shell.nix

{ config, pkgs, ... }:

{
  # Show git info in bash prompt and display a colorful hostname if using ssh.
  programs.bash.promptInit = ''
    export _JAVA_AWT_WM_NONREPARENTING=1  
    export GIT_PS1_SHOWDIRTYSTATE=1

    source ${pkgs.gitAndTools.gitFull}/share/git/contrib/completion/git-prompt.sh
    __prompt_color="1;33m"
    # Alternate color for hostname if the generated color clashes with prompt color
    __alternate_color="1;33m"
    __hostnamecolor="$__prompt_color"
    # If logged in with ssh, pick a color derived from hostname
    if [ -n "$SSH_CLIENT" ]; then
      __hostnamecolor="1;$(${pkgs.nettools}/bin/hostname | od | tr ' ' '\n' | ${pkgs.gawk}/bin/awk '{total = total + $1}END{print 30 + (total % 6)}')m"
      # Fixup color clash
      if [ "$__hostnamecolor" = "$__prompt_color" ]; then
        __hostnamecolor="$__alternate_color"
      fi
    fi
    __red="1;31m"
    PS1='\n$(ret=$?; test $ret -ne 0 && printf "\[\e[$__red\]$ret\[\e[0m\] ")\[\e[$__prompt_color\]\u@\[\e[$__hostnamecolor\]\h \[\e[$__prompt_color\]\w$(__git_ps1 " [git:%s]")\[\e[0m\]\n$ '
  '';

  programs.bash.enableCompletion = true;
  programs.bash.interactiveShellInit = ''
    [[ -s "$HOME/.dircolors" ]] && eval `${pkgs.coreutils}/bin/dircolors $HOME/.dircolors`
  '';
  environment.homeBinInPath = true;
}