[Bug 6884] New: hg grep confusingly mixes warning message into normal output

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6884

            Bug ID: 6884
           Summary: hg grep confusingly mixes warning message into normal
                    output
           Product: Mercurial
           Version: 6.7.4
          Hardware: PC
                OS: NetBSD
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at mercurial-scm.org
          Reporter: mercurial-bugzilla at campbell.mumble.net
                CC: mercurial-devel at mercurial-scm.org
    Python Version: ---

When I haven't set ui.username in my hgrc, hg grep prints a warning about it,
but it's mixed into the regular output, even with a pager.  For example, when I
run `hg grep revset' in the Mercurial hg repository, I get:

Makefileno username found, using 'riastradh at singbulli.local' instead
:         mercurial/fileset.py mercurial/revset.py \
contrib/all-revsets.txt:# All revsets ever used with revsetbenchmarks.py script
contrib/all-revsets.txt:# The goal of this file is to gather all revsets ever
used for benchmarking
...

I can't imagine why hg grep would want ui.username in the first place.  It
looks like the `hg grep -u' option uses it to show my own configured username
on each line, but I don't understand why it would do that.  But even if there's
a reason for that, hg grep shouldn't print a warning when it's not using the
username, and any warning certainly shouldn't be intermingled into the regular
grep output.

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