usr/lib/me/src/float.me

.nr _0 \n(c.
.de (z                  \" *** begin floating keep
.@D 4 \\$1 \\$2
.@(
.nr ?T 0
..
.de )z                  \" *** end floating keep
.sp \\n(zsu
.@)
.rr _0
.if !\\n(?b \
.       nr dn +(\\n(ppu*\\n($ru)/2u+\\n(zsu
.ie ((\\n(dn+\n(.V)>=\\n(.t):(\\n(?a) \
\{\
.       nr ?a 1
.       ds |x |t
.\}
.el \
\{\
.       nr ?b 1
.       nr _b +\\n(dnu
.       ch @f -\\n(_bu
.       ds |x |b
.\}
.da \\*(|x                      \" copy to save macro
.nf
.ls 1
.nr ?k 1
\!.if \\\\n(nl>(\\\\n(tm+2v) .ne \\n(dnu-\\n(zsu
.eo
.cc @
@|k                             \" and the body
@cc
.ec
.nr ?k 0
.rm |k                          \" remove the temp macro
.da
.in 0
.ls 1
.xl \\n($lu
.ev
..
.de @k                  \" --- output floating keep
.ev 1
.nf
.ls 1
.in 0
.sp \\n(zsu
.\\$1
.ec
.br
.rm \\$1
.ev
.nr ?T 0
..
.nr c. \n(_0