[arch-general] dd and bash_completion

[Aaron Griffin]

On Thu, Sep 24, 2009 at 3:15 PM, Aaron Griffin <aaronmgriffin at gmail.com> wrote:
> On Thu, Sep 24, 2009 at 2:41 PM, Thomas Göbel <goebel.thomas at gmx.net> wrote:
>> * <aaronmgriffin at gmail.com> [24.09.2009 21:27]:
>>> On Thu, Sep 24, 2009 at 7:39 AM, Thomas Bächler <thomas at archlinux.org> wrote:
>>> > Xavier schrieb:
>>> >>
>>> >> I just tried git, before realizing there was a good pkgbuild for it :
>>> >> http://aur.archlinux.org/packages.php?ID=27520
>>> >>
>>> >> and it does not work either.
>>> >
>>> > I also checked the git code for dd and it is identical to the 1.0 code.
>>>
>>> Found the issue. It's not dd specific at all, it has to do with bash's
>>> setting of the COMP_WORDBREAKS
>>>
>>> $ echo $COMP_WORDBREAKS
>>> "'><=;|&(:
>>>
>>> These are word separators for completion words. The command "dd
>>> if=<tab>" contains 3 completion words - "dd", "if", and "=" with the
>>> current word being "=".
>>>
>>> If you do the following, it works:
>>>
>>> $ export COMP_WORDBREAKS=${COMP_WORDBREAKS//=}
>>> $ dd if=<tab>
>>>
>>> I suggest reporting this is a bug in bash_completion, as fixing this
>>> is rather complex
>>
>> Didn`t work for me. dd if=<tab> shows me the content of the actual
>> directory. If i now type /ho<tab> "dd if=/ho<tab>" the string if=/ho
>> will be displaced to "dd /home".
>
> Ah, well obviously it's more complicated than I though.
>
> The point is, that the COMP_WORDBREAKS setting, is splitting "if="
> into "if" and "=", which doesn't match the case statement.
>
> If we want to fix this just for dd, we need to match the "=" and then
> get the previous word in COMP_WORDS
>   prev="${COMP_WORDS[$(($COMP_CWORD -1))]}"
>
> Aaaaand... that doesn't work. I dunno, this is confusing, but the
> point is, it's splitting on the "if=" and thus can never complete as
> is

And this appears to be fixed in git

http://code.phraktured.net/cgit.cgi/bash-completion/commit/?id=f733e71e1f8d63c072a402346d8162f9c6b63ae2
http://code.phraktured.net/cgit.cgi/bash-completion/commit/?id=f871fe4101ed89cb98e201aed8c975fd3061905b