From 91dc11b3b80efc5fbd27ac511b62166083042545 Mon Sep 17 00:00:00 2001
From: Hidetatz Yaginuma <hidetatz@gmail.com>
Date: Mon, 31 Jul 2023 07:48:00 +0900
Subject: [PATCH] check stdmod existence by directly looking at the directory

---
 stdmod.go | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/stdmod.go b/stdmod.go
index 98f39e1..1d938f0 100644
--- a/stdmod.go
+++ b/stdmod.go
@@ -1,25 +1,25 @@
 package main
 
 import (
+	"errors"
 	"os"
 	"path/filepath"
 )
 
-var stdmods = []string{
-	"os",
-}
-
 func isstdmod(target string) bool {
-	for _, m := range stdmods {
-		if target == m {
-			return true
-		}
+	f := modtofile(filepath.Join(stdmoddir(), target))
+	if _, err := os.Stat(f); err == nil {
+		return true
+	} else if errors.Is(err, os.ErrNotExist) {
+		return false
+	} else {
+		// other error. todo: handle
 	}
 
 	return false
 }
 
 func stdmoddir() string {
-	home, _ := os.UserHomeDir()
+	home, _ := os.UserHomeDir() // todo: handle error
 	return filepath.Join(home, "shiba/std")
 }