Minimal fish prompt for VSCode

fish_prompt.fish

function fish_prompt
    if not set -q VSCODE_WS; or test $VSCODE_WS = '${workspaceFolder}'
        # not vscode or no active workspace
        set shortpath (prompt_pwd)
    else
        set shortpath (realpath --relative-to $VSCODE_WS .)
        if test (string sub --length 2 $shortpath) = ".."
            # working dir is outside of workspace
            set shortpath (printf "🌍 %s" (prompt_pwd))
        else if test $shortpath = '.'
            # working dir is the workspace root
            set shortpath '🏠'
        else
            # working dir is within the workspace
            set shortpath "🏠/$shortpath"
        end
    end

    printf '%s ❯ ' $shortpath
end