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(let ((cache-dir (substitute-in-file-name "${XDG_CACHE_HOME}/emacs/"))
      (data-dir (substitute-in-file-name "${XDG_DATA_HOME}/emacs/")))
  (setq abbrev-file-name (concat cache-dir "abbrev-def")
        auto-save-list-file-prefix (concat cache-dir "auto-save/")
        backup-directory-alist `(("." . ,(concat cache-dir "backups")))
        custom-file (concat cache-dir "custom.el")
        ido-save-directory-list-file (concat cache-dir "ido.last")
        package-user-dir (concat data-dir "elpa")
        transient-history-file (concat cache-dir "transient/history.el")))

(defun source-if-exists (filename)
  (load (concat (file-truename "~/.emacs.d/../")
                (substitute-in-file-name filename)) t))

(require 'package)
(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/"))
(package-initialize)

(unless (package-installed-p 'use-package)
  (package-refresh-contents)
  (package-install 'use-package))
(require 'use-package)

(setq ibuffer-saved-filter-groups
      '(("default"
         ("Emacs" (or (mode . completion-list-mode)
                      (mode . debugger-mode)
                      (mode . help-mode)
                      (mode . messages-buffer-mode)
                      (name . "^\\*scratch\\*$")))
         ("Magit" (or (mode . magit-process-mode)
                      (mode . magit-status-mode)))
         ("Dired" (mode . dired-mode))
         ("Shells" (mode . term-mode))
         ("Manuals" (or (mode . Info-mode)
                        (mode . Man-mode)))))
      ibuffer-show-empty-filter-groups nil)

(add-hook 'ibuffer-mode-hook
          (lambda () (ibuffer-switch-to-saved-filter-groups "default")))

(setq-default indent-tabs-mode nil
              fill-column 72)
(setq backup-by-copying t
      display-time-24hr-format t
      inhibit-startup-screen t
      recenter-positions '(3 middle top bottom)
      require-final-newline t
      sentence-end-double-space nil
      show-paren-delay 0
      uniquify-buffer-name-style 'post-forward-angle-brackets
      vc-follow-symlinks nil)

(auto-save-mode -1)
(auto-save-visited-mode 1)
(column-number-mode 1)
(display-time-mode 1)
(electric-indent-mode -1)
(evil-mode 1)
(global-auto-revert-mode 1)
(ido-mode 1)
(menu-bar-mode -1)
(show-paren-mode 1)
(tool-bar-mode -1)
(add-to-list 'auto-mode-alist '("\\.service\\'" . conf-mode))
(add-to-list 'auto-mode-alist '("\\.timer\\'" . conf-mode))
(add-to-list 'auto-mode-alist '("/PKGBUILD\\'" . shell-script-mode))
(add-to-list 'ido-ignore-files ".DS_Store")
(add-to-list 'ido-ignore-files "__pycache__")
(add-to-list 'magic-mode-alist '("#compdef .+" . sh-mode))

(when (display-graphic-p)
  (blink-cursor-mode -1)
  (scroll-bar-mode -1))

(use-package magit
  :init (setq git-commit-summary-max-length 50)
  :config (require 'evil-magit)
  :bind (("C-c k" . magit-status))
  :ensure t)

(use-package evil-magit :ensure t)

(global-set-key (kbd "<C-tab>") 'other-window)
(global-set-key (kbd "<C-M-tab>") 'other-frame)
(global-set-key (kbd "C-x C-b") 'ibuffer)
(global-set-key (kbd "C-x 0")
                (lambda ()
                  (interactive)
                  (delete-window)
                  (balance-windows)))
(global-set-key (kbd "C-x 2")
                (lambda ()
                  (interactive)
                  (split-window-vertically)
                  (balance-windows)))
(global-set-key (kbd "C-x 3")
                (lambda ()
                  (interactive)
                  (split-window-horizontally)
                  (balance-windows)))

(add-hook 'bazel-mode-hook (setq bazel-mode-buildifier-before-save t))
(add-hook 'before-save-hook 'delete-trailing-whitespace)
(add-hook 'c++-mode-hook (lambda () (google-set-c-style)))
(add-hook 'go-mode-hook
          (lambda ()
            (setq-local gofmt-command "goimports")
            (setq-local tab-width 2)
            (add-hook 'before-save-hook 'gofmt-before-save nil t)))
(add-hook 'ibuffer-mode-hook
          (lambda () (ibuffer-switch-to-saved-filter-groups "default")))
(add-hook 'server-switch-hook
          (lambda ()
            (menu-bar-mode -1)
            (scroll-bar-mode -1)))
(add-hook 'sh-mode-hook (lambda () (setq-local sh-basic-offset 2)))

(source-if-exists "dotfiles-${UNAME}/emacs/init.el")
(source-if-exists "dotfiles-${DOMAIN}/emacs/init.el")
(source-if-exists "dotfiles-${HOST}/emacs/init.el")