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# This file builds an Emacs pre-configured with the packages I need
# and my personal Emacs configuration.
#
# On NixOS machines, this Emacs currently does not support
# Imagemagick, see https://github.com/NixOS/nixpkgs/issues/70631.
#
# Forcing Emacs to link against Imagemagick currently causes libvterm
# to segfault, which is a lot less desirable than not having telega
# render images correctly.
{ lib, pkgs, ... }:

pkgs.makeOverridable({ emacs ? pkgs.emacsGcc }:
let
  emacsWithPackages = (pkgs.emacsPackagesGen emacs).emacsWithPackages;

  # If switching telega versions, use this variable because it will
  # keep the version check, binary path and so on in sync.
  currentTelega = epkgs: epkgs.melpaPackages.telega;

  # $PATH for binaries that need to be available to Emacs
  emacsBinPath = lib.makeBinPath [ (currentTelega pkgs.emacsPackages) ];

  identity = x: x;

  tazjinsEmacs = pkgfun: (emacsWithPackages(epkgs: pkgfun(with epkgs; [
    ace-link
    ace-window
    avy
    bazel
    browse-kill-ring
    cargo
    clojure-mode
    cmake-mode
    company
    counsel
    counsel-notmuch
    d-mode
    direnv
    dockerfile-mode
    eglot
    elfeed
    elixir-mode
    elm-mode
    erlang
    exwm
    flymake
    go-mode
    google-c-style
    gruber-darker-theme
    haskell-mode
    ht
    hydra
    idle-highlight-mode
    ivy
    ivy-prescient
    jq-mode
    kotlin-mode
    lsp-mode
    magit
    markdown-toc
    meson-mode
    multi-term
    multiple-cursors
    nginx-mode
    nix-mode
    notmuch
    paredit
    password-store
    pinentry
    polymode
    prescient
    protobuf-mode
    rainbow-delimiters
    rainbow-mode
    refine
    request
    restclient
    rust-mode
    sly
    string-edit
    swiper
    telephone-line
    terraform-mode
    toml-mode
    transient
    undo-tree
    use-package
    uuidgen
    vterm
    web-mode
    websocket
    which-key
    xelb
    yaml-mode
    yasnippet

    # Wonky stuff
    (currentTelega epkgs)

    # Custom depot packages (either ours, or overridden ones)
    tvlPackages.dottime
    tvlPackages.nix-util
    tvlPackages.passively
    tvlPackages.rcirc
    tvlPackages.term-switcher
    tvlPackages.tvl
  ])));
in lib.fix(self: l: f: pkgs.writeShellScriptBin "tazjins-emacs" ''
  export PATH="${emacsBinPath}:$PATH"
  exec ${tazjinsEmacs f}/bin/emacs \
    --debug-init \
    --no-site-file \
    --no-site-lisp \
    --no-init-file \
    --directory ${./config} ${if l != null then "--directory ${l}" else ""} \
    --eval "(require 'init)" $@
  '' // {
    # Call overrideEmacs with a function (pkgs -> pkgs) to modify the
    # packages that should be included in this Emacs distribution.
    overrideEmacs = f': self l f';

    # Call withLocalConfig with the path to a *folder* containing a
    # `local.el` which provides local system configuration.
    withLocalConfig = confDir: self confDir f;

    # Build a derivation that uses the specified local Emacs (i.e.
    # built outside of Nix) instead
    withLocalEmacs = emacsBin: pkgs.writeShellScriptBin "tazjins-emacs" ''
      export PATH="${emacsBinPath}:$PATH"
      export EMACSLOADPATH="${(tazjinsEmacs f).deps}/share/emacs/site-lisp:"
      exec ${emacsBin} \
        --debug-init \
        --no-site-file \
        --no-site-lisp \
        --no-init-file \
        --directory ${./config} \
        ${if l != null then "--directory ${l}" else ""} \
        --eval "(require 'init)" $@
    '';
  }) null identity
) {}