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Re: ksX-Mailer: MH-E 8.6; GNU Mailutils 3.2; GNU Emacs 24.5.1
- X-seq: zsh-users 22879
- From: Phil Pennock <zsh-workers+phil.pennock@xxxxxxxxxxxx>
- To: jdh <dhenman@xxxxxxxxx>
- Subject: Re: ksX-Mailer: MH-E 8.6; GNU Mailutils 3.2; GNU Emacs 24.5.1
- Date: Sat, 9 Sep 2017 21:51:41 -0400
- Cc: zsh-users@xxxxxxx
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On 2017-09-09 at 17:00 +1700, jdh wrote:
> I wanted to use the array flage (i) to get an index into a charagcter array (a string), but am getting incorrect results. Here is an example code snippet which shows the oddity.
>
> #
> # below define a table (string) with 4 characters.
> chrtab="#()*"
> for (( ndx=1; ndx<=$#chrtab ; ndx++ ))
> do echo "Character is $chrtab[ndx], but retrieved index is $chrtab[(i)$chrtab[ndx]]"
> done
>
> I expect the result to be 1, 2, 3, 4
> but get 5, 5, 5, 1
>
> Is this a a feature or a bug?
Both, I think?
The `i` is documented to return one past the length of the item, so `5`
means "not found". You can use `I` and see `0` instead.
It's because those are pattern characters, thus the `*` matching the
first item and returning `1`. So I'd _expect_ that using the `e` flag
too would resolve it, but it only fixes two of those.
for (( ndx=1; ndx<=$#chrtab ; ndx++ )); do
echo "Character is $chrtab[ndx], but retrieved index is $chrtab[(ie)$chrtab[ndx]]"
done
Result: 5, 5, 3, 4
What works instead is to backslash-escape the metacharacters:
for (( ndx=1; ndx<=$#chrtab ; ndx++ )); do
echo "Character is $chrtab[ndx], but retrieved index is $chrtab[(i)${(q)chrtab[ndx]}]"
done
Result: 1, 2, 3, 4
I'm not off-hand seeing why `(ie)` indexing wouldn't handle the `#` and
`(` entries though, which is why I think perhaps a bug. But I'm
probably wrong and I too would be interested in learning why this is
expected behavior. :)
-Phil
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