fix: format the generated i18n keys

cmd/geni18n/main.go

@@ -3,8 +3,10 @@ package main
 
 import (
 	"bufio"
+	"bytes"
 	"flag"
 	"fmt"
+	"go/format"
 	"io/fs"
 	"os"
 	"path/filepath"
@@ -54,14 +56,9 @@ func main() {
 	}
 	sort.Strings(list)
 
-	f, err := os.Create(*out)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Error creating output file: %v\n", err)
-		os.Exit(1)
-	}
-	defer f.Close()
-
-	w := bufio.NewWriter(f)
+	// Generate code to buffer
+	var buf bytes.Buffer
+	w := bufio.NewWriter(&buf)
 	fmt.Fprintf(w, "// Code generated by cmd/geni18n. DO NOT EDIT.\n")
 	fmt.Fprintf(w, "package %s\n\n", *pkg)
 	fmt.Fprintf(w, "type Key string\n\n")
@@ -72,16 +69,29 @@ func main() {
 	}
 	fmt.Fprintf(w, ")\n")
 	w.Flush()
+
+	// Format the generated code
+	formatted, err := format.Source(buf.Bytes())
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Warning: failed to format generated code: %v\n", err)
+		formatted = buf.Bytes()
+	}
+
+	// Write to output file
+	if err := os.WriteFile(*out, formatted, 0644); err != nil {
+		fmt.Fprintf(os.Stderr, "Error writing output file: %v\n", err)
+		os.Exit(1)
+	}
 }
 
-func collectKeys(node map[string]interface{}, prefix string, keys map[string]struct{}) {
+func collectKeys(node map[string]any, prefix string, keys map[string]struct{}) {
 	for k, v := range node {
 		fullKey := k
 		if prefix != "" {
 			fullKey = prefix + "." + k
 		}
 		switch val := v.(type) {
-		case map[string]interface{}:
+		case map[string]any:
 			collectKeys(val, fullKey, keys)
 		default:
 			keys[fullKey] = struct{}{}