overlays: Patch zola serve fix for config.toml changes

overlays/default.nix

@@ -2,5 +2,6 @@
   imports = [
     ./alejandra.nix
     ./hyprland.nix
+    ./zola.nix
   ];
 }

overlays/zola.nix

@@ -0,0 +1,9 @@
+{
+  nixpkgs.overlays = [
+    (final: prev: {
+      zola = prev.zola.overrideAttrs (oldAttrs: {
+        patches = (oldAttrs.patches or [ ]) ++ [ ../patches/zola-serve-fix.patch ];
+      });
+    })
+  ];
+}

patches/zola-serve-fix.patch

@@ -0,0 +1,44 @@
+From d9d41a0d919d90008e4c0db31cc86786ca502aa1 Mon Sep 17 00:00:00 2001
+From: Andrew Langmeier <raymi306@gmail.com>
+Date: Sun, 13 Aug 2023 17:34:32 +0000
+Subject: [PATCH] Add fix for detecting changes on files by editors which
+ replace files on save, such as vi
+
+---
+ src/cmd/serve.rs | 23 +++++++++++++++++++++++
+ 1 file changed, 23 insertions(+)
+
+diff --git a/src/cmd/serve.rs b/src/cmd/serve.rs
+index 46e8d9345..35fd85f1f 100644
+--- a/src/cmd/serve.rs
++++ b/src/cmd/serve.rs
+@@ -653,6 +653,29 @@ pub fn serve(
+                         };
+                         messages::report_elapsed_time(start);
+                     }
++                    NoticeRemove(path) => {
++                        // Some editors, like those in the vi family, replace the file you're
++                        // working on with a copy, breaking the watcher.
++                        //
++                        // See https://github.com/notify-rs/notify/issues/247
++                        //
++                        // If we need to watch other single required files, should handle them
++                        // here. For now, just config.toml needs special handling
++                        match detect_change_kind(root_dir, &path, &config_path) {
++                            (ChangeKind::Config, _) => {
++                                console::info("-> Config changed. The browser needs to be refreshed to make the changes visible.");
++
++                                if let Some(s) = recreate_site() {
++                                    site = s;
++                                }
++                                let entry = config_path_rel.to_str().unwrap_or("config.toml");
++                                watcher
++                                    .watch(root_dir.join(entry), RecursiveMode::Recursive)
++                                    .with_context(|| format!("Can't watch `{}` for changes in folder `{}`. Does it exist, and do you have correct permissions?", entry, root_dir.display()))?;
++                            }
++                            _ => {}
++                        }
++                    }
+                     _ => {}
+                 }
+             }