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I'm not familiar with zsh, but it seems to me that your problem here is that the syntax for `for` loops is different in bash and zsh, which throws bash off as it tries to interpret your script, finds a keyword it knows but the rest of the statement doesn't match what it expects.

The solution would seem to me to be to put the shell-specific parts in separate files, and only `source` the file matching the current execution environment into the script. So you might have a main script like:

    #!/usr/bin/env bash

    shell=$(ps -p $$ -oargs= | awk '{print $1}')

    if [ $shell = "bash" ]; then
        source ./bash-source.sh
    elif [ $shell = "zsh" ]; then
        source ./zsh-source.sh
    fi

as well as `bash-source.sh`

    for f in ~/.functions.d/*.sh; do source $f; done

and `zsh-source.sh`

    for f (~/.functions.d/**/*.sh) source $f

This way, each shell only sees the `for` statement with the correct syntax for it, and therefore doesn't get tripped up by trying to parse the other. This relies on the fact that at least bash doesn't actually *parse* a file until it's loaded, and loading happens only when the `source` statement is actually *executed*.

If zsh deals gracefully with this situation, you might not need to split the bash source loop into its own file; but clearly bash doesn't like to see the zsh `for` (as evidenced by the fact that you're getting an error relating to it), and thus bash needs a little hand-holding.

Also note that I had to add `| awk '{print $1}'` to the `$shell` assignment. Without it, when within a bash shell script, `$shell` was assigned the whole execution command line; in other words, `bash ./filename.sh` even when executing the script only as `./filename.sh`. There's almost certainly a more efficient way to do that; for the moment, I simply needed something that got me past that assignment and would likely give the intended value. This does however suggest some system-dependence in the `ps` output that you may need to deal with, depending on just how portable you want this script to be.