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+*.elc
+*~
+elpa/
+.DS_Store

core/page-break-lines.el

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+;;; page-break-lines.el --- Display ^L page breaks as tidy horizontal lines  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2012-2015 Steve Purcell
+
+;; Author: Steve Purcell <steve@sanityinc.com>
+;; URL: https://github.com/purcell/page-break-lines
+;; Package-Version: 0
+;; Package-Requires: ((emacs "24.4"))
+;; Keywords: convenience, faces
+
+;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This library provides a global mode which displays form feed
+;; characters as horizontal rules.
+
+;; Install from Melpa or Marmalade, or add to `load-path' and use
+;; (require 'page-break-lines).
+
+;; Use `page-break-lines-mode' to enable the mode in specific buffers,
+;; or customize `page-break-lines-modes' and enable the mode globally with
+;; `global-page-break-lines-mode'.
+
+;; Issues and limitations:
+
+;; If `page-break-lines-char' is displayed at a different width to
+;; regular characters, the rule may be either too short or too long:
+;; rules may then wrap if `truncate-lines' is nil.  On some systems,
+;; Emacs may erroneously choose a different font for the page break
+;; symbol, which choice can be overridden using code such as:
+
+;; (set-fontset-font "fontset-default"
+;;                   (cons page-break-lines-char page-break-lines-char)
+;;                   (face-attribute 'default :family))
+
+;; Use `describe-char' on a page break char to determine whether this
+;; is the case.
+
+;; Additionally, the use of `text-scale-increase' or
+;; `text-scale-decrease' will cause the rule width to be incorrect,
+;; because the reported window width (in characters) will continue to
+;; be the width in the frame's default font, not the scaled font used to
+;; display the rule.
+
+;; Adapted from code http://www.emacswiki.org/emacs/PageBreaks
+
+;;; Code:
+
+(defgroup page-break-lines nil
+  "Display ugly ^L page breaks as tidy horizontal lines."
+  :prefix "page-break-lines-"
+  :group 'faces)
+
+(defcustom page-break-lines-char ?─
+  "Character used to render page break lines."
+  :type 'character
+  :group 'page-break-lines)
+
+(defcustom page-break-lines-lighter " PgLn"
+  "Mode-line indicator for `page-break-lines-mode'."
+  :type '(choice (const :tag "No lighter" "") string)
+  :group 'page-break-lines)
+
+(defcustom page-break-lines-max-width nil
+  "If non-nil, maximum width (in characters) of page break indicator.
+If nil, indicator will span the width of the frame."
+  :type '(choice integer (const :tag "Full width" nil))
+  :group 'page-break-lines)
+
+(defcustom page-break-lines-modes
+  '(emacs-lisp-mode lisp-mode scheme-mode compilation-mode outline-mode help-mode)
+  "Modes in which to enable `page-break-lines-mode'."
+  :type '(repeat symbol)
+  :group 'page-break-lines)
+
+(defface page-break-lines
+  '((t :inherit font-lock-comment-face :bold nil :italic nil))
+  "Face used to colorize page break lines.
+If using :bold or :italic, please ensure `page-break-lines-char'
+is available in that variant of your font, otherwise it may be
+displayed as a junk character."
+  :group 'page-break-lines)
+
+
+
+;;;###autoload
+(define-minor-mode page-break-lines-mode
+  "Toggle Page Break Lines mode.
+
+In Page Break mode, page breaks (^L characters) are displayed as a
+horizontal line of `page-break-lines-char' characters."
+  :lighter page-break-lines-lighter
+  :group 'page-break-lines
+  (page-break-lines--update-display-tables))
+
+(dolist (hook '(window-configuration-change-hook
+                window-size-change-functions
+                after-setting-font-hook
+                display-line-numbers-mode-hook))
+  (add-hook hook 'page-break-lines--update-display-tables))
+
+
+
+(defun page-break-lines--update-display-table (window)
+  "Modify a display-table that displays page-breaks prettily.
+If the buffer inside WINDOW has `page-break-lines-mode' enabled,
+its display table will be modified as necessary."
+  (with-current-buffer (window-buffer window)
+    (with-selected-window window
+      (if page-break-lines-mode
+          (progn
+            (unless buffer-display-table
+              (setq buffer-display-table (make-display-table)))
+            (let ((default-height (face-attribute 'default :height nil 'default)))
+              (set-face-attribute 'page-break-lines nil :height default-height)
+              (let* ((cwidth (char-width page-break-lines-char))
+                     (wwidth-pix (- (window-width nil t)
+                                    (if (and (bound-and-true-p display-line-numbers)
+                                             (fboundp 'line-number-display-width))
+                                        (line-number-display-width t)
+                                      0)))
+                     (width (- (/ wwidth-pix (frame-char-width) cwidth)
+                               (if (display-graphic-p) 0 1)))
+                     (width (if page-break-lines-max-width
+                                (min width page-break-lines-max-width)
+                              width))
+                     (glyph (make-glyph-code page-break-lines-char 'page-break-lines))
+                     (new-display-entry (vconcat (make-list width glyph))))
+                (unless (equal new-display-entry (elt buffer-display-table ?\^L))
+                  (aset buffer-display-table ?\^L new-display-entry)))))
+        (when (and (apply 'derived-mode-p page-break-lines-modes)
+                   buffer-display-table)
+          (aset buffer-display-table ?\^L nil))))))
+
+(defun page-break-lines--update-display-tables  (&optional frame)
+  "Function called for updating display table in windows of FRAME."
+  (unless (minibufferp)
+    (mapc 'page-break-lines--update-display-table (window-list frame 'no-minibuffer))))
+
+
+
+;;;###autoload
+(defun page-break-lines-mode-maybe ()
+  "Enable `page-break-lines-mode' in the current buffer if desired.
+When `major-mode' is listed in `page-break-lines-modes', then
+`page-break-lines-mode' will be enabled."
+  (if (and (not (minibufferp))
+           (apply 'derived-mode-p page-break-lines-modes))
+      (page-break-lines-mode 1)))
+
+;;;###autoload
+(define-global-minor-mode global-page-break-lines-mode
+  page-break-lines-mode page-break-lines-mode-maybe
+  :require 'page-break-lines
+  :group 'page-break-lines)
+
+
+(provide 'page-break-lines)
+
+;; Local Variables:
+;; coding: utf-8
+;; checkdoc-minor-mode: t
+;; End:
+
+;;; page-break-lines.el ends here