Change git user automatically depending on directory

.gitconfig

[alias]
  # Manage git user identities
  work = "!f() { git config --local user.email \"my-work@email.com\"; }; f"
  personal = "!f() { git config --local user.email \"my-personal@email.com\"; }; f"
  whoami = !sh -c 'echo \"$(git config --get user.name) <$(git config --get user.email)>\"'

__change_git_user.fish

function __change_git_user -v PWD -d "Change git user depending on directory"
    status --is-command-substitution; and return
    if git rev-parse --is-inside-work-tree > /dev/null ^ /dev/null
        switch $PWD
        case "*work*"
            git work
        case "*"
            git personal
        end
    end
end