Link the Mac app and release flow to the project page

AppleNugs/macOS/AppleNugsApp.swift

@@ -128,6 +128,13 @@ struct AppleNugsApp: App {
             CommandGroup(before: .windowArrangement) {
                 NowPlayingWindowMenuItem()
             }
+            // The default Help item only says "Help isn't available"; point it
+            // at the project page instead.
+            CommandGroup(replacing: .help) {
+                Button("AppleNugs Website") {
+                    NSWorkspace.shared.open(URL(string: "https://timvanbenschoten.com/code/applenugs")!)
+                }
+            }
         }
 
         Window("Now Playing", id: NowPlayingWindow.id) {

AppleNugs/macOS/Credits.rtf

@@ -0,0 +1,6 @@
+{\rtf1\ansi\ansicpg1252\cocoartf2822
+{\fonttbl\f0\fnil\fcharset0 .AppleSystemUIFont;}
+\pard\qc
+
+\f0\fs22 Made by Tim VanBenschoten\
+{\field{\*\fldinst{HYPERLINK "https://timvanbenschoten.com/code/applenugs"}}{\fldrslt timvanbenschoten.com/code/applenugs}}}

DISTRIBUTION.md

@@ -199,6 +199,18 @@ AppleNugs uses [Sparkle](https://sparkle-project.org) for in-app updates. The
    The feed must never point at a 404 — uploading the asset before pushing
    `appcast.xml` guarantees that.
 
+   End the GitHub Release notes with the project page line:
+
+   ```
+   Project page: https://timvanbenschoten.com/code/applenugs
+   ```
+
+   The script passes `--link` with the same URL, so each new appcast item
+   carries it too. To show notes in Sparkle's update window, put an
+   `AppleNugs-X.Y.html` file (an HTML fragment, no `<body>`) next to the DMG in
+   `build/sparkle-enclosure/` and end it with
+   `<p>Project page: <a href="https://timvanbenschoten.com/code/applenugs">timvanbenschoten.com/code/applenugs</a></p>`.
+
 5. **Wait for the feed to resolve.** `appcast.xml` is served from
    `raw.githubusercontent.com`, which only resolves once the repo is **public**.
    GitHub's CDN caches raw content for approximately 5 minutes after a push, so

scripts/sparkle-appcast.sh

@@ -14,8 +14,12 @@ TOOLS="${SPARKLE_TOOLS:-build/sparkle-tools/bin}"
 
 [ -x "$TOOLS/generate_appcast" ] || { echo "generate_appcast not found at $TOOLS (see Task 1)"; exit 1; }
 
+# --link adds a <link> to the new item: the project page, which Sparkle offers
+# when it cannot install an update itself. A release-notes file named like the
+# DMG (AppleNugs-X.Y.html) in the enclosure dir is embedded as the description.
 "$TOOLS/generate_appcast" \
   --download-url-prefix "https://github.com/tsvb/applenugs/releases/download/${TAG}/" \
+  --link "https://timvanbenschoten.com/code/applenugs" \
   "$ENCLOSURE_DIR"
 
 cp "$ENCLOSURE_DIR/appcast.xml" appcast.xml