Use go_errors library everywhere.

gopher/errors.go

@@ -1,8 +1,6 @@
 package gopher
 
-import (
-	"gemini-grc/errors"
-)
+import "github.com/antanst/go_errors"
 
 // GopherError is an error encountered while
 // visiting a Gopher host, and is only for
@@ -28,5 +26,5 @@ func IsGopherError(err error) bool {
 		return false
 	}
 	var asError *GopherError
-	return errors.As(err, &asError)
+	return go_errors.As(err, &asError)
 }

gopher/network.go

@@ -15,8 +15,8 @@ import (
 	"gemini-grc/common/snapshot"
 	_url "gemini-grc/common/url"
 	"gemini-grc/config"
-	"gemini-grc/errors"
 	"gemini-grc/logging"
+	"github.com/antanst/go_errors"
 	"github.com/guregu/null/v5"
 )
 
@@ -118,7 +118,7 @@ func Visit(url string) (*snapshot.Snapshot, error) {
 func connectAndGetData(url string) ([]byte, error) {
 	parsedURL, err := stdurl.Parse(url)
 	if err != nil {
-		return nil, errors.NewError(err)
+		return nil, go_errors.NewError(err)
 	}
 
 	hostname := parsedURL.Hostname()
@@ -169,7 +169,7 @@ func connectAndGetData(url string) ([]byte, error) {
 			data = append(data, buf[:n]...)
 		}
 		if err != nil {
-			if errors.Is(err, io.EOF) {
+			if go_errors.Is(err, io.EOF) {
 				break
 			}
 			return nil, errors2.NewHostError(err)