first commit

src/web.rs

@@ -346,6 +346,8 @@ struct FeedRow {
     entries: i64,
     downloaded: i64,
     unread: i64,
+    /// Including you. More than one means every file here is shared.
+    subscribers: i64,
 }
 
 async fn feeds(
@@ -363,6 +365,7 @@ async fn feeds(
         .into_iter()
         .map(|s| (s.feed_id.clone(), s))
         .collect();
+    let counts = state.ctx.db.subscriber_counts()?;
     let mut out = Vec::with_capacity(mine.len());
     for sub in &subs {
         let (id, feed) = (&sub.id, &sub.cfg);
@@ -400,6 +403,7 @@ async fn feeds(
             entries: s.entries,
             downloaded: s.downloaded,
             unread: state.ctx.db.unread_count(user.id, id)?,
+            subscribers: counts.get(id).copied().unwrap_or(0),
         });
     }
     Ok(Json(out))
@@ -822,15 +826,46 @@ async fn download_now(
     Ok(StatusCode::ACCEPTED)
 }
 
+#[derive(Deserialize)]
+struct Force {
+    #[serde(default)]
+    force: bool,
+}
+
 async fn delete_file(
     State(state): State<WebState>,
     Path(id): Path<i64>,
+    user: crate::db::User,
+    Query(q): Query<Force>,
 ) -> Result<StatusCode, ApiError> {
     let enc = state
         .ctx
         .db
         .enclosure(id)?
         .ok_or_else(|| anyhow::anyhow!("no enclosure {id}"))?;
+
+    // There is one copy of the file: deleting it deletes everyone's. Say so before doing
+    // it, once, and let them decide.
+    if !q.force {
+        let (starred, unread) = state.ctx.db.others_wanting(id, user.id)?;
+        let people = |n: i64| if n == 1 { "person".to_string() } else { format!("{n} people") };
+        let complaint = match (starred, unread) {
+            (0, 0) => None,
+            (0, u) => Some(format!("{} subscribed to this feed {} not played it yet", people(u), if u == 1 { "has" } else { "have" })),
+            (st, 0) => Some(format!("another {} starred it to keep", people(st))),
+            (st, u) => Some(format!(
+                "another {} starred it to keep, and {} not played it yet",
+                people(st),
+                if u == 1 { "one person has".to_string() } else { format!("{u} have") }
+            )),
+        };
+        if let Some(why) = complaint {
+            return Err(ApiError {
+                error: anyhow::Error::msg(format!("There is one copy of this file and {why}.")),
+                status: StatusCode::CONFLICT,
+            });
+        }
+    }
     if let Some(path) = &enc.path
         && let Err(e) = std::fs::remove_file(path)
         && e.kind() != std::io::ErrorKind::NotFound