1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
package formats
import (
"bytes"
"encoding/json"
"fmt"
"os"
"strings"
"text/tabwriter"
"text/template"
"github.com/ghodss/yaml"
"github.com/pkg/errors"
"golang.org/x/crypto/ssh/terminal"
)
const (
// JSONString const to save on duplicate variable names
JSONString = "json"
// IDString const to save on duplicates for Go templates
IDString = "{{.ID}}"
)
// Writer interface for outputs
type Writer interface {
Out() error
}
// JSONStructArray for JSON output
type JSONStructArray struct {
Output []interface{}
}
// StdoutTemplateArray for Go template output
type StdoutTemplateArray struct {
Output []interface{}
Template string
Fields map[string]string
}
// JSONStruct for JSON output
type JSONStruct struct {
Output interface{}
}
// StdoutTemplate for Go template output
type StdoutTemplate struct {
Output interface{}
Template string
Fields map[string]string
}
// YAMLStruct for YAML output
type YAMLStruct struct {
Output interface{}
}
// Out method for JSON Arrays
func (j JSONStructArray) Out() error {
data, err := json.MarshalIndent(j.Output, "", " ")
if err != nil {
return err
}
// JSON returns a byte array with a literal null [110 117 108 108] in it
// if it is passed empty data. We used bytes.Compare to see if that is
// the case.
if diff := bytes.Compare(data, []byte("null")); diff == 0 {
data = []byte("[]")
}
// If the we did get NULL back, we should spit out {} which is
// at least valid JSON for the consumer.
fmt.Printf("%s", data)
humanNewLine()
return nil
}
// Out method for Go templates
func (t StdoutTemplateArray) Out() error {
w := tabwriter.NewWriter(os.Stdout, 0, 0, 3, ' ', 0)
if strings.HasPrefix(t.Template, "table") {
// replace any spaces with tabs in template so that tabwriter can align it
t.Template = strings.Replace(strings.TrimSpace(t.Template[5:]), " ", "\t", -1)
headerTmpl, err := template.New("header").Funcs(headerFunctions).Parse(t.Template)
if err != nil {
return errors.Wrapf(err, "Template parsing error")
}
err = headerTmpl.Execute(w, t.Fields)
if err != nil {
return err
}
fmt.Fprintln(w, "")
}
t.Template = strings.Replace(t.Template, " ", "\t", -1)
tmpl, err := template.New("image").Funcs(basicFunctions).Parse(t.Template)
if err != nil {
return errors.Wrapf(err, "Template parsing error")
}
for i, img := range t.Output {
basicTmpl := tmpl.Funcs(basicFunctions)
err = basicTmpl.Execute(w, img)
if err != nil {
return err
}
if i != len(t.Output)-1 {
fmt.Fprintln(w, "")
continue
}
// Only print new line at the end of the output if stdout is the terminal
if terminal.IsTerminal(int(os.Stdout.Fd())) {
fmt.Fprintln(w, "")
}
}
return w.Flush()
}
// Out method for JSON struct
func (j JSONStruct) Out() error {
data, err := json.MarshalIndent(j.Output, "", " ")
if err != nil {
return err
}
fmt.Printf("%s", data)
humanNewLine()
return nil
}
//Out method for Go templates
func (t StdoutTemplate) Out() error {
tmpl, err := template.New("image").Parse(t.Template)
if err != nil {
return errors.Wrapf(err, "template parsing error")
}
err = tmpl.Execute(os.Stdout, t.Output)
if err != nil {
return err
}
humanNewLine()
return nil
}
// Out method for YAML
func (y YAMLStruct) Out() error {
var buf []byte
var err error
buf, err = yaml.Marshal(y.Output)
if err != nil {
return err
}
fmt.Printf("%s", string(buf))
humanNewLine()
return nil
}
// humanNewLine prints a new line at the end of the output only if stdout is the terminal
func humanNewLine() {
if terminal.IsTerminal(int(os.Stdout.Fd())) {
fmt.Println()
}
}
|
