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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)

(defcustom +modeline-default-spacer " "
  "Default spacer to use for modeline elements.
All modeline elements take an optional argument, `spacer', which
will default to this string.")

;;; Combinators

(defun +modeline-concat (segments &optional separator)
  "Concatenate multiple `simple-modeline'-style SEGMENTS.
SEGMENTS is a list of either modeline segment-functions (see
`simple-modeline' functions for an example of types of
functions), though it can also contain cons cells of the
form (SEGMENT . PREDICATE).

Segments are separated from each other using SEPARATOR, which
defaults to a \" \".  space.  Only segments that evaluate to a
non-trivial string (that is, a string not equal to \"\") will be
separated, for a cleaner look.

This function makes a lambda, so you can throw it straight into
`simple-modeline-segments'."
  (setq separator (or separator +modeline-default-spacer))
  (lambda ()
    (apply #'concat
           (let (this-sep result-list)
                          (dolist (segment segments)
                            (push (funcall (or (car-safe segment) segment)
                                           this-sep)
                                  result-list)
                            (if (or (cdr-safe segment)
                                    (and (car result-list)
                                         (not (equal (car result-list) ""))))
                                (setq this-sep separator)
                              (setq this-sep nil)))
                          (unless (seq-some #'null result-list)
                            (push +modeline-default-spacer result-list))
                          (nreverse result-list)))))

;;; Modeline segments

(defun +modeline-buffer-name (&optional spacer)         ; gonsie
  "Display the buffer name."
  (concat (or spacer +modeline-default-spacer)
          (propertize
           (+string-align (buffer-name) 20 :ellipsis nil)
           '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 (&optional spacer)
  "Display a button for `minions-minor-modes-menu'."
  (concat (or spacer +modeline-default-spacer)
          (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 (&optional spacer)
  "Display the current `major-mode'."
  (concat (or spacer +modeline-default-spacer)
          (propertize (+string-truncate (format-mode-line mode-name) 16)
                      'face 'bold
                      'keymap mode-line-major-mode-keymap
                      'help-echo (concat (format-mode-line mode-name)
                                         " mode\nmouse-1: show menu.")
                      '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 (&optional spacer) ; 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 (or spacer +modeline-default-spacer)
            (propertize (or icon "")
                        'mouse-face 'mode-line-highlight))))

(defun +modeline-buffer-modes (&optional spacer)
  "Display various buffer-specific stuff cleanly."
  ;; This is clunky and should probably be improved.
  (concat (+modeline-reading-mode)
          (+modeline-narrowed (when reading-mode ","))))

(defun +modeline-narrowed (&optional spacer)
  "Display an indication that the buffer is narrowed."
  (when (buffer-narrowed-p)
    (concat (or spacer +modeline-default-spacer)
            (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))
                        'face 'font-lock-doc-face
                        'mouse-face 'mode-line-highlight))))

(defun +modeline-reading-mode (&optional spacer)
  "Display an indication that the buffer is in `reading-mode'."
  (when reading-mode
    (concat (or spacer +modeline-default-spacer)
            (propertize
             (concat "R" (when (bound-and-true-p +eww-readable-p) "w"))
             'help-echo (format "%s\n%s"
                                "Buffer is in reading-mode."
                                "mouse-2: disable reading-mode.")
             'local-map (purecopy
                         (simple-modeline-make-mouse-map
                          'mouse-2 (lambda (ev)
                                     (interactive "e")
                                     (with-selected-window
                                         (posn-window
                                          (event-start ev))
                                       (reading-mode -1)
                                       (force-mode-line-update)))))
             'face 'font-lock-doc-face
             '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-file-percentage (&optional spacer)
  "Display the position in the current file."
  `(,(or spacer +modeline-default-spacer)
    (:propertize (file-percentage-mode
                  (" " (-3 "%p") "%%"))
                 font-lock-face font-lock-comment-face)))

(define-minor-mode region-indicator-mode
  "Toggle the region indicator in the mode line."
  :init-value t :global t :group 'mode-line)

(defun +modeline-region (&optional spacer)
  "Display an indicator if the region is active."
  (when (and region-indicator-mode
             (region-active-p))
    (list
     (format "%s%6s"
             (or spacer +modeline-default-spacer)
             (propertize (format "%s%d"
                                 (if (and (< (point) (mark))) "-" "+")
                                 (apply '+ (mapcar (lambda (pos)
                                                     (- (cdr pos)
                                                        (car pos)))
                                                   (region-bounds))))
                         'font-lock-face 'font-lock-variable-name-face)))))

(defun +modeline-line-column (&optional spacer) ; adapted from `simple-modeline'
  "Display the current cursor line and column depending on modes."
  (let ((sep "|") (before " [") (after "]"))
    `(,(or spacer +modeline-default-spacer)
      (:propertize (line-number-mode
                    ((column-number-mode
                      (column-number-indicator-zero-based
                       ,(concat before "%3l" sep "%2c" after)
                       ,(concat before "%3l" sep "%2C" after))
                      ,(concat before "%3l" sep "" after)))
                    ((column-number-mode
                      (column-number-indicator-zero-based
                       ,(concat before sep "%2c" after)
                       ,(concat before sep "%2C" after)))))
                   font-lock-face font-lock-comment-face))))

(defun +modeline-position (&optional _)
  "Display the current cursor position.
See `line-number-mode', `column-number-mode', `file-percentage-mode'"
  (append (+modeline-line-column)
          (+modeline-region)
          (+modeline-file-percentage)))

(defun +modeline-vc (&optional spacer)
  "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 (or spacer +modeline-default-spacer)
              (substring vc-mode (+ (if (eq backend 'Hg) 2 3) 2)))))

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

(defun +modeline-anzu (&optional spacer)
  "Display `anzu--update-mode-line'."
  (concat (or spacer +modeline-default-spacer)
          (anzu--update-mode-line)))

(defun +modeline-text-scale (&optional spacer)
  "Display text scaling level."
  ;; 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) "%s(%+d)" "%s(%-d)")
            (or spacer +modeline-default-spacer)
            text-scale-mode-amount)))

(defun +modeline-ace-window-display (&optional spacer)
  "Display `ace-window-display-mode' information in the modeline."
  (when (and +ace-window-display-mode
             ace-window-mode)
    (concat (or spacer +modeline-default-spacer)
            (window-parameter (selected-window) 'ace-window-path))))

(defun +modeline-god-mode (&optional spacer)
  "Display an icon when `god-mode' is active."
  (when (and (boundp 'god-local-mode) god-local-mode)
    (concat (or spacer +modeline-default-spacer)
            (propertize "Ω"
                        'help-echo (concat "God mode is active."
                                           "\nmouse-1: exit God mode.")
                        'local-map (purecopy
                                    (simple-modeline-make-mouse-map
                                     'mouse-1 (lambda (e)
                                                (interactive "e")
                                                (with-selected-window
                                                    (posn-window
                                                     (event-start ev))
                                                  (god-local-mode -1)
                                                  (force-mode-line-update)))))
                        'mouse-face 'mode-line-highlight))))

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