[bug #64267] Missing blank before SH due to PD 0 IP PD

[Alejandro Colomar]

URL:
  <https://savannah.gnu.org/bugs/?64267>

                 Summary: Missing blank before SH due to PD 0 IP PD
                   Group: GNU roff
               Submitter: alx
               Submitted: Wed 31 May 2023 09:41:32 PM UTC
                Category: Macro man
                Severity: 3 - Normal
              Item Group: Rendering/Cosmetics
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 31 May 2023 09:41:32 PM UTC By: Alejandro Colomar <alx>
I had a typo in a man(7) page where for some reason I slipped an .IP
in the wrong place.  I had no warnings about that IP.  Neither
groff(1) nor mandoc(1) complained about it.  And BTW, mandoc(1)'s
behavior seems the right one to me.

We're lucky that this is not a regression, since groff-1.22.4 is
crappier (it has the same bug, and it even blows me with blank lines
in other unwanted places).

Here's the source:

 cat missing_blank.man 
.TH a s d f
.SH qwe
rty.
.IP \[bu] 3
asd.
.PD 0
.IP \[bu] 3
fgh.
.IP
.PD
.SH jkl
zxc.

And here's what different formatters have to say about it:

$ /usr/bin/groff -ww -man -Tutf8 ./missing_blank.man
a(s)                                                                     
a(s)



qwe
       rty.

       •  asd.
       •  fgh.
jkl
       zxc.



f                                      d                                 
a(s)


$ /usr/local/bin/groff -ww -rCHECKSTYLE=3 -man -Tutf8 ./missing_blank.man
an.tmac:./missing_blank.man:1: style: .TH missing fifth argument and second
argument 's' not a recognized manual section; specify its title
an.tmac:./missing_blank.man:6: style: use of deprecated macro: .PD
an.tmac:./missing_blank.man:10: style: use of deprecated macro: .PD
a(s)                                                                     
a(s)

qwe
       rty.

       •  asd.
       •  fgh.
jkl
       zxc.

f                                      d                                 
a(s)


$ mandoc -Tlint ./missing_blank.man
mandoc: ./missing_blank.man:1:5: STYLE: lower case character in document
title: TH a
mandoc: ./missing_blank.man:1:9: WARNING: cannot parse date, using it
verbatim: TH d


$ mandoc -man ./missing_blank.man
a(s)                                                                     
a(s)

qwe
       rty.

       •  asd.
       •  fgh.

jkl
       zxc.

f                                      d                                 
a(s)


We can see how mandoc(1), even if it doesn't warn about an ignored IP,
it correctly puts a blank before "jkl".







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