Issue parsing zsh nested expansion.

[kevincox]

root_usage="Size: 222151426, NumBlocks: 20587"
root_usage=${${root_usage##Size: }%,*}
echo $root_usage # Prints 222151426

resholve --overwrite my-script
                                                root_usage=${${root_usage##Size: }%,*}
                                                              ^
my-script:57: error: Expected } to close ${

Note that this syntax isn't supported by bash so that may be why it isn't supported.

$ root_usage=${${root_usage##Size: }%,*}
bash: ${${root_usage##Size: }%,*}: bad substitution

Workaround

eval 'root_usage=${${root_usage##Size: }%,*}'

This just gives a warning.

                                                eval 'root_usage=${${root_usage##Size: }%,*}'
                                                     ^
my-script:57: FEEDBACK WANTED: Letting quoted 'eval' through for now.

[abathur]

You've got the cause right. Thanks for documenting it along with a simple enough workaround.

The osh parser is mostly bash compatible, but there are definitely zshisms that it can't parse. In the longer run I'm open to the idea of trying to abstract oil bits resholve leans on well enough to slot in other parsers, but it'd be a fair amount of work.