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compl_getopt.go
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/
compl_getopt.go
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package completion
import (
"strings"
"unicode/utf8"
"github.com/u-root/u-root/cmds/elvish/eval"
"github.com/u-root/u-root/cmds/elvish/eval/vals"
"github.com/u-root/u-root/cmds/elvish/getopt"
"github.com/u-root/u-root/cmds/elvish/parse"
"github.com/u-root/u-root/cmds/elvish/hashmap"
)
func complGetopt(fm *eval.Frame, elemsv, optsv, argsv interface{}) {
var (
elems []string
opts []*getopt.Option
args []eval.Callable
variadic bool
)
desc := make(map[*getopt.Option]string)
// Convert arguments.
err := vals.Iterate(elemsv, func(v interface{}) bool {
elem, ok := v.(string)
if !ok {
throwf("arg should be string, got %s", vals.Kind(v))
}
elems = append(elems, elem)
return true
})
maybeThrow(err)
err = vals.Iterate(optsv, func(v interface{}) bool {
m, ok := v.(hashmap.Map)
if !ok {
throwf("opt should be map, got %s", vals.Kind(v))
}
get := func(k string) (string, bool) {
v, ok := m.Index(k)
if !ok {
return "", false
}
if vs, ok := v.(string); ok {
return vs, true
}
throwf("%s should be string, got %s", k, vals.Kind(v))
panic("unreachable")
}
opt := &getopt.Option{}
if s, ok := get("short"); ok {
r, size := utf8.DecodeRuneInString(s)
if r == utf8.RuneError || size != len(s) {
throwf("short option should be exactly one rune, got %v", parse.Quote(s))
}
opt.Short = r
}
if s, ok := get("long"); ok {
opt.Long = s
}
if opt.Short == 0 && opt.Long == "" {
throwf("opt should have at least one of short and long forms")
}
if s, ok := get("desc"); ok {
desc[opt] = s
}
opts = append(opts, opt)
return true
})
maybeThrow(err)
err = vals.Iterate(argsv, func(v interface{}) bool {
sv, ok := v.(string)
if ok {
if sv == "..." {
variadic = true
return true
}
throwf("string except for ... not allowed as argument handler, got %s", parse.Quote(sv))
}
arg, ok := v.(eval.Callable)
if !ok {
throwf("argument handler should be fn, got %s", vals.Kind(v))
}
args = append(args, arg)
return true
})
maybeThrow(err)
// TODO Configurable config
g := getopt.Getopt{opts, getopt.GNUGetoptLong}
_, parsedArgs, ctx := g.Parse(elems)
out := fm.OutputChan()
putShortOpt := func(opt *getopt.Option) {
c := &complexCandidate{stem: "-" + string(opt.Short)}
if d, ok := desc[opt]; ok {
c.displaySuffix = " (" + d + ")"
}
out <- c
}
putLongOpt := func(opt *getopt.Option) {
c := &complexCandidate{stem: "--" + opt.Long}
if d, ok := desc[opt]; ok {
c.displaySuffix = " (" + d + ")"
}
out <- c
}
switch ctx.Type {
case getopt.NewOptionOrArgument, getopt.Argument:
// Find argument completer
var argCompl eval.Callable
if len(parsedArgs) < len(args) {
argCompl = args[len(parsedArgs)]
} else if variadic {
argCompl = args[len(args)-1]
}
if argCompl != nil {
rawCands := make(chan rawCandidate)
defer close(rawCands)
go func() {
for rc := range rawCands {
out <- rc
}
}()
err := callArgCompleter(argCompl, fm.Evaler, []string{ctx.Text}, rawCands)
maybeThrow(err)
}
// TODO Notify that there is no suitable argument completer
case getopt.NewOption:
for _, opt := range opts {
if opt.Short != 0 {
putShortOpt(opt)
}
if opt.Long != "" {
putLongOpt(opt)
}
}
case getopt.NewLongOption:
for _, opt := range opts {
if opt.Long != "" {
putLongOpt(opt)
}
}
case getopt.LongOption:
for _, opt := range opts {
if strings.HasPrefix(opt.Long, ctx.Text) {
putLongOpt(opt)
}
}
case getopt.ChainShortOption:
for _, opt := range opts {
if opt.Short != 0 {
// XXX loses chained options
putShortOpt(opt)
}
}
case getopt.OptionArgument:
}
}