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cmd_route.go
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/
cmd_route.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright 2023 The Prime Citizens
package cli
import (
"io"
"sort"
)
// Route contains the route leading from the root Cmd to the target Cmd.
type Route []*Cmd
// Root returns the first entry in the route.
//
// It returns nil if it is empty.
func (p Route) Root() *Cmd {
if len(p) != 0 {
return p[0]
}
return nil
}
// Push appends a cmd to the route.
func (p Route) Push(cmd *Cmd) Route {
return append(p, cmd)
}
// Target returns the last *Cmd in route.
//
// It returns nil if it is empty.
func (p Route) Target() *Cmd {
if len(p) == 0 {
return nil
}
return p[len(p)-1]
}
// Up returns a Route containing all but the last *Cmd.
//
// It returns nil if it is empty.
func (p Route) Up() Route {
if len(p) < 1 {
return nil
}
return p[:len(p)-1]
}
// CheckFlagValueChanged implements [Inspector].
func (p *Route) CheckFlagValueChanged(name string) bool {
flag, ok := p.FindFlag(name)
if !ok {
panic(&ErrFlagUndefined{Name: name})
}
return flag.State().ValueChanged()
}
// FindFlag implements [FlagFinder].
func (p *Route) FindFlag(name string) (f Flag, ok bool) {
route := *p
flags := p.Target().LocalFlags
if flags != nil {
f, ok = flags.FindFlag(name)
if ok {
return
}
}
for i := len(route) - 1; i >= 0; i-- {
flags = route[i].Flags
if flags != nil {
f, ok = flags.FindFlag(name)
if ok {
return
}
}
}
return nil, false
}
// NthFlag implements [FlagIter]
func (p *Route) NthFlag(i int) (info FlagInfo, ok bool) {
route := *p
c := route.Target()
if c == nil {
return
}
if c.LocalFlags != nil {
var iter FlagIter
iter, ok = c.LocalFlags.(FlagIter)
if ok {
info, ok = iter.NthFlag(i)
if ok {
return info, true
}
// - count of local flags
i -= sort.Search(i, func(i int) bool {
_, ok := iter.NthFlag(i)
return !ok
})
}
}
for j := len(route) - 1; j >= 0; j-- {
c = route[j]
if c.Flags == nil {
continue
}
var iter FlagIter
iter, ok = c.Flags.(FlagIter)
if ok {
info, ok = iter.NthFlag(i)
if ok {
return
}
// - count of flags
i -= sort.Search(i, func(i int) bool {
_, ok := iter.NthFlag(i)
return !ok
})
}
}
return FlagInfo{}, false
}
// FormatRoute writes all Cmd.Name() in the route with sep in between.
//
// For the last Cmd in route (the target), it writes the complete Cmd.Pattern.
func FormatRoute(w io.Writer, route Route, sep string) (n int, err error) {
if len(route) == 0 {
return
}
var x int
for i := 0; i < len(route)-1; i++ {
x, err = wstr(w, route[i].Name())
n += x
if err != nil {
return
}
x, err = wstr(w, sep)
n += x
if err != nil {
return
}
}
x, err = wstr(w, route.Target().Pattern)
n += x
if err != nil {
return
}
return
}