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package command
import (
"flag"
"fmt"
"io"
)
// New initialises a root Node.
func New(output io.Writer, logf LogFunc, name string, early HandlerFunc) Command {
c := rootNode{newNode(output, logf, name, "")}
c.f = early
return c
}
// newNode initialises a subcommand tree and returns its address.
func newNode(output io.Writer, logf LogFunc, name, usage string) *node {
n := &node{
name: name, usage: usage,
out: output, logf: logf,
set: flag.NewFlagSet(name, flag.ContinueOnError),
}
n.set.SetOutput(output)
n.set.Usage = func() {
_ = n.writeHelp()
if len(n.suffix) > 0 {
_, _ = fmt.Fprintln(output, "flags:")
n.set.PrintDefaults()
_, _ = fmt.Fprintln(output)
}
}
return n
}
func (n *node) Command(name, usage string, f HandlerFunc) Node {
n.NewCommand(name, usage, f)
return n
}
func (n *node) NewCommand(name, usage string, f HandlerFunc) Flag[Node] {
if f == nil {
panic("invalid handler")
}
if name == "" || usage == "" {
panic("invalid subcommand")
}
s := newNode(n.out, n.logf, name, usage)
s.f = f
if !n.adopt(s) {
panic("attempted to initialise subcommand with non-unique name")
}
return s
}
func (n *node) New(name, usage string) Node {
if name == "" || usage == "" {
panic("invalid subcommand tree")
}
s := newNode(n.out, n.logf, name, usage)
if !n.adopt(s) {
panic("attempted to initialise subcommand tree with non-unique name")
}
return s
}
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