Re: review: psql and pset without any arguments

Le 07/09/2013 10:02, Pavel Stehule a écrit :
> Hello
>
> * patch is cleanly patchable and compilation is without warnings
> * all regression tests passed
> * no impact on dump, performance or any current features
> * no comments to programming style
> * we would this feature - it is consistent with \set and it gives a
> fast resume about psql printer settings
>
> Issues:
> 1) it doesn't show linestyle when is default
>
> I looked there and it is probably a small different issue - this value
> is initialized as NULL as default. But I dislike a empty output in
> this case:
>
>     else if (strcmp(param, "linestyle") == 0)
>     {
>         if (!popt->topt.line_style)
>             ;
>         else
>             printf(_("Line style is %s.\n"),
>                    get_line_style(&popt->topt)->name);
>     }
>
> I propose a verbose result instead nothing:
>
>     else if (strcmp(param, "linestyle") == 0)
>     {
>         if (!popt->topt.line_style)
>            printf(_("Line style is unset.\n")) ;
>         else
>             printf(_("Line style is %s.\n"),
>                    get_line_style(&popt->topt)->name);
>     }

+1 to show the information even if linestyle is not set but by default
get_line_style() return "ascii" if linestyle is not set. So maybe it is
better to  rewrite it as follow:
   else if (strcmp(param, "linestyle") == 0)   {           printf(_("Line style is %s.\n"),
get_line_style(&popt->topt)->name);  }
 

This will output:
   Line style is ascii.

when linestyle is not set or of course it is set to ascii.

> 2) there is only one open question
> http://www.postgresql.org/message-id/B6F6FD62F2624C4C9916AC0175D56D880CE00E0E@jenmbs01.ad.intershop.net
> - there is no clean relation between output and some pset option.
>   
> I don't think so Marc' proposal is ideal (these values are not a
> variables) - but maybe some enhanced output (only for this resume) can
> be better:
>
> postgres=# \pset
> Output format (format) is aligned.
> Border style (border) is 1.
> Expanded display (expanded) is off.
> Null display (null) is "".
> Field separator (fieldsep) is "|".
> Tuples only (tuples_only) is off.
> Title (title) is unset.
> Table attributes (tableattr) unset.
> Pager (pager) is used for long output.
> Record separator (recordsep) is <newline>.
>
> This expanded output should be used only for this resume (not when a
> option was changed or individual ask on option value)

Yes this could be a good accommodation but I really prefer to not
duplicate code and translation between this resume and the output when
these options are set. If we can print the same output messages using:
   postgres=# \pset fieldsep '|'   Field separator (fieldsep) is "|".

it could be a good compromise.

Regards,

-- 
Gilles Darold
Administrateur de bases de données
http://dalibo.com - http://dalibo.org