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