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Re: Minor bug declaring arrays of integers: dcl -ai=>broken, dcl -ia=>ok


From: Chet Ramey
Subject: Re: Minor bug declaring arrays of integers: dcl -ai=>broken, dcl -ia=>ok
Date: Mon, 22 Jul 2013 09:07:35 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/20130509 Thunderbird/17.0.6

On 7/21/13 10:35 PM, Dan Douglas wrote:

> What's the bug? I can't reproduce this and always get "xx" no mater the 
> option 
> order.
> 
> I always assumed the -i attribute doesn't get set until after assigning the 
> values, which is why:
> 
>      $ ( declare -ia foo=(1 2 xx 3); echo "address@hidden" )
>     1 2 xx 3

The issue is whether or not attributes that determine how the assignment
should be treated (-a/-A) or how the variable should be created (-g) are
handled specially and affect how the value is expanded.  The question
is why -i should be omitted from that list.

There is a fairly powerful argument for backwards compatibility here:
Dan's suggestion of a workaround by quoting the rhs of the assignment
statement is a good one.

The other side of the argument is consistency.  declare -A foo=(whatever)
changes how the array indices are expanded.  Why should -i be different?

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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