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{ config, pkgs, lib, ... }:

let
  pkgsUnstable = if pkgs.stdenv.isDarwin then import <nixpkgs-unstable> {} else import <nixos-unstable> {};
  emacsPackage = import ../packages/emacs.nix {
    pkgs = pkgs.unstable;
    emacs = pkgs.unstable.emacs;
  };

  editorScript = pkgs.writeScriptBin "edit" ''
    #!${pkgs.runtimeShell}
    if [ -z "$1" ]; then
      exec ${emacsPackage}/bin/emacsclient --create-frame --alternate-editor ${emacsPackage}/bin/emacs
    else
      exec ${emacsPackage}/bin/emacsclient --alternate-editor ${emacsPackage}/bin/emacs "$@"
    fi
  '';
  desktopApplicationFile = pkgs.writeTextFile {
    name = "emacsclient.desktop";
    destination = "/share/applications/emacsclient.desktop";
    text = ''
      [Desktop Entry]
      Name=Emacsclient
      GenericName=Text Editor
      Comment=Edit text
      MimeType=text/english;text/plain;text/x-makefile;text/x-c++hdr;text/x-c++src;text/x-chdr;text/x-csrc;text/x-java;text/x-moc;text/x-pascal;text/x-tcl;text/x-tex;application/x-shellscript;text/x-c;text/x-c++;
      Exec=${editorScript}/bin/edit %F
      Icon=emacs
      Type=Application
      Terminal=false
      Categories=Development;TextEditor;
      StartupWMClass=Emacs
      Keywords=Text;Editor;
    '';
  };
in
{
  home.packages = [
    emacsPackage
    editorScript
  ];
  nixpkgs.config.packageOverrides = {
    myEmacs = emacsPackage;
  };
  home.sessionVariables = {
    EDITOR = "${editorScript}/bin/edit";
  };
  home.file.".emacs.d" = {
    recursive = true;
    source = ../emacs/.emacs.d;
  };
  home.file.".local/share/applications/emacsclient.desktop".source = desktopApplicationFile;
}