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writer.go
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writer.go
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// Copyright (C) 2017 Google Inc.
//
// 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 log
import (
"bytes"
"os"
)
// Writer is a function that writes out a formatted log message.
type Writer func(text string, severity Severity)
// Std returns a Writer that writes to stdout if the message severity is less
// than an error, otherwise it writes to stderr.
func Std() Writer {
return func(text string, severity Severity) {
out := os.Stdout
if severity >= Error {
out = os.Stderr
}
out.WriteString(text)
out.WriteString("\n")
}
}
// Stdout returns a Writer that writes to stdout for all severities.
func Stdout() Writer {
return func(text string, severity Severity) {
out := os.Stdout
out.WriteString(text)
out.WriteString("\n")
}
}
// Buffer returns a Writer that writes to the returned buffer.
func Buffer() (Writer, *bytes.Buffer) {
buf, nl := &bytes.Buffer{}, false
return func(text string, severity Severity) {
buf.WriteString(text)
if nl {
buf.WriteString("\n")
}
nl = true
}, buf
}