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102 lines
2.2 KiB
102 lines
2.2 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 help flag (`-h/--help`) is defined as `cli.HelpFlag` and is checked
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by the cli internals in order to print generated help text for the app, command,
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or subcommand, and break execution.
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#### Customization
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All of the help text generation may be customized, and at multiple levels. The
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templates are exposed as variables `AppHelpTemplate`, `CommandHelpTemplate`, and
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`SubcommandHelpTemplate` which may be reassigned or augmented, and full override
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is possible by assigning a compatible func to the `cli.HelpPrinter` variable,
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e.g.:
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<!-- {
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"output": "Ha HA. I pwnd the help!!1"
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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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"io"
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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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// EXAMPLE: Append to an existing template
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cli.AppHelpTemplate = fmt.Sprintf(`%s
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WEBSITE: http://awesometown.example.com
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SUPPORT: support@awesometown.example.com
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`, cli.AppHelpTemplate)
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// EXAMPLE: Override a template
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cli.AppHelpTemplate = `NAME:
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{{.Name}} - {{.Usage}}
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USAGE:
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{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
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{{if len .Authors}}
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AUTHOR:
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{{range .Authors}}{{ . }}{{end}}
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{{end}}{{if .Commands}}
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COMMANDS:
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{{range .Commands}}{{if not .HideHelp}} {{join .Names ", "}}{{ "\t"}}{{.Usage}}{{ "\n" }}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
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GLOBAL OPTIONS:
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{{range .VisibleFlags}}{{.}}
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{{end}}{{end}}{{if .Copyright }}
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COPYRIGHT:
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{{.Copyright}}
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{{end}}{{if .Version}}
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VERSION:
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{{.Version}}
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{{end}}
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`
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// EXAMPLE: Replace the `HelpPrinter` func
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cli.HelpPrinter = func(w io.Writer, templ string, data interface{}) {
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fmt.Println("Ha HA. I pwnd the help!!1")
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}
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(&cli.App{}).Run(os.Args)
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}
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```
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The default flag may be customized to something other than `-h/--help` by
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setting `cli.HelpFlag`, e.g.:
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<!-- {
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"args": ["--halp"],
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"output": "haaaaalp.*HALP"
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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.HelpFlag = &cli.BoolFlag{
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Name: "haaaaalp",
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Aliases: []string{"halp"},
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Usage: "HALP",
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EnvVars: []string{"SHOW_HALP", "HALPPLZ"},
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}
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(&cli.App{}).Run(os.Args)
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}
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```
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