At 2024-04-02T18:51:51+0200, Tadziu Hoffmann wrote: > > > Also interesting to see that in this word, the hyphenation > > > patterns don't suggest a hyphenation opportunity after "anti". > > > The leading `\%` prevents that. > > Sorry, I meant even without "\%". With a line length of 1 en, > and without any "\%" at all, groff prints > > an- > tidis- > es- > tab- > lish- > men- > tar- > i- > an- > ism
Yes. > and Heirloom troff prints > > an- > tidises- > ta- > blish- > men- > tari- > an- > ism > > TeX gives the same as groff since it uses the same > hyphenation patterns (groff borrowed them from TeX). Yes. And as you noted, its weird that these patterns don't admit "anti-". > For "antidisestablishmen\%tarianism", groff prints > > antidisestablishmen- > tar- > i- > an- > ism > > (which I think is strange), Yeah, that's a bug. I think the "don't automatically hyphenate this word" flag is getting unconditionally reset after an output line is flushed, and it should not be. > while TeX and Heirloom troff print > > antidisestablishmen- > tarianism > > which I think is the only reasonable way of handling this case. Agreed. > (I remember in Word it was only possible to add additional > hyphenation points, but not to inhibit existing ones, which > is a terrible idea if one of the builtin ones turns out to > be wrong.) Yup. So our example document need only do this: $ hyphen 'anti\%disestablishmentarianism' anti‐dis‐es‐tab‐lish‐men‐tar‐i‐an‐ism https://froude.eu/groff/examples/hyphenation-points.html > For "\%antidisestablishmen\%tarianism", Heirloom troff does not > hyphenate at all (even if the word contains additional "\%"), > whereas groff and TeX do the same as they did with only the > inner "\%". (Also, "\&" is not a letter, so a leading "\&" > should not influence hyphenation at all.) Agreed. `\&` is not a letter, but it works like a letter in some ways, namely in suppressing end-of-sentence detection. It's truly a magical device. https://www.gnu.org/software/groff/manual/groff.html.node/Dummy-Characters.html > With *only* the leading "\%", ("\%antidisestablishmentarianism"), > none of the formatters hyphenates, which is correct. Agreed. > Of the three formatters, TeX's behavior appears to be the most > sensible to me, i.e., if the word contains one or more "\%", > *only* those points (but all of them) will be considered > for hyphenation. Yes. Let's fix that. Regards, Branden
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