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Subject: bug#44959: date error message should say -I
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$ date -I=3Dseconds
date: invalid argument =E2=80=98=3Dseconds=E2=80=99 for =E2=80=98--iso-86=
01=E2=80=99

Hey, that is a valid argument for --iso-8601. (But not for -I, so say
that instead.)

Here is a real invalid argument:

$ date --iso-8601=3Dsecondsz
date: invalid argument =E2=80=98secondsz=E2=80=99 for =E2=80=98--iso-8601=
=E2=80=99

date (GNU coreutils) 8.32

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To: =?UTF-8?Q?=E7=A9=8D=E4=B8=B9=E5=B0=BC?= Dan Jacobson <jidanni@HIDDEN>
Subject: bug#44959: Acknowledgement (date error message should say -I)
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Subject: bug#44959: date error message should say -I
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On 11/30/20 2:13 PM, 積丹尼 Dan Jacobson wrote:
> $ date -I=seconds
> date: invalid argument ‘=seconds’ for ‘--iso-8601’

Hmm, first of all, 'date' 8.32 outputs more than the above:

  $ date -I=seconds
  date: invalid argument '=seconds' for '--iso-8601'
  Valid arguments are:
    - 'hours'
    - 'minutes'
    - 'date'
    - 'seconds'
    - 'ns'
  Try 'date --help' for more information.

> Hey, that is a valid argument for --iso-8601. (But not for -I, so say
> that instead.)
...
> date (GNU coreutils) 8.32

From the above error message and from the --help output, one can see that
the -I option does not require the argument to be appended with "=FMT" but
just "FMT":

  $ date --help | grep -- -I
    -I[FMT], --iso-8601[=FMT]  output date/time in ISO 8601 format.

So, I'd say 'date' works as expected:

  $ date -Iseconds
  2020-11-30T14:38:35+01:00

Have a nice day,
Berny

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Subject: bug#44959: date error message should say -I
Resent-From: Chris Elvidge <celvidge001@HIDDEN>
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From: Chris Elvidge <celvidge001@HIDDEN>
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On 30/11/2020 01:40 pm, Bernhard Voelker wrote:
> On 11/30/20 2:13 PM, 積丹尼 Dan Jacobson wrote:
>> $ date -I=seconds
>> date: invalid argument ‘=seconds’ for ‘--iso-8601’
> 
> Hmm, first of all, 'date' 8.32 outputs more than the above:
> 
>    $ date -I=seconds
>    date: invalid argument '=seconds' for '--iso-8601'
>    Valid arguments are:
>      - 'hours'
>      - 'minutes'
>      - 'date'
>      - 'seconds'
>      - 'ns'
>    Try 'date --help' for more information.
> 
>> Hey, that is a valid argument for --iso-8601. (But not for -I, so say
>> that instead.)
> ...
>> date (GNU coreutils) 8.32
> 
>>From the above error message and from the --help output, one can see that
> the -I option does not require the argument to be appended with "=FMT" but
> just "FMT":
> 
>    $ date --help | grep -- -I
>      -I[FMT], --iso-8601[=FMT]  output date/time in ISO 8601 format.
> 
> So, I'd say 'date' works as expected:
> 
>    $ date -Iseconds
>    2020-11-30T14:38:35+01:00
> 
> Have a nice day,
> Berny
> 
> 
> 
> 

Is -I the only option that doesn't accept a space separator between it 
and its argument? Is that because it doesn't require an argument?

Could/Should the argument after -I be parsed and used if it is one of 
date hours minutes seconds ns? (Could it also parse for mins secs?) But 
used as a separate option if not parsed as an argument?

Is this too difficult?

Cheers

-- 

Chris Elvidge

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Well OK, but when and when not to use the "=" is not revealed by the
otherwise detailed error messages. So unless the user checks the manual,
they will never "get it".

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On 30/11/2020 15:21, 積丹尼 Dan Jacobson wrote:
> Well OK, but when and when not to use the "=" is not revealed by the
> otherwise detailed error messages. So unless the user checks the manual,
> they will never "get it".

If we were to recognize "-I seconds",
it should just be for diagnostic help.
I.e. we should minimize the combinations of valid inputs,
for compatibility, consistency, and simplicity.

I'll have a look at improving diagnostics in this area.

cheers,
Pádraig

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On 30/11/2020 17:22, Pádraig Brady wrote:
> On 30/11/2020 15:21, 積丹尼 Dan Jacobson wrote:
>> Well OK, but when and when not to use the "=" is not revealed by the
>> otherwise detailed error messages. So unless the user checks the manual,
>> they will never "get it".
> 
> If we were to recognize "-I seconds",
> it should just be for diagnostic help.
> I.e. we should minimize the combinations of valid inputs,
> for compatibility, consistency, and simplicity.
> 
> I'll have a look at improving diagnostics in this area.

This is one of the reasons we avoid args to short options,
and new short options in general.
Optional args to short options are rare in coreutils:

   $ grep -- '-[[:alpha:]]\[[A-Z]' man/*.1 | sed 's/,.*//'
   man/date.1:\fB\-I[FMT]\fR
   man/od.1:\fB\-w[BYTES]\fR
   man/pr.1:\fB\-e[CHAR[WIDTH]]\fR
   man/pr.1:\fB\-i[CHAR[WIDTH]]\fR
   man/pr.1:\fB\-n[SEP[DIGITS]]\fR
   man/pr.1:\fB\-s[CHAR]\fR
   man/pr.1:\fB\-s[CHAR]\fR turns off line truncation of all 3 column
   man/pr.1:\fB\-S[STRING]\fR

Non option args to short options as less rare:

   $ grep 'B\\-[^\].*=' man/*.1

For my reference, if we were to give explicit diagnosis of the leading '='.
we would need to update xstrtol_fatal, XARGMATCH, operand2sig, set_fields, ...

cheers,
Pádraig

Last modified: Mon, 30 Nov 2020 21:45:02 UTC

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