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;;; +modeline.el --- my modeline customizations -*- lexical-binding: t; -*-

;;; Commentary:

;; `+modeline.el' is kind of a dumping ground for various
;; modeline-related functions.  I probably don't use everything in
;; here.  Credit given where possible.

;;; Code:

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

(defgroup +modeline nil
  "Various customization options for my modeline things."
  :prefix "+modeline-"
  :group 'simple-modeline)

(defun +modeline-buffer-name ()         ; gonsie
  "Display the buffer name."
  (propertize
   (+string-align (buffer-name) 20 :before " " :ellipsis "… ")
   'face 'bold
   'help-echo (or (buffer-file-name)
                  (buffer-name))
   'mouse-face 'mode-line-highlight))

(defcustom +modeline-minions-icon "&"
  "The \"icon\" for `+modeline-minions' button."
  :type 'string)

(defun +modeline-minions ()
  "Display a button for `minions-minor-modes-menu'."
  (concat " "
          (propertize
           +modeline-minions-icon
           'help-echo "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 +modeline-major-mode ()
  "Display the current `major-mode'."
  (concat " "
          (propertize (+string-truncate (format-mode-line mode-name)
                                        12 "…")
                      'face 'bold
                      'keymap mode-line-major-mode-keymap
                      'mouse-face 'mode-line-highlight)))

(defcustom +modeline-modified-icon-alist '((ephemeral . "*")
                                           (readonly . "=")
                                           (modified  . "+")
                                           (special . "~")
                                           (t . "-"))
  "\"Icons\" to display depending on buffer status in modeline.
The CAR of each field is one of `readonly', `modified',
`special', `ephemeral', or t, and the CDR is a string to display
in that mode.

`readonly' is true if the buffer is read-only and visiting a file.
`modified' is true if the buffer is modified.
`special' is true if the buffer is a special-mode or derived buffer.
`ephemeral' is true if the buffer is not visiting a file.
t is the fall-back, shown when nothing else in the alist applies.

The order of elements matters: whichever one matches first is applied."
  :type '(alist :key-type symbol
                :value-type string)
  :options '("readonly" "modified" "special" "t"))

(defcustom +modeline-modified-icon-special-modes '(special-mode)
  "Modes to apply the `special-mode' icon to in the
`+modeline-modified'."
  :type '(repeat function))

(defun +modeline-modified () ; modified from `simple-modeline-status-modified'
  "Display a color-coded \"icon\" indicator for the buffer's status."
  (let* ((icon (catch :icon
                (dolist (cell +modeline-modified-icon-alist)
                  (when (pcase (car cell)
                          ('ephemeral (not (buffer-file-name)))
                          ('readonly buffer-read-only)
                          ('modified (buffer-modified-p))
                          ('special
                           (apply 'derived-mode-p
                                  +modeline-modified-icon-special-modes))
                          ('t t)
                          (_ nil))
                    (throw :icon (cdr cell)))))))
    (concat " "
            (propertize (or icon "")
                        'mouse-face 'mode-line-highlight))))

(defun +modeline-narrowed ()
  "Display an indication that 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))))

(define-minor-mode file-percentage-mode
  "Toggle the percentage display in the mode line (File Percentage Mode)."
  :init-value t :global t :group 'mode-line)

(defun +modeline-position ()            ; adapted from `simple-modeline'
  "Display the current cursor position."
  (list '((line-number-mode
           ((column-number-mode
             (column-number-indicator-zero-based
              (9 " %l:%c")
              (9 " %l:%C"))
             (6 " %l:")))
           ((column-number-mode
             (column-number-indicator-zero-based
              (5 " :%c")
              (5 " :%C"))))))
        '(file-percentage-mode
          ((-3 "%p") "%% "))
        (if (region-active-p)
            (propertize (format "%s%-5d"
                                (if (and (mark) (< (point) (mark))) "-" "+")
                                (apply '+ (mapcar
                                           (lambda (pos)
                                             (- (cdr pos)
                                                (car pos)))
                                           (region-bounds))))
                        'font-lock-face 'font-lock-variable-name-face))))

(defun +modeline-vc ()
  "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)))
      (concat " " (substring vc-mode (+ (if (eq backend 'Hg) 2 3) 2)))))

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

(defun +modeline-anzu ()
  "Display `anzu--update-mode-line'."
  (concat " " (anzu--update-mode-line)))

(provide '+modeline)
;;; +modeline.el ends here