geminicommit: rename mainProgram & add versionCheckHook

pkgs/by-name/ge/geminicommit/package.nix

@@ -4,6 +4,7 @@
   fetchFromGitHub,
   installShellFiles,
   stdenv,
+  versionCheckHook,
 }:
 
 buildGoModule (finalAttrs: {
@@ -26,9 +27,18 @@ buildGoModule (finalAttrs: {
   postInstall =
     let
       cmd = finalAttrs.meta.mainProgram;
+      goDefaultCmd = finalAttrs.pname;
     in
-    lib.optionalString (with stdenv; buildPlatform.canExecute hostPlatform) ''
-      # `geminicommit` requires write permissions to $HOME for its `config.toml`
+    # The official github released binary is renamed since v0.4.1,
+    # see: https://github.com/tfkhdyt/geminicommit/releases/tag/v0.4.1
+    # Here we link the old name (which is also the `go build` default name)
+    # for backward compatibility:
+    ''
+      mv $out/bin/${goDefaultCmd} $out/bin/${cmd}
+      ln -s $out/bin/${cmd} $out/bin/${goDefaultCmd}
+    ''
+    + lib.optionalString (with stdenv; buildPlatform.canExecute hostPlatform) ''
+      # `gmc` requires write permissions to $HOME for its `config.toml`
       # ... which is automatically initiated on startup
       export HOME=$(mktemp -d)
 
@@ -39,11 +49,17 @@ buildGoModule (finalAttrs: {
       done
     '';
 
+  nativeInstallCheckInputs = [
+    versionCheckHook
+  ];
+
+  doInstallCheck = true;
+
   meta = {
     description = "CLI that generates git commit messages with Google Gemini AI";
     homepage = "https://github.com/tfkhdyt/geminicommit";
     license = lib.licenses.gpl3Only;
     maintainers = with lib.maintainers; [ bryango ];
-    mainProgram = "geminicommit";
+    mainProgram = "gmc";
   };
 })