[pdftex] pdfTeX, Edmac and margin kerning

[The Thanh Han]

I confirm this is a bug of pdftex. I don't know how to fix it yet, at the
moment a workaround is to use \unhcopy instead of \unhbox on the following
line (582):

  \hfil\hbox to \wd\one at line{\new at line\unhbox\one at line}}}%

Thanh

On Thu, Nov 14, 2002 at 02:28:47PM +0100, Oliver Heins wrote:
> I posted the following text to the german TeX-Newsgroup some days ago,
> but didn't get an answer (yet).  So I decided to translate it and repost
> it here.  Please excuse my bad english.
> 
> I would like to typeset the text of a critical edition with optical
> margin adjustment.  The edition is tyepesetted with edmac
> (<http://www.homepages.ucl.ac.uk/~ucgadkw/edmac/index.html>) under plain
> TeX.  Edmac und optical margin adjustment don't seem to cooperate with
> each other, as it can be seen in the following minimalexample.  My
> question is, how Han The Than's pdfTeX-hack is implemented, I read his
> thesis (or at least the according chapters), but still don't know where
> it's done: At the level of TeX's primitives (as I guess), or on the
> level of macros?  If it's implemented based on the primitives, why
> doesn't it work with edmac?
> 
> I post a minimal example and try to show how the edmac's macros \pstart
> and \pend, which obviously prevent character protruding, work and how
> they change plain TeX's behaviour.
> 
> 
> ------- Schnipp --------
> % minimal example: edmac with (i.e. without) optical margin adjustment
> 
> \hsize=3.2in
> 
> \input edmac.doc
> 
> \input protcode
> \setprotcode\font
> \pdfprotrudechars=1
> 
> \beginnumbering
> 
> \pstart
> 
> EDMAC is a program written as a set of plain TeX macros for formatting
> complex critical editions. You mark up your text and notes using the
> tags provided by EDMAC, and then TeX will create a beautiful book for
> you with the text line numbered, lemmata referred to by line-number, up
> to six layers of notes at the bottom of the page (variants, testimonia,
> etc.), as well as up to six sets of notes sent to appendices. It is also
> possible to control the layout of each layer of notes separately: single
> column, two- or three-column, paragraphed, etc.
> 
> \pend
> 
> EDMAC is a program written as a set of plain TeX macros for formatting
> complex critical editions. You mark up your text and notes using the
> tags provided by EDMAC, and then TeX will create a beautiful book for
> you with the text line numbered, lemmata referred to by line-number, up
> to six layers of notes at the bottom of the page (variants, testimonia,
> etc.), as well as up to six sets of notes sent to appendices. It is also
> possible to control the layout of each layer of notes separately: single
> column, two- or three-column, paragraphed, etc.
> 
> \endnumbering
> 
> \bye
> 
> ------- Schnapp --------
> 
> 
> edmac.doc:
> http://www.ctan.org/tex-archive/macros/plain/contrib/edmac/edmac316.zip
> 
> protcode:
> http://sunsite.utk.edu/ftp/usr-218-2/CTAN/obsolete/systems/pdftex/ext/
> there beside protcode.tex abbr.tex, too
> 
> Above example compiled:
> http://www.offizinverlag.de/edmactest.pdf
> 
> 
> Beside the fact, that the lower section isn't really typeset the way it
> should be, pdfTeX (tested: pdfTeX (Web2C 7.3.7)
> 3.14159-1.00a-pretest-20011114-ojmw from Debian Woody's teTeX and pdfTeX
> (Web2C 7.3.9) 3.14159-1.10a-devel from experimental Debian packages of
> the newest neuesten teTeX beta (AFAIK)) at least does margin kerning
> there.  In the upper section, with activated edmac, it does nothing
> (visible).
> 
> Edmac changes TeX's ouput-routine.  Everything within a \pstart
>  ... \pend-environment ist put in a box.  The definition of \pstart says:
> "\global\setbox\raw at text=\vbox\bgroup", what is ended in \pend (with
> "\egroup").  The changed output routine now calls macro a named
> \do at line, which fetches one line of text and writes it in a horizontal
> box: "\global\setbox\one at line=\vsplit\raw at text to\baselineskip
> \unvbox\one at line \global\setbox\one at line=\lastbox", then checks whether
> a line number is to be set and does so, if possible: "\hbox to
> \hsize{\affixline at num% this sets the linenumber 
> \hfil\hbox to \wd\one at line{\new at line\unhbox\one at line}}}".  The macro
> \new at line only writes the current linenumber to an auxilary file.
> 
> The output-routine of edmac doesn't differs IMHO from plain TeX's, it
> mainly does a \topins and a \footins.
> 
> Worth mentioning is, that level 2 margin kerining (\pdfprotrudechars=2)
> changes the linebreaking, it is obviously computed by the new algorithm.
> Nevertheless, the actual protruding -- the shifting of the margin
> characters around the margin -- isn't done.
> 
> 
> Rather helpless,
> olli
> 
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