On Thu 06 Mar 2014 18:08:10 Keith Marshall wrote: > On 06/03/14 16:21, Deri James wrote: > > If you are not using mom the actual command is:- > > > > groff -Tpdf -dPDF.EXPORT=1 -z $cmdstring 2>&1 \ > > > > | grep '^.ds' | groff -Tpdf - $preconv $cmdstring > > So, you're assuming that just one preliminary pass is sufficient to > resolve the cross references? That may not be so, and pdfroff is not so > naive; it performs at least two such passes, and then as many more as > may be necessary, until two consecutive passes generate identical > reference dictionaries, (or until it becomes clear that no ultimately > stable layout is achievable).
It's a bit simpler for me because part of the logic is in the output driver (gropdf). All I need are the tag names and the descriptive text associated with them. The positioning of hot spots is done with these calls to gropdf:- \X’pdf: markstart /ANN definition’ and \X’pdf: markend’ So if the hotspot "moves" due to previously unfound references which are expanded on the second run, the markers also move. (There are also a pair of other commands - \X’pdf: marksuspend’ and \X’pdf: markrestart’ which are intended to be used in page trap macros to prevent headings/footings being included in the hot spotting when the hotspot crosses a page boundary). I had it much easier than you having to do the hotspot location calculations in a groff macro. > > Keith, is there any chance I could add something along these lines to > > pdfroff if the -T pdf switch is passed to pdfroff? > > Sure. You have the source, to modify as you see fit, (or, are you > asking me to help you with that?) No, I'm happy to suggest a patch, it's just that your scripting style/knowledge is far superior so I would welcome the opurtunity to send it to you for perusal first. Deri
