[tex-k] trouble with webmac21.tex

[Andreas Scherer]

I'm sorry to have caused problems in 'webmac.tex'. ;o)

  > Andreas [...·] proposed a patch for webmac.tex to do the same.
That seems to be related to this commit: 
https://github.com/ascherer/web/commit/207ea7964124f3115f68036eac884fed3206df23 
in my https://github.com/ascherer/web project.  (I'm not quite sure 
which of the related versions reached DEK in May 2020 and why he chose 
to do 'webmac 4.2' the way it turned out.)

The spinoff 'pwebmac.tex' evolved these macros further and now it uses 
both parts of the '\topmark': 
https://github.com/ascherer/web/blob/master/pwebmac.tex#L247 -- Note 
that '\rhead' has been renamed to '\grouptitle' as in 'cwebmac.tex', in 
order to make the hackery in 'makeall' work for both CWEB and WEB input: 
https://github.com/ascherer/web/blob/master/makeall#L159

In preparation of the "library" of PDF documents from some C/WEB sources 
in TeX Live 
(https://github.com/ascherer/web/releases/download/ctan-20210211/pdf.tar.gz 
has the most recent results) I'm using 'webmac.tex 4.2' for reference 
and 'pwebmac.tex' for the PDF output (in combination with 
'pdfwebtocfront.tex').  I'm running "TeX 3.14159265", "pdfTeX 
3.14159265-2.6-1.40.21", and "XeTeX 3.14159265-2.6-0.999992", all from 
"TeX Live 2020".

Comparing just the "plain TeX" runs with both 'webmac 4.2' and 'pwebmac' 
as macros and both '\let\maybe=\iffalse' and '\let\maybe=\iftrue' in 
'tex-final.ch' gives the statistics attached.  I don't have 'webmac 4.1' 
at hand, so I can't compare the older version at this time.  Note that 
'pwebmac' uses significantly more resources than 'webmac' in all 
comparisons.

Hope this helps,
Andreas

PS: I have noticed that after the recent tuneup, only 'tex.tex' 
(tex.web+tex-final.ch) doesn't pick up '\pageno=2' from 
'pdfwebtocfront.tex' 
(https://github.com/ascherer/cwebbin/blob/master/texinputs/pdfwebtocfront.tex#L52), 
so the main body starts on page '4', but 'pdftex.tex', 'xetex.tex', and 
'mf.tex' still do start on page '3'.  Time permitting, I'll try to fix this.
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