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;;; acdw-modeline.el -*- lexical-binding: t; coding: utf-8-unix -*-
;; Author: Case Duckworth <acdw@acdw.net>
;; Created: Sometime during Covid-19, 2020
;; Keywords: configuration
;; URL: https://tildegit.org/acdw/emacs

;; This file is NOT part of GNU Emacs.

;;; License:
;; Everyone is permitted to do whatever with this software, without
;; limitation.  This software comes without any warranty whatsoever,
;; but with two pieces of advice:
;; - Don't hurt yourself.
;; - Make good choices.

;;; Commentary:
;; `acdw-modeline' is a dumping ground for extra modeline functions, so they
;; don't clutter up `init.el'.

;;; Code:

(require 'simple-modeline)
(require 'minions)

(defcustom acdw-modeline/word-count-modes
  (mapcar (lambda (m) (cons m nil)) simple-modeline-word-count-modes)
  "Alist of modes to functions that `acdw-modeline/word-count' should dispatch.
If the cdr of the cons cell is nil, use the default function (`count-words').
Otherwise, cdr should be a function that takes two points (see `count-words')."
  :type '(alist :key-type (symbol :tag "Major-Mode")
                :value-type function)
  :group 'simple-modeline)

(defun acdw-modeline/buffer-name ()     ; gonsie
  "Display the buffer name in a face reflecting its modified status."
  (propertize " %b "
              'face
              (if (buffer-modified-p)
                  'font-lock-warning-face
                'font-lock-type-face)
              'help-echo (buffer-file-name)))

(defun acdw-modeline/erc ()
  "ERC indicator for the modeline."
  (when (and (bound-and-true-p erc-track-mode)
             (boundp 'erc-modified-channels-object))
    (format-mode-line erc-modified-channels-object)))

(defun acdw-modeline/god-mode-indicator ()
  "Display an indicator if `god-local-mode' is active."
  (when (bound-and-true-p god-local-mode)
    " Ω"))

(defun acdw-modeline/major-mode ()
  "Displays the current major mode in the mode-line."
  (propertize
   (concat " "
           (or (and (boundp 'delighted-modes)
                    (cadr (assq major-mode delighted-modes)))
               (format-mode-line mode-name)))
   'face 'bold
   'keymap mode-line-major-mode-keymap
   'mouse-face 'mode-line-highlight))

(defun acdw-modeline/minions () ; by me
  "Display a button for `minions-minor-modes-menu'."
  (concat
   " "
   (propertize
    "&"
    'help-echo (format
                "Minor modes menu\nmouse-1: show menu.")
    'local-map (purecopy (simple-modeline-make-mouse-map
                          'mouse-1
                          (lambda (event)
                            (interactive "e")
                            (with-selected-window (posn-window
                                                   (event-start event))
                              (minions-minor-modes-menu)))))
    'mouse-face 'mode-line-highlight)))

(defun acdw-modeline/modified ()        ; modified from `simple-modeline'
  "Displays a color-coded buffer modification/read-only
indicator in the mode-line."
  (if (not (string-match-p "\\*.*\\*" (buffer-name)))
      (let* ((read-only (and buffer-read-only (buffer-file-name)))
             (modified (buffer-modified-p)))
        (propertize
         (concat " "
                 (cond
                  ((derived-mode-p 'special-mode
                                   'lui-mode)
                   "~")
                  (read-only "=")
                  (modified "+")
                  (t "-")))
         'help-echo (format
                     (concat "Buffer is %s and %smodified\n"
                             "mouse-1: Toggle read-only status.")
                     (if read-only "read-only" "writable")
                     (if modified "" "not "))
         'local-map (purecopy (simple-modeline-make-mouse-map
                               'mouse-1
                               (lambda (event)
                                 (interactive "e")
                                 (with-selected-window
                                     (posn-window (event-start event))
                                   (read-only-mode 'toggle)))))
         'mouse-face 'mode-line-highlight))))

(defun acdw-modeline/narrowed ()
  "Display an indication if the buffer is narrowed."
  (when (buffer-narrowed-p)
    (concat
     ""
     (propertize
      "N"
      'help-echo (format "%s\n%s"
                         "Buffer is narrowed"
                         "mouse-2: widen buffer.")
      'local-map (purecopy (simple-modeline-make-mouse-map
                            'mouse-2 #'mode-line-widen))
      'mouse-face 'mode-line-highlight))))

(defun acdw-modeline/position ()
  "Displays the current cursor position in the mode-line.

Unlike `simple-modeline-segment-position', this changes the first
character from '+' to '-' if the region goes 'backward' -- that
is, if point < mark."
  `((line-number-mode
     ((column-number-mode
       (column-number-indicator-zero-based
        (8 " %l:%c")
        (8 " %l:%C"))
       (5 " L%l")))
     ((column-number-mode
       (column-number-indicator-zero-based
        (5 " C%c")
        (5 " C%C")))))
    ,(if (region-active-p)
         (propertize (format "%s%s"
                             (if (and (mark)
                                      (< (point) (mark)))
                                 "-"
                               "+")
                             (apply #'+ (mapcar
                                         (lambda (pos)
                                           (- (cdr pos)
                                              (car pos)))
                                         (region-bounds))))
                     'font-lock-face 'font-lock-variable-name-face))))

(defun acdw-modeline/text-scale ()
  "Display the text scaling from the modeline, if scaled."
  ;; adapted from https://github.com/seagle0128/doom-modeline
  (when (and (boundp 'text-scale-mode-amount)
             (/= text-scale-mode-amount 0))
    (format
     (if (> text-scale-mode-amount 0)
         " (%+d)"
       " (%-d)")
     text-scale-mode-amount)))

(defun acdw-modeline/track ()
  "Display `tracking-mode' information."
  (when tracking-mode
    tracking-mode-line-buffers))

(defun acdw-modeline/vc-branch ()
  "Display the version control branch of the current buffer in the modeline."
  ;; from https://www.gonsie.com/blorg/modeline.html, from Doom
  (if-let ((backend (vc-backend buffer-file-name)))
      (substring vc-mode (+ (if (eq backend 'Hg) 2 3) 2))))

(defun acdw-modeline/wc ()
  "Display current `wc-buffer-stats'."
  (when (bound-and-true-p wc-mode)
    (or wc-buffer-stats "[w]")))

(defun acdw-modeline/winum ()
  "Show the `winum' number of the current window in the modeline.
Only shows if there is more than one window."
  (when (and (bound-and-true-p winum-mode)
             (> winum--window-count 1))
    (format winum-format (winum-get-number-string))))

(defun acdw-modeline/word-count ()
  "Display a buffer word count, depending on the major mode.
Uses `acdw-modeline/word-count-modes' to determine which function to use."
  (when-let ((modefun
              (assoc major-mode acdw-modeline/word-count-modes #'equal)))
    (let* ((fn (or (cdr modefun)
                   #'count-words))
           (r (region-active-p))
           (min (if r (region-beginning) (point-min)))
           (max (if r (region-end) (point-max))))
      (format " %s%dW" (if r "+" "") (funcall fn min max)))))

(provide 'acdw-modeline)