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package ffmd
import (
"fmt"
"sort"
"strings"
"github.com/peterbourgon/ff/v3/ffcli"
)
// Tree returns a tree-representation of a ffcli.Command
func Tree(cmd *ffcli.Command) string {
t := tree{cmd.Name: commandTree(cmd)}
s := t.String(true, "")
return strings.TrimSpace(s)
}
type tree map[string]tree
func commandTree(cmd *ffcli.Command) tree {
t := tree{}
for _, sub := range cmd.Subcommands {
t[sub.Name] = commandTree(sub)
}
return t
}
func (t tree) keys() []string {
k := make([]string, 0, len(t))
for key, _ := range t {
k = append(k, key)
}
sort.Strings(k)
return k
}
func (t tree) String(root bool, padding string) string {
var s strings.Builder
index := 0
for _, k := range t.keys() {
v := t[k]
p := pipe(index, len(t))
s.WriteString(fmt.Sprintf("%s%s\n", padding+pipePad(root, p), k))
op := outerPipe(index, len(t))
s.WriteString(v.String(false, padding+pipePad(root, op)))
index++
}
return s.String()
}
func pipe(index int, len int) string {
switch {
case index+1 > len:
return " "
case index+1 == len:
return "└─"
default:
return "├─"
}
}
func outerPipe(index int, len int) string {
switch {
case index+1 == len:
return " "
default:
return "│ "
}
}
func pipePad(root bool, box string) string {
if root {
return ""
}
return box + " "
}