Add demo.sh check to prerelease hooks

Cargo.toml

@@ -61,6 +61,7 @@ inherits = "release"
 lto = "thin"
 
 [workspace.metadata.release]
+pre-release-hook = ["./demo.sh", "--check"]
 pre-release-replacements = [
   {file = "CHANGELOG.md", search = "## \\[Unreleased\\] - ReleaseDate", replace = "## [Unreleased] - ReleaseDate\n\n## [{{version}}] - {{date}}"},
 ]

RELEASE.md

@@ -3,6 +3,7 @@
 It's easy!
 
 - Make sure `CHANGELOG.md` has the latest release notes under `[Unreleased] - ReleaseDate`
+- Regenerate the demo gif with `./demo.sh` (and commit changes)
 - `cargo release <major|minor|patch>`
   - If it looks good, add `--execute`
 

demo.sh

@@ -2,5 +2,23 @@
 # Regenerate the demo GIF from the VHS tape
 # https://github.com/charmbracelet/vhs
 
-rm -rf data/ # Delete temp data so the GIF is consistent
-vhs static/demo.tape
+case $1 in
+    "--check")
+        latest_commit=$(git rev-parse HEAD)
+        latest_gif_commit=$(git log -n 1 --pretty=format:%H -- static/demo.gif)
+        if [ $latest_commit = $latest_gif_commit ]; then
+            echo "Good to go!"
+        else
+            echo "Demo gif is out of date"
+            echo "Run './demo.sh' to regenerate"
+            exit 1
+        fi
+        ;;
+    "")
+        rm -rf data/ # Delete temp data so the GIF is consistent
+        vhs static/demo.tape
+        ;;
+    *)
+        echo "Invalid args: $@"
+        exit 1
+esac