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cchat-mock/internal/session/commander.go
2020-10-14 13:24:53 -07:00

115 lines
2.5 KiB
Go

package session
import (
"fmt"
"strconv"
"strings"
"github.com/Pallinder/go-randomdata"
"github.com/diamondburned/cchat"
"github.com/diamondburned/cchat-mock/internal/internet"
"github.com/diamondburned/cchat/text"
"github.com/pkg/errors"
)
type Commander struct{}
func (c *Commander) Run(cmds []string) ([]byte, error) {
switch cmd := arg(cmds, 0); cmd {
case "ls":
return []byte("Commands: ls, random"), nil
case "random":
// callback used to generate stuff and stream into readcloser
var generator func() string
// number of times to generate the word
var times = 1
switch arg(cmds, 1) {
case "paragraph":
generator = randomdata.Paragraph
case "noun":
generator = randomdata.Noun
case "silly_name":
generator = randomdata.SillyName
default:
return nil, errors.New("Usage: random <paragraph|noun|silly_name> [repeat]")
}
if n := arg(cmds, 2); n != "" {
i, err := strconv.Atoi(n)
if err != nil {
return nil, errors.Wrap(err, "Failed to parse repeat number")
}
times = i
}
var err error
for i := 0; i < times; i++ {
// Yes, we're simulating this even in something as trivial as a
// command prompt.
if err = internet.SimulateAustralian(); err == nil {
return []byte(generator()), nil
}
}
return nil, err
default:
return nil, fmt.Errorf("Unknown command: %q", cmd)
}
}
func (s *Commander) AsCompleter() cchat.Completer { return s }
func (s *Commander) Complete(words []string, i int64) []cchat.CompletionEntry {
switch {
case strings.HasPrefix("ls", words[i]):
return newCompEntries("ls")
case strings.HasPrefix("random", words[i]):
return newCompEntries(
"random paragraph",
"random noun",
"random silly_name",
)
case lookbackCheck(words, i, "random", "paragraph"):
return newCompEntries("paragraph")
case lookbackCheck(words, i, "random", "noun"):
return newCompEntries("noun")
case lookbackCheck(words, i, "random", "silly_name"):
return newCompEntries("silly_name")
default:
return nil
}
}
// completion will only override `this'.
func lookbackCheck(words []string, i int64, prev, this string) bool {
return strings.HasPrefix(this, words[i]) && i > 0 && words[i-1] == prev
}
func newCompEntries(raws ...string) []cchat.CompletionEntry {
var entries = make([]cchat.CompletionEntry, len(raws))
for i, raw := range raws {
entries[i] = cchat.CompletionEntry{
Raw: raw,
Text: text.Plain(raw),
}
}
return entries
}
func arg(sl []string, i int) string {
if i >= len(sl) {
return ""
}
return sl[i]
}