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+# This file builds an Emacs pre-configured with the packages I need
+# and my personal Emacs configuration.
+{ depot, lib, pkgs, ... }:
+
+pkgs.makeOverridable
+  ({ emacs ? pkgs.emacs29 }:
+  let
+    emacsPackages = (pkgs.emacsPackagesFor emacs);
+    emacsWithPackages = emacsPackages.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)
+      pkgs.libwebp # for dwebp, required by telega
+    ];
+
+    identity = x: x;
+
+    # tree-sitter grammars for various ts-modes
+    customTreesitGrammars = emacs.pkgs.treesit-grammars.with-grammars (g: with g; [
+      tree-sitter-bash
+      tree-sitter-c
+      tree-sitter-cmake
+      tree-sitter-cpp
+      tree-sitter-css
+      tree-sitter-dockerfile
+      tree-sitter-go
+      tree-sitter-gomod
+      tree-sitter-hcl
+      tree-sitter-html
+      tree-sitter-java
+      tree-sitter-json
+      tree-sitter-latex
+      tree-sitter-make
+      tree-sitter-nix
+      tree-sitter-python
+      tree-sitter-rust
+      tree-sitter-sql
+      tree-sitter-toml
+      tree-sitter-yaml
+    ]);
+
+    tazjinsEmacs = pkgfun: (emacsWithPackages (epkgs: pkgfun (with epkgs; [
+      ace-link
+      ace-window
+      avy
+      bazel
+      browse-kill-ring
+      cargo
+      clojure-mode
+      consult
+      deft
+      direnv
+      elixir-mode
+      elm-mode
+      erlang
+      depotExwm
+      go-mode
+      google-c-style
+      gruber-darker-theme
+      haskell-mode
+      ht
+      hydra
+      idle-highlight-mode
+      inspector
+      jq-mode
+      kotlin-mode
+      kubernetes
+      magit
+      markdown-toc
+      multiple-cursors
+      nginx-mode
+      nix-mode
+      notmuch
+      paredit
+      password-store
+      pinentry
+      prescient
+      protobuf-mode
+      rainbow-delimiters
+      rainbow-mode
+      request
+      restclient
+      rust-mode
+      sly
+      string-edit-at-point
+      terraform-mode
+      undo-tree
+      uuidgen
+      vertico
+      vterm
+      web-mode
+      websocket
+      which-key
+      xelb
+      yasnippet
+      zetteldeft
+      zoxide
+
+      # experimental (not otherwise embedded in config yet)
+      orderless
+      corfu
+      eat
+
+      # Wonky stuff
+      (currentTelega epkgs)
+      customTreesitGrammars # TODO(tazjin): how is this *supposed* to work?!
+
+      # Custom depot packages (either ours, or overridden ones)
+      tvlPackages.dottime
+      tvlPackages.nix-util
+      tvlPackages.passively
+      tvlPackages.rcirc
+      tvlPackages.term-switcher
+      tvlPackages.tvl
+
+      # Dynamic/native modules
+      depot.users.tazjin.gio-list-apps
+    ])));
+
+    # Tired of telega.el runtime breakages through tdlib
+    # incompatibility. Target to make that a build failure instead.
+    tdlibCheck =
+      let
+        tgEmacs = emacsWithPackages (epkgs: [ (currentTelega epkgs) ]);
+        verifyTdlibVersion = builtins.toFile "verify-tdlib-version.el" ''
+          (require 'telega)
+          (defvar tdlib-version "${pkgs.tdlib.version}")
+          (when (or (version< tdlib-version
+                              telega-tdlib-min-version)
+                    (and telega-tdlib-max-version
+                          (version< telega-tdlib-max-version
+                                    tdlib-version)))
+             (message "Found TDLib version %s, but require %s to %s"
+                     tdlib-version telega-tdlib-min-version telega-tdlib-max-version)
+            (kill-emacs 1))
+        '';
+      in
+      pkgs.runCommand "tdlibCheck" { } ''
+        export PATH="${emacsBinPath}:$PATH"
+        ${tgEmacs}/bin/emacs --script ${verifyTdlibVersion} && touch $out
+      '';
+  in
+  lib.fix
+    (self: l: f: (pkgs.writeShellScriptBin "tazjins-emacs" ''
+      export PATH="${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 ${l}" else ""} \
+        --eval "(add-to-list 'treesit-extra-load-path \"${customTreesitGrammars}/lib\")" \
+        --eval "(require 'init)" $@
+    '').overrideAttrs
+      (_: {
+        passthru = {
+          # Expose original Emacs used for my configuration.
+          inherit emacs;
+
+          # Expose the pure emacs with all packages.
+          inherit emacsPackages;
+          emacsWithPackages = tazjinsEmacs f;
+
+          # 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;
+
+          # Expose telega/tdlib version check as a target that is built in
+          # CI.
+          #
+          # TODO(tazjin): uncomment when telega works again
+          inherit tdlibCheck;
+          meta.ci.targets = [ "tdlibCheck" ];
+        };
+      }))
+    null
+    identity
+  )
+{ }