FROM nixos/nix

RUN nix-channel --add https://nixos.org/channels/nixpkgs-unstable nixpkgs
RUN nix-channel --update
RUN nix-env -i bash

RUN wget https://github.com/nix-community/emacs-overlay/archive/master.tar.gz \
  && tar xf master.tar.gz

WORKDIR /emacs-overlay-master

RUN echo -e "{ pkgs ? (import <nixpkgs> { overlays = [ (import ./.) ]; }) }:\n\n\
  let\n\
    emacsWithPackages = (pkgs.emacsPackagesFor pkgs.emacsGit-nox).emacsWithPackages;\n\
  in\n\
    emacsWithPackages (epkgs: (with epkgs.elpaPackages; [ counsel ]))\n\
" >> emacs.nix

RUN nix-build ./emacs.nix

RUN echo -e "\
  export EMACS=$(awk '/exec/ {print $2}' result/bin/emacs)\n\
  export EMACSCLIENT=$(awk '/exec/ {print $2}' result/bin/emacsclient)\n\
  export ELPA=$(awk -F= '/export emacsWithPackages_siteLisp=/ {print $2}' result/bin/emacs)/elpa\n\
" >> .env

RUN source .env && echo -e "\
  export IVY=$(find $ELPA -type d -name ivy*)\n\
  export COUNSEL=$(find $ELPA -type d -name counsel*)\n\
  export SWIPER=$(find $ELPA -type d -name swiper*)\n\
  export LISPPATH=$(realpath $(dirname $EMACS)/../share/emacs/28.0.50/lisp)\n\
  export BINPATH=$(dirname $EMACS)\n\
" >> .env

RUN echo -e "\
  source .env\n\
  export PATH=\$BINPATH\n\
  export EMACSLOADPATH=\$LISPPATH:\$IVY:\$COUNSEL:\$SWIPER\n\
  unset EMACS EMACSCLIENT ELPA IVY COUNSEL SWIPER LISPPATH BINPATH\n\
  export ALTERNATE_EDITOR=\n\
  export TERM=xterm\n\
  emacs --version\n\
  emacs -Q --bg-daemon --eval \"(prog1 'counsel (require 'counsel))\"\n\
  emacsclient -t --eval \"(progn (save-buffers-kill-emacs))\"\n\
" >> emacs.sh

RUN chmod 755 emacs.sh

ENTRYPOINT bash -c "exec -c /emacs-overlay-master/emacs.sh"