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// Copyright 2024 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package herrors contains common Hugo errors and error related utilities.
package herrors
import (
"errors"
"fmt"
"os"
"regexp"
"runtime"
"strings"
"time"
)
// ErrorSender is a, typically, non-blocking error handler.
type ErrorSender interface {
SendError(err error)
}
// Recover is a helper function that can be used to capture panics.
// Put this at the top of a method/function that crashes in a template:
//
// defer herrors.Recover()
func Recover(args ...any) {
if r := recover(); r != nil {
fmt.Println("ERR:", r)
buf := make([]byte, 64<<10)
buf = buf[:runtime.Stack(buf, false)]
args = append(args, "stacktrace from panic: \n"+string(buf), "\n")
fmt.Println(args...)
}
}
// IsTimeoutError returns true if the given error is or contains a TimeoutError.
func IsTimeoutError(err error) bool {
return errors.Is(err, &TimeoutError{})
}
type TimeoutError struct {
Duration time.Duration
}
func (e *TimeoutError) Error() string {
return fmt.Sprintf("timeout after %s", e.Duration)
}
func (e *TimeoutError) Is(target error) bool {
_, ok := target.(*TimeoutError)
return ok
}
// errMessage wraps an error with a message.
type errMessage struct {
msg string
err error
}
func (e *errMessage) Error() string {
return e.msg
}
func (e *errMessage) Unwrap() error {
return e.err
}
// IsFeatureNotAvailableError returns true if the given error is or contains a FeatureNotAvailableError.
func IsFeatureNotAvailableError(err error) bool {
return errors.Is(err, &FeatureNotAvailableError{})
}
// ErrFeatureNotAvailable denotes that a feature is unavailable.
//
// We will, at least to begin with, make some Hugo features (SCSS with libsass) optional,
// and this error is used to signal those situations.
var ErrFeatureNotAvailable = &FeatureNotAvailableError{Cause: errors.New("this feature is not available in your current Hugo version, see https://goo.gl/YMrWcn for more information")}
// FeatureNotAvailableError is an error type used to signal that a feature is not available.
type FeatureNotAvailableError struct {
Cause error
}
func (e *FeatureNotAvailableError) Unwrap() error {
return e.Cause
}
func (e *FeatureNotAvailableError) Error() string {
return e.Cause.Error()
}
func (e *FeatureNotAvailableError) Is(target error) bool {
_, ok := target.(*FeatureNotAvailableError)
return ok
}
// Must panics if err != nil.
func Must(err error) {
if err != nil {
panic(err)
}
}
// IsNotExist returns true if the error is a file not found error.
// Unlike os.IsNotExist, this also considers wrapped errors.
func IsNotExist(err error) bool {
if os.IsNotExist(err) {
return true
}
// os.IsNotExist does not consider wrapped errors.
if os.IsNotExist(errors.Unwrap(err)) {
return true
}
return false
}
// IsExist returns true if the error is a file exists error.
// Unlike os.IsExist, this also considers wrapped errors.
func IsExist(err error) bool {
if os.IsExist(err) {
return true
}
// os.IsExist does not consider wrapped errors.
if os.IsExist(errors.Unwrap(err)) {
return true
}
return false
}
var nilPointerErrRe = regexp.MustCompile(`at <(.*)>: error calling (.*?): runtime error: invalid memory address or nil pointer dereference`)
const deferredPrefix = "__hdeferred/"
var deferredStringToRemove = regexp.MustCompile(`executing "__hdeferred/.*?" `)
// ImproveRenderErr improves the error message for rendering errors.
func ImproveRenderErr(inErr error) (outErr error) {
outErr = inErr
msg := improveIfNilPointerMsg(inErr)
if msg != "" {
outErr = &errMessage{msg: msg, err: outErr}
}
if strings.Contains(inErr.Error(), deferredPrefix) {
msg := deferredStringToRemove.ReplaceAllString(inErr.Error(), "executing ")
outErr = &errMessage{msg: msg, err: outErr}
}
return
}
func improveIfNilPointerMsg(inErr error) string {
m := nilPointerErrRe.FindStringSubmatch(inErr.Error())
if len(m) == 0 {
return ""
}
call := m[1]
field := m[2]
parts := strings.Split(call, ".")
if len(parts) < 2 {
return ""
}
receiverName := parts[len(parts)-2]
receiver := strings.Join(parts[:len(parts)-1], ".")
s := fmt.Sprintf("– %s is nil; wrap it in if or with: {{ with %s }}{{ .%s }}{{ end }}", receiverName, receiver, field)
return nilPointerErrRe.ReplaceAllString(inErr.Error(), s)
}
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