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// Copyright 2024 The Hugo Authors. All rights reserved.
// Some functions in this file (see comments) is based on the Go source code,
// copyright The Go Authors and governed by a BSD-style license.
//
// 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 loggers
import (
"fmt"
"io"
"regexp"
"strings"
"sync"
"github.com/bep/logg"
)
// newNoAnsiEscapeHandler creates a new noAnsiEscapeHandler
func newNoAnsiEscapeHandler(outWriter, errWriter io.Writer, noLevelPrefix bool, predicate func(*logg.Entry) bool) *noAnsiEscapeHandler {
if predicate == nil {
predicate = func(e *logg.Entry) bool { return true }
}
return &noAnsiEscapeHandler{
noLevelPrefix: noLevelPrefix,
outWriter: outWriter,
errWriter: errWriter,
predicate: predicate,
}
}
type noAnsiEscapeHandler struct {
mu sync.Mutex
outWriter io.Writer // Defaults to os.Stdout.
errWriter io.Writer // Defaults to os.Stderr.
predicate func(*logg.Entry) bool
noLevelPrefix bool
}
func (h *noAnsiEscapeHandler) HandleLog(e *logg.Entry) error {
if !h.predicate(e) {
return nil
}
h.mu.Lock()
defer h.mu.Unlock()
var w io.Writer
if e.Level > logg.LevelInfo {
w = h.errWriter
} else {
w = h.outWriter
}
var prefix string
for _, field := range e.Fields {
if field.Name == FieldNameCmd {
prefix = fmt.Sprint(field.Value)
break
}
}
if prefix != "" {
prefix = prefix + ": "
}
msg := stripANSI(e.Message)
if h.noLevelPrefix {
fmt.Fprintf(w, "%s%s", prefix, msg)
} else {
fmt.Fprintf(w, "%s %s%s", levelString[e.Level], prefix, msg)
}
for _, field := range e.Fields {
if strings.HasPrefix(field.Name, reservedFieldNamePrefix) {
continue
}
fmt.Fprintf(w, " %s %v", field.Name, field.Value)
}
fmt.Fprintln(w)
return nil
}
var ansiRe = regexp.MustCompile(`\x1b\[[0-9;]*m`)
// stripANSI removes ANSI escape codes from s.
func stripANSI(s string) string {
return ansiRe.ReplaceAllString(s, "")
}
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