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nano-modeline.el
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;; -*- lexical-binding: t -*-
;; -------------------------------------------------------------------
;; GNU Emacs / N Λ N O - Emacs made simple
;; Copyright (C) 2020 - N Λ N O developers
;;
;; 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 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/>
;; -------------------------------------------------------------------
;;
;; Nano mode line format:
;;
;; [ status | name (primary) secondary | item1 | item2 ]
;;
;; -------------------------------------------------------------------
(require 'subr-x)
;; -------------------------------------------------------------------
(defun vc-branch ()
(if vc-mode
(let ((backend (vc-backend buffer-file-name)))
(concat "#" (substring-no-properties vc-mode
(+ (if (eq backend 'Hg) 2 3) 2)))) nil))
(defun nano-mode-name ()
(if (listp mode-name) (car mode-name) mode-name))
;; From https://amitp.blogspot.com/2011/08/emacs-custom-mode-line.html
;; ---------------------------------------------------------------------
(defun shorten-directory (dir max-length)
"Show up to `max-length' characters of a directory name `dir'."
(let ((path (reverse (split-string (abbreviate-file-name dir) "/")))
(output ""))
(when (and path (equal "" (car path)))
(setq path (cdr path)))
(while (and path (< (length output) (- max-length 4)))
(setq output (concat (car path) "/" output))
(setq path (cdr path)))
(when path
(setq output (concat "…/" output)))
output))
;; -------------------------------------------------------------------
(defun nano-modeline-compose (status name primary secondary)
"Compose a string with provided information"
(let* ((char-width (window-font-width nil 'header-line))
(window (get-buffer-window (current-buffer)))
(space-up +0.15)
(space-down -0.20)
(prefix (cond ((string= status "RO")
(propertize (if (window-dedicated-p)" -- " " RO ")
'face 'nano-face-header-popout))
((string= status "**")
(propertize (if (window-dedicated-p)" -- " " ** ")
'face 'nano-face-header-critical))
((string= status "RW")
(propertize (if (window-dedicated-p)" -- " " RW ")
'face 'nano-face-header-faded))
(t (propertize status 'face 'nano-face-header-popout))))
(left (concat
(propertize " " 'face 'nano-face-header-default
'display `(raise ,space-up))
(propertize name 'face 'nano-face-header-strong)
(propertize " " 'face 'nano-face-header-default
'display `(raise ,space-down))
(propertize primary 'face 'nano-face-header-default)))
(right (concat secondary " "))
(available-width (- (window-total-width)
(length prefix) (length left) (length right)
(/ (window-right-divider-width) char-width)))
(available-width (max 1 available-width)))
(concat prefix
left
(propertize (make-string available-width ?\ )
'face 'nano-face-header-default)
(propertize right 'face `(:inherit nano-face-header-default
:foreground ,nano-color-faded)))))
;; ---------------------------------------------------------------------
(defun nano-modeline-mu4e-dashboard-mode-p ()
(bound-and-true-p mu4e-dashboard-mode))
(defun nano-modeline-mu4e-dashboard-mode ()
(nano-modeline-compose (nano-modeline-status)
"Mail"
(nano-modeline-mu4e-context)
(format "%d messages" (plist-get mu4e~server-props :doccount))
))
;; ---------------------------------------------------------------------
;; since the EIN library itself is constantly re-rendering the notebook, and thus
;; re-setting the header-line-format, we cannot use the nano-modeline function to set
;; the header format in a notebook buffer. Fortunately, EIN exposes the
;; ein:header-line-format variable for just this purpose.
(with-eval-after-load 'ein
(defun nano-modeline-ein-notebook-mode ()
(let ((buffer-name (format-mode-line "%b")))
(nano-modeline-compose (if (ein:notebook-modified-p) "**" "RW")
buffer-name
""
(ein:header-line))))
(setq ein:header-line-format '((:eval (nano-modeline-ein-notebook-mode)))))
;; ---------------------------------------------------------------------
(defun nano-modeline-elfeed-search-mode-p ()
(derived-mode-p 'elfeed-search-mode))
(defun nano-modeline-elfeed-search-mode ()
(nano-modeline-compose (nano-modeline-status)
"Elfeed"
(concat "(" (elfeed-search--header) ")")
""))
;; Elfeed (regular header)
(with-eval-after-load 'elfeed
(defun elfeed-setup-header ()
(setq header-line-format (default-value 'header-line-format)))
(setq elfeed-search-header-function #'elfeed-setup-header))
;; ---------------------------------------------------------------------
(defun nano-modeline-elfeed-show-mode-p ()
(derived-mode-p 'elfeed-show-mode))
(defun nano-modeline-elfeed-show-mode ()
(let* ((title (elfeed-entry-title elfeed-show-entry))
(tags (elfeed-entry-tags elfeed-show-entry))
(tags-str (mapconcat #'symbol-name tags ", "))
(date (seconds-to-time (elfeed-entry-date elfeed-show-entry)))
(feed (elfeed-entry-feed elfeed-show-entry))
(feed-title (plist-get (elfeed-feed-meta feed) :title))
(entry-author (elfeed-meta elfeed-show-entry :author)))
(nano-modeline-compose (nano-modeline-status)
(s-truncate 40 title "…")
(concat "(" tags-str ")")
feed-title)))
;; ---------------------------------------------------------------------
(defun nano-modeline-calendar-mode-p ()
(derived-mode-p 'calendar-mode))
(defun nano-modeline-calendar-mode () "")
;; Calendar (no header, only overline)
(with-eval-after-load 'calendar
(defun calendar-setup-header ()
(setq header-line-format "")
(face-remap-add-relative
'header-line `(:overline ,(face-foreground 'default)
:height 0.5
:background ,(face-background 'default))))
(add-hook 'calendar-initial-window-hook #'calendar-setup-header)
;; From https://emacs.stackexchange.com/questions/45650
(add-to-list 'display-buffer-alist
`(,(rx string-start "*Calendar*" string-end)
(display-buffer-below-selected))))
;; ---------------------------------------------------------------------
(defun nano-modeline-org-capture-mode-p ()
(bound-and-true-p org-capture-mode))
(defun nano-modeline-org-capture-mode ()
(nano-modeline-compose (nano-modeline-status)
"Capture"
"(org)"
""))
(with-eval-after-load 'org-capture
(defun org-capture-turn-off-header-line ()
(setq-local header-line-format (default-value 'header-line-format))
;; (fit-window-to-buffer nil nil 8)
;; (face-remap-add-relative 'header-line '(:background "#ffffff"))
(message nil))
(add-hook 'org-capture-mode-hook
#'org-capture-turn-off-header-line))
;; ---------------------------------------------------------------------
(setq Info-use-header-line nil)
(defun nano-modeline-info-breadcrumbs ()
(let ((nodes (Info-toc-nodes Info-current-file))
(cnode Info-current-node)
(node Info-current-node)
(crumbs ())
(depth Info-breadcrumbs-depth)
line)
(while (> depth 0)
(setq node (nth 1 (assoc node nodes)))
(if node (push node crumbs))
(setq depth (1- depth)))
(setq crumbs (cons "Top" (if (member (pop crumbs) '(nil "Top"))
crumbs (cons nil crumbs))))
(forward-line 1)
(dolist (node crumbs)
(let ((text
(if (not (equal node "Top")) node
(format "%s"
(if (stringp Info-current-file)
(file-name-sans-extension
(file-name-nondirectory Info-current-file))
Info-current-file)))))
(setq line (concat line (if (null line) "" " > ")
(if (null node) "..." text)))))
(if (and cnode (not (equal cnode "Top")))
(setq line (concat line (if (null line) "" " > ") cnode)))
line))
(defun nano-modeline-info-mode-p ()
(derived-mode-p 'Info-mode))
(defun nano-modeline-info-mode ()
(nano-modeline-compose (nano-modeline-status)
"Info"
(concat "("
(nano-modeline-info-breadcrumbs)
")")
""))
;; ---------------------------------------------------------------------
(defun nano-modeline-org-agenda-mode-p ()
(derived-mode-p 'org-agenda-mode))
(defun nano-modeline-org-agenda-mode ()
(nano-modeline-compose (nano-modeline-status)
"Agenda"
""
(format-time-string "%H:%M")))
;; ---------------------------------------------------------------------
(defun nano-modeline-term-mode-p ()
(derived-mode-p 'term-mode))
(defun nano-modeline-vterm-mode-p ()
(derived-mode-p 'vterm-mode))
(defun nano-modeline-term-mode ()
(nano-modeline-compose " >_ "
"Terminal"
(concat "(" shell-file-name ")")
(shorten-directory default-directory 32)))
;; ---------------------------------------------------------------------
(defun nano-modeline-mu4e-main-mode-p ()
(derived-mode-p 'mu4e-main-mode))
(defun nano-modeline-mu4e-main-mode ()
(nano-modeline-compose (nano-modeline-status)
"Mail"
(nano-modeline-mu4e-context)
(format-time-string "%A %d %B %Y, %H:%M")))
;; ---------------------------------------------------------------------
(defun nano-modeline-mu4e-headers-mode-p ()
(derived-mode-p 'mu4e-headers-mode))
(defun nano-modeline-mu4e-headers-mode ()
(nano-modeline-compose (nano-modeline-status)
(mu4e~quote-for-modeline mu4e~headers-last-query)
""
""))
(with-eval-after-load 'mu4e
(defun mu4e~header-line-format () (nano-modeline)))
;; ---------------------------------------------------------------------
(setq mu4e-modeline-max-width 72)
(defun nano-modeline-mu4e-view-mode-p ()
(derived-mode-p 'mu4e-view-mode))
(defun nano-modeline-mu4e-view-mode ()
(let* ((msg (mu4e-message-at-point))
(subject (mu4e-message-field msg :subject))
(from (mu4e~headers-contact-str (mu4e-message-field msg :from)))
(date (mu4e-message-field msg :date)))
(nano-modeline-compose (nano-modeline-status)
(s-truncate 40 subject "…")
""
from)))
(defun nano-modeline-mu4e-view-hook ()
(setq header-line-format "%-")
(face-remap-add-relative 'header-line
'(:background "#ffffff"
:underline nil
:box nil
:height 1.0)))
(add-hook 'mu4e-view-mode-hook #'nano-modeline-mu4e-view-hook)
;; ---------------------------------------------------------------------
(defun nano-modeline-nano-help-mode-p ()
(derived-mode-p 'nano-help-mode))
(defun nano-modeline-nano-help-mode ()
(nano-modeline-compose (nano-modeline-status)
"GNU Emacs / N Λ N O"
"(help)"
""))
;; ---------------------------------------------------------------------
(defun nano-modeline-message-mode-p ()
(derived-mode-p 'message-mode))
(defun nano-modeline-message-mode ()
(nano-modeline-compose (nano-modeline-status)
"Message" "(draft)" ""))
;; ---------------------------------------------------------------------
(setq org-mode-line-string nil)
(with-eval-after-load 'org-clock
(add-hook 'org-clock-out-hook
'(lambda () (setq org-mode-line-string nil)
(force-mode-line-update))))
(defun nano-modeline-org-clock-mode-p ()
org-mode-line-string)
(defun nano-modeline-org-clock-mode ()
(let ((buffer-name (format-mode-line "%b"))
(mode-name (nano-mode-name))
(branch (vc-branch))
(position (format-mode-line "%l:%c")))
(nano-modeline-compose (nano-modeline-status)
buffer-name
(concat "(" mode-name
(if branch (concat ", "
(propertize branch 'face 'italic)))
")" )
org-mode-line-string)))
;; ---------------------------------------------------------------------
(defun nano-modeline-docview-mode-p ()
(derived-mode-p 'doc-view-mode))
(defun nano-modeline-docview-mode ()
(let ((buffer-name (format-mode-line "%b"))
(mode-name (nano-mode-name))
(branch (vc-branch))
(page-number (concat
(number-to-string (doc-view-current-page)) "/"
(or (ignore-errors
(number-to-string (doc-view-last-page-number)))
"???"))))
(nano-modeline-compose
(nano-modeline-status)
buffer-name
(concat "(" mode-name
(if branch (concat ", "
(propertize branch 'face 'italic)))
")" )
page-number)))
;; ---------------------------------------------------------------------
(defun nano-modeline-pdf-view-mode-p ()
(derived-mode-p 'pdf-view-mode))
(defun nano-modeline-pdf-view-mode ()
(let ((buffer-name (format-mode-line "%b"))
(mode-name (nano-mode-name))
(branch (vc-branch))
(page-number (concat
(number-to-string (pdf-view-current-page)) "/"
(or (ignore-errors
(number-to-string (pdf-cache-number-of-pages)))
"???"))))
(nano-modeline-compose
"RW"
buffer-name
(concat "(" mode-name
(if branch (concat ", "
(propertize branch 'face 'italic)))
")" )
page-number)))
;; ---------------------------------------------------------------------
(defun buffer-menu-mode-header-line ()
(face-remap-add-relative
'header-line `(:background ,(face-background 'nano-face-subtle))))
(add-hook 'Buffer-menu-mode-hook
#'buffer-menu-mode-header-line)
;; ---------------------------------------------------------------------
(defun nano-modeline-completion-list-mode-p ()
(derived-mode-p 'completion-list-mode))
(defun nano-modeline-completion-list-mode ()
(let ((buffer-name (format-mode-line "%b"))
(mode-name (nano-mode-name))
(position (format-mode-line "%l:%c")))
(nano-modeline-compose (nano-modeline-status)
buffer-name "" position)))
;; ---------------------------------------------------------------------
(with-eval-after-load 'deft
(defun deft-print-header ()
(force-mode-line-update)
(widget-insert "\n")))
(defun nano-modeline-deft-mode-p ()
(derived-mode-p 'deft-mode))
(defun nano-modeline-deft-mode ()
(let ((prefix " DEFT ")
(primary "Notes")
(filter (if deft-filter-regexp
(deft-whole-filter-regexp) "<filter>"))
(matches (if deft-filter-regexp
(format "%d matches" (length deft-current-files))
(format "%d notes" (length deft-all-files)))))
(nano-modeline-compose " DEFT "
primary filter matches)))
;; ---------------------------------------------------------------------
(defun nano-modeline-prog-mode-p ()
(derived-mode-p 'prog-mode))
(defun nano-modeline-text-mode-p ()
(derived-mode-p 'text-mode))
(defun nano-modeline-default-mode ()
(let ((buffer-name (format-mode-line "%b"))
(mode-name (nano-mode-name))
(branch (vc-branch))
(position (format-mode-line "%l:%c")))
(nano-modeline-compose (nano-modeline-status)
buffer-name
(concat "(" mode-name
(if branch (concat ", "
(propertize branch 'face 'italic)))
")" )
position)))
;; ---------------------------------------------------------------------
(defun nano-modeline-status ()
"Return buffer status: read-only (RO), modified (**) or read-write (RW)"
(let ((read-only buffer-read-only)
(modified (and buffer-file-name (buffer-modified-p))))
(cond (modified "**") (read-only "RO") (t "RW"))))
;; ---------------------------------------------------------------------
(defun nano-modeline-mu4e-context ()
"Return the current mu4e context as a non propertized string."
(if (> (length (mu4e-context-label)) 0)
(concat "(" (substring-no-properties (mu4e-context-label) 1 -1) ")")
"(none)"))
;; ---------------------------------------------------------------------
(defun nano-modeline ()
"Install a header line whose content is dependend on the major mode"
(interactive)
(setq-default header-line-format
'((:eval
(cond ((nano-modeline-prog-mode-p) (nano-modeline-default-mode))
((nano-modeline-message-mode-p) (nano-modeline-message-mode))
((nano-modeline-elfeed-search-mode-p) (nano-modeline-elfeed-search-mode))
((nano-modeline-elfeed-show-mode-p) (nano-modeline-elfeed-show-mode))
((nano-modeline-deft-mode-p) (nano-modeline-deft-mode))
((nano-modeline-info-mode-p) (nano-modeline-info-mode))
((nano-modeline-calendar-mode-p) (nano-modeline-calendar-mode))
((nano-modeline-org-capture-mode-p) (nano-modeline-org-capture-mode))
((nano-modeline-org-agenda-mode-p) (nano-modeline-org-agenda-mode))
((nano-modeline-org-clock-mode-p) (nano-modeline-org-clock-mode))
((nano-modeline-term-mode-p) (nano-modeline-term-mode))
((nano-modeline-vterm-mode-p) (nano-modeline-term-mode))
((nano-modeline-mu4e-dashboard-mode-p) (nano-modeline-mu4e-dashboard-mode))
((nano-modeline-mu4e-main-mode-p) (nano-modeline-mu4e-main-mode))
((nano-modeline-mu4e-headers-mode-p) (nano-modeline-mu4e-headers-mode))
;; ((nano-modeline-mu4e-view-mode-p) (nano-modeline-mu4e-view-mode))
((nano-modeline-text-mode-p) (nano-modeline-default-mode))
((nano-modeline-pdf-view-mode-p) (nano-modeline-pdf-view-mode))
((nano-modeline-docview-mode-p) (nano-modeline-docview-mode))
((nano-modeline-completion-list-mode-p) (nano-modeline-completion-list-mode))
((nano-modeline-nano-help-mode-p) (nano-modeline-nano-help-mode))
(t (nano-modeline-default-mode)))))))
;; ---------------------------------------------------------------------
(defun nano-modeline-update-windows ()
"Modify the mode line depending on the presence of a window below."
(dolist (window (window-list))
(with-selected-window window
(if (or (one-window-p t)
(eq (window-in-direction 'below) (minibuffer-window))
(not (window-in-direction 'below)))
(with-current-buffer (window-buffer window)
(setq mode-line-format (list "")))
;; (setq mode-line-format (list "")))
(with-current-buffer (window-buffer window)
(setq mode-line-format nil)))
;; (if (window-in-direction 'above)
;; (face-remap-add-relative 'header-line '(:overline "#777777"))
;; (face-remap-add-relative 'header-line '(:overline nil)))
)))
(add-hook 'window-configuration-change-hook 'nano-modeline-update-windows)
(setq eshell-status-in-modeline nil)
;; (setq-default mode-line-format (list "%-"))
(setq-default mode-line-format "")
(nano-modeline)
(provide 'nano-modeline)