Fix: Win10 symlink require privilege (#175)

* Fix: Win10 symlink require privilege
* Refactor: Move func to specific OS
Fix: Wrong Unix
Fix: Wrong Unix

gobrew.go

@@ -266,11 +266,10 @@ func (gb *GoBrew) ListRemoteVersions(print bool) map[string][]string {
 
 // CurrentVersion get current version from symb link
 func (gb *GoBrew) CurrentVersion() string {
-	fp, err := filepath.EvalSymlinks(gb.currentBinDir)
+	fp, err := evalSymlinks(gb.currentBinDir)
 	if err != nil {
 		return "None"
 	}
-
 	version := strings.TrimSuffix(fp, filepath.Join("go", "bin"))
 	version = filepath.Base(version)
 	if version == "." {

gobrew_unix.go

@@ -4,6 +4,7 @@ package gobrew
 
 import (
 	"os"
+	"path/filepath"
 
 	"github.com/kevincobain2000/gobrew/utils"
 )
@@ -16,3 +17,15 @@ const (
 func removeFile(goBrewFile string) {
 	utils.CheckError(os.Remove(goBrewFile), "==> [Error] Cannot remove binary file")
 }
+
+func symlink(oldname string, newname string) {
+	utils.CheckError(os.Symlink(oldname, newname), "==> [Error]: symbolic link failed")
+}
+
+func evalSymlinks(path string) (string, error) {
+	fp, err := filepath.EvalSymlinks(path)
+	if err != nil {
+		return "", err
+	}
+	return fp, nil
+}

gobrew_windows.go

@@ -1,7 +1,10 @@
 package gobrew
 
 import (
+	"fmt"
 	"os"
+	"os/exec"
+	"strings"
 
 	"github.com/kevincobain2000/gobrew/utils"
 )
@@ -15,3 +18,23 @@ func removeFile(goBrewFile string) {
 	goBrewOldFile := goBrewFile + ".old"
 	utils.CheckError(os.Rename(goBrewFile, goBrewOldFile), "==> [Error] Cannot rename binary file")
 }
+
+func symlink(oldname string, newname string) {
+	utils.CheckError(
+		exec.Command("cmd", "/c", "mklink", "/J", newname, oldname).Run(),
+		"==> [Error]: symbolic link failed",
+	)
+}
+
+// https://github.com/golang/go/issues/63703
+func evalSymlinks(path string) (string, error) {
+	cmd := fmt.Sprintf(
+		"Get-Item -Path %s | Select-Object -ExpandProperty Target",
+		path,
+	)
+	output, err := exec.Command("powershell", "/c", cmd).CombinedOutput()
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(output)), err
+}

helpers.go

@@ -349,13 +349,13 @@ func (gb *GoBrew) downloadAndExtract(version string) {
 func (gb *GoBrew) changeSymblinkGoBin(version string) {
 	goBinDst := filepath.Join(gb.versionsDir, version, "/go/bin")
 	_ = os.RemoveAll(gb.currentBinDir)
-	utils.CheckError(os.Symlink(goBinDst, gb.currentBinDir), "==> [Error]: symbolic link failed")
+	symlink(goBinDst, gb.currentBinDir)
 }
 
 func (gb *GoBrew) changeSymblinkGo(version string) {
 	_ = os.RemoveAll(gb.currentGoDir)
 	versionGoDir := filepath.Join(gb.versionsDir, version, "go")
-	utils.CheckError(os.Symlink(versionGoDir, gb.currentGoDir), "==> [Error]: symbolic link failed")
+	symlink(versionGoDir, gb.currentGoDir)
 }
 
 func (gb *GoBrew) getGobrewVersion() string {