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// Copyright 2023 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 contains some basic logging setup.
package loggers
import (
"fmt"
"io"
"strings"
"sync"
"github.com/bep/logg"
"github.com/fatih/color"
)
var bold = color.New(color.Bold)
// levelColor mapping.
var levelColor = [...]*color.Color{
logg.LevelDebug: color.New(color.FgWhite),
logg.LevelInfo: color.New(color.FgBlue),
logg.LevelWarn: color.New(color.FgYellow),
logg.LevelError: color.New(color.FgRed),
}
// levelString mapping.
var levelString = [...]string{
logg.LevelDebug: "DEBUG",
logg.LevelInfo: "INFO ",
logg.LevelWarn: "WARN ",
logg.LevelError: "ERROR",
}
// newDefaultHandler handler.
func newDefaultHandler(outWriter, errWriter io.Writer) logg.Handler {
return &defaultHandler{
outWriter: outWriter,
errWriter: errWriter,
Padding: 0,
}
}
// Default Handler implementation.
// Based on https://github.com/apex/log/blob/master/handlers/cli/cli.go
type defaultHandler struct {
mu sync.Mutex
outWriter io.Writer // Defaults to os.Stdout.
errWriter io.Writer // Defaults to os.Stderr.
Padding int
}
// HandleLog implements logg.Handler.
func (h *defaultHandler) HandleLog(e *logg.Entry) error {
color := levelColor[e.Level]
level := levelString[e.Level]
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 + ": "
}
color.Fprintf(w, "%s %s%s", bold.Sprintf("%*s", h.Padding+1, level), color.Sprint(prefix), e.Message)
for _, field := range e.Fields {
if strings.HasPrefix(field.Name, reservedFieldNamePrefix) {
continue
}
fmt.Fprintf(w, " %s %v", color.Sprint(field.Name), field.Value)
}
fmt.Fprintln(w)
return nil
}
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