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Re: [bug #50770] .PSPIC macro at bottom of page causes unwarranted page

From: Steffen Nurpmeso
Subject: Re: [bug #50770] .PSPIC macro at bottom of page causes unwarranted page break
Date: Thu, 04 May 2017 22:21:18 +0200
User-agent: s-nail v14.9.0-pre4-37-gf921ae51

Ok, i am no wizard, but

Deri James <address@hidden> wrote:
 |Follow-up Comment #8, bug #50770 (project groff):
 |> Sorry if I was unclear.  I am referring to the case where an image fits at
 |> the bottom of a page, but PSPIC insists on moving it to the next page
 |> anyway, because +1v.  This move only results in an empty space that could
 |> have been filled with something useful.
 |Yes, so the maximum amount of usable space which is lost, is 1v. So for a
 |large graphic the percentage lost is small.
 |> I'm no macro wizard, but surely there is a way for PSPIC to supply \
 |> vertical
 |> space below the image if text continues there, while still allowing the
 |> image to sit at the bottom of a page.
 |I have not earned my wizarding wand either, but I do know that groff is a
 |single pass system, so you don't know what is following. You do know the
 |position on the page where the next output will occur but this does not help
 |if PSPIC was called within a diversion which is subsequently then output \
 |at a
 |later point.
 |We need a wizard!

How about adding a new argument -N which does not add anything,
then it is up to the user to decide what to do.  Something like

TODO: no idea of HTML yet, and i think the height and width
arguments should be passable without units, this yet seems to

diff --git a/tmac/pspic.tmac b/tmac/pspic.tmac
index 8a8cdd2c..c3fbc7f6 100644
--- a/tmac/pspic.tmac
+++ b/tmac/pspic.tmac
@@ -9,7 +9,7 @@
 .\" Usage:
-.\"   .PSPIC [-L|-R|-C|-I <indent>] <file> [<width> [<height>]]
+.\"   .PSPIC [-L|-R|-C|-I <indent>] [-N] <file> [<width> [<height>]]
 .do if d PSPIC .nx
@@ -47,6 +47,12 @@
 .      \}
 .    \}
 .  \}
+.  \" No vertical space
+.  ie '\\$1'-N' \{\
+.    nr ps-vspace 0v
+.    shift
+.  \}
+.  el .nr ps-vspace 1v
 .  br
@@ -87,7 +93,7 @@
 .    \}
 .    \" reserve vertical space for image
-.    ne (\\n[ps-desht]u + 1v)
+.    ne (\\n[ps-desht]u + \\n[ps-vspace]u)
 .    \" compute image offset w.r.t. the current left margin
 .    if (\\n[ps-offset-mode] == 0) \

|Ralph says i must not use signatures which spread the light!

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