Add legacy diff messages with inline and expanded viewing

crates/plugin-manager/src/lib.rs

@@ -47,6 +47,8 @@ pub fn valid_id(id: &str) -> Result<()> {
 }
 pub fn bundled_manifests() -> Vec<Manifest> {
     vec![
+        serde_json::from_str(include_str!("../../../src/bundled/diffs/manifest.json"))
+            .expect("bundled diffs manifest"),
         serde_json::from_str(include_str!(
             "../../../src/bundled/channel-templates/manifest.json"
         ))

docs/plugin-architecture.md

@@ -364,6 +364,23 @@ mounted page; see [sidebar ownership](channels.md#ownership).
 
 ## Conversation contributions
 
+`registerMessage({ id, title, matches, component })` contributes an optional whole
+message body. Components receive `{ message: ChannelMessage }`; the first active
+match wins, throwing matchers are skipped, and render failure/removal restores the
+host body. Registration uses the same owned contribution lifetime as inline/link
+renderers. The host retains author/time chrome, actions, attachments and session
+ownership. `MessageRenderer` is a host-matched author-preview type, not event
+admission or cross-version capability negotiation.
+
+The bundled **Diff viewer** (`buzz.diffs`) handles `ChannelMessage.diff` from legacy
+kind 40008. Shared history, live, thread and exact readers retain these messages
+independently of the plugin, preserving raw patches rather than interpreting them
+as Markdown images or links. The plugin supplies an inline preview and expanded
+Unified/Split dialog. Disabled/failed rendering, malformed/incomplete patches and
+patches over the display parsing budget retain escaped raw text. Metadata is
+untrusted presentation, not repository access authority. No sending, applying,
+repository fetching or sidebar panels are added.
+
 `registerLink({ id, title, matches, className?, component })` contributes optional
 presentation for links already recognized by messages. The host retains the anchor,
 destination, new-tab/modifier behavior and panel activation. Components receive

package.json

@@ -56,6 +56,7 @@
     "mdast-util-from-markdown": "2.0.3",
     "nostr-tools": "2.25.2",
     "react": "19.2.8",
+    "react-diff-view": "3.3.2",
     "react-dom": "19.2.8",
     "react-markdown": "10.1.0",
     "remark-breaks": "4.0.0",

scripts/design-system/check-icons.mjs

@@ -42,6 +42,7 @@ const nonIconDependencies = new Set([
   "nostr-tools",
   "postcss",
   "react",
+  "react-diff-view", // Patch tables/parser, not an icon library.
   "react-dom",
   "react-markdown",
   "remark-breaks",

src/app/shell/SearchResults.test.tsx

@@ -71,7 +71,7 @@ it("shows the real read failure, retains conversation choices, and retries to an
     const request = wire.next();
     expect(request.filters).toEqual([
       {
-        kinds: [40002, 9], // The real reader canonicalizes set order.
+        kinds: [40002, 40008, 9], // The real reader canonicalizes set order.
         search: "wes-cr",
         search_mode: "prefix",
         limit: 20,

src/app/shell/useSearchMessages.ts

@@ -51,7 +51,7 @@ export function useSearchMessages(session: RelaySession, query: string) {
         .read(
           [
             {
-              kinds: [9, 40002],
+              kinds: [9, 40002, 40008],
               search: query,
               search_mode: "prefix",
               limit: 20,
@@ -65,7 +65,7 @@ export function useSearchMessages(session: RelaySession, query: string) {
             const destinations = event.tags.filter(([name]) => name === "h");
             const channelId = destinations[0]?.[1];
             if (
-              ![9, 40002].includes(event.kind) ||
+              ![9, 40002, 40008].includes(event.kind) ||
               destinations.length !== 1 ||
               !channelId ||
               !session.channels.get?.(channelId)

src/bundled/channels/useHiddenDms.test.tsx

@@ -185,7 +185,7 @@ it("checks a hidden DM directly on return for messages missed while closed", asy
   });
   expect(restored.result.current.hiddenIds.has("dm")).toBe(false);
   expect(h.read).toHaveBeenCalledWith(
-    [{ kinds: [9, 40002], "#h": ["dm"], limit: 100 }],
+    [{ kinds: [9, 40002, 40008], "#h": ["dm"], limit: 100 }],
     expect.objectContaining({ priority: "background" }),
   );
 });

src/bundled/channels/useHiddenDms.ts

@@ -140,7 +140,8 @@ export function useHiddenDms(
       show(messages.map((message) => message.channelId)),
     );
     const stopOutgoing = session.outbox?.observeSend((event) => {
-      if (event.kind !== 9 && event.kind !== 40002) return;
+      if (event.kind !== 9 && event.kind !== 40002 && event.kind !== 40008)
+        return;
       const destinations = event.tags.filter(([name]) => name === "h");
       const id = destinations.length === 1 ? destinations[0]?.[1] : undefined;
       const hiddenAtSend = current.current.find((entry) => entry.id === id);
@@ -182,7 +183,7 @@ export function useHiddenDms(
             const events = await session.read(
               [
                 {
-                  kinds: [9, 40002],
+                  kinds: [9, 40002, 40008],
                   "#h": [id],
                   limit: entry.knownIds ? 50 : 100,
                 },