[Bug 4947] New: Editor guessing algorithm should also try /etc/alternatives/editor before vi

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=4947

            Bug ID: 4947
           Summary: Editor guessing algorithm should also try
                    /etc/alternatives/editor before vi
           Product: Mercurial
           Version: 3.6.1
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: sasha2048 at gmail.com
                CC: mercurial-devel at selenic.com

According to https://www.mercurial-scm.org/wiki/editor, Mercurial tries to pick
which program to call to edit a commit message by trying the following (in
order):
1. HGEDITOR environment variable
2. editor configuration option in [ui] section (in hgrc or passed with --config
ui.editor command-line option).
3. VISUAL environment variable
4. EDITOR environment variable
5. vi, if none of the above is set

I suggest adding editor from https://wiki.debian.org/DebianAlternatives right
before "vi" (between 4 and 5):
* either by trying "editor" from $PATH;
* or by trying /etc/alternatives/editor directly.

This would make behavior more consistent on Debian (i.e.: if I already
configured default system editor, why Mercurial doesn't get it?).

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