mirror of https://github.com/gohugoio/hugo.git
86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package herrors contains common Hugo errors and error related utilities.
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package herrors
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"os"
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"runtime"
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"runtime/debug"
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"strconv"
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_errors "github.com/pkg/errors"
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)
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// As defined in https://godoc.org/github.com/pkg/errors
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type causer interface {
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Cause() error
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}
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type stackTracer interface {
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StackTrace() _errors.StackTrace
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}
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// PrintStackTraceFromErr prints the error's stack trace to stdoud.
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func PrintStackTraceFromErr(err error) {
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FprintStackTraceFromErr(os.Stdout, err)
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}
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// FprintStackTraceFromErr prints the error's stack trace to w.
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func FprintStackTraceFromErr(w io.Writer, err error) {
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if err, ok := err.(stackTracer); ok {
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for _, f := range err.StackTrace() {
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fmt.Fprintf(w, "%+s:%d\n", f, f)
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}
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}
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}
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// PrintStackTrace prints the current stacktrace to w.
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func PrintStackTrace(w io.Writer) {
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buf := make([]byte, 1<<16)
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runtime.Stack(buf, true)
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fmt.Fprintf(w, "%s", buf)
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}
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// Recover is a helper function that can be used to capture panics.
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// Put this at the top of a method/function that crashes in a template:
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// defer herrors.Recover()
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func Recover(args ...interface{}) {
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if r := recover(); r != nil {
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fmt.Println("ERR:", r)
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args = append(args, "stacktrace from panic: \n"+string(debug.Stack()), "\n")
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fmt.Println(args...)
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}
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}
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// Get the current goroutine id. Used only for debugging.
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func GetGID() uint64 {
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b := make([]byte, 64)
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b = b[:runtime.Stack(b, false)]
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b = bytes.TrimPrefix(b, []byte("goroutine "))
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b = b[:bytes.IndexByte(b, ' ')]
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n, _ := strconv.ParseUint(string(b), 10, 64)
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return n
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}
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// ErrFeatureNotAvailable denotes that a feature is unavailable.
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//
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// We will, at least to begin with, make some Hugo features (SCSS with libsass) optional,
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// and this error is used to signal those situations.
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var ErrFeatureNotAvailable = errors.New("this feature is not available in your current Hugo version, see https://goo.gl/YMrWcn for more information")
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