[neomutt-users] math evaluation with bc+dc

Sven Guckes neomutt-lists at guckes.net
Tue Apr 10 03:11:49 CEST 2018

* Pietro Cerutti <gahr at gahr.ch> [2018-04-10 00:57]:
> With [1] I can [do]:
> https://github.com/neomutt/neomutt/pull/1135
>    macro index,pager <f3> \
>    ':set pager_index_lines=`dc -e "50 $pager_index_lines -p"`<enter><redraw-screen>'

for those who have "bc" (binary calculator) installed:

    echo $pager_index_lines-50 | bc

untested, though, as i havent applied the patch yet.

"bc" requires BC_ENV_ARGS
to point to a config file:
export BC_ENV_ARGS=$HOME/.bcrc

all i have there is this:

as bc shows a copyright message by default
and does not load the math library,
i am using this ehll alias:

    alias bc='bc -l -q'  # libmath + quiet



BC calculating PI to thousand and ten thousand digits
$ echo 'scale=1000; 4*a(1)' | bc -l
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