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Check for parsing errors within parse.go:parseIter

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Add description to that function's docstring, and delete extraneous space
This commit is contained in:
Roberto Hidalgo 2019-11-27 11:42:48 -05:00
parent 90a62d7b0c
commit f3295e3cdb
No known key found for this signature in database
GPG Key ID: C4592BEB46817CC4
3 changed files with 12 additions and 8 deletions
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4
app.go
View File

@ -223,7 +223,7 @@ func (a *App) Run(arguments []string) (err error) {
return err
}
err = parseIter(set, a, arguments[1:])
err = parseIter(set, a, arguments[1:], shellComplete)
nerr := normalizeFlags(a.Flags, set)
context := NewContext(a, set, nil)
if nerr != nil {
@ -349,7 +349,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
return err
}
err = parseIter(set, a, ctx.Args().Tail())
err = parseIter(set, a, ctx.Args().Tail(), ctx.shellComplete)
nerr := normalizeFlags(a.Flags, set)
context := NewContext(a, set, ctx)

5
command.go
View File

@ -184,9 +184,8 @@ func (c *Command) parseFlags(args Args, shellComplete bool) (*flag.FlagSet, erro
return set, set.Parse(append([]string{"--"}, args.Tail()...))
}
err = parseIter(set, c, args.Tail())
// Continue parsing flags on failure during shell completion
if err != nil && !shellComplete {
err = parseIter(set, c, args.Tail(), shellComplete)
if err != nil {
return nil, err
}

11
parse.go
View File

@ -11,19 +11,24 @@ type iterativeParser interface {
}
// To enable short-option handling (e.g., "-it" vs "-i -t") we have to
// iteratively catch parsing errors. This way we achieve LR parsing without
// iteratively catch parsing errors. This way we achieve LR parsing without
// transforming any arguments. Otherwise, there is no way we can discriminate
// combined short options from common arguments that should be left untouched.
func parseIter(set *flag.FlagSet, ip iterativeParser, args []string) error {
// Pass `ignoreErrors` to continue parsing options on failure, for example
// during shell completion when the user-supplied options may be incomplete.
func parseIter(set *flag.FlagSet, ip iterativeParser, args []string, ignoreErrors bool) error {
for {
err := set.Parse(args)
if !ip.useShortOptionHandling() || err == nil {
if ignoreErrors {
return nil
}
return err
}
errStr := err.Error()
trimmed := strings.TrimPrefix(errStr, "flag provided but not defined: -")
if errStr == trimmed {
if !ignoreErrors && errStr == trimmed {
return err
}