how to revert tab completion order in _arguments or _describe

how to revert tab completion order in _arguments or _describe

[Paul Seyfert]

Hi,

I wrote a small tab completion function
(https://github.com/pseyfert/lb-zsh/blob/master/_lb-run) to complete the
command
```
lb-run Bender <some_version_number> <some executable command>
```

I defined this with
```
_arguments '-l[list versions]' '1:project:($projects)' '2:version:->listversions' '3:command:->runnablestuff'
case $state in
  (runnablestuff)
    ### essentially _command_names -e
  (listversions)
    local -a versionlist
    # lb-dev -l querries for existing version numbers
    versionlist=($(lb-dev -l $line[1] | sed "s/ .*//" ))
    # versionlist is now a list of existing version numbers
    _describe 'project versions' versionlist
    ;;
esac
```

It reasonably works:
```
pseyfert@computer ~ > lb-run Bender v2<tab>
project versions:
v25r5p1  v25r7p3  v26r0    v26r2p1  v26r3p1  v27r0p1
v25r7p2  v25r7p4  v26r1    v26r3    v27r0    v28r0
```

One drawback though is that I'm usually most interested in the latest
version number but the menu completion starts with the oldest version
number (i think it's alphabetically ordered). Is there a way to tell the
_describe in the (listversions) state to cycle through the options in a
specific order? (actually i'm not bound to stick to _describe there, any
other function would be fine, too)

Thanks in advance,

Paul

Re: how to revert tab completion order in _arguments or _describe

[Paul Seyfert]

On 30.04.2016 02:46, Daniel Shahaf wrote:
> Paul Seyfert wrote on Fri, Apr 29, 2016 at 16:55:57 +0200:
>> One drawback though is that I'm usually most interested in the latest
>> version number but the menu completion starts with the oldest version
>> number (i think it's alphabetically ordered). Is there a way to tell the
>> _describe in the (listversions) state to cycle through the options in a
>> specific order? (actually i'm not bound to stick to _describe there, any
>> other function would be fine, too)
> 
> Yes.  The option to show completions in the order given is either -J or
> -V (I don't remember which); both of them are documented under the
> 'compadd' builtin.
> 

Thanks for the pointer,
-V keeps the original order (and then I realised that the original list
wasn't fully sorted so I added a `sort -r` to the pipe)
https://github.com/pseyfert/lb-zsh/commit/8e77312b6e69eb53acf4d6035a77e3ef3420f38b

Re: how to revert tab completion order in _arguments or _describe

[Daniel Shahaf]

Paul Seyfert wrote on Fri, Apr 29, 2016 at 16:55:57 +0200:
> One drawback though is that I'm usually most interested in the latest
> version number but the menu completion starts with the oldest version
> number (i think it's alphabetically ordered). Is there a way to tell the
> _describe in the (listversions) state to cycle through the options in a
> specific order? (actually i'm not bound to stick to _describe there, any
> other function would be fine, too)

Yes.  The option to show completions in the order given is either -J or
-V (I don't remember which); both of them are documented under the
'compadd' builtin.