Fish shell automatic directory specific functions

Question

Is it possible to have fish automatically load additional configurations based on the directory you are in? A possible example, but obviously this doesn't work. You navigate to a project folder:

cd ~/my_proj

There is a file in that folder called .fish.config that contains a special fish function that is now accessible (since we are in my_proj).

Is there any built-in mechanism in fish that allows the loading from some fish config file when navigating to a directory (similar to above)?

Answer 1

Take a look at the --on-variable flag for the function statement. You can define a function like this that runs whenever the PWD changes:

function react_to_pwd --on-variable PWD
   echo Reacting to PWD changing to $PWD
end

Answer 2

There is some pre-existing work in this area:

• direnv
• autoenv-fish
• Automatically set environment variables based on working directory