URL:
<https://savannah.gnu.org/bugs/?64728>
Summary: Wrong width of lined-up eqn equation reported by
diversion
Group: GNU roff
Submitter: None
Submitted: Sat 30 Sep 2023 01:09:39 PM UTC
Category: None
Severity: 3 - Normal
Item Group: Incorrect behaviour
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
_______________________________________________________
Follow-up Comments:
-------------------------------------------------------
Date: Sat 30 Sep 2023 01:09:39 PM UTC By: Anonymous
Using a diversion to capture the output of an eqn equation with the lineup
indicator when there is an earlier equation with the mark indicator seemingly
gives the wrong width of this lineup equation, in both troff and nroff.
In the example below, two different equations are processed: (1) with a mark
indicator, and (2), printed once without and once with a lineup indicator,
that is longer and has a common start with equation (1) before the indicators,
such that output of both variants of (2) should look the same. However, the
width of (2) with lineup indicator as reported by troff and nroff is not equal
to the width of (2) without the lineup indicator (and equals the width of (1)
in case of troff). For reference, I added the output of the latest
(development snapshot) of Heirloom doctools, with the logical output.
$ cat mark_lineup_diversion
.di xx
.EQ
x mark = 1 + 1
.EN
.br
.di
\*(xx
.tm Width of (diversed) 1: \n(dl
.di xx
.EQ
x = 1 - 1 + 1 - 1 + 2
.EN
.br
.di
\*(xx
.tm Width of (diversed) 2: \n(dl
.di xx
.EQ
x lineup = 1 - 1 + 1 - 1 + 2
.EN
.br
.di
\*(xx
.tm Width of (diversed) 2 (using lineup): \n(dl
$ /usr/local/bin/neqn --version
GNU eqn (groff) version 1.23.0
$ /usr/local/bin/nroff --version
GNU nroff (groff) version 1.23.0
GNU groff version 1.23.0
Copyright (C) 2022 Free Software Foundation, Inc.
GNU groff comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of groff and its subprograms
under the terms of the GNU General Public License.
For more information about these matters, see the file
named COPYING.
called subprograms:
GNU grotty (groff) version 1.23.0
GNU troff (groff) version 1.23.0
$ cat mark_lineup_diversion | /usr/local/bin/neqn -Tascii |
/usr/local/bin/nroff -Tascii | sed '/^$/d'
Width of (diversed) 1: 120
Width of (diversed) 2: 264
Width of (diversed) 2 (using lineup): 96
x=1+1
x=1-1+1-1+2
x=1-1+1-1+2
$ cat mark_lineup_diversion | /usr/local/ucb/neqn | /usr/local/ucb/nroff | sed
'/^$/d'
Width of (diversed) 1: 120
x=1+1
Width of (diversed) 2: 264
x=1-1+1-1+2
Width of (diversed) 2 (using lineup): 264
x=1-1+1-1+2
$ cat mark_lineup_diversion | /usr/local/bin/eqn | /usr/local/bin/troff >
/dev/null
Width of (diversed) 1: 36720
Width of (diversed) 2: 81390
Width of (diversed) 2 (using lineup): 36720
$ cat mark_lineup_diversion | /usr/local/ucb/eqn | /usr/local/ucb/troff >
/dev/null
Width of (diversed) 1: 27086
Width of (diversed) 2: 58556
Width of (diversed) 2 (using lineup): 58556
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