URL:
<https://savannah.gnu.org/bugs/?64453>
Summary: [grohtml] man+IP+UR with empty link text sends state
machine into wilderness
Group: GNU roff
Submitter: gbranden
Submitted: Fri 21 Jul 2023 09:37:30 AM UTC
Category: Driver grohtml
Severity: 3 - Normal
Item Group: Incorrect behaviour
Status: Confirmed
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
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Follow-up Comments:
-------------------------------------------------------
Date: Fri 21 Jul 2023 09:37:30 AM UTC By: G. Branden Robinson <gbranden>
Originally reported by Jakub Wilk as
[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1018965 Debian #1018965].
Reproducer:
$ cat ATTIC/IP-UR.man
.TH
.IP 1. 4
.UR https://bar.example
.UE
A workaround is not to leave the text empty, though that is supported (and
used by _groff_'s own man pages, in _grotty_(1) and _pic_(1)).
It won't do to just blindly stick a <td> in front of the link text in this
case:
diff --git a/tmac/an.tmac b/tmac/an.tmac
index 33e88be62..732eb026a 100644
--- a/tmac/an.tmac
+++ b/tmac/an.tmac
@@ -1105,8 +1105,9 @@ contains unsupported escape sequence
. \" If there was no link text, format URI as its own link text. We
. \" don't add angle brackets here.
. el \{\
+. an-warn GBR: no URI
. if \\n[an*is-output-html] \
-. nop \X^html:<a href="\\*[an*prefix]\\*[an*hyperlink]">\
+. nop \X^html:<td><a href="\\*[an*prefix]\\*[an*hyperlink]">\
\\*[an*hyperlink]</a>^\c
. if \\n[an*is-output-terminal] \
. nop \X^tty: link \\*[an*prefix]\\*[an*hyperlink]^\
...since that introduces spurious `td` tags into URIs without linked text that
are not in "lists" (indented paragraphs).
My surmise is that the state machine _grohtml_ uses has gotten confused.
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