Fish function option/param parser

Question

It seems that there is some work in progress to add support for this in the future:

https://github.com/fish-shell/fish-shell/issues/478
https://github.com/xiaq/fish-shell/tree/opt-parse

But in the meantime, what's the recommended way to deal with this? Should I just parse $argv? If so do you have some tips/best practices?

Answer 1

I'm note sure if it is a best practice, but in the meantime you could do something like this:

function options
  echo $argv | sed 's|--*|\\'\n'|g' | grep -v '^$'
end

function function_with_options
  for i in (options $argv)
    echo $i | read -l option value

    switch $option
      case a all
        echo all the things
      case f force
        echo force it
      case i ignore
        echo ignore the $value
    end
  end
end

Output:

➤ function_with_options -i thing -a --force
ignore the thing
all the things
force it