generating "," instead of keeping it in repository

main.go

@@ -1,10 +1,29 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"os"
 )
 
+var commaSh = `#!/bin/sh
+
+script_path=$(realpath $0)
+script_dir=$(dirname $script_path)
+
+cd $script_dir
+
+output=/tmp/commandgo
+
+# why not just using "go run ." ?
+# Because "go run ." will inject GOBIN into PATH while compiling,
+# and modifed PATH will pass into actual program.
+# So the program doesn't have the same PATH as outside.
+# It's not a acceptable behavior.
+
+go build -o $output . && $output $@
+`
+
 func commandsUsage() string {
 	return fmt.Sprintf(
 		`commands:
@@ -13,6 +32,18 @@ func commandsUsage() string {
 }
 
 func main() {
+	pwd, err := os.Getwd()
+	if err != nil {
+		panic(fmt.Errorf("detect current directory failed! %w", err))
+	}
+	target := pwd + string(os.PathSeparator) + ","
+	_, err = os.Stat(target)
+	if errors.Is(err, os.ErrNotExist) {
+		err := os.WriteFile(target, []byte(commaSh), 0755)
+		if err != nil {
+			panic(fmt.Errorf("write sh failed: %w", err))
+		}
+	}
 	if len(os.Args) >= 2 {
 		switch os.Args[1] {
 		case "path":