[bug #61675] [me] troff warns if footnote separator wider than column

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?61675>

                 Summary: [me] troff warns if footnote separator wider than
column
                 Project: GNU troff
            Submitted by: gbranden
            Submitted on: Tue 14 Dec 2021 11:42:35 PM UTC
                Category: Macro - me
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

    _______________________________________________________

Details:

This one is pretty simple.  The `$s` macro draws a horizontal rule of 2i
without considering the possibility that the column width is shorter than
that.

Interestingly, what I thought _should_ have been a minimal reproducer didn't
work; apparently, I need the footnote separator to be drawn in a column after
the first to rouse the formatter's anger.

Input:


$ cat EXPERIMENTS/separatrix2.me
.if n .ll 65n
.de XX
.if \\$1 \{\
.  nr N \\$1
.  nr L \\$1
.  af L A
.  nop Jackdaws love my big sphinx of quartz\\nL.\c
.  ie \\nN%11=0 \{\\**
.    (f
.    nop \\** Sometimes.
.    )f
.  \}
.el \" newline
.nr N -1
.XX \\nN
.\}
..
.2c 4n 3
.pp
.if n .XX 31
.if t .XX 43


groff 1.22.4 output:


$ nroff -me EXPERIMENTS/separatrix2.me |cat -s
troff: EXPERIMENTS/separatrix2.me:20: warning [p 1, 1.2i, div '|f', 0.0i]:
can't break line

     Jackdaws  love    sphinx of quartzK.2
my  big  sphinx  of    Jackdaws   love  my
quartzAE.  Jackdaws    big    sphinx    of
love my big  sphinx    quartzJ.   Jackdaws
of quartzAD.  Jack‐    love my big  sphinx
daws  love  my  big    of  quartzI.  Jack‐
sphinx of quartzAC.    daws  love  my  big
Jackdaws  love   my    sphinx  of quartzH.
big    sphinx    of    Jackdaws  love   my
quartzAB.  Jackdaws    big    sphinx    of
love  my big sphinx    quartzG.   Jackdaws
of quartzAA.  Jack‐    love  my big sphinx
daws  love  my  big    of quartzF.   Jack‐
sphinx of  quartzZ.    daws  love  my  big
Jackdaws   love  my    sphinx of  quartzE.
big    sphinx    of    Jackdaws   love  my
quartzY.   Jackdaws    big    sphinx    of
love my big  sphinx    quartzD.   Jackdaws
of  quartzX.  Jack‐    love my big  sphinx
daws  love  my  big    of  quartzC.  Jack‐
sphinx  of quartzW.    daws  love  my  big
Jackdaws  love   my    sphinx  of quartzB.
big    sphinx    of    Jackdaws  love   my
quartzV.1  Jackdaws    big    sphinx    of
love  my big sphinx    quartzA.
of quartzU.   Jack‐
daws  love  my  big
sphinx of  quartzT.
Jackdaws   love  my
big    sphinx    of
quartzS.   Jackdaws
love my big  sphinx
of  quartzR.  Jack‐
daws  love  my  big
sphinx  of quartzQ.
Jackdaws  love   my
big    sphinx    of
quartzP.   Jackdaws
love  my big sphinx
of quartzO.   Jack‐
daws  love  my  big
sphinx of  quartzN.
Jackdaws   love  my
big    sphinx    of
quartzM.   Jackdaws
love my big  sphinx
of  quartzL.  Jack‐    ____________________
daws  love  my  big       2 Sometimes.

____________________
   1 Sometimes.



(There are other problems with footnotes in multi-column mode; as can be seen
above, the bottom of the column retreats up the page.  If you increase the
argument to the `XX` macro, you can observe this develop progressively across
all three columns.  And on typesetters, the baselines of the columns don't
align--there's a sliver of extra space at the top of the second.  These issues
are distinct and should be filed as separate tickets.)

The fix for this one appears straightforward.


@@ -1661,7 +1668,10 @@
 .      nr fp 8                 \" footnote pointsize
 .
 .de $s                 \" $$$ footnote separator
-\l'2i'
+.nr __ 2i
+.if \\n($lu<\\n(__u .nr __ \\n($lu
+\l'\\n(__u'
+.rr __
 ..
 .
 .






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