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stripe-buffer.el
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;;; stripe-buffer.el --- Use a different background for even and odd lines
;; Copyright (C) 2008-2009 Andy Stewart
;; Copyright (C) 2012-2013 sabof
;; Author: Andy Stewart <[email protected]>
;; Maintainer: sabof <[email protected]>
;; URL: https://github.com/sabof/stripe-buffer
;; Package-Requires: ((cl-lib "1.0"))
;; Version: 0.2.4
;;; Commentary:
;; Use different background colors for even and odd lines. With the
;; help of library `hl-line' yet another color can be used for the
;; current line.
;; The project is hosted at https://github.com/sabof/stripe-buffer
;;; License:
;; This file is NOT part of GNU Emacs.
;;
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2, or (at
;; your option) any later version.
;;
;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program ; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Code:
(require 'cl-lib)
(defgroup stripe-buffer nil
"Use different background for even and odd lines."
:group 'wp)
(defface stripe-highlight
'((((class color) (background dark))
(:background "#444444"))
(((class color) (background light))
(:background "#CCCCCC")))
"Face for stripes."
:group 'stripe-buffer)
(defface stripe-hl-line
`((t
:background ,(face-attribute 'default :foreground)
:foreground ,(face-attribute 'default :background)))
"Bold face for highlighting the current line in Hl-Line mode."
:group 'stripe-buffer)
(defcustom stripe-height 1
"Height of stripes."
:group 'stripe-buffer
:type 'integer)
(defcustom stripe-in-table-regex
"^[ \t]*\\(?1:[|+].+[|+]\\) *$"
"Regular expression that determines whether a line contains a table row.
Used by `stripe-table-mode' Only the first matching group will be painted."
:group 'stripe-buffer
:type 'string)
(defvar stripe-highlight-face 'stripe-highlight)
(defvar-local sb/overlays nil)
(defvar-local sb/is-listified nil)
(defvar-local sb/modified-flag nil)
(defvar-local sb/timer nil)
(defun sb/window-limits (&optional window)
(save-excursion
(let (( win-start (window-start window)))
(goto-char (window-end window t))
(unless (= (line-beginning-position) (point))
(forward-line 1))
(cons win-start (point)))))
(defun sb/buffer-visible-regions (&optional buffer-or-name)
(mapcar 'sb/window-limits
(cl-remove-if-not
(lambda (win) (frame-visible-p (window-frame win)))
(get-buffer-window-list buffer-or-name nil t))))
(defun sb/compress-ranges (ranges)
(let* (( dirty (cl-sort (cl-copy-list ranges)
'< :key 'car))
clean)
(while (cond
( (not dirty)
nil)
( (null (cdr dirty))
(push (pop dirty) clean)
nil)
( (>= (cdr (car dirty))
(car (cadr dirty)))
(setq dirty (cons (cons (car (car dirty))
(max (cdr (car dirty))
(cdr (cadr dirty))))
(nthcdr 2 dirty))))
( t (push (pop dirty) clean))))
(nreverse clean)))
(defun sb/buffer-visible-regions-compressed ()
(sb/compress-ranges (sb/buffer-visible-regions)))
(defun sb/clear-stripes (&rest ignore)
"Clear stripe overlays in current buffer."
(mapc 'delete-overlay sb/overlays)
(setq sb/overlays nil))
(defun sb/redraw-region (start end get-overlay-create-function)
(let* (( interval
(* 2 stripe-height))
( draw-stripe
(lambda (height)
;; `region' available through dynamic binding
(when (< (point) end)
(let* (( stripe-region
(list (point)
(progn
(forward-line height)
(if (<= (point) end)
(point)
(progn
(goto-char end)
(point))))))
( overlay (apply get-overlay-create-function stripe-region)))
(overlay-put overlay 'face stripe-highlight-face)
(overlay-put overlay 'is-stripe t)
(push overlay sb/overlays)))))
( goto-start-pos
(lambda ()
(let (( start-offset (mod (1- (line-number-at-pos)) interval)))
(if (< start-offset stripe-height) ; in first part
(progn
(forward-line (- stripe-height start-offset))
(funcall draw-stripe stripe-height))
(funcall draw-stripe (- interval start-offset))
)))))
(funcall goto-start-pos)
(while (< (point) end)
(forward-line stripe-height)
(funcall draw-stripe stripe-height)
)
))
(defun sb/redraw-regions (regions available)
(let* (( get-overlay-create
(lambda (start end)
(let ((old-overlay (pop available)))
(if old-overlay
(progn
(move-overlay old-overlay start end)
old-overlay)
(make-overlay start end))))))
(save-excursion
(cl-dolist (region regions)
(goto-char (car region))
(sb/redraw-region (car region) (cdr region)
get-overlay-create))
(mapc 'delete-overlay available))))
(defun sb/redraw-window (&optional window &rest ignore)
(let* (( region (sb/window-limits window))
( old-overlays (cl-remove-if-not
(lambda (ov) (overlay-get ov 'is-stripe))
(overlays-in (car region) (cdr region)))))
(setq sb/overlays (cl-set-difference sb/overlays old-overlays))
(sb/redraw-regions (list region) old-overlays)
))
(defun sb/redraw-buffer-in-all-windows (&rest ignore)
(sb/redraw-regions (sb/buffer-visible-regions-compressed)
(prog1 sb/overlays
(setq sb/overlays nil))))
(defun sb/visible-table-ranges ()
(let (( visible-ranges (sb/buffer-visible-regions-compressed))
ranges)
(cl-dolist (vr visible-ranges)
(save-excursion
(goto-char (car vr))
(while (and (<= (point) (cdr vr))
(re-search-forward stripe-in-table-regex (cdr vr) t)
(not (invisible-p (match-beginning 0))))
(push (cons (match-beginning 1) (match-end 1)) ranges)
)))
(sb/compress-ranges ranges)))
(defun sb/redraw-all-tables (&rest ignore)
(sb/redraw-regions (sb/visible-table-ranges)
(prog1 sb/overlays
(setq sb/overlays nil))))
(defun sb/add-hooks (hooks)
(cl-dolist (hook hooks)
(add-hook (car hook) (cdr hook) nil t)))
(defun sb/remove-hooks (hooks)
(cl-dolist (hook hooks)
(remove-hook (car hook) (cdr hook) t)))
;;; Interface
(defun sb/set-timer (redraw-func)
(unless sb/timer
(setq sb/timer
(run-with-idle-timer
0 nil (lambda (buffer redraw-func)
(when (buffer-live-p buffer)
(with-current-buffer buffer
(funcall redraw-func)
(setq sb/timer nil))))
(current-buffer)
redraw-func))))
(defun sb/cancel-timer ()
(when sb/timer
(cancel-timer sb/timer)
(setq sb/timer nil)))
;;;###autoload
(define-minor-mode stripe-buffer-mode
"Stripe buffer mode"
nil nil nil
(let* (( after-change
(lambda (&rest ignore)
(setq sb/modified-flag t)
;; For cases when a change is made by a timer, or a process filter
(sb/set-timer 'sb/redraw-buffer-in-all-windows)))
( post-command
(lambda (&rest ignore)
(if sb/modified-flag
(progn
(sb/redraw-buffer-in-all-windows)
(sb/cancel-timer))
(sb/set-timer 'sb/redraw-buffer-in-all-windows))
(setq sb/modified-flag nil)))
( hooks `((after-change-functions . ,after-change)
(post-command-hook . ,post-command)
(window-scroll-functions . sb/redraw-window)
(change-major-mode-hook . sb/clear-stripes)
(window-configuration-change-hook . sb/redraw-buffer-in-all-windows)
)))
(if stripe-buffer-mode
(progn
(stripe-table-mode -1)
(sb/add-hooks hooks)
(sb/redraw-buffer-in-all-windows))
(sb/remove-hooks hooks)
(sb/clear-stripes)
)))
;;;###autoload
(defun turn-on-stripe-buffer-mode ()
"Turn on `stripe-buffer-mode'."
(interactive)
(stripe-buffer-mode 1))
;;;###autoload
(define-minor-mode stripe-table-mode
"Stripe table mode"
nil nil nil
(let* (( after-change
(lambda (&rest ignore)
(setq sb/modified-flag t)
(sb/set-timer 'sb/redraw-all-tables)))
( post-command
(lambda (&rest ignore)
(if sb/modified-flag
(progn
(sb/redraw-all-tables)
(sb/cancel-timer))
(sb/set-timer 'sb/redraw-all-tables))
(setq sb/modified-flag nil)))
( hooks
`((after-change-functions . ,after-change)
(post-command-hook . ,post-command)
(window-scroll-functions . sb/redraw-all-tables)
(change-major-mode-hook . sb/clear-stripes)
(window-configuration-change-hook . sb/redraw-all-tables))))
(if stripe-table-mode
(progn
(stripe-buffer-mode -1)
(sb/add-hooks hooks)
(sb/redraw-all-tables))
(progn
(sb/remove-hooks hooks)
(sb/clear-stripes)
))))
;;;###autoload
(defun turn-on-stripe-table-mode ()
"Turn on `stripe-table-mode'."
(interactive)
(stripe-table-mode 1))
;;;###autoload
(defun org-table-stripes-enable ()
"Backward compatibility"
(interactive)
(stripe-table-mode 1))
;;;###autoload
(defun stripe-listify-buffer ()
"Turn on `stripe-buffer-mode' and `hl-line-mode'."
(interactive)
(setq sb/is-listified t)
(setq cursor-type nil)
(stripe-buffer-mode 1)
(setq-local face-remapping-alist
`((hl-line stripe-hl-line)))
(hl-line-mode 1))
(defadvice hl-line-highlight (after stripe-set-priority activate)
(when stripe-buffer-mode
(overlay-put hl-line-overlay 'priority 10)))
(defun stripe-wdired-enable-cursor ()
(when sb/is-listified
(hl-line-mode -1)
(setq cursor-type t)))
(add-hook 'wdired-mode-hook 'stripe-wdired-enable-cursor)
(defadvice wdired-finish-edit (before stripe-hide-cursor activate)
(when sb/is-listified
(hl-line-mode 1)
(setq cursor-type nil)))
(defadvice image-dired-dired-toggle-marked-thumbs
(around disable-stripes activate)
(let (( was-stripe-buffer-mode
stripe-buffer-mode))
(when was-stripe-buffer-mode
(stripe-buffer-mode -1))
ad-do-it
(when was-stripe-buffer-mode
(stripe-buffer-mode 1))))
(provide 'stripe-buffer)
;; Local Variables:
;; indent-tabs-mode: nil
;; lisp-backquote-indentation: t
;; End:
;;; stripe-buffer.el ends here