feat: Add post-generation hooks support

src/lib/bufrnix-options.nix

@@ -53,6 +53,26 @@ with lib; {
       };
     };
 
+    # Post-generation hooks configuration
+    hooks = {
+      postGeneration = mkOption {
+        type = types.str;
+        default = "";
+        description = "Bash commands to run after all code generation completes";
+        example = ''
+          echo "All generation completed!"
+          find . -name "*.pb.go" -exec gofmt -w {} +
+          cd gen/go && go mod tidy
+        '';
+      };
+
+      onFailure = mkOption {
+        type = types.enum ["continue" "stop"];
+        default = "continue";
+        description = "What to do if any hook fails (continue or stop execution)";
+      };
+    };
+
     # protoc options
     protoc = {
       sourceDirectories = mkOption {

src/lib/mkBufrnix.nix

@@ -387,5 +387,22 @@ in
         generateProtocCommands}
 
       ${debug.log 1 "Multiple output path code generation completed successfully" cfg}
+
+      # Execute post-generation hooks if configured
+      ${optionalString (cfg.hooks.postGeneration != "") ''
+        ${debug.log 1 "Executing post-generation hooks..." cfg}
+
+        # Set environment variables for hooks
+        export BUFRNIX_ROOT="${cfg.root}"
+        export BUFRNIX_ENABLED_LANGUAGES="${concatStringsSep " " (filter (lang: cfg.languages.${lang}.enable) languageNames)}"
+        export BUFRNIX_DEBUG_ENABLE="${if cfg.debug.enable then "true" else "false"}"
+        export BUFRNIX_DEBUG_VERBOSITY="${toString cfg.debug.verbosity}"
+
+        # Execute post-generation hooks
+        echo "🚀 Running post-generation hooks..."
+        ${cfg.hooks.postGeneration}
+        echo "✅ Post-generation hooks completed successfully"
+        ${debug.log 1 "Post-generation hooks completed successfully" cfg}
+      ''}
     '';
   }