Re: Warn about long lines

[Alejandro Colomar]

Hi Ralph,

On 8/23/22 14:51, Ralph Corderoy wrote:
> Hi Alejandro,
>
> > >       ! groff -Tutf8 -man -ww longline.man |
> > >       expand |
> > >       grep '^.\{80\}.'
> >
> > Ahh, I forgot about \{N\}, since I never use it.
> >
> > Still, the Makefile uses pipefail, so I'm not sure how to make grep(1)
> > work for this.  If it works, it would be nice.
>
> Move the inversion along the pipeline with a subshell.
>
>      $ awk '{print FILENAME, length}' *
>      79 79
>      80 80
>      81 81
>      $
>      $ set -o pipefail
>      $ false | (! grep '^.\{80\}.' 79); echo $?
>      1
>      $ false | (! grep '^.\{80\}.' 80); echo $?
>      1
>      $ false | (! grep '^.\{80\}.' 81); echo $?
>      
> .................................................................................
>      1
>      $
>      $ true | (! grep '^.\{80\}.' 79); echo $?
>      0
>      $ true | (! grep '^.\{80\}.' 80); echo $?
>      0
>      $ true | (! grep '^.\{80\}.' 81); echo $?
>      
> .................................................................................
>      1
>      $

May I tell groff(1) (grotty(1)) that the terminal width is 80, no matter 
what it actually is?  Otherwise, I can only run the above in <=80-col 
terminals.

Cheers,

Alex
--
Alejandro Colomar
<http://www.alejandro-colomar.es/>

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