go-arg/subcommand.go

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package arg
// Subcommand returns the user struct for the subcommand selected by
// the command line arguments most recently processed by the parser.
// The return value is always a pointer to a struct. If no subcommand
// was specified then it returns the top-level arguments struct. If
// no command line arguments have been processed by this parser then it
// returns nil.
func (p *Parser) Subcommand() interface{} {
if p.lastCmd == nil || p.lastCmd.parent == nil {
return nil
}
return p.val(p.lastCmd.dest).Interface()
}
// SubcommandNames returns the sequence of subcommands specified by the
// user. If no subcommands were given then it returns an empty slice.
func (p *Parser) SubcommandNames() []string {
if p.lastCmd == nil {
return nil
}
// make a list of ancestor commands
var ancestors []string
cur := p.lastCmd
for cur.parent != nil { // we want to exclude the root
ancestors = append(ancestors, cur.name)
cur = cur.parent
}
// reverse the list
out := make([]string, len(ancestors))
for i := 0; i < len(ancestors); i++ {
out[i] = ancestors[len(ancestors)-i-1]
}
return out
}