/
formatter.go
87 lines (74 loc) · 1.93 KB
/
formatter.go
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// Copyright (c) 2019 Cisco and/or its affiliates.
//
// 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 commands
import (
"bytes"
"encoding/json"
"fmt"
"io"
"text/template"
"time"
"github.com/ghodss/yaml"
)
var tmplFuncs = template.FuncMap{
"json": jsonTmpl,
"yaml": yamlTmpl,
"epoch": epochTmpl,
"ago": agoTmpl,
}
func formatAsTemplate(w io.Writer, format string, data interface{}) error {
t := template.New("format")
t.Funcs(tmplFuncs)
if format == "json" {
format = "{{json .}}"
} else if format == "yaml" {
format = "{{yaml .}}"
}
if _, err := t.Parse(format); err != nil {
return fmt.Errorf("parsing format template failed: %v", err)
}
var b bytes.Buffer
if err := t.Execute(&b, data); err != nil {
return fmt.Errorf("executing format template failed: %v", err)
}
_, err := b.WriteTo(w)
return err
}
func yamlTmpl(data interface{}) string {
var b bytes.Buffer
encoder := json.NewEncoder(&b)
if err := encoder.Encode(data); err != nil {
panic(err)
}
bb, err := yaml.JSONToYAML(b.Bytes())
if err != nil {
panic(err)
}
return string(bb)
}
func jsonTmpl(data interface{}) string {
var b bytes.Buffer
encoder := json.NewEncoder(&b)
encoder.SetIndent("", " ")
if err := encoder.Encode(data); err != nil {
panic(err)
}
return b.String()
}
func epochTmpl(s int64) time.Time {
return time.Unix(s, 0)
}
func agoTmpl(t time.Time) time.Duration {
return time.Since(t).Round(time.Second)
}