channel.namespace.insert(prefix, uri);
+                    }
+            }
             channel.items.append(&mut items_with_source(c));
             future::ready(())
         }).await;