chore: Handle euc in the repo view command

Signed-off-by: Awiteb <a@4rs.nl>

src/nostr_utils/traits.rs

@@ -33,4 +33,17 @@ impl Tags {
     {
         self.map_tag(kind, f).unwrap_or_default()
     }
+
+    /// Finds the first standard tag of the given kind with the specified
+    /// marker, then applies the function to the tag and returns the result.
+    pub fn map_marker<T>(
+        &self,
+        kind: TagKind,
+        marker: &str,
+        f: impl FnOnce(&TagStandard) -> T,
+    ) -> Option<T> {
+        self.filter_standardized(kind)
+            .find(|t| (*t).clone().to_vec().last().is_some_and(|m| m == marker))
+            .map(f)
+    }
 }

src/nostr_utils/utils.rs

@@ -18,6 +18,7 @@ use std::{fmt, str::FromStr};
 
 use nostr::{
     event::{Event, TagKind, TagStandard},
+    filter::{Alphabet, SingleLetterTag},
     nips::nip34::GitRepositoryAnnouncement,
 };
 
@@ -28,6 +29,11 @@ fn tag_value(tag: &TagStandard) -> String {
     tag.clone().to_vec().remove(1)
 }
 
+/// Parses the tag value into type `T` if possible.
+fn parse_value<T: FromStr>(tag: &TagStandard) -> Option<T> {
+    tag_value(tag).parse().ok()
+}
+
 /// Gets all values from the tag. If any value fails to parse, returns an empty
 /// vector.
 fn tag_values<T>(tag: &TagStandard) -> Vec<T>
@@ -56,7 +62,13 @@ pub fn event_into_repo(event: Event, repo_id: impl Into<String>) -> GitRepositor
         id:          repo_id.into(),
         name:        tags.map_tag(TagKind::Name, tag_value),
         description: tags.map_tag(TagKind::Description, tag_value),
-        euc:         None,
+        euc:         tags
+            .map_marker(
+                TagKind::SingleLetter(SingleLetterTag::lowercase(Alphabet::R)),
+                "euc",
+                parse_value,
+            )
+            .flatten(),
         web:         tags.dmap_tag(TagKind::Web, tag_values),
         clone:       tags.dmap_tag(TagKind::Clone, tag_values),
         relays:      tags.dmap_tag(TagKind::Relays, tag_values),