+*** Ibuffer
+
+#+begin_src emacs-lisp
+(use-feature ibuffer
+ :bind
+ (("C-x C-b" . ibuffer-other-window)
+ :map ibuffer-mode-map
+ ("P" . ibuffer-backward-filter-group)
+ ("N" . ibuffer-forward-filter-group)
+ ("M-p" . ibuffer-do-print)
+ ("M-n" . ibuffer-do-shell-command-pipe-replace))
+ :config
+ ;; Use human readable Size column instead of original one
+ (define-ibuffer-column size-h
+ (:name "Size" :inline t)
+ (cond
+ ((> (buffer-size) 1000000) (format "%7.1fM" (/ (buffer-size) 1000000.0)))
+ ((> (buffer-size) 100000) (format "%7.0fk" (/ (buffer-size) 1000.0)))
+ ((> (buffer-size) 1000) (format "%7.1fk" (/ (buffer-size) 1000.0)))
+ (t (format "%8d" (buffer-size)))))
+ :custom
+ (ibuffer-saved-filter-groups
+ '(("default"
+ ("dired" (mode . dired-mode))
+ ("org" (mode . org-mode))
+ ("gnus"
+ (or
+ (mode . gnus-group-mode)
+ (mode . gnus-summary-mode)
+ (mode . gnus-article-mode)
+ ;; not really, but...
+ (mode . message-mode)))
+ ("web"
+ (or
+ (mode . web-mode)
+ (mode . css-mode)
+ (mode . scss-mode)
+ (mode . js2-mode)))
+ ("shell"
+ (or
+ (mode . eshell-mode)
+ (mode . shell-mode)
+ (mode . term-mode)))
+ ("programming"
+ (or
+ (mode . python-mode)
+ (mode . c-mode)
+ (mode . c++-mode)
+ (mode . java-mode)
+ (mode . emacs-lisp-mode)
+ (mode . scheme-mode)
+ (mode . haskell-mode)
+ (mode . lean-mode)))
+ ("emacs"
+ (or
+ (name . "^\\*scratch\\*$")
+ (name . "^\\*Messages\\*$")))
+ ("erc" (mode . erc-mode)))))
+ (ibuffer-formats
+ '((mark modified read-only locked " "
+ (name 18 18 :left :elide)
+ " "
+ (size-h 9 -1 :right)
+ " "
+ (mode 16 16 :left :elide)
+ " " filename-and-process)
+ (mark " "
+ (name 16 -1)
+ " " filename)))
+ :hook (ibuffer . (lambda () (ibuffer-switch-to-saved-filter-groups "default"))))
+#+end_src
+
+*** Outline
+
+#+begin_src emacs-lisp
+(use-feature outline
+ :hook (prog-mode . outline-minor-mode)
+ :bind
+ (:map
+ outline-minor-mode-map
+ ("<s-tab>" . outline-toggle-children)
+ ("M-p" . outline-previous-visible-heading)
+ ("M-n" . outline-next-visible-heading)
+ :prefix-map a/outline-prefix-map
+ :prefix "s-o"
+ ("TAB" . outline-toggle-children)
+ ("a" . outline-hide-body)
+ ("H" . outline-hide-body)
+ ("S" . outline-show-all)
+ ("h" . outline-hide-subtree)
+ ("s" . outline-show-subtree)))
+#+end_src
+
+*** Dired
+
+#+begin_src emacs-lisp
+(use-feature ls-lisp
+ :custom (ls-lisp-dirs-first t))
+
+(use-feature dired
+ :config
+ (setq dired-listing-switches "-alh"
+ ls-lisp-use-insert-directory-program nil)
+
+ ;; easily diff 2 marked files
+ ;; https://oremacs.com/2017/03/18/dired-ediff/
+ (defun dired-ediff-files ()
+ (interactive)
+ (require 'dired-aux)
+ (defvar ediff-after-quit-hook-internal)
+ (let ((files (dired-get-marked-files))
+ (wnd (current-window-configuration)))
+ (if (<= (length files) 2)
+ (let ((file1 (car files))
+ (file2 (if (cdr files)
+ (cadr files)
+ (read-file-name
+ "file: "
+ (dired-dwim-target-directory)))))
+ (if (file-newer-than-file-p file1 file2)
+ (ediff-files file2 file1)
+ (ediff-files file1 file2))
+ (add-hook 'ediff-after-quit-hook-internal
+ (lambda ()
+ (setq ediff-after-quit-hook-internal nil)
+ (set-window-configuration wnd))))
+ (error "no more than 2 files should be marked"))))
+ :bind (:map dired-mode-map
+ ("b" . dired-up-directory)
+ ("e" . dired-ediff-files)
+ ("E" . dired-toggle-read-only)
+ ("\\" . dired-hide-details-mode)
+ ("z" . (lambda ()
+ (interactive)
+ (a/dired-start-process "zathura"))))
+ :hook (dired-mode . dired-hide-details-mode))
+#+end_src
+
+*** Help
+
+#+begin_src emacs-lisp
+(use-feature help
+ :config
+ (temp-buffer-resize-mode)
+ (setq help-window-select t))