[texhax] Oblique cancellation with plain TeX

[Rodolfo Medina]

David Carlisle <d.p.carlisle at gmail.com> writes:

> On Fri, 4 Jan 2019 at 22:05, Rodolfo Medina <rodolfo.medina at gmail.com> wrote:
>>
>> David Carlisle <d.p.carlisle at gmail.com> writes:
>>
>> > \input picture
>> > \catcode`\@=11
>> >
>> > \RequirePackage{cancel}
>> > \let\zzcancel\cancel
>> > \def\cancel#1{{%
>> > \let\line\LaTeX at line
>> > \zzcancel{#1}}}
>> >
>> > $\cancel{x^2 + 1}$
>> >
>> > $\cancel{a}$
>> >
>> > $\cancel{{x^2 + 1 \over b}}$
>> >
>> >
>> > \bye
>>
>>
>> Fantastic...!!
>
> Of course simply using latex gives a better tested codepath than
> loading a large chunk of latex circa 1993  but you seem to want to
> avoid doing that for some reason.


I've got tons of documents now written in plain TeX and complexly organized
with macros...  Besides, I imagine LaTeX couldn't do certain things plain TeX
allows me to do...  Cross references between different files, documents living
at same time as single articles or/and chapters of book...

Rodolfo