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## compare_shells: bash
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## oils_failures_allowed: 2
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#
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# This idiom discussed on
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# https://github.com/NixOS/nixpkgs/pull/147629
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show() {
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echo show
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# These are actually different
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argv.py ${!hooksSlice}
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argv.py ${!hooksSlice+"${!hooksSlice}"}
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}
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hooksSlice='preHooks[@]'
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preHooks=()
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show
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preHooks=('foo bar' baz)
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show
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# WTF this exposes a difference? But not the test case below?
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# What's happening here?
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# Uncomment this and get an error in bash about hookSlice, even though we never
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# undefined it.
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#wtf=1
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#
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# line 6: !hooksSlice: unbound variable
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if test -n "$wtf"; then
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# 4.4.0(1)-release
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# echo $BASH_VERSION
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set -u
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preHooks=()
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show
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preHooks=('foo bar' baz)
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show
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fi
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## STDOUT:
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show
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[]
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[]
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show
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['foo', 'bar', 'baz']
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['foo bar', 'baz']
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## END
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show() {
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echo show
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# bash gives an error here - !hookSlice unbound, even though preHooks exists
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# OSH currently does the "logical" thing
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argv.py ${!hooksSlice}
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argv.py ${!hooksSlice+"${!hooksSlice}"}
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}
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hooksSlice='preHooks[@]'
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set -u
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preHooks=()
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show
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preHooks=('foo bar' baz)
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show
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## STDOUT:
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show
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## END
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## status: 1
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set -u
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shopt -s eval_unsafe_arith || true 2>/dev/null
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#preHooks=()
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hookSlice="preHooks[@]"
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argv.py ${!hookSlice+"${!hookSlice}"}
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for element in ${!hookSlice+"${!hookSlice}"}; do
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echo $element
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done
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## STDOUT:
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[]
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## END
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hookSlice='preHooks'
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argv.py ${!hookSlice}
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set -u
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argv.py ${!hookSlice}
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echo end
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## status: 1
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## STDOUT:
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[]
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## END
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orig() {
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export NIX_LDFLAGS${role_post}+=" -L$1/lib64"
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}
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new() {
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local var_name="NIX_LDFLAGS$role_post"
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local value=" -L$1/lib64"
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eval "$var_name"+='$value'
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export "$var_name"
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}
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role_post='_foo'
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# set -u
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if test -n "${BASH_VERSION:-}"; then
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orig one
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fi
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declare -p NIX_LDFLAGS_foo # inspect it
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unset NIX_LDFLAGS_foo
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new one
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declare -p NIX_LDFLAGS_foo # inspect it
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## STDOUT:
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declare -x NIX_LDFLAGS_foo=" -Lone/lib64"
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declare -x NIX_LDFLAGS_foo=" -Lone/lib64"
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## END
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## OK osh STDOUT:
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declare -x NIX_LDFLAGS_foo=' -Lone/lib64'
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## END
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