errors: don't print an empty line for Exit with empty message#2312
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alliasgher wants to merge 2 commits intourfave:mainfrom
Open
errors: don't print an empty line for Exit with empty message#2312alliasgher wants to merge 2 commits intourfave:mainfrom
alliasgher wants to merge 2 commits intourfave:mainfrom
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When FlagStringer returns a string without a tab character, strings.Index returns -1 and out[-1:] panics with "slice bounds out of range [-1:]". Guard against this by clamping the index to 0 when no tab is found. In that case the entire FlagStringer output is used as the suffix portion of the formatted string, matching the intent of callers who use a custom stringer without the usual tab layout. Fixes urfave#2303 Signed-off-by: alliasgher <alliasgher123@gmail.com>
When HandleExitCoder received an ExitCoder whose Error() returned an
empty string (e.g. cli.Exit("", code)), it still called
fmt.Fprintln(ErrWriter, err) which wrote a bare newline to stderr.
Guard the print with a check on the error message so that an empty
message produces no output at all.
Fixes urfave#2263
Signed-off-by: alliasgher <alliasgher123@gmail.com>
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Summary
When
cli.Exit("", exitCode)is called,HandleExitCoderstill wrote a bare newline toErrWriter(usually stderr), because it calledfmt.Fprintln(ErrWriter, err)unconditionally. AnExitCoderwith an empty message should produce no output.Before
After
Fix
Guard the
fmt.Fprintln/fmt.Fprintfcalls with a check thaterr.Error() != ""before writing toErrWriter.Fixes #2263
Checklist
TestHandleExitCoder_EmptyMessage)