return error if no home direcotory found

cmd.go

@@ -110,7 +110,11 @@ func (c *Cmd) Execute(ctx context.Context, doc *Document) error {
 	copy(args, c.Args)
 	for i, arg := range args {
 		if strings.HasPrefix(arg, "~") {
-			args[i] = filepath.Join(homeDirectory(), arg[1:])
+			hd, err := homeDirectory()
+			if err != nil {
+				return c.newError(err)
+			}
+			args[i] = filepath.Join(hd, arg[1:])
 		}
 	}
 

home.go

@@ -1,23 +1,22 @@
 package hype
 
 import (
-	"log"
 	"os"
 )
 
 // homeDirectory retursn the home directory of the current user
 // it only runs once
 var homeDir string
 
-func homeDirectory() string {
+func homeDirectory() (string, error) {
 	if homeDir != "" {
-		return homeDir
+		return homeDir, nil
 	}
 
 	hd, err := os.UserHomeDir()
 	if err != nil {
-		log.Fatal(err)
+		return "", err
 	}
 	homeDir = hd
-	return homeDir
+	return homeDir, nil
 }