forked from coreos/fleet
/
help.go
119 lines (98 loc) · 2.29 KB
/
help.go
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package cli
import (
"fmt"
"os"
"text/tabwriter"
"text/template"
)
// The text template for the Default help topic.
// cli.go uses text/template to render templates. You can
// render custom help text by setting this variable.
var AppHelpTemplate = `NAME:
{{.Name}} - {{.Usage}}
USAGE:
{{.Name}} [global options] command [command options] [arguments...]
VERSION:
{{.Version}}
COMMANDS:
{{range .Commands}}{{.Name}}{{with .ShortName}}, {{.}}{{end}}{{ "\t" }}{{.Usage}}
{{end}}
GLOBAL OPTIONS:
{{range .Flags}}{{.}}
{{end}}
`
// The text template for the command help topic.
// cli.go uses text/template to render templates. You can
// render custom help text by setting this variable.
var CommandHelpTemplate = `NAME:
{{.Name}} - {{.Usage}}
USAGE:
command {{.Name}} [command options] [arguments...]
DESCRIPTION:
{{.Description}}
OPTIONS:
{{range .Flags}}{{.}}
{{end}}
`
var helpCommand = Command{
Name: "help",
ShortName: "h",
Usage: "Shows a list of commands or help for one command",
Action: func(c *Context) {
args := c.Args()
if args.Present() {
ShowCommandHelp(c, args.First())
} else {
ShowAppHelp(c)
}
},
}
// Prints help for the App
var HelpPrinter = printHelp
func ShowAppHelp(c *Context) {
HelpPrinter(AppHelpTemplate, c.App)
}
// Prints help for the given command
func ShowCommandHelp(c *Context, command string) {
for _, c := range c.App.Commands {
if c.HasName(command) {
printHelp(CommandHelpTemplate, c)
return
}
}
fmt.Printf("No help topic for '%v'\n", command)
}
// Prints the version number of the App
func ShowVersion(c *Context) {
fmt.Printf("%v version %v\n", c.App.Name, c.App.Version)
}
func printHelp(templ string, data interface{}) {
w := tabwriter.NewWriter(os.Stdout, 0, 8, 1, '\t', 0)
t := template.Must(template.New("help").Parse(templ))
err := t.Execute(w, data)
if err != nil {
panic(err)
}
w.Flush()
}
func checkVersion(c *Context) bool {
if c.GlobalBool("version") {
ShowVersion(c)
return true
}
return false
}
func checkHelp(c *Context) bool {
if c.GlobalBool("h") || c.GlobalBool("help") {
ShowAppHelp(c)
return true
}
return false
}
func checkCommandHelp(c *Context, name string) bool {
if c.Bool("h") || c.Bool("help") {
ShowCommandHelp(c, name)
return true
}
return false
}