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problem redeclaring path variable (ksh incompatibility)
- X-seq: zsh-workers 20995
- From: Michael Wardle <michael@xxxxxxxxxxxxxx>
- To: zsh-workers@xxxxxxxxxx
- Subject: problem redeclaring path variable (ksh incompatibility)
- Date: Fri, 18 Mar 2005 01:31:38 +1100
- Mailing-list: contact zsh-workers-help@xxxxxxxxxx; run by ezmlm
Hi
I have a script that uses the identifier "path" local to a function. It
works as intended in bash and all the versions of ksh I've tried it on,
but not in zsh, which gives an error message similar to this:
addpath:typeset:6: path: can't assign initial value for array
It turns out that neither "typeset path=" nor "typeset path=value"
create a local scalar, which doesn't meet my expectations. Strangely,
however, "typeset path" does.
It also came as a bit of a surprise to me that "path" should be declared
at all when zsh is emulating sh or ksh, but I don't see a good reason to
remove that.
A test case follows in case you will consider investigating this problem
and modifying zsh to act as bash does:
----------
#!/bin/zsh -p
# test case for zsh dynamic scoping of "path" variable
# Michael Wardle <michael@xxxxxxxxxxxxxx>
# invoked using -p to ignore user rc files
[ -n "$ZSH_VERSION" ] && emulate ksh # arrays are 0 indexed, etc.
set -e # exit on error
func()
{
# create a dynamically scoped variable in function scope
# the identifier exists at global scope as an array but is
# redeclared here as a scalar
#typeset path # this works
typeset path="local0" # this doesn't work
path="local0"
path="$path local1"
echo "Inside function, values are:"
set -- $path
for elem
do
echo "$elem"
done
}
# create a dynamically scoped variable in global scope
typeset -a path
#export path # path being exported doesn't matter
path[0]=global0
path[1]=global1
# display the globally scoped values
echo "Outside function, values are:"
set -- ${path[@]}
for elem
do
echo "$elem"
done
func
# test that the globally scoped values are restored
echo "Outside function, values are:"
set -- ${path[@]}
for elem
do
echo "$elem"
done
----------
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