;;; 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)

(defun acdw-modeline/buffer-name ()     ; gonsie
  (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 (boundp 'erc-modified-channels-object)
    (format-mode-line erc-modified-channels-object)))

(defun acdw-modeline/god-mode-indicator ()
  (when (bound-and-true-p god-local-mode)
    " God"))

(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
         (if read-only " =" (if modified " +" " -"))
         '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/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/text-scale ()
  ;; 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/vc-branch ()
  ;; 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/winum ()
  (when (and (bound-and-true-p winum-mode)
             (> winum--window-count 1))
    (format winum-format (winum-get-number-string))))

(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/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))
          (min (if (region-active-p) (region-beginning) (point-min)))
          (max (if (region-active-p) (region-end) (point-max))))
      (format "%dW" (funcall fn min max)))))

(provide 'acdw-modeline)