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