/
program.go
182 lines (160 loc) · 4.47 KB
/
program.go
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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
package command
import (
"fmt"
"io"
"os"
"strings"
"github.com/onsi/ginkgo/v2/formatter"
"github.com/onsi/ginkgo/v2/types"
)
type Program struct {
Name string
Heading string
Commands []Command
DefaultCommand Command
DeprecatedCommands []DeprecatedCommand
//For testing - leave as nil in production
OutWriter io.Writer
ErrWriter io.Writer
Exiter func(code int)
}
type DeprecatedCommand struct {
Name string
Deprecation types.Deprecation
}
func (p Program) RunAndExit(osArgs []string) {
var command Command
deprecationTracker := types.NewDeprecationTracker()
if p.Exiter == nil {
p.Exiter = os.Exit
}
if p.OutWriter == nil {
p.OutWriter = formatter.ColorableStdOut
}
if p.ErrWriter == nil {
p.ErrWriter = formatter.ColorableStdErr
}
defer func() {
exitCode := 0
if r := recover(); r != nil {
details, ok := r.(AbortDetails)
if !ok {
panic(r)
}
if details.Error != nil {
fmt.Fprintln(p.ErrWriter, formatter.F("{{red}}{{bold}}%s %s{{/}} {{red}}failed{{/}}", p.Name, command.Name))
fmt.Fprintln(p.ErrWriter, formatter.Fi(1, details.Error.Error()))
}
if details.EmitUsage {
if details.Error != nil {
fmt.Fprintln(p.ErrWriter, "")
}
command.EmitUsage(p.ErrWriter)
}
exitCode = details.ExitCode
}
command.Flags.ValidateDeprecations(deprecationTracker)
if deprecationTracker.DidTrackDeprecations() {
fmt.Fprintln(p.ErrWriter, deprecationTracker.DeprecationsReport())
}
p.Exiter(exitCode)
return
}()
args, additionalArgs := []string{}, []string{}
foundDelimiter := false
for _, arg := range osArgs[1:] {
if !foundDelimiter {
if arg == "--" {
foundDelimiter = true
continue
}
}
if foundDelimiter {
additionalArgs = append(additionalArgs, arg)
} else {
args = append(args, arg)
}
}
command = p.DefaultCommand
if len(args) > 0 {
p.handleHelpRequestsAndExit(p.OutWriter, args)
if command.Name == args[0] {
args = args[1:]
} else {
for _, deprecatedCommand := range p.DeprecatedCommands {
if deprecatedCommand.Name == args[0] {
deprecationTracker.TrackDeprecation(deprecatedCommand.Deprecation)
return
}
}
for _, tryCommand := range p.Commands {
if tryCommand.Name == args[0] {
command, args = tryCommand, args[1:]
break
}
}
}
}
command.Run(args, additionalArgs)
}
func (p Program) handleHelpRequestsAndExit(writer io.Writer, args []string) {
if len(args) == 0 {
return
}
matchesHelpFlag := func(args ...string) bool {
for _, arg := range args {
if arg == "--help" || arg == "-help" || arg == "-h" || arg == "--h" {
return true
}
}
return false
}
if len(args) == 1 {
if args[0] == "help" || matchesHelpFlag(args[0]) {
p.EmitUsage(writer)
Abort(AbortDetails{})
}
} else {
var name string
if args[0] == "help" || matchesHelpFlag(args[0]) {
name = args[1]
} else if matchesHelpFlag(args[1:]...) {
name = args[0]
} else {
return
}
if p.DefaultCommand.Name == name || p.Name == name {
p.DefaultCommand.EmitUsage(writer)
Abort(AbortDetails{})
}
for _, command := range p.Commands {
if command.Name == name {
command.EmitUsage(writer)
Abort(AbortDetails{})
}
}
fmt.Fprintln(writer, formatter.F("{{red}}Unknown Command: {{bold}}%s{{/}}", name))
fmt.Fprintln(writer, "")
p.EmitUsage(writer)
Abort(AbortDetails{ExitCode: 1})
}
return
}
func (p Program) EmitUsage(writer io.Writer) {
fmt.Fprintln(writer, formatter.F(p.Heading))
fmt.Fprintln(writer, formatter.F("{{gray}}%s{{/}}", strings.Repeat("-", len(p.Heading))))
fmt.Fprintln(writer, formatter.F("For usage information for a command, run {{bold}}%s help COMMAND{{/}}.", p.Name))
fmt.Fprintln(writer, formatter.F("For usage information for the default command, run {{bold}}%s help %s{{/}} or {{bold}}%s help %s{{/}}.", p.Name, p.Name, p.Name, p.DefaultCommand.Name))
fmt.Fprintln(writer, "")
fmt.Fprintln(writer, formatter.F("The following commands are available:"))
fmt.Fprintln(writer, formatter.Fi(1, "{{bold}}%s{{/}} or %s {{bold}}%s{{/}} - {{gray}}%s{{/}}", p.Name, p.Name, p.DefaultCommand.Name, p.DefaultCommand.Usage))
if p.DefaultCommand.ShortDoc != "" {
fmt.Fprintln(writer, formatter.Fi(2, p.DefaultCommand.ShortDoc))
}
for _, command := range p.Commands {
fmt.Fprintln(writer, formatter.Fi(1, "{{bold}}%s{{/}} - {{gray}}%s{{/}}", command.Name, command.Usage))
if command.ShortDoc != "" {
fmt.Fprintln(writer, formatter.Fi(2, command.ShortDoc))
}
}
}