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path: root/emacs/inits/13-ibuffer.el
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;; Time-stamp: <2021-09-27 08h47 EDT (hobbies)>

(use-package ibuffer
  :bind (("C-x C-b" . ibuffer))
  :hook (ibuffer-mode .  (lambda ()
			   (ibuffer-switch-to-saved-filter-groups "default")))
  :config
  (setq ibuffer-display-summary nil
	ibuffer-saved-filter-groups
	'(("default"
	   ("agda" (or (mode . agda2-mode)
		       (name . "^\\*[aA]gda")))
	   ("coq" (or (mode . coq-mode)
		      (mode . coq-goals-mode)
		      (mode . coq-response-mode)
		      (mode . coq-shell-mode)))
	   ("c" (or (mode . c-mode)
		    (mode . makefile-gmake-mode)))
	   ("dired" (mode . dired-mode))
	   ("elisp" (or (mode . emacs-lisp-mode)
			(name . "^\\*Backtrace\\*")))
	   ("emacs" (or (name . "^\\*scratch\\*$")
			(name . "^\\*Messages\\*$")
			(name . "^\\*init log\\*$")
			(name . "^\\*Compile-Log\\*$")
			(mode . helpful-mode)
			(name . "^\\*Help\\*$")))
	   ("irc" (mode . rcirc-mode))
	   ("magit" (name . "^magit[:-]"))
	   ("REPL" (name . "^\\*.*REPL.*\\*$"))
	   ("rust" (mode . rust-mode))
	   ("slime" (name . "^\\*slime-[^*]*\\*$"))
	   ("tex" (mode . latex-mode))
	   ("web" (or (mode . js2-mode)
		      (mode . js-mode)
		      (mode . html-mode)
		      (mode . css-mode)
		      (mode . mhtml-mode)))
	   ("zig" (or (mode . zig-mode)
		      (name . "^\\*zig.*\\*$")
		      (name . "^\\*zls.*\\*$"))))))

  (defadvice ibuffer-update-title-and-summary (after remove-column-titles)
    (with-current-buffer "*Ibuffer*"
      (read-only-mode -1)
      (goto-char 1)
      (search-forward "-\n" nil t)
      (delete-region 1 (point))
      (let ((window-min-height 1))
	;; save a little screen estate
	(shrink-window-if-larger-than-buffer))
      (read-only-mode 1)))

  (ad-activate 'ibuffer-update-title-and-summary)

  (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)))))

  (setq 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))))