feat: Support nginx escape chars

Author: soulteary

internal/formatter/beautifier.js

@@ -173,6 +173,16 @@ function add_empty_line_after_nginx_directives(lines) {
   return output.reverse();
 }
 
+function fixDollarVar(lines) {
+  const placeHolder = `[dollar]`;
+  return lines.map((line) => {
+    while (line.indexOf(placeHolder) !== -1) {
+      line = line.replace(placeHolder, "$");
+    }
+    return line;
+  });
+}
+
 var options = { INDENTATION: "\t" };
 
 function perform_indentation(lines) {
@@ -205,5 +215,6 @@ function FormatNginxConf(text, indentation = "  ") {
   lines = join_opening_bracket(lines);
   lines = perform_indentation(lines);
   lines = add_empty_line_after_nginx_directives(lines);
+  lines = fixDollarVar(lines);
   return fold_empty_brackets(lines);
 }

internal/updater/updater.go

@@ -4,9 +4,23 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"regexp"
 	"strings"
 )
 
+func EncodeEscapeChars(s string) string {
+	return strings.ReplaceAll(strings.ReplaceAll(strings.ReplaceAll(strings.ReplaceAll(s, `\t`, `{{\\}}t`), `\s`, `{{\\}}s`), `\r`, `{{\\}}r`), `\n`, `{{\\}}n`)
+}
+
+func DecodeEscapeChars(s string) string {
+	return strings.ReplaceAll(strings.ReplaceAll(strings.ReplaceAll(strings.ReplaceAll(s, `{{\}}t`, `\t`), `{{\}}s`, `\s`), `{{\}}r`, `\r`), `{{\}}n`, `\n`)
+}
+
+func FixVars(s string) string {
+	s = regexp.MustCompile(`(\$)(\{\S+?\})`).ReplaceAllString(s, "[dollar]$2")
+	return regexp.MustCompile(`(return\s+\d+\s+?)([\s\S]+?);`).ReplaceAllString(s, "$1\"$2\";")
+}
+
 func UpdateConfInDir(rootDir string, fn func(s string) (string, error)) error {
 	if rootDir == "" {
 		return fmt.Errorf("scandir is empty")
@@ -23,12 +37,12 @@ func UpdateConfInDir(rootDir string, fn func(s string) (string, error)) error {
 				return err
 			}
 
-			modifiedData, err := fn(string(data))
+			modifiedData, err := fn(FixVars(EncodeEscapeChars(string(data))))
 			if err != nil {
 				return err
 			}
 
-			err = os.WriteFile(path, []byte(modifiedData), info.Mode())
+			err = os.WriteFile(path, []byte(DecodeEscapeChars(modifiedData)), info.Mode())
 			if err != nil {
 				return err
 			}