# Fg42 - Emacs Editor for advance users
#
# Copyright (c) 2010-2024 Sameer Rahmani <lxsameer@gnu.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 2.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
{
  stdenv,
  elispPkgs,
  srcDir,
  emacsPackagesFor,
  emacsPackages,
  ourPackages,
  writeScriptBin,
  symlinkJoin,
  # This is a set of system tools required for FG42
  # to work.
  emacs,
  ripgrep,
  git,
  texinfo,
  vazir-fonts,
  fira-code,
  nerdfonts,
}:
with builtins;
let
  getEpkg = epkgs: x:
    if hasAttr x epkgs
    then getAttr x epkgs
    else getAttr x ourPackages;

  epkgSet = emacsPackagesFor emacs;
  #epkgs = (map getEpkg elispPkgs);
  emacsBundle = epkgSet.emacsWithPackages (epkgs:
    (map (getEpkg epkgs) elispPkgs)
  );

in stdenv.mkDerivation (final: rec{
  pname = "fg42";
  version = "4.0.0";

  src = srcDir;
  outputs = [ "out" ];

  buildPhase =  ''
  mkdir -p $out/fg42
  mkdir -p $out/bin/

  cp -rv ${src}/core $out/fg42/
  cp -rv ${src}/share $out/

  runHook preBuild
  cd $out/fg42
  emacs -L . --batch -f batch-byte-compile *.el
  cd -
  cp -v ${src}/fg42-config.el $out/fg42/

  runHook postBuild

  '';

  installPhase = ''
    runHook preInstall

    # LISPDIR=$out/share/emacs/site-lisp
    # install -d $LISPDIR
    # install *.el *.elc $LISPDIR
    emacs --batch -l package --eval "(package-generate-autoloads \"${pname}\" \"$out/fg42\")"

    runHook postInstall
  '';

  propagatedUserEnvPkgs = [
    emacsBundle
    ripgrep
    git
    texinfo
    vazir-fonts
    fira-code
    nerdfonts
  ];
  buildInputs = propagatedUserEnvPkgs;

  emacsInUse = emacsBundle;
})