fix: fix ExecCommand bug in windows

system/os.go

@@ -9,6 +9,10 @@ import (
 	"os"
 	"os/exec"
 	"runtime"
+	"unicode/utf8"
+
+	"github.com/duke-git/lancet/v2/validator"
+	"golang.org/x/text/encoding/simplifiedchinese"
 )
 
 // IsWindows check if current os is windows
@@ -50,27 +54,61 @@ func CompareOsEnv(key, comparedEnv string) bool {
 	return env == comparedEnv
 }
 
-// ExecCommand use shell /bin/bash -c to execute command
+// ExecCommand execute command, return the stdout and stderr string of command, and error if error occur
+// param `command` is a complete command strinig, like, ls -a (linux), dir(windows), ping 127.0.0.1
+// for linux,  use /bin/bash -c to execute command
+// for windows, use powershell.exe to execute command
 func ExecCommand(command string) (stdout, stderr string, err error) {
 	var out bytes.Buffer
-	var errout bytes.Buffer
+	var errOut bytes.Buffer
 
 	cmd := exec.Command("/bin/bash", "-c", command)
 	if IsWindows() {
-		cmd = exec.Command("cmd")
+		cmd = exec.Command("powershell.exe", command)
 	}
 	cmd.Stdout = &out
-	cmd.Stderr = &errout
+	cmd.Stderr = &errOut
+
 	err = cmd.Run()
 
 	if err != nil {
-		stderr = string(errout.Bytes())
+		if utf8.Valid(errOut.Bytes()) {
+			stderr = byteToString(errOut.Bytes(), "UTF8")
+		} else if validator.IsGBK(errOut.Bytes()) {
+			stderr = byteToString(errOut.Bytes(), "GBK")
+		}
+		return
+	}
+
+	data := out.Bytes()
+	if utf8.Valid(data) {
+		stdout = byteToString(data, "UTF8")
+	} else if validator.IsGBK(data) {
+		stdout = byteToString(data, "GBK")
 	}
-	stdout = string(out.Bytes())
 
 	return
 }
 
+func byteToString(data []byte, charset string) string {
+	var result string
+
+	switch charset {
+	case "GBK":
+		decodeBytes, _ := simplifiedchinese.GBK.NewDecoder().Bytes(data)
+		result = string(decodeBytes)
+	case "GB18030":
+		decodeBytes, _ := simplifiedchinese.GB18030.NewDecoder().Bytes(data)
+		result = string(decodeBytes)
+	case "UTF8":
+		fallthrough
+	default:
+		result = string(data)
+	}
+
+	return result
+}
+
 // GetOsBits get this system bits 32bit or 64bit
 // return bit int (32/64)
 func GetOsBits() int {