I needed to duplex-print the output of fop, so I came up with this heavy-handed
solution:
$ fop -q -fo x.fo -pdf - |
gs -sDEVICE=pxlmono -dDuplex -q -o - |
nc $myprinter 9100
The changes necessary to make that work for PS output should be obvious.
A much more lightweight solution would be for FOP to emit the necessary printer
code within the PCL or PS output, rather than send it through Ghostscript to be
completely reprocessed. It could be tied to a new command line option, e.g.
-duplex=long.
I tried sending the PCL code to enable long-edge duplexing to the printer
before sending the fop -pcl output to the printer, but it didn’t have any
effect, apparently because the fop -pcl output resets the printing mode somehow.
(See: http://www.pclviewer.com/resources/reference/)
I’m posting for two reasons:
1. To get my heavy-handed solution out into the world.
2. To try and get someone interested in implementing my lightweight
alternative. Ideally, both PCL and PS outputs would get this feature, but if
it’s only one, we’d prefer PCL, since it renders faster on most printers.
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