Le 15/01/2011 22:44, Bogdan Butnaru a écrit :
On Sat, Jan 15, 2011 at 20:01, Paul Isambert<[email protected]> wrote:
\thinspace is a \kern, which adapts to the mode it is in. What you want is
an horizontal space, but what happens is a vertical one, because the \kern
occurs in vertical mode (TeX is between paragraph at the time when \sepdash
occur, and between paragraph you're basically in vertical mode). You have to
begin the \sepdash macro with \leavevmode, so TeX switches to horinzontal
mode and typesets a horizontal space.
Oh, thanks for the explanation. It fixed that problem, but then I
noticed another one. I went through a few variations and I can’t get a
version that does what I want no matter what. Here’s what I’ve tried:
I want a typed em-dash to
1) in running text, be typeset with a small space around it
1a) ideally the space should be thin even if the source contains
spaces around it
1b) ideally the space should be glue rather than a kern, so it can
stretch a bit in stretched lines
2) line breaks should be forbidden before a dash, but should be allowed after
3) if a dash begins/ends a line, the space before/after it should disappear
4) and there should be no weird behavior otherwise...
1a) You unskip, very well.
1b) Allright, but an \hskip without plus/minus component doesn't stretch
or shrink. (I've seen such a glue in your code.)
2) and 3) seems contradictory; if linebreak can't happen before a dash,
how can it starts a line? You mean it starts a paragraph?
As for line ends, don't worry, space removal is ensured.
Your code wasn't minimal enough for me to try to make sense of it. I'll
also try to honor point 5 in your next mail, but that is a hack;
interchartoks would be better. Anyway here's a solution (untested):
\def\thedash{—}
\newskip\dashskip
\dashskip=.1em plus .1em % Or whatever else.
\def\mydash{%
\unless\ifvmode
\unskip
\nobreak
\hskip\dashskip
\fi
\thedash
\checkpunctuation
}
\makeatletter
\def\checkpunctuation{%
\@ifnextchar,{}{\@ifnextchar.{}{\@ifnextchar:{}{\@ifnextchar;{}{\hskip\dashskip}}}}%
% You should actually call with all the necessary characters.
}
\makeatother
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