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Re: language inconsistency(wart) & RFE

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On 10/17/15, Linda Walsh <bash@tlinx.org> wrote:
> Ok, thinking this from a different way.
>
> shopt -s implicit_vars_local
> or
> shopt -s localize_func_implicit_vars.... whatever...
>
> Right now, in a function, you *can* use local in a function
> to make a local var.  Thing is, both 'declare' and 'typeset' also
> make a *local* var in a function, unless the "-g" switch is used.
>
> I.e. All standard, overt ways (local declare typeset) of creating
> a var in a function all result in it being local, BUT,
> (and I think this is an ugly wart),
> any *implicit vars* without local, or the
> misleading declare or typeset, become global.
>
> examples:  In these two for statements, used in functions, 'i'
> becomes global:
>
>   for((i=0; i<10; ++i)); do : done
>   for i in {1..10}; do : done
>
> And same with 'myarray':
>   readarray myarray=$(echo "one";echo "two")
>
> and reads and assignments, and 'lets'
>   read ln < <(echo "one"; echo "two")
>   ln2="one two"
>   read ln3 <<< "one two"
>
> but if this isn't a potential for confusion:
>
>> function aa {
> read ln < <(echo "one"; echo "two")
> ln2="12"
> read ln3 <<< "one two"
> ar1=(one two)
> typeset -i ln2=34
> typeset -a ar1=(three four)
> }
>> whence aa
> aa is a function
> aa ()
> {
>     read ln < <(echo "one"; echo "two");
>     ln2="12";
>     read ln3 <<< "one two";
>     ar1=(one two);
>     typeset -i ln2=34;
>     typeset -a ar1=(three four)
> }
>> aa
>> declare -p ln ln2 ln3 ar1
> declare -- ln="one"
> declare -- ln2="12"
> declare -- ln3="one two"
> declare -a ar1='([0]="one" [1]="two")'
>
> !!!  -- sure looks like I was trying to set the "type" of ln2
> and ar1... boy could that be confusing...
>
> ....
> So, how about a "shopt"
> to declare that **what's implicity declared in funcs, stays in funcs**
> maybe shopt -s vegasvars ?.....
>
> but seriously -- it's so odd that anything you declare explicitly
> becomes local, while implicit vars default to global --
> I know standards and compat must keep it that way... BUT
> it would have made more sense to have
> implicit vars in a function always be 'local'
> and maybe have explicit declarators be global
> (which has effectively been done with -g)...but
> originally, I also thought it strange that 'declare/typeset'
> were equivalent to 'local' inside a function.
>
> This way, you wouldn't have to change any syntax
> parsing functions and there certain isn't ANYTHING
> that would look like perl, even though perl was
> originally designed to be like shell with many shell standard
> functions built-in.
>
> ???
>
>
>

Maybe you can just use this?    alias declare='declare -g'


---
xoxo iza

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Re: language inconsistency(wart) & RFE isabella parakiss <izaberina@gmail.com> - 2015-10-17 07:00 +0200

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