[bug #66150] [troff] should accept 'p' scaling unit where 'z' is accepted

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?66150>

                 Summary: [troff] should accept 'p' scaling unit where 'z' is
accepted
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Sat 31 Aug 2024 04:14:12 AM UTC
                Category: Core
                Severity: 1 - Wish
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sat 31 Aug 2024 04:14:12 AM UTC By: G. Branden Robinson <gbranden>

$ printf '\\s"10p"\n' | groff -ww -z
troff:<standard input>:1: warning: 'p' scaling unit invalid in context;
convert to 'z' or 'u'


Since a conversion of 'p' (points) to 'z' (scaled points) is **always**
defined (sometimes it is the identity transformation), we should be able to
accept the 'p' scaling unit in these contexts.

Also, I am dubious about accepting the scaling unit 'u' here--it does not
always mean "dimensionless", but rather the device's basic unit, which _is_ a
length measure.  Can we get away with not supporting 'u' in font-related
requests and escape sequences?







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