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arikawa/bot/error.go

87 lines
1.7 KiB
Go

package bot
import (
"errors"
"fmt"
"strings"
)
type ErrUnknownCommand struct {
Parts []string // max len 2
Subcmd *Subcommand
}
func newErrUnknownCommand(s *Subcommand, parts []string) error {
if len(parts) > 2 {
parts = parts[:2]
}
return &ErrUnknownCommand{
Parts: parts,
Subcmd: s,
}
}
func (err *ErrUnknownCommand) Error() string {
return UnknownCommandString(err)
}
var UnknownCommandString = func(err *ErrUnknownCommand) string {
// Subcommand check.
if err.Subcmd.StructName == "" || len(err.Parts) < 2 {
return "unknown command: " + err.Parts[0] + "."
}
return fmt.Sprintf("unknown %s subcommand: %s.", err.Parts[0], err.Parts[1])
}
var (
ErrTooManyArgs = errors.New("too many arguments given")
ErrNotEnoughArgs = errors.New("not enough arguments given")
)
type ErrInvalidUsage struct {
Prefix string
Args []string
Index int
Wrap error
// TODO: usage generator?
// Here, as a reminder
Ctx *MethodContext
}
func (err *ErrInvalidUsage) Error() string {
return InvalidUsageString(err)
}
func (err *ErrInvalidUsage) Unwrap() error {
return err.Wrap
}
var InvalidUsageString = func(err *ErrInvalidUsage) string {
if err.Index == 0 && err.Wrap != nil {
return "invalid usage, error: " + err.Wrap.Error() + "."
}
if err.Index == 0 || len(err.Args) == 0 {
return "missing arguments. Refer to help."
}
body := "Invalid usage at " +
// Write the prefix.
err.Prefix +
// Write the first part
strings.Join(err.Args[:err.Index], " ") +
// Write the wrong part
" __" + err.Args[err.Index] + "__ " +
// Write the last part
strings.Join(err.Args[err.Index+1:], " ")
if err.Wrap != nil {
body += "\nError: " + err.Wrap.Error() + "."
}
return body
}