[OpenWrt-Devel] Question regarding call python script

[Karl Palsson]

Bastian Bittorf <bittorf at bluebottle.com> wrote:
> * Paul Fertser <fercerpav at gmail.com> [11.03.2016 11:15]:
> > As a sidenote, POSIX shell doesn't support associative arrays (which
> > were mentioned in this thread), so it's probably worth clarifying
> > whether it's ok to require bash >= 4 for OpenWrt build scripts or not.
> 
> yes, POSIX is "missing" some goodies of a full bash but:
> 
> "Stick to portable constructs where possible, and
>  you will make somebody's life easier in the future.
>  Maybe your own."
> 
> For all things you can use a workaround.
> So, if you need an array e.g.
> 
> foo[7]=bar
> 
> for e.g. easy iterating over it? use e.g. this approach:
> 
> array_put()
> {
> 	local message="$1"
> 	local dim1="$2"
> 	local dim2="$3"
> 
> 	eval ${ARRAYNAME:-default}_${dim1}_${dim2}='$message'
> }
> 
> array_get()
> {
> 	local dim1="$1"
> 	local dim2="$2"
> 	local var
> 
> 	eval var="\"\${${ARRAYNAME:-default}_${dim1}_${dim2}:-unset}\""
> 	echo "$var"
> }
> 
> array_set "test" 7
> array_get 7
> 
> or for 2-dimensional arrays:
> array_set "2dim" 3 14
> array_get 3 14
> 
> you can simplify this by removing dim2 and ARRAYNAME if this is
> too much.

You know, this is _exactly_ why people want to use python or even
perl instead of bash/awk/sed.

This is a great, wonderful solution if you _must_ use posix
shell. But do we?

Cheers,
Karl P
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