From c90e9311e3730a993e73f55ae2a722657337a2e4 Mon Sep 17 00:00:00 2001
From: John Guo <john@johng.cn>
Date: Wed, 5 Jul 2023 09:49:25 +0800
Subject: [PATCH] fix issue #2734 (#2740)

---
 cmd/gf/internal/cmd/genservice/genservice.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cmd/gf/internal/cmd/genservice/genservice.go b/cmd/gf/internal/cmd/genservice/genservice.go
index 076b61be6..554c9fe7e 100644
--- a/cmd/gf/internal/cmd/genservice/genservice.go
+++ b/cmd/gf/internal/cmd/genservice/genservice.go
@@ -324,6 +324,10 @@ func (c CGenService) checkAndUpdateMain(srcFolder string) (err error) {
 		mainFilePath     = gfile.Join(gfile.Dir(gfile.Dir(gfile.Dir(logicFilePath))), "main.go")
 		mainFileContent  = gfile.GetContents(mainFilePath)
 	)
+	// No main content found.
+	if mainFileContent == "" {
+		return nil
+	}
 	if gstr.Contains(mainFileContent, importStr) {
 		return nil
 	}
@@ -331,6 +335,10 @@ func (c CGenService) checkAndUpdateMain(srcFolder string) (err error) {
 	if err != nil {
 		return err
 	}
+	// No match.
+	if len(match) < 2 {
+		return nil
+	}
 	lines := garray.NewStrArrayFrom(gstr.Split(match[1], "\n"))
 	for i, line := range lines.Slice() {
 		line = gstr.Trim(line)