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Re: templates for galley formatting --- the basics

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Mon, 31 Jan 2000 12:13:27 -0500

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 About \par: "it can't be successfully trapped by the macro programmer" It seems to me there are two related problems. 1. Blank line should execute \GalleyCleverPar, and the most important reason for this is to put in a nobreak penalty before a following parskip. If some package redefines \par directly without awareness of \GalleyCleverPar, this is lost. 2. The well-known infinite loop problem. For 1, let's assume that the package that redefined par managed to redefine it in such a way that it succeeds at least in switching to vmode. (If not, then we are in case 2.) Then we are either at the end of a box, or some additional material will follow on the same vertical list. In the end of box case the situation is probably OK without further work? And when additional material follows it will always be the special internal galley code from \everypar, which can check for some special flag that indicates GalleyCleverPar was called? Checking \lastpenalty would probably be ideal. Ah let's see, no unfortunately the parskip gets in the way (and is not removable if we are on the MVL). So probably have to use either prevdepth or prevgraf to communicate information. Have \GalleyCleverPar set \prevgraf to some absurd value (such as maxint). Then you can check prevgraf to see if the last par was a GalleyCleverPar or a not-so-clever par. Also if we are attempting to make a big step toward LaTeX 3 at this point what about \catcode\endlinechar=10 and require explicit markup (\p, \para, \endpara?) instead of blank lines. I seem to recall from earlier LaTeX 3 discussions that this appeared to be a necessary step sooner or later for other reasons.