random choice makes a lot of this very easy.
the one thing really missing is proper format strings - currently if you do MOMMYS_ROLE believes in you, and you replace "MOMMYS_ROLE" and then send it off to printf... well, what if MOMMYS_ROLE contains a format character?
Or what if "MOMMYS_ROLE" contains the string "AFFECTIONATE_TERM" and then we insert the AFFECTIONATE_TERM after?
At one point I considered writing a string format subcommand to avoid all that, but tbh I've decided that mommy-based format string injection isn't a huge vulnerability at this time.
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Another fish feature I keep thinking about which would be useful for this: set --default.
Basically instead of introducing that weird ${foo:-bar} syntax that the posix heads have, set a variable and use a value only if it hasn't been set yet:
set --default --local MOMMYS_PRONOUNS her their
which sets $MOMMYS_PRONOUNS as a local variable (in any case), and uses the values "her" and "their" if it didn't exist yet. So you guarantee a local variable, but keep the values you want.
That's useful for customization, otherwise you end up doing set -l pronouns her; if set -q MOMMYS_PRONOUNS; set pronouns $MOMMYS_PRONOUNS; end which gets old fast if you have 5 config variables to set.
Or maybe I'm just too fish-brained?
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