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|
package opt
import (
"reflect"
"strings"
)
type Completion struct {
Value string
Description string
}
func (c *CmdSpec) unseenFlags(arg string) []Completion {
var flags []Completion
for i := 0; i < len(c.opts); i++ {
spec := &c.opts[i]
if !spec.appliesToAlias(c.name) || spec.seen {
continue
}
switch spec.kind {
case flag, option:
if spec.short != "" && strings.HasPrefix(spec.short, arg) {
flags = append(flags, Completion{
Value: spec.short + " ",
Description: spec.description,
})
}
if spec.long != "" && strings.HasPrefix(spec.long, arg) {
flags = append(flags, Completion{
Value: spec.long + " ",
Description: spec.description,
})
}
}
}
return flags
}
func (c *CmdSpec) nextPositional() *optSpec {
var spec *optSpec
for p := len(c.positionals) - 1; p >= 0; p-- {
spec = &c.opts[c.positionals[p]]
if !spec.appliesToAlias(c.name) {
continue
}
if spec.seenValue && (p+1) < len(c.positionals) {
// first "unseen" positional argument
return &c.opts[c.positionals[p+1]]
}
}
return spec
}
func (s *optSpec) getCompletions(arg string) []Completion {
if s.complete.IsValid() {
in := []reflect.Value{reflect.ValueOf(arg)}
out := s.complete.Call(in)
if res, ok := out[0].Interface().([]string); ok {
var completions []Completion
for _, value := range res {
completions = append(completions, Completion{
Value: value,
Description: s.description,
})
}
return completions
}
}
return nil
}
func (c *CmdSpec) GetCompletions(args *Args) ([]Completion, string) {
if args.Count() == 0 || (args.Count() == 1 && args.TrailingSpace() == "") {
return nil, ""
}
var completions []Completion
var prefix string
var flags []Completion
var last *seenArg
var spec *optSpec
_ = c.parseArgs(args.Clone())
if len(c.seen) > 0 {
last = c.seen[len(c.seen)-1]
}
if args.TrailingSpace() != "" {
// Complete new argument
prefix = args.String()
if last != nil && !last.spec.seenValue {
spec = last.spec
}
if spec == nil {
// Last argument was not a flag that required a value.
// Complete for the next unseen positional argument.
flags = c.unseenFlags("")
spec = c.nextPositional()
}
if spec != nil {
completions = spec.getCompletions("")
}
} else {
// Complete current argument
arg := args.Cut(1)[0]
prefix = args.String() + " "
if last != nil && last.indexes[len(last.indexes)-1] == args.Count() {
s := last.spec
f := s.long + "="
switch {
case (s.kind == flag || s.kind == option) && (s.short == arg || s.long == arg):
// Current argument is precisely a flag.
spec = nil
completions = []Completion{{Value: arg + " ", Description: s.description}}
case s.kind == option && f != "=" && strings.HasPrefix(arg, f):
// Current argument is a long flag in the format:
// --flag=value
// Strip the prefix and complete the value.
prefix += f
arg = strings.TrimPrefix(arg, f)
fallthrough
default:
spec = s
}
} else {
// Current argument was not identified, attempt
// completion from the next unseen positional.
spec = c.nextPositional()
}
if spec != nil {
completions = spec.getCompletions(arg)
}
if strings.HasPrefix(arg, "-") {
flags = c.unseenFlags(arg)
}
}
if flags != nil {
completions = append(completions, flags...)
}
return completions, prefix
}
|
