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
|
---
tags:
- v2
search:
boost: 2
---
The default version flag (`-v/--version`) is defined as `cli.VersionFlag`, which
is checked by the cli internals in order to print the `App.Version` via
`cli.VersionPrinter` and break execution.
#### Customization
The default flag may be customized to something other than `-v/--version` by
setting `cli.VersionFlag`, e.g.:
<!-- {
"args": ["--print-version"],
"output": "partay version v19\\.99\\.0"
} -->
```go
package main
import (
"os"
"github.com/urfave/cli/v2"
)
func main() {
cli.VersionFlag = &cli.BoolFlag{
Name: "print-version",
Aliases: []string{"V"},
Usage: "print only the version",
}
app := &cli.App{
Name: "partay",
Version: "v19.99.0",
}
app.Run(os.Args)
}
```
Alternatively, the version printer at `cli.VersionPrinter` may be overridden,
e.g.:
<!-- {
"args": ["--version"],
"output": "version=v19\\.99\\.0 revision=fafafaf"
} -->
```go
package main
import (
"fmt"
"os"
"github.com/urfave/cli/v2"
)
var (
Revision = "fafafaf"
)
func main() {
cli.VersionPrinter = func(cCtx *cli.Context) {
fmt.Printf("version=%s revision=%s\n", cCtx.App.Version, Revision)
}
app := &cli.App{
Name: "partay",
Version: "v19.99.0",
}
app.Run(os.Args)
}
```
|
