[Xy-pic] \newdir

Michael Barr barr at math.mcgill.ca
Sun Mar 26 14:40:26 CEST 2017

I got an email from a user that said:

in xybarr.tex the line

\newdir_{ (}{{ }*!/-.5em/@_{(}}%

is missing, necessary to make certain hooked arrows with extra space
work correctly. 

He called it a bug.  Now I never claimed to put every arrow type into diagxy (= xybarr, not my name for it) and I admit to understanding \newdir much less well than I would like to, but I cannot get his macro to work.  In fact, if I try to compile a diagram not even using his macro, it stops on a missing number error.  On the other hand, if I comment out his macro then


  % \newdir_{ (}{{ }*!/-.5em/@_{(}}%


\Square/ (->`>`>`>/[A`B`C`D;```]


compiles fine and produces a hooked arrow.  There is a \newdir{ (}{{ }*!/-.5em/@^{(}}.  Can anyone tell me what is going on here.  What does the underscore in his \newdir mean anyway?  


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