[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Groff] condition: OR of two string comparisons

From: Ralph Corderoy
Subject: Re: [Groff] condition: OR of two string comparisons
Date: Fri, 07 Nov 2014 16:16:38 +0000

Hi Holger,

> Due to the 'Troff User's Manual' page 24 and the man 7 groff (missing
> a negation)

What's missing?

> the statement:
> .if 'str1'str2' anything
> cannot handle regular expressions or kinda glob-ing as patterns?

Correct.  It's not a simple string compare though, groff's info manual
explains more.

    info groff 2>/dev/null |
    sed -n '/Node: Operators in Conditionals/,/^File:/p'

You can get close with De Morgans to turn a|b into !(!a&!b) and chain
two .ifs to do the & with the first being a .ie so the .el mops up, but
it misses one of the cases.

BTW, do any info experts know how to have info(1) format just that node?
-n doesn't work to visit that node, it thinks it doesn't exist even
though it's printing that as the node name.  I guess it's looking
somewhere else for -n.

    $ info -n 'Operators in Conditionals' groff
    info: Cannot find node `Operators in Conditionals'.

Cheers, Ralph.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]