On Thu, 14 Feb 2019 13:02:21 +0100 Hans Hagen <j.ha...@xs4all.nl> wrote:
> On 2/13/2019 7:12 PM, Alan Braslau wrote: > > Not just the latest beta ... and indeed according to the TeXbook this > > should be a vertical double bar (\Vert), in math mode. > > > > I wish to point out that | in text font (text mode) is different from | in > > math font (math mode). I noticed that Preview (on the mac) *fails* to > > render the math font $|$ whereas \| in text mode does get rendered in > > Preview or printed from Preview (my document used dejavu fonts). Other pdf > > renderers on the mac (acroread, mupdf, evince, ...) are OK. This is clearly > > a bug in Preview. > > > > How, other then \|, should one produce | in *text* mode? > does \textbar work? Now, this is really interesting \starttext \textbar x\textbar \stoptext produces |x| as seen by acroread, mupdf, evince, ... on the Mac BUT shows | | with preview and with skim (which uses the Apple pdf rendering engine). Thus, the Apple *bug* is perverse. (Would another Mac user confirm this.) Using \textbar is fine as a fallback, but much less convenient (and readable) than a shorthand. Two questions: 1) $\|$ SHOULD produce ‖ according to the TeXbook, so we cannot dispute Knuth's choice. \| may be undefined in the bible for textmode, but logic would have it also yield ‖ in a text font. 2) I guess | is active in text mode (and used as a delimiter in column specifications, for example, i.e. \starttabulate [|l|l|]). I have always felt a bit uncomfortable with this, having in a far past come from LaTeX practice where it defined a vertical line. Our solution in ConTeXt is to use UTF-8 input, so ‖ for a double vertical bar. Therefore, | SHOULD produce a single vertical bar, thus it should not be active. Is this possible? (Also, as a bonus, || should be taken as a ligature.) Alan ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________
