[bug #63581] Intermediate output on sample_docs.mom causes terminal to hang

[Gene]

URL:
  <https://savannah.gnu.org/bugs/?63581>

                 Summary: Intermediate output on sample_docs.mom causes
terminal to hang
                 Project: GNU troff
               Submitter: preciouschicken
               Submitted: Tue 27 Dec 2022 03:48:55 PM UTC
                Category: Macro mom
                Severity: 3 - Normal
              Item Group: Crash/Unresponsive
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Tue 27 Dec 2022 03:48:55 PM UTC By: Gene <preciouschicken>
== Groff Version: ==
GNU groff version 1.22.4
GNU grops (groff) version 1.22.4
GNU troff (groff) version 1.22.4

== Platform: ==
Linux MyLinuxBox 5.4.228-1-MANJARO #1 SMP PREEMPT Mon Dec 19 13:16:06 UTC 2022
x86_64 GNU/Linux

== Configuration Report: == 

Name                  : groff
Version               : 1.22.4-7
Description           : GNU troff text-formatting system
URL                   : https://www.gnu.org/software/groff/groff.html
Licences              : GPL
Repository            : core
Installed Size        : 9.8 MB
Groups                : base-devel
Depends On            : perl gcc-libs
Optional Dependencies : netpbm: for use together with man -H command
interaction in browsers [Installed]
                        psutils: for use together with man -H command
interaction in browsers
                        libxaw: for gxditview [Installed]
                        perl-file-homedir: for use with glilypond
Required By           : man-db
Optional For          : --
Provides              : --
Replaces              : --
Conflicts With        : --
Packager              : Andreas Radke <andyrtr@archlinux.org>
Build Date            : Tue 29 Mar 2022 22:05:12 BST
Install Date          : Fri 15 Apr 2022 17:50:43 BST
Install Reason        : Installed as a dependency for another package
Validated By          : Signature
Backup files          : --


== Input Files: == 
'sample_docs.mom' file included in the repository

== Command Line: == 
Run the following commands:


curl
https://git.savannah.gnu.org/cgit/groff.git/plain/contrib/mom/examples/sample_docs.mom
--output sample_docs.mom
groff -m mom -Z -T utf8 sample_docs.mom


== Description Of Incorrect Behaviour: == 
Groff prints to standard output, but then the terminal hangs.  An interrupt,
^C, is then required to return the terminal to the user.   To my mind this is
incorrect behaviour on two counts:

1.  A document that exists solely to act as a 'sample' should run without
causing the terminal to hang (unless there is an intentional error, which I
couldn't see).
2.  On a deeper level it would be preferred if groff could exit in these
circumstances with an error code, rather than simply causing standard output
to hang.

NB The sample_docs.mom file self-identifies as UTF8.  Running the file without
the '-T utf8' generates no errors.

== Additional Comments: ==
I am new(ish) to Groff, so it might be that this is expected / required / in
some way useful behaviour.  Of course if this is the case then grateful for
education.

As background I'm raising this bug as it impacts on a vim plugin I've written
(https://preciouschicken.com/software/vim-groff-viewer/).  One function of the
plugin is to determine a word count for the document (obviously only counting
printed words rather than macro commands).  There were a number of ways to
achieve this, but the method that seemed to work best was using groff
intermediate output.  I tried that on a number of test files and it worked
well - until I came to 'sample_docs.mom' which causes my plugin to hang...








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