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Re: [Groff] tbl footnotes and graph position


From: Ralph Corderoy
Subject: Re: [Groff] tbl footnotes and graph position
Date: Fri, 02 Dec 2011 10:48:59 +0000

Hi James,

> 1.   TS, tbl starts
> 2.   tbl sees T{ ... T} and invokes troff

No.  If you use groff then add its -V option to see the Unix pipeline
that is used.

    $ groff -V -t foo
    tbl foo | troff -Tps | grops
    $

tbl reads foo and ignores all lines outside of .TS-.TE, just printing
them down the pipe to troff.  .TS and .TE lines also get passed on.  The
ones between them are replaced by tbl with lower-level troff to produce
the table.

troff reads troff input, tbl isn't involved within troff, and produces
"device-independent troff" that grops then turns into PostScript.

It's a serial production line.

Cheers, Ralph.



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