[texhax] Checking the length of paragraph last line

Uwe Lück uwe.lueck at web.de
Sat Oct 15 18:14:49 CEST 2005

At 22:48 14.10.05, Robin Fairbairns wrote:
> > Fifteen or so years back, someone came up with a macro that would, in
> > effect, measure the last line of a paragraph so that you could decide
> > whether to put an identifying tag (like an author's name) in the white
> > space after a short final line or on the next line if the paragraph
> > final line stretched near the right margin.
>you don't mean the thing in the texbook, do you?  my copy's isolated
>from my by the stairs and the arthritis, but the source has
>\def\signed #1 (#2){{\unskip\nobreak\hfil\penalty50\hskip2em
>   \hbox{}\nobreak\hfil\sl#1\/ \rm(#2)
>   \parfillskip=0pt \finalhyphendemerits=0 \endgraf}}
>which he then uses as
>\vbox{\hsize 3.0in \parindent0pt
>   This is a case where the name and address fit in nicely with the review.
>   \signed A. Reviewer (Ann Arbor, Mich.)
>   \medskip
>   But sometimes an extra line must be added. \signed N. Bourbaki (Paris)}

Indeed, it's TeXbook p. 106, as I tried to contribute to the discussion
William mentions:

The problem is analogous to placing the author's name right-aligned
after a short text, which TeXbook p. 14 deals with. Accordingly, an
alternative would be something like


Strangely ... 14 is the number of the chapter, not the page.
Sorry if somebody was mislead.
(And something like \qquad preceding \null was really missing.)


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