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org-rlinum.el
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org-rlinum.el
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;;; org-rlinum.el --- display relative line correctly for org-mode
;; Author: Rui Zhao
;; Version: 0.0.1
;; Keywords: convenience
;;; Code:
(eval-when-compile (require 'cl))
(require 'linum)
(defgroup org-rlinum nil
"Show relative line number on fringe, espically for org-mode."
:group 'convenience)
(defcustom org-rlinum-format-str "%3d"
"Format for displaying relative line numbers."
:type 'string
:group 'org-rlinum)
(defcustom org-rlinum-current-marker " ~>"
"Current line marker."
:type 'string
:group 'org-rlinum)
(defcustom org-rlinum-org-max 25
"Max number of relative line to display for org mode."
:type 'number
:group 'org-rlinum)
;; Internal Variables
(defvar org-rlinum-last-pos 0
"Store last position.")
(defvar org-rlinum-pcounter 0
"Store number of positive lines.")
(defvar org-nlinum-ncounter 0
"Store number of negative lines.")
(defvar org-rlinum-plist '()
"Store line number of positive lines.")
(defvar org-rlinum-nlist '()
"Store line number of negative lines.")
(defun org-rlinum-build-plist ()
"Build positive lines' list in the windows from bottom up."
(save-excursion
(beginning-of-line)
(setq org-rlinum-pcounter 0)
(setq org-rlinum-plist '())
(let ((rsize 0))
(while (and (<= (point) (window-end))
(< (point) (point-max))
(< rsize org-rlinum-org-max))
(incf rsize)
(line-move-visual 1 t)
(add-to-list 'org-rlinum-plist (line-number-at-pos)))
(setq org-rlinum-plist (reverse org-rlinum-plist)))))
(defun org-rlinum-build-nlist ()
"Build negative lines' list in the windows from top down."
(save-excursion
(beginning-of-line)
(setq org-rlinum-ncounter 0)
(setq org-rlinum-nlist '())
(let ((rsize 0))
(while (and (>= (point) (window-start))
(> (point) (point-min))
(<= rsize org-rlinum-org-max))
(incf rsize)
(add-to-list 'org-rlinum-nlist (line-number-at-pos))
(line-move-visual -1 t)
(incf org-rlinum-ncounter))
(if (= (point-min) (window-start))
(progn
(add-to-list 'org-rlinum-nlist (line-number-at-pos))
(incf org-rlinum-ncounter))))))
(defun org-rlinum-update-face (line)
"Update face according to line numbers."
(cond ((eq line -1)
(propertize "" 'face 'linum))
((eq line 0)
(propertize org-rlinum-current-marker 'face 'linum))
(t
(propertize
(format org-rlinum-format-str line)
'face
'linum))))
(defun org-rlinum-org (line)
"Update relative line number for org mode."
(if (> org-rlinum-ncounter 0)
(if (eq line (car-safe org-rlinum-nlist))
(progn
(setq org-rlinum-nlist (cdr-safe org-rlinum-nlist))
(org-rlinum-update-face (decf org-rlinum-ncounter)))
(org-rlinum-update-face -1))
(if (eq line (car-safe org-rlinum-plist))
(progn
(setq org-rlinum-plist (cdr-safe org-rlinum-plist))
(org-rlinum-update-face (incf org-rlinum-pcounter)))
(org-rlinum-update-face -1))))
(defun org-rlinum-normal (line)
"Update relative line number for normal mode."
(org-rlinum-update-face (abs (- line org-rlinum-last-pos))))
(defadvice linum-update (before org-rlinum-update activate)
"This advice get the last pos and build positive and negative
list."
(setq org-rlinum-last-pos (line-number-at-pos))
(when (eq linum-format 'org-rlinum-org)
(org-rlinum-build-nlist)
(org-rlinum-build-plist)))
(defun org-rlinum-toggle ()
"Toggle between org-rlinum mode and normal relative line mode."
(interactive)
(if (eq linum-format 'org-rlinum-normal)
(progn
(setq linum-format 'org-rlinum-org)
(message "org-rlinum-org"))
(progn
(setq linum-format 'org-rlinum-normal)
(message "org-rlinum-normal"))))
(defun org-rlinum-relative-toggle ()
"Display non-relative number on fringe."
(interactive)
(if (eq linum-format 'dynamic)
(setq linum-format 'org-rlinum-normal)
(setq linum-format 'dynamic)))
(setq linum-format 'org-rlinum-normal)
(provide 'org-rlinum)