You might not need Bass for simple use cases. A great simple alternative (suggested by @jorgebucaran) is to just use exec bash -c "source some-bash-setup.sh; exec fish".
it's the only caveat I can find about fish, it's not POSIX compliant.
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Nice! take a look at this: github.com/edc/bass (for bash scripts).
it's the only caveat I can find about fish, it's not POSIX compliant.