forked from digitalocean/doctl
/
commands.go
130 lines (109 loc) · 2.64 KB
/
commands.go
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/*
Copyright 2016 The Doctl Authors All rights reserved.
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"
"strings"
"github.com/digitalocean/doctl"
)
// Displayable is a displable entity. These are used for printing results.
type Displayable interface {
Cols() []string
ColMap() map[string]string
KV() []map[string]interface{}
JSON(io.Writer) error
}
type displayer struct {
ns string
config doctl.Config
item Displayable
out io.Writer
}
func (d *displayer) Display() error {
output, err := doctl.DoitConfig.GetString(doctl.NSRoot, "output")
if err != nil {
return nil
}
if output == "" {
output = "text"
}
switch output {
case "json":
return d.item.JSON(d.out)
case "text":
cols, err := handleColumns(d.ns, d.config)
if err != nil {
return err
}
return displayText(d.item, d.out, cols)
default:
return fmt.Errorf("unknown output type")
}
}
func writeJSON(item interface{}, w io.Writer) error {
b, err := json.Marshal(item)
if err != nil {
return err
}
var out bytes.Buffer
err = json.Indent(&out, b, "", " ")
if err != nil {
return err
}
_, err = out.WriteTo(w)
return err
}
func displayText(item Displayable, out io.Writer, includeCols []string) error {
w := newTabWriter(out)
cols := item.Cols()
if len(includeCols) > 0 && includeCols[0] != "" {
cols = includeCols
}
if !hc.hideHeader {
headers := []string{}
for _, k := range cols {
col := item.ColMap()[k]
if col == "" {
return fmt.Errorf("unknown column %q", k)
}
headers = append(headers, col)
}
fmt.Fprintln(w, strings.Join(headers, "\t"))
}
for _, r := range item.KV() {
values := []interface{}{}
formats := []string{}
for _, col := range cols {
v := r[col]
values = append(values, v)
switch v.(type) {
case string:
formats = append(formats, "%s")
case int:
formats = append(formats, "%d")
case float64:
formats = append(formats, "%f")
case bool:
formats = append(formats, "%v")
default:
formats = append(formats, "%v")
}
}
format := strings.Join(formats, "\t")
fmt.Fprintf(w, format+"\n", values...)
}
return w.Flush()
}