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app.go
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app.go
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package cli
import (
"fmt"
"os"
"strings"
)
// App type.
type App struct {
Name string
Version string
TryDefault bool
Groups []*Group
}
// Execute function.
func (a *App) Execute() {
if len(os.Args) > 1 {
for _, group := range a.Groups {
if os.Args[1] == group.Name {
if len(os.Args) > 2 {
for _, command := range group.Commands {
if os.Args[2] == command.Name {
os.Exit(command.HandleFunc(group, command, os.Args[3:]))
}
}
}
os.Exit(group.PrintHelp())
}
}
if a.TryDefault && len(a.Groups) > 0 && len(a.Groups[0].Commands) > 0 {
group := a.Groups[0]
command := group.Commands[0]
os.Exit(command.HandleFunc(group, command, os.Args[1:]))
}
}
os.Exit(a.PrintHelp())
}
// PrintHelp function.
func (a *App) PrintHelp() int {
fmt.Println(Green(a.Name) + " version " + Yellow(a.Version))
fmt.Println()
fmt.Println(Yellow("Usage:"))
fmt.Println(" group command [flags] [arguments]")
fmt.Println()
fmt.Println(Yellow("Available groups:"))
max := 0
for _, group := range a.Groups {
if max < len(group.Name) {
max = len(group.Name)
}
}
max += 2
for _, group := range a.Groups {
fmt.Println(" " + Green(group.Name) + strings.Repeat(" ", max-len(group.Name)) + group.Usage)
}
return Success
}