Re: random once but not twice

[Mikael Magnusson <mikachu@gmail.com>]

On Sat, Nov 11, 2017 at 7:57 PM, Emanuel Berg <moasen@zoho.com> wrote:
> Just wrote this. Strange thing is, random-video
> gives me randomized files, but not
> play-random-video, which is just an interface -
> or that the intention, at least :)
>
> Can anyone figure out what is going on?
>
> All other suggestions how to improve the code,
> both style and function, is appreciated, as
> always...
>
> random-video () {
>     local vid_dir=${1:-.}
>     local ext=${2:-mkv}
>
>     local vid
>     local -a vids
>     local num_vids
>     local vid_num
>
>     vids=("${(@f)$(ls ${vid_dir}/*.${ext})}")
>     num_vids=${#vids}
>
>     vid_num=$(( RANDOM % $num_vids + 1 ))
>     vid=$vids[$vid_num]
>
>     echo $vid
> }
> alias rv=random-video
>
> play-random-video () {
>     local vid_dir=${1:-/mnt-disk/mm/survivor/au/04}
>     local vid
>     vid=$(random-video $vid_dir)
>     echo "playing $vid"
>     # pl $vid # local function to omx player
> }
> alias prv=play-random-video

The subshell in the second function ensures that the RANDOM state in
the parent shell stays the same.

-- 
Mikael Magnusson