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{ config, pkgs, sources, ... }:
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let

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  nurNoPkgs = import (import ../nix/sources.nix).nur { };
  # nurNoPkgs.repos.rycee = import ../../nur-expressions { pkgs = throw "nixpkgs eval"; };
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in

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{
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  imports = [
    nurNoPkgs.repos.rycee.hmModules.emacs-init
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    nurNoPkgs.repos.rycee.hmModules.emacs-notmuch
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  ];

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  nixpkgs.overlays = [
    (import sources.emacs-overlay)
    (self: super: {
      emacs27 = super.emacs27.overrideAttrs (old: {
        patches = old.patches or [] ++ [
          # Fix "Attempt to shape unibyte text" error.
          (pkgs.fetchpatch {
            url = "https://github.com/emacs-mirror/emacs/commit/fe903c5ab7354b97f80ecf1b01ca3ff1027be446.patch";
            sha256 = "0zldjs8nx26x7r8pwjc995lvpg06iv52rq4cy1w38hxhy7vp8lp3";
          })
        ];
      });
    })
  ];
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  programs.emacs.init = {
    enable = true;
    recommendedGcSettings = true;

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    earlyInit = ''
      ;; Disable some GUI distractions. We set these manually to avoid starting
      ;; the corresponding minor modes.
      (push '(menu-bar-lines . 0) default-frame-alist)
      (push '(tool-bar-lines . nil) default-frame-alist)
      (push '(vertical-scroll-bars . nil) default-frame-alist)
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      ;; Set up fonts early.
      (set-face-attribute 'default
                          nil
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                          :height 80
                          :family "Fantasque Sans Mono")
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      (set-face-attribute 'variable-pitch
                          nil
                          :family "DejaVu Sans")
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    '';

    prelude = ''
      ;; Disable startup message.
      (setq inhibit-startup-screen t
            inhibit-startup-echo-area-message (user-login-name))

      (setq initial-major-mode 'fundamental-mode
            initial-scratch-message nil)

      ;; Don't blink the cursor.
      (setq blink-cursor-mode nil)
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      ;; Set frame title.
      (setq frame-title-format
            '("" invocation-name ": "(:eval
                                      (if (buffer-file-name)
                                          (abbreviate-file-name (buffer-file-name))
                                        "%b"))))

      ;; Accept 'y' and 'n' rather than 'yes' and 'no'.
      (defalias 'yes-or-no-p 'y-or-n-p)

      ;; Don't want to move based on visual line.
      (setq line-move-visual nil)

      ;; Stop creating backup and autosave files.
      (setq make-backup-files nil
            auto-save-default nil)

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      ;; Default is 4k, which is too low for LSP.
      (setq read-process-output-max (* 1024 1024))

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      ;; Always show line and column number in the mode line.
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      (line-number-mode)
      (column-number-mode)

      ;; Enable some features that are disabled by default.
      (put 'narrow-to-region 'disabled nil)

      ;; Typically, I only want spaces when pressing the TAB key. I also
      ;; want 4 of them.
      (setq-default indent-tabs-mode nil
                    tab-width 4
                    c-basic-offset 4)

      ;; Trailing white space are banned!
      (setq-default show-trailing-whitespace t)

      ;; Make a reasonable attempt at using one space sentence separation.
      (setq sentence-end "[.?!][]\"')}]*\\($\\|[ \t]\\)[ \t\n]*"
            sentence-end-double-space nil)

      ;; I typically want to use UTF-8.
      (prefer-coding-system 'utf-8)

      ;; Nicer handling of regions.
      (transient-mark-mode 1)

      ;; Make moving cursor past bottom only scroll a single line rather
      ;; than half a page.
      (setq scroll-step 1
            scroll-conservatively 5)

      ;; Enable highlighting of current line.
      (global-hl-line-mode 1)

      ;; Improved handling of clipboard in GNU/Linux and otherwise.
      (setq select-enable-clipboard t
            select-enable-primary t
            save-interprogram-paste-before-kill t)

      ;; Pasting with middle click should insert at point, not where the
      ;; click happened.
      (setq mouse-yank-at-point t)

      ;; Enable a few useful commands that are initially disabled.
      (put 'upcase-region 'disabled nil)
      (put 'downcase-region 'disabled nil)

      (setq custom-file (locate-user-emacs-file "custom.el"))
      (load custom-file)

      ;; When finding file in non-existing directory, offer to create the
      ;; parent directory.
      (defun with-buffer-name-prompt-and-make-subdirs ()
        (let ((parent-directory (file-name-directory buffer-file-name)))
          (when (and (not (file-exists-p parent-directory))
                     (y-or-n-p (format "Directory `%s' does not exist! Create it? " parent-directory)))
            (make-directory parent-directory t))))

      (add-to-list 'find-file-not-found-functions #'with-buffer-name-prompt-and-make-subdirs)

      ;; Don't want to complete .hi files.
      (add-to-list 'completion-ignored-extensions ".hi")

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      (defun rah-disable-trailing-whitespace-mode ()
        (setq show-trailing-whitespace nil))

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      ;; Shouldn't highlight trailing spaces in terminal mode.
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      (add-hook 'term-mode #'rah-disable-trailing-whitespace-mode)
      (add-hook 'term-mode-hook #'rah-disable-trailing-whitespace-mode)
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      (defun rah-prog-mode-setup ()
        ;; Use a bit wider fill column width in programming modes
        ;; since we often work with indentation to start with.
        (setq fill-column 80))

      (add-hook 'prog-mode-hook #'rah-prog-mode-setup)

      (defun rah-sort-lines-ignore-case ()
        (interactive)
        (let ((sort-fold-case t))
          (call-interactively 'sort-lines)))
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    '';

    usePackage = {
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      abbrev = {
        enable = true;
        diminish = [ "abbrev-mode" ];
        command = [ "abbrev-mode" ];
      };

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      adoc-mode = {
        enable = true;
        mode = [
          ''"\\.txt\\'"''
          ''"\\.adoc\\'"''
        ];
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        hook = [''
          (adoc-mode . (lambda ()
                         (visual-line-mode)
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                         (buffer-face-mode)))
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        ''];
        config = ''
          (set-face-background 'markup-verbatim-face nil)
        '';
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      };

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      ansi-color = {
        enable = true;
        command = [ "ansi-color-apply-on-region" ];
      };

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      autorevert = {
        enable = true;
        diminish = [ "auto-revert-mode" ];
        command = [ "auto-revert-mode" ];
      };

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      back-button = {
        enable = true;
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        package = epkgs: epkgs.back-button.overrideAttrs (drv:
          let isNotUcsUtils = p: (builtins.parseDrvName p.name).name != "emacs-ucs-utils";
          in {
            patches = [
              # ucs-utils makes Emacs shutdown very slow, remove its use through this patch.
              (pkgs.fetchpatch {
                name = "remove-ucs-utils.patch";
                url = "https://github.com/rutger-eiq/back-button/commit/164cf6e2a536a8da6e45c0365922ea1887acde79.patch";
                sha256 = "0czii9hdk7l6j3palpb68377phms9jw9ldb51apjhbmscjyr55q3";
              })
            ];

            # Also need to remove ucs-utils from the various build inputs.
            buildInputs = builtins.filter isNotUcsUtils drv.buildInputs;
            propagatedBuildInputs = builtins.filter isNotUcsUtils drv.propagatedBuildInputs;
            propagatedUserEnvPkgs = builtins.filter isNotUcsUtils drv.propagatedUserEnvPkgs;
          });
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        defer = 2;
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        diminish = [ "back-button-mode" ];
        command = [ "back-button-mode" ];
        config = ''
          (back-button-mode 1)

          ;; Make mark ring larger.
          (setq global-mark-ring-max 50)
        '';
      };

      base16-theme = {
        enable = true;
        config = "(load-theme 'base16-tomorrow-night t)";
      };

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      calc = {
        enable = true;
        command = [ "calc" ];
        config = ''
          (setq calc-date-format '(YYYY "-" MM "-" DD " " Www " " hh ":" mm ":" ss))
        '';
      };

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      # From https://github.com/mlb-/emacs.d/blob/a818e80f7790dffa4f6a775987c88691c4113d11/init.el#L472-L482
      compile = {
        enable = true;
        defer = true;
        after = [ "ansi-color" ];
        hook = [
          ''
            (compilation-filter . (lambda ()
                                    (when (eq major-mode 'compilation-mode)
                                      (ansi-color-apply-on-region compilation-filter-start (point-max)))))
          ''
        ];
      };

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      beacon = {
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        enable = false;
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        command = [ "beacon-mode" ];
        diminish = [ "beacon-mode" ];
        defer = 1;
        config = "(beacon-mode 1)";
      };

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      browse-at-remote = {
        command = [ "browse-at-remote" ];
      };

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      cc-mode = {
        enable = true;
        defer = true;
        hook = [
          ''
            (c-mode-common . (lambda ()
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                               (subword-mode)
                               (c-set-offset 'arglist-intro '++)))
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          ''
        ];
      };

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      csharp-mode = {
        mode = [ ''"\\.cs\\'"'' ];
      };

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      deadgrep = {
        enable = true;
        bind = {
          "C-x f" = "deadgrep";
        };
      };

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      direnv = {
        enable = true;
        command = [ "direnv-mode" "direnv-update-environment" ];
      };

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      dhall-mode.enable = true;
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      dockerfile-mode.enable = true;
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      doom-modeline = {
        enable = true;
        hook = [ "(after-init . doom-modeline-mode)" ];
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        config = ''
          (setq doom-modeline-buffer-file-name-style 'truncate-except-project)
        '';
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      };

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      drag-stuff = {
        enable = true;
        bind = {
          "M-<up>" = "drag-stuff-up";
          "M-<down>" = "drag-stuff-down";
        };
      };

      ediff = {
        enable = true;
        defer = true;
        config = ''
          (setq ediff-window-setup-function 'ediff-setup-windows-plain)
        '';
      };

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      eldoc = {
        enable = true;
        diminish = [ "eldoc-mode" ];
        command = [ "eldoc-mode" ];
      };

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      # Enable Electric Indent mode to do automatic indentation on RET.
      electric = {
        enable = true;
        command = [ "electric-indent-local-mode" ];
        hook = [
          "(prog-mode . electric-indent-mode)"

          # Disable for some modes.
          "(nix-mode . (lambda () (electric-indent-local-mode -1)))"
        ];
      };
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      elm-mode.enable = true;
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      etags = {
        enable = true;
        defer = true;
        # Avoid spamming reload requests of TAGS files.
        config = "(setq tags-revert-without-query t)";
      };

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      gcmh = {
        enable = true;
        defer = 1;
        command = [ "gcmh-mode" ];
        config = ''
          (setq gcmh-verbose t)
          (gcmh-mode)
        '';
      };

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      ggtags = {
        enable = true;
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        defer = true;
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        diminish = [ "ggtags-mode" ];
        command = [ "ggtags-mode" ];
      };

      groovy-mode = {
        enable = true;
        mode = [
          ''"\\.gradle\\'"''
          ''"\\.groovy\\'"''
          ''"Jenkinsfile\\'"''
        ];
      };

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      idris-mode = {
        enable = true;
        mode = [ ''"\\.idr\\'"'' ];
      };

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      ispell = {
        enable = true;
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        defer = 1;
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      };

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      js = {
        enable = true;
        mode = [
          ''("\\.js\\'" . js-mode)''
          ''("\\.json\\'" . js-mode)''
        ];
        config = ''
          (setq js-indent-level 2)
        '';
      };

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      # See https://github.com/mickeynp/ligature.el
      ligature = {
        enable = true;
        package = epkgs: epkgs.trivialBuild {
          pname = "ligature.el";
          src = sources."ligature.el";
          preferLocalBuild = true;
          allowSubstitutes = false;
        };
        command = [ "ligature-set-ligatures" ];
        hook = [
          ''(nxml-mode . ligature-mode)''
          ''(prog-mode . ligature-mode)''
        ];
        config = ''
          ;; Prepare Fantasque Sans Mono ligatures in some modes.
          (ligature-set-ligatures 'nxml-mode '("<!--" "-->"))
          (ligature-set-ligatures 'prog-mode '("::" "!=" "!==" "-->" "->" "->>" "-<" "-<<" "//"
                                               "&&" "||" "|>" "==" "===" "==>" "=>" "=>>" "<="
                                               "=<<" "=/=" ">-" ">=" ">=>" ">>" ">>-" ">>="
                                               "<|" "<|>" "<-" "<--" "<->" "<=" "<==" "<=>"
                                               "<=<" "<>" "<<" "<<-" "<<=" "<~" "<~~" "~>"
                                               "~~" "~~>"))
        '';
      };

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      notifications = {
        enable = true;
        command = [ "notifications-notify" ];
      };

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      notmuch = {
        command = [ "notmuch" "notmuch-show-tag" "notmuch-search-tag" ];
        hook = [
          ''(notmuch-show . rah-disable-trailing-whitespace-mode)''
        ];
        bindLocal = {
          notmuch-show-mode-map = {
            "S" = "rah-notmuch-show-tag-spam";
            "d" = "rah-notmuch-show-tag-deleted";
          };
          notmuch-search-mode-map = {
            "S" = "rah-notmuch-search-tag-spam";
            "d" = "rah-notmuch-search-tag-deleted";
          };
        };
        config =
          let
            listTags = ts: "(list ${toString (map (t: ''"${t}"'') ts)})";
            spamTags = listTags ["+spam" "-inbox"];
            deletedTags = listTags ["+deleted" "-inbox"];
          in
            ''
              (defun rah-notmuch-show-tag-spam ()
                (interactive)
                (notmuch-show-tag ${spamTags}))

              (defun rah-notmuch-show-tag-deleted ()
                (interactive)
                (notmuch-show-tag ${deletedTags}))

              (defun rah-notmuch-search-tag-spam (&optional beg end)
                (interactive)
                (notmuch-search-tag ${spamTags} beg end))

              (defun rah-notmuch-search-tag-deleted (&optional beg end)
                (interactive)
                (notmuch-search-tag ${deletedTags} beg end))

              (setq notmuch-show-logo nil)
            '';
      };

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      flyspell = {
        enable = true;
        diminish = [ "flyspell-mode" ];
        command = [ "flyspell-mode" "flyspell-prog-mode" ];
        hook = [
          # Spell check in text and programming mode.
          "(text-mode . flyspell-mode)"
          "(prog-mode . flyspell-prog-mode)"
        ];
        config = ''
          ;; In flyspell I typically do not want meta-tab expansion
          ;; since it often conflicts with the major mode. Also,
          ;; make it a bit less verbose.
          (setq flyspell-issue-message-flag nil
                flyspell-issue-welcome-flag nil
                flyspell-use-meta-tab nil)
        '';
      };

      # Remember where we where in a previously visited file. Built-in.
      saveplace = {
        enable = true;
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        defer = 1;
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        config = ''
          (setq-default save-place t)
          (setq save-place-file (locate-user-emacs-file "places"))
        '';
      };

      # More helpful buffer names. Built-in.
      uniquify = {
        enable = true;
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        defer = 5;
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        config = ''
          (setq uniquify-buffer-name-style 'post-forward)
        '';
      };

      # Hook up hippie expand.
      hippie-exp = {
        enable = true;
        bind = {
          "M-?" = "hippie-expand";
        };
      };

      which-key = {
        enable = true;
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        command = [ "which-key-mode" "which-key-add-major-mode-key-based-replacements" ];
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        diminish = [ "which-key-mode" ];
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        defer = 3;
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        config = "(which-key-mode)";
      };

      # Enable winner mode. This global minor mode allows you to
      # undo/redo changes to the window configuration. Uses the
      # commands C-c <left> and C-c <right>.
      winner = {
        enable = true;
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        defer = 2;
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        config = "(winner-mode 1)";
      };

      writeroom-mode = {
        enable = true;
        command = [ "writeroom-mode" ];
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        bindLocal = {
          writeroom-mode-map = {
            "M-[" = "writeroom-decrease-width";
            "M-]" = "writeroom-increase-width";
            "M-'" = "writeroom-toggle-mode-line";
          };
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        };
        hook = [ "(writeroom-mode . visual-line-mode)" ];
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        config = ''
          (setq writeroom-bottom-divider-width 0)
        '';
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      };

      buffer-move = {
        enable = true;
        bind = {
          "C-S-<up>"    = "buf-move-up";
          "C-S-<down>"  = "buf-move-down";
          "C-S-<left>"  = "buf-move-left";
          "C-S-<right>" = "buf-move-right";
        };
      };

      ivy = {
        enable = true;
        demand = true;
        diminish = [ "ivy-mode" ];
        command = [ "ivy-mode" ];
        config = ''
          (setq ivy-use-virtual-buffers t
                ivy-count-format "%d/%d "
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                ivy-virtual-abbreviate 'full)
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          (ivy-mode 1)
        '';
      };

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      ivy-hydra = {
        enable = true;
        defer = true;
        after = [ "ivy" "hydra" ];
      };

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      ivy-xref = {
        enable = true;
        after = [ "ivy" "xref" ];
        command = [ "ivy-xref-show-xrefs" ];
        config = ''
          (setq xref-show-xrefs-function #'ivy-xref-show-xrefs)
        '';
      };

      swiper = {
        enable = true;
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        command = [ "swiper" "swiper-all" "swiper-isearch" ];
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        bind = {
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          "C-s" = "swiper-isearch";
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        };
      };

      # Lets counsel do prioritization. A fork of smex.
      amx = {
        enable = true;
        command = [ "amx-initialize" ];
      };

      counsel = {
        enable = true;
        bind = {
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          "C-x C-d" = "counsel-dired-jump";
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          "C-x C-f" = "counsel-find-file";
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          "C-x M-f" = "counsel-fzf";
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          "C-x C-r" = "counsel-recentf";
          "C-x C-y" = "counsel-yank-pop";
          "M-x" = "counsel-M-x";
        };
        diminish = [ "counsel-mode" ];
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        config =
          let
            fd = "${pkgs.fd}/bin/fd";
            fzf = "${pkgs.fzf}/bin/fzf";
          in ''
            (setq counsel-fzf-cmd "${fd} --type f | ${fzf} -f \"%s\"")
          '';
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      };

      nyan-mode = {
        enable = true;
        command = [ "nyan-mode" ];
        config = ''
          (setq nyan-wavy-trail t)
        '';
      };

      string-inflection = {
        enable = true;
        bind = {
          "C-c C-u" = "string-inflection-all-cycle";
        };
      };

      # Configure magit, a nice mode for the git SCM.
      magit = {
        enable = true;
        bind = {
          "C-c g" = "magit-status";
        };
        config = ''
          (setq magit-completing-read-function 'ivy-completing-read)
          (add-to-list 'git-commit-style-convention-checks
                       'overlong-summary-line)
        '';
      };

      git-messenger = {
        enable = true;
        bind = {
          "C-x v p" = "git-messenger:popup-message";
        };
      };

      multiple-cursors = {
        enable = true;
        bind = {
          "C-S-c C-S-c" = "mc/edit-lines";
          "C-c m" = "mc/mark-all-like-this";
          "C->" = "mc/mark-next-like-this";
          "C-<" = "mc/mark-previous-like-this";
        };
      };

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      nix-sandbox = {
        enable = true;
        command = [ "nix-current-sandbox" "nix-shell-command" ];
      };

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      avy = {
        enable = true;
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        bind = {
          "M-j" = "avy-goto-word-or-subword-1";
        };
        config = ''
          (setq avy-all-windows t)
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        '';
      };

      undo-tree = {
        enable = true;
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        defer = 1;
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        diminish = [ "undo-tree-mode" ];
        command = [ "global-undo-tree-mode" ];
        config = ''
          (setq undo-tree-visualizer-relative-timestamps t
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                undo-tree-visualizer-timestamps t
                undo-tree-enable-undo-in-region t)
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          (global-undo-tree-mode)
        '';
      };

      # Configure AUCTeX.
      latex = {
        enable = true;
        package = epkgs: epkgs.auctex;
        mode = [ ''("\\.tex\\'" . latex-mode)'' ];
        hook = [
          ''
            (LaTeX-mode
             . (lambda ()
                 (turn-on-reftex)       ; Hook up AUCTeX with RefTeX.
                 (auto-fill-mode)
                 (define-key LaTeX-mode-map [adiaeresis] "\\\"a")))
          ''
        ];
        config = ''
          (setq TeX-PDF-mode t
                TeX-auto-save t
                TeX-parse-self t
                TeX-output-view-style '(("^pdf$" "." "evince %o")
                                        ( "^ps$" "." "evince %o")
                                        ("^dvi$" "." "evince %o")))

          ;; Add Glossaries command. See
          ;; http://tex.stackexchange.com/a/36914
          (eval-after-load "tex"
            '(add-to-list
              'TeX-command-list
              '("Glossaries"
                "makeglossaries %s"
                TeX-run-command
                nil
                t
                :help "Create glossaries file")))
        '';
      };

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      lsp-elm = {
        enable = true;
        defer = true;
        hook = [ "(elm-mode . lsp)" ];
        config = ''
          (setq lsp-elm-elm-language-server-path
                  "${pkgs.elmPackages.elm-language-server}/bin/elm-language-server")
        '';
      };

      lsp-ivy = {
        enable = true;
        after = [ "lsp-mode" ];
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        command = [ "lsp-ivy-workspace-symbol" ];
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      };

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      lsp-haskell = {
        enable = true;
        defer = true;
        hook = [
         ''
           (haskell-mode . (lambda ()
                             (direnv-update-environment)
                             (lsp)))
         ''
        ];
      };

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      lsp-ui = {
        enable = true;
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        command = [ "lsp-ui-mode" ];
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        bindLocal = {
          lsp-mode-map = {
            "C-c r d" = "lsp-ui-doc-glance";
            "C-c f s" = "lsp-ui-find-workspace-symbol";
          };
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        };
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        config = ''
          (setq lsp-ui-sideline-enable t
                lsp-ui-sideline-show-symbol nil
                lsp-ui-sideline-show-hover nil
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                lsp-ui-sideline-show-code-actions nil
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                lsp-ui-sideline-update-mode 'point)
          (setq lsp-ui-doc-enable nil
                lsp-ui-doc-position 'at-point
                lsp-ui-doc-max-width 120
                lsp-ui-doc-max-height 15)
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        '';
      };

      lsp-ui-flycheck = {
        enable = true;
        after = [ "flycheck" "lsp-ui" ];
      };

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      lsp-completion = {
        enable = true;
        after = [ "lsp-mode" ];
        config = ''
          (setq lsp-completion-enable-additional-text-edit nil)
        '';
      };

      lsp-diagnostics = {
        enable = true;
        after = [ "lsp-mode" ];
      };

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      lsp-mode = {
        enable = true;
        command = [ "lsp" ];
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        after = [ "company" "flycheck" ];
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        hook = [ "(lsp-mode . lsp-enable-which-key-integration)" ];
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        bindLocal = {
          lsp-mode-map = {
            "C-c r r" = "lsp-rename";
            "C-c r f" = "lsp-format-buffer";
            "C-c r g" = "lsp-format-region";
            "C-c r a" = "lsp-execute-code-action";
            "C-c f r" = "lsp-find-references";
          };
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        };
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        init = ''
          (setq lsp-keymap-prefix "C-c l")
        '';
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        config = ''
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          (setq lsp-diagnostics-provider :flycheck
                lsp-eldoc-render-all nil
                lsp-modeline-code-actions-enable nil
                lsp-modeline-diagnostics-enable nil
                lsp-modeline-workspace-status-enable nil)
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          (define-key lsp-mode-map (kbd "C-c l") lsp-command-map)
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        '';
      };

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      lsp-modeline = {
        enable = true;
        after = [ "lsp-mode" ];
      };

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      lsp-java = {
        enable = true;
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        defer = true;
        hook = [ "(java-mode . lsp)" ];
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        bindLocal = {
          java-mode-map = {
            "C-c r o" = "lsp-java-organize-imports";
          };
        };
        config = ''
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          (setq lsp-java-save-actions-organize-imports nil
                lsp-java-completion-favorite-static-members
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                    ["org.assertj.core.api.Assertions.*"
                     "org.assertj.core.api.Assumptions.*"
                     "org.hamcrest.Matchers.*"
                     "org.junit.Assert.*"
                     "org.junit.Assume.*"
                     "org.junit.jupiter.api.Assertions.*"
                     "org.junit.jupiter.api.Assumptions.*"
                     "org.junit.jupiter.api.DynamicContainer.*"
                     "org.junit.jupiter.api.DynamicTest.*"
                     "org.mockito.ArgumentMatchers.*"])
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        '';
      };
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      lsp-rust = {
        enable = true;
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        defer = true;
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        hook = [
          ''
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            (rust-mode . (lambda ()
                           (direnv-update-environment)
                           (lsp)))
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          ''
        ];
      };

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      lsp-treemacs = {
        enable = true;
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        after = [ "lsp-mode" ];
        command = [ "lsp-treemacs-errors-list" ];
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      };

      dap-mode = {
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        enable = true;
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        after = [ "lsp-mode" ];
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        command = [ "dap-mode" "dap-auto-configure-mode" ];
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        config = ''
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          (dap-auto-configure-mode)
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        '';
      };

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      dap-mouse = {
        enable = true;
        command = [ "dap-tooltip-mode" ];
      };

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      dap-ui = {
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        enable = true;
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        after = [ "dap-mode" ];
        command = [ "dap-ui-mode" ];
        config = ''
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          (dap-ui-mode t)
        '';
      };

      dap-java = {
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        enable = true;
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        after = [ "dap-mode" "lsp-java" ];
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      };

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      #  Setup RefTeX.
      reftex = {
        enable = true;
        defer = true;
        config = ''
          (setq reftex-default-bibliography '("~/research/bibliographies/main.bib")
                reftex-cite-format 'natbib
                reftex-plug-into-AUCTeX t)
        '';
      };

      haskell-mode = {
        enable = true;
        mode = [
          ''("\\.hs\\'" . haskell-mode)''
          ''("\\.hsc\\'" . haskell-mode)''
          ''("\\.c2hs\\'" . haskell-mode)''
          ''("\\.cpphs\\'" . haskell-mode)''
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          ''("\\.lhs\\'" . haskell-literate-mode)''
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        ];
        hook = [
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          ''(haskell-mode . subword-mode)''
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        ];
        config = ''
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          (setq tab-width 2)
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          (setq haskell-process-log t
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                haskell-notify-p t)

          (setq haskell-process-args-cabal-repl
                '("--ghc-options=+RTS -M500m -RTS -ferror-spans -fshow-loaded-modules"))
        '';
      };

      haskell-cabal = {
        enable = true;
        mode = [ ''("\\.cabal\\'" . haskell-cabal-mode)'' ];
        bindLocal = {
          haskell-cabal-mode-map = {
            "C-c C-c" = "haskell-process-cabal-build";
            "C-c c" = "haskell-process-cabal";
            "C-c C-b" = "haskell-interactive-bring";
          };
        };
      };

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      haskell-doc = {
        enable = true;
        command = [ "haskell-doc-current-info" ];
      };

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      markdown-mode = {
        enable = true;
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        config = ''
          (setq markdown-command "${pkgs.pandoc}/bin/pandoc")
        '';
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      };

      pandoc-mode = {
        enable = true;
        after = [ "markdown-mode" ];
        hook = [ "markdown-mode" ];
        bindLocal = {
          markdown-mode-map = {
            "C-c C-c" = "pandoc-run-pandoc";
          };
        };
      };

      nix-mode = {
        enable = true;
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        hook = [ "(nix-mode . subword-mode)" ];
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      };

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      # Use ripgrep for fast text search in projects. I usually use
      # this through Projectile.
      ripgrep = {
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        enable = true;
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        command = [ "ripgrep-regexp" ];
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      };

      org = {
        enable = true;
        bind = {
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          "C-c o c" = "org-capture";
          "C-c o a" = "org-agenda";
          "C-c o l" = "org-store-link";
          "C-c o b" = "org-switchb";
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        };
        hook = [
          ''
            (org-mode
             . (lambda ()
                 (add-hook 'completion-at-point-functions
                           'pcomplete-completions-at-point nil t)))
          ''
        ];
        config = ''
          ;; Some general stuff.
          (setq org-reverse-note-order t
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                org-use-fast-todo-selection t
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                org-adapt-indentation nil
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                org-hide-leading-stars t
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                org-hide-emphasis-markers t)
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          (setq org-tag-alist rah-org-tag-alist)

          ;; Add some todo keywords.
          (setq org-todo-keywords
                '((sequence "TODO(t)"
                            "STARTED(s!)"
                            "WAITING(w@/!)"
                            "DELEGATED(@!)"
                            "|"
                            "DONE(d!)"
                            "CANCELED(c@!)")))

          ;; Setup org capture.
          (setq org-default-notes-file (rah-org-file "capture"))

          ;; Active Org-babel languages
          (org-babel-do-load-languages 'org-babel-load-languages
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                                       '((plantuml . t)
                                         (http . t)
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                                         (shell . t)
                                         (sql . t)
                                         (verb . t)))
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          ;; Unfortunately org-mode tends to take over keybindings that
          ;; start with C-c.
          (unbind-key "C-c SPC" org-mode-map)
          (unbind-key "C-c w" org-mode-map)
        '';
      };

      org-agenda = {
        enable = true;
        after = [ "org" ];
        defer = true;
        config = ''
          ;; Set up agenda view.
          (setq org-agenda-files (rah-all-org-files)
                org-agenda-span 5
                org-deadline-warning-days 14
                org-agenda-show-all-dates t
                org-agenda-skip-deadline-if-done t
                org-agenda-skip-scheduled-if-done t
                org-agenda-start-on-weekday nil)
        '';
      };

      org-mobile = {
        enable = true;
        after = [ "org" ];
        defer = true;
      };

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      ob-http = {
        enable = true;
        after = [ "org" ];
        defer = true;
      };

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      ob-plantuml = {
        enable = true;
        after = [ "org" ];
        defer = true;
      };

      org-table = {
        enable = true;
        after = [ "org" ];
        command = [ "orgtbl-to-generic" ];
        hook = [
          # For orgtbl mode, add a radio table translator function for
          # taking a table to a psql internal variable.
          ''
            (orgtbl-mode
             . (lambda ()
                 (defun rah-orgtbl-to-psqlvar (table params)
                   "Converts an org table to an SQL list inside a psql internal variable"
                   (let* ((params2
                           (list
                            :tstart (concat "\\set " (plist-get params :var-name) " '(")
                            :tend ")'"
                            :lstart "("
                            :lend "),"
                            :sep ","
                            :hline ""))
                          (res (orgtbl-to-generic table (org-combine-plists params2 params))))
                     (replace-regexp-in-string ",)'$"
                                               ")'"
                                               (replace-regexp-in-string "\n" "" res))))))
          ''
        ];
        config = ''
          (unbind-key "C-c SPC" orgtbl-mode-map)
          (unbind-key "C-c w" orgtbl-mode-map)
        '';
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        extraConfig = ''
          :functions org-combine-plists
        '';
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      };

      org-capture = {
        enable = true;
        after = [ "org" ];
        config = ''
          (setq org-capture-templates rah-org-capture-templates)
        '';
      };

      org-clock = {
        enable = true;
        after = [ "org" ];
        config = ''
          (setq org-clock-rounding-minutes 5
                org-clock-out-remove-zero-time-clocks t)
        '';
      };

      org-duration = {
        enable = true;
        after = [ "org" ];
        config = ''
          ;; I always want clock tables and such to be in hours, not days.
          (setq org-duration-format (quote h:mm))
        '';
      };

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      org-refile = {
        enable = true;
        after = [ "org" ];
        config = ''
          ;; Refiling should include not only the current org buffer but
          ;; also the standard org files. Further, set up the refiling to
          ;; be convenient with IDO. Follows norang's setup quite closely.
          (setq org-refile-targets '((nil :maxlevel . 2)
                                     (org-agenda-files :maxlevel . 2))
                org-refile-use-outline-path t
                org-outline-path-complete-in-steps nil
                org-refile-allow-creating-parent-nodes 'confirm)
        '';
      };

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      org-superstar = {
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        enable = true;
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        hook = [ "(org-mode . org-superstar-mode)" ];
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      };

      org-tree-slide = {
        enable = true;
        command = [ "org-tree-slide-mode" ];
      };

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      org-variable-pitch = {
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        enable = false;
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        hook = [ "(org-mode . org-variable-pitch-minor-mode)" ];
      };

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      # Set up yasnippet. Defer it for a while since I don't generally
      # need it immediately.
      yasnippet = {
        enable = true;
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        defer = 3;
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        diminish = [ "yas-minor-mode" ];
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        command = [ "yas-global-mode" "yas-minor-mode" "yas-expand-snippet" ];
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        hook = [
          # Yasnippet interferes with tab completion in ansi-term.
          "(term-mode . (lambda () (yas-minor-mode -1)))"
        ];
        config = "(yas-global-mode 1)";
      };

      yasnippet-snippets = {
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        enable = true;
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        after = [ "yasnippet" ];
      };

      # Setup the cperl-mode, which I prefer over the default Perl
      # mode.
      cperl-mode = {
        enable = true;
        defer = true;
        hook = [ "ggtags-mode" ];
        command = [ "cperl-set-style" ];
        config = ''
          ;; Avoid deep indentation when putting function across several
          ;; lines.
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          (setq cperl-indent-parens-as-block t)
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          ;; Use cperl-mode instead of the default perl-mode
          (defalias 'perl-mode 'cperl-mode)
          (cperl-set-style "PerlStyle")
        '';
      };

      # Setup ebib, my chosen bibliography manager.
      ebib = {
        enable = true;
        command = [ "ebib" ];
        hook = [
          # Highlighting of trailing whitespace is a bit annoying in ebib.
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          ''(ebib-index-mode-hook . rah-disable-trailing-whitespace-mode)''
          ''(ebib-entry-mode-hook . rah-disable-trailing-whitespace-mode)''
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        ];
        config = ''
          (setq ebib-latex-preamble '("\\usepackage{a4}"
                                      "\\bibliographystyle{amsplain}")
                ebib-print-preamble '("\\usepackage{a4}")
                ebib-print-tempfile "/tmp/ebib.tex"
                ebib-extra-fields '(crossref
                                    url
                                    annote
                                    abstract
                                    keywords
                                    file
                                    timestamp
                                    doi))
        '';
      };

      smartparens = {
        enable = true;
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        defer = 3;
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        diminish = [ "smartparens-mode" ];
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        command = [ "smartparens-global-mode" "show-smartparens-global-mode" ];
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        bindLocal = {
          smartparens-mode-map = {
            "C-M-f" = "sp-forward-sexp";
            "C-M-b" = "sp-backward-sexp";
          };
        };
        config = ''
          (require 'smartparens-config)
          (smartparens-global-mode t)
          (show-smartparens-global-mode t)
        '';
      };

      fill-column-indicator = {
        enable = true;
        command = [ "fci-mode" ];
      };

      flycheck = {
        enable = true;
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        diminish = [ "flycheck-mode" ];
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        command = [ "global-flycheck-mode" ];
        defer = 1;
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        bind = {
          "M-n" = "flycheck-next-error";
          "M-p" = "flycheck-previous-error";
        };
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        config = ''
          ;; Only check buffer when mode is enabled or buffer is saved.
          (setq flycheck-check-syntax-automatically '(mode-enabled save))

          ;; Enable flycheck in all eligible buffers.
          (global-flycheck-mode)
        '';
      };

      flycheck-plantuml = {
        enable = true;
        hook = [ "(flycheck-mode . flycheck-plantuml-setup)" ];
      };

      projectile = {
        enable = true;
        diminish = [ "projectile-mode" ];
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        command = [ "projectile-mode" "projectile-project-root" ];
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        bindKeyMap = {
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          "C-c p" = "projectile-command-map";
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        };
        config = ''
          (setq projectile-enable-caching t
                projectile-completion-system 'ivy)
          (projectile-mode 1)
        '';
      };

      plantuml-mode = {
        enable = true;
        mode = [ ''"\\.puml\\'"'' ];
      };

      ace-window = {
        enable = true;
        extraConfig = ''
          :bind* (("C-c w" . ace-window)
                  ("M-o" . ace-window))
        '';
      };

      company = {
        enable = true;
        diminish = [ "company-mode" ];
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        command = [ "company-mode" "company-doc-buffer" "global-company-mode" ];
        defer = 1;
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        extraConfig = ''
          :bind (:map company-mode-map
                      ([remap completion-at-point] . company-complete-common)
                      ([remap complete-symbol] . company-complete-common))
        '';
        config = ''
          (setq company-idle-delay 0.3
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                company-show-numbers t
                company-tooltip-maximum-width 100
                company-tooltip-minimum-width 20
                ; Allow me to keep typing even if company disapproves.
                company-require-match nil)
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          (global-company-mode)
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        '';
      };
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      company-box = {
        enable = true;
        hook = [ "(company-mode . company-box-mode)" ];
        config = ''
          (setq company-box-icons-alist 'company-box-icons-all-the-icons)
        '';
      };
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      company-yasnippet = {
        enable = true;
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        after = [ "company" "yasnippet" ];
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        bind = {
          "M-/" = "company-yasnippet";
        };
      };

      company-dabbrev = {
        enable = true;
        after = [ "company" ];
        command = [ "company-dabbrev" ];
        config = ''
          (setq company-dabbrev-downcase nil
                company-dabbrev-ignore-case t)
        '';
      };

      company-quickhelp = {
        enable = true;
        after = [ "company" ];
        command = [ "company-quickhelp-mode" ];
        config = ''
          (company-quickhelp-mode 1)
        '';
      };

      company-cabal = {
        enable = true;
        after = [ "company" ];
        command = [ "company-cabal" ];
        config = ''
          (add-to-list 'company-backends 'company-cabal)
        '';
      };

      php-mode = {
        mode = [ ''"\\.php\\'"'' ];
        hook = [ "ggtags-mode" ];
      };

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      # Needed by Flycheck.
      pkg-info = {
        enable = true;
        command = [ "pkg-info-version-info" ];
      };

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      protobuf-mode = {
        mode = [ ''"'\\.proto\\'"'' ];
      };

      python = {
        enable = true;
        mode = [ ''("\\.py\\'" . python-mode)'' ];
        hook = [ "ggtags-mode" ];
      };

      transpose-frame = {
        enable = true;
        bind = {
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          "C-c f t" = "transpose-frame";
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        };
      };

      tt-mode = {
        enable = true;
        mode = [ ''"\\.tt\\'"'' ];
      };

      smart-tabs-mode = {
        enable = false;
        config = ''
          (smart-tabs-insinuate 'c 'c++ 'cperl 'java)
        '';
      };

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      yaml-mode.enable = true;
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      wc-mode = {
        enable = true;
        command = [ "wc-mode" ];
      };

      web-mode = {
        enable = true;
        mode = [
          ''"\\.html\\'"''
          ''"\\.jsx?\\'"''
        ];
        config = ''
          (setq web-mode-attr-indent-offset 4
                web-mode-code-indent-offset 2
                web-mode-markup-indent-offset 2)

          (add-to-list 'web-mode-content-types '("jsx" . "\\.jsx?\\'"))
        '';
      };

      dired = {
        enable = true;
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        command = [ "dired" "dired-jump" ];
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        config = ''
          (put 'dired-find-alternate-file 'disabled nil)
          ;; Use the system trash can.
          (setq delete-by-moving-to-trash t)
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          (setq dired-listing-switches "-alvh --group-directories-first")
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        '';
      };

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      all-the-icons-dired = {
        enable = true;
        hook = [ "(dired-mode . all-the-icons-dired-mode)" ];
      };

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      wdired = {
        enable = true;
        bindLocal = {
          dired-mode-map = {
            "C-c C-w" = "wdired-change-to-wdired-mode";
          };
        };
        config = ''
          ;; I use wdired quite often and this setting allows editing file
          ;; permissions as well.
          (setq wdired-allow-to-change-permissions t)
        '';
      };

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      # Hide hidden files when opening a dired buffer. But allow showing them by
      # pressing `.`.
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      dired-x = {
        enable = true;
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        hook = [ "(dired-mode . dired-omit-mode)" ];
        bindLocal.dired-mode-map = {
          "." = "dired-omit-mode";
        };
        config = ''
          (setq dired-omit-verbose nil
                dired-omit-files (concat dired-omit-files "\\|^\\..+$"))
        '';
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      };

      recentf = {
        enable = true;
        command = [ "recentf-mode" ];
        config = ''
          (setq recentf-save-file (locate-user-emacs-file "recentf")
                recentf-max-menu-items 20
                recentf-max-saved-items 500
                recentf-exclude '("COMMIT_MSG" "COMMIT_EDITMSG"))
        '';
      };

      nxml-mode = {
        enable = true;
        mode = [ ''"\\.xml\\'"'' ];
        config = ''
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          (setq nxml-child-indent 2
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                nxml-attribute-indent 4
                nxml-slash-auto-complete-flag t)
          (add-to-list 'rng-schema-locating-files
                       "~/.emacs.d/nxml-schemas/schemas.xml")
        '';
      };

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      rust-mode.enable = true;
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      sendmail = {
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        command = [ "mail-mode" "mail-text" ];
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        mode = [
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          ''("^mutt-" . mail-mode)''
          ''("\\.article" . mail-mode)''
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        ];
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