feature: Add goctl completion (#1505)

* feature: Add `goctl completion`

* Update const

Co-authored-by: anqiansong <anqiansong@bytedance.com>

tools/goctl/util/pathx/file.go

@@ -15,9 +15,10 @@ import (
 
 // NL defines a new line
 const (
-	NL       = "\n"
-	goctlDir = ".goctl"
-	gitDir   = ".git"
+	NL              = "\n"
+	goctlDir        = ".goctl"
+	gitDir          = ".git"
+	autoCompleteDir = ".auto_complete"
 )
 
 var goctlHome string
@@ -93,6 +94,16 @@ func GetGitHome() (string, error) {
 	return filepath.Join(goctlH, gitDir), nil
 }
 
+// GetAutoCompleteHome returns the auto_complete home of goctl.
+func GetAutoCompleteHome() (string, error) {
+	goctlH, err := GetGoctlHome()
+	if err != nil {
+		return "", err
+	}
+
+	return filepath.Join(goctlH, autoCompleteDir), nil
+}
+
 // GetTemplateDir returns the category path value in GoctlHome where could get it by GetGoctlHome
 func GetTemplateDir(category string) (string, error) {
 	home, err := GetGoctlHome()