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Re: completion-prefix-display-length doesn't check for common prefix


From: Chet Ramey
Subject: Re: completion-prefix-display-length doesn't check for common prefix
Date: Sun, 24 Apr 2016 19:29:18 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Thunderbird/38.7.2

On 4/24/16 3:36 PM, Grisha Levit wrote:
> On Fri, Apr 22, 2016 at 3:23 PM, Chet Ramey address@hidden
> <http://mailto:address@hidden> wrote:
> 
>     Bash-4.4 doesn’t do this.
> 
> I was testing this with the latest devel version.
> 
> |$ echo$BASH_VERSION4.4.0(2)-rc1$ cat .inputrc set
> completion-prefix-display-length 2$ f() { COMPREPLY=(aaaaa bbbbb ccccc); };
> complete -F f f $ f ddd<TAB><TAB>aaaaa bbbbb ccccc $ f dddd<TAB><TAB>...a
> ...b ...c |

I figured it out.  Readline uses what the user typed as the common prefix
if there are multiple matches that don't share a prefix at all.  It's been
like that for many years; I'm not going to change it before bash-4.4.  The
common prefix (and its length) is what is used to determine whether or not
the prefix display length code is active.

I'll look at changing this after bash-4.4 is released.  That's essentially
the cause of all the strange behavior, which is fairly rare.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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