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;;; header-info.el --- Display buffer information in the header line
;; Copyright (C) 2020 Ferdinand Pieper
;; Author: Ferdinand Pieper <mail@pie.tf>
;; Created: 23 Aug 2020
;; URL: https://github.com/fpiper/header-info
;; This file is not part of GNU Emacs.
;; This file 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 file 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 GNU Emacs; see the file COPYING. If not, see
;; <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Minor mode to display part of the mode line in the header line
;; instead. Customize `header-info-header-line-format' and
;; `header-info-mode-line-format' to determine what to show in the
;; header and mode line when turned on.
;;
;;; Code:
(defvar header-info-old-header-line nil)
(defvar header-info-old-mode-line nil)
(make-local-variable 'header-info-old-header-line)
(make-local-variable 'header-info-old-mode-line)
(defvar mode-line-major-mode
(list `(:propertize ("" mode-name)
help-echo "Major mode\n\
mouse-1: Display major mode menu\n\
mouse-2: Show help for major mode\n\
mouse-3: Toggle minor modes"
mouse-face mode-line-highlight
local-map ,mode-line-major-mode-keymap)
'("" mode-line-process))
"Mode line construct for displaying major and minor modes.")
(defvar mode-line-minor-modes
(let ((recursive-edit-help-echo "Recursive edit, type C-M-c to get out"))
(list (propertize "%[" 'help-echo recursive-edit-help-echo)
"("
`(:propertize ("" minor-mode-alist)
mouse-face mode-line-highlight
help-echo "Minor mode\n\
mouse-1: Display minor mode menu\n\
mouse-2: Show help for minor mode\n\
mouse-3: Toggle minor modes"
local-map ,mode-line-minor-mode-keymap)
(propertize "%n" 'help-echo "mouse-2: Remove narrowing from buffer"
'mouse-face 'mode-line-highlight
'local-map (make-mode-line-mouse-map
'mouse-2 #'mode-line-widen))
" )"
(propertize "%]" 'help-echo recursive-edit-help-echo)
" "))
"Mode line construct for displaying minor modes.")
(defgroup header-info nil
"Display information in the header line."
:group 'tools)
(defcustom header-info-header-line-format
(list " "
'(:eval (let ((name (buffer-name)))
(cond ((not buffer-file-truename)
;; (propertize name 'face 'bold)
mode-line-buffer-identification
)
((equal name (file-name-nondirectory buffer-file-truename))
(concat
;; (propertize (f-filename buffer-file-truename) 'face 'bold)
(format-mode-line mode-line-buffer-identification)
" "
(f-dirname buffer-file-truename)
"/…" ))
(t
(concat (propertize name 'face 'bold)
" "
buffer-file-truename)))))
;; Right aligned
'(:eval (let* ((right-text (format-mode-line mode-line-major-mode)))
(concat (propertize
" " 'display
`((space :align-to (- (+ right right-fringe right-margin)
,(+ 3 (string-width right-text))))))
right-text))))
"`header-line-format' to use in `header-info-mode'."
:group 'header-info
:type '(list))
(defcustom header-info-mode-line-format
`("%e"
(:eval (window-numbering-get-number-string))
mode-line-front-space
mode-line-mule-info
mode-line-client
mode-line-modified
mode-line-remote
mode-line-frame-identification
;; mode-line-buffer-identification
" "
mode-line-position
(vc-mode vc-mode)
" "
,mode-line-minor-modes
;; mode-line-modes
mode-line-misc-info
mode-line-end-spaces
)
"`mode-line-format' to use in `header-info-mode'."
:group 'header-info
:type '(list))
(defun turn-on-header-info-mode ()
(setq header-info-old-header-line header-line-format
header-line-format header-info-header-line-format)
(setq header-info-old-mode-line mode-line-format
mode-line-format header-info-mode-line-format))
(defun turn-off-header-info-mode ()
(setq header-line-format header-info-old-header-line)
(setq mode-line-format header-info-old-mode-line))
(define-minor-mode header-info-mode
"Minor mode to show file information in the header line."
nil
nil
nil
(if header-info-mode
(turn-on-header-info-mode)
(turn-off-header-info-mode)))
(define-globalized-minor-mode global-header-info-mode
header-info-mode turn-on-header-info-mode)
(provide 'header-info)
;;; header-info.el ends here
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