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renderer.go
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renderer.go
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// Copyright Red Hat, Inc., and individual contributors.
//
// 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 output
import (
"encoding/json"
"io"
"strings"
"github.com/pkg/errors"
)
type Renderer struct {
out io.Writer
}
func (r *Renderer) Render(cmd, outputType string, data interface{}) error {
if strings.ToLower(outputType) == "json" {
encoder := json.NewEncoder(r.out)
encoder.SetIndent("", " ")
return encoder.Encode(data)
}
if render, ok := renderers[cmd+outputType]; ok {
if err := render(r.out, data); err != nil {
return err
}
return nil
}
return errors.New("no renderer registed for " + cmd + outputType)
}
func (r *Renderer) AddRenderer(name, outType string, renderer func(out io.Writer, data interface{}) error) {
renderers[name+outType] = renderer
}
var renderers = map[string]func(out io.Writer, data interface{}) error{}
func NewRenderer(out io.Writer) *Renderer {
return &Renderer{out: out}
}
const (
FailedToOutPutInFormat = "failed to output %s in format %s"
)