os/programs/bash.nix

{config, lib, pkgs, inputs, ...} : {
    programs.bash.enable = true;
    programs.bash.bashrcExtra = ''
    if [ -n "$PS1" ]; then
        NEW_PROMPT_COMMAND='
            MY_PWD="$PWD"
            [[ "$MY_PWD" =~ ^"$HOME"(/|$) ]] && MY_PWD="~''${MY_PWD#$HOME}"
            TRIMMED_PWD=''${MY_PWD: -40};
            TRIMMED_PWD=''${TRIMMED_PWD:-$MY_PWD}
            [[ "''${#MY_PWD}" -ge 41 ]] && TRIMMED_PWD="…$TRIMMED_PWD"

            SHELL_PREFIX=""
            [[ -n "$IN_NIX_SHELL" ]] && SHELL_PREFIX="$SHELL_PREFIX "
            [[ -n "$AWS_VAULT" ]] && SHELL_PREFIX="$SHELL_PREFIX 🔓︎"
            [[ -n "$FLUTTER_ENV" ]] && SHELL_PREFIX="$SHELL_PREFIX ✌︎"
            [[ -n "$REACTNATIVE_ENV" ]] && SHELL_PREFIX="$SHELL_PREFIX ⚛"
        '
        if [ -n "''${PROMPT_COMMAND// /}" ]; then
            PROMPT_COMMAND="$PROMPT_COMMAND
$NEW_PROMPT_COMMAND"
        else
            PROMPT_COMMAND="$NEW_PROMPT_COMMAND"
        fi
        unset NEW_PROMPT_COMMAND

        export PS1="[\t \[\e[32m\]\u\[\e[m\]\[\e[32m\]@\[\e[m\]\[\e[32m\]\h\[\e[m\]]"'$SHELL_PREFIX'" \[\e[36m\]"'$TRIMMED_PWD'"\[\e[m\] \$ "
    fi

    eval "$(direnv hook bash)"
    '';
    programs.bash.shellAliases = {
      chmod = "chmod --preserve-root";
      chown = "chown --preserve-root";
      ls = "ls -Isnap --color";
      df = "df -h -x squashfs -x tmpfs -x devtmpfs -x overlay -x revokefs-fuse";
      free = "free -h";
      toupper = "tr [:lower:] [:upper:]";
      tolower = "tr [:upper:] [:lower:]";
      rebuild = ''
      	nixos-rebuild switch --flake "$HOME/.local/os#" --use-remote-sudo
      '';
      ":r" = "!!";
    };
    programs.bash.sessionVariables = {
      NIX_SHELL_PRESERVE_PROMPT = 1;
      NIXPKGS_ALLOW_UNFREE = 1;
      HISTCONTROL = "ignoreboth:erasedups";
    };
}