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;;; mode-icons.el --- Show icons for modes -*- lexical-binding: t; -*-

;; Copyright (C) 2013  Tom Willemse

;; Author: Tom Willemse <tom@ryuslash.org>
;; Keywords: multimedia
;; Version: 0.1.0
;; URL: http://ryuslash.org/projects/mode-icons.html

;; 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/>.

;;; Commentary:

;; This package provides a globalized minor mode that replaces the
;; major mode name in your mode-line and places like Ibuffer with an
;; icon.  Currently the following programming modes are supported,
;; along with some other modes:
;;
;; - CSS
;; - Coffee
;; - Emacs-Lisp
;; - HTML
;; - Haml
;; - JavaScript
;; - Lisp
;; - nXML
;; - PHP
;; - Python
;; - Ruby
;; - Sass/Scss
;; - Scheme
;; - Shell-script
;; - Slim
;; - Snippet
;; - Web
;; - Yaml
;;
;; To enable this minor mode add the following line to your init file:
;;
;;     (mode-icons-mode)

;;; Code:
(defgroup mode-icons nil
  "Provide icons for major modes."
  :group 'editing-basics
  :group 'convenience)

(defconst mode-icons--directory
  (if load-file-name
      (file-name-directory load-file-name)
    default-directory)
  "Where mode-icons was loaded from.")

(defun mode-icons-get-icon-file (icon)
  "Get the location of ICON.

ICON should be a file name with extension.  The result is the
absolute path to ICON."
  (concat mode-icons--directory "/icons/" icon))

(defcustom mode-icons
  '(("CSS" "css" xpm)
    ("Coffee" "coffee" xpm)
    ("Compilation" "compile" xpm)
    ("Emacs-Lisp" "emacs" xpm)
    ("HTML" "html" xpm)
    ("Haml" "haml" xpm)
    ("Image[imagemagick]" "svg" xpm)
    ("Inf-Ruby" "infruby" xpm)
    ("JavaScript" "js" xpm)
    ("Lisp" "cl" xpm)
    ("nXML" "xml" xpm)
    ("Org" "org" xpm)
    ("PHP" "php" xpm)
    ("PHP/l" "php" xpm)
    ("Projectile Rails Server" "rails" xpm)
    ("Python" "python" xpm)
    ("Ruby" "ruby" xpm)
    ("ESS[S]" "R" xpm)
    ("iESS" "R" xpm)
    ("SCSS" "sass" xpm)
    ("Sass" "sass" xpm)
    ("Scheme" "scheme" xpm)
    ("Shell-script" "bash" xpm)
    ("Slim" "slim" xpm)
    ("Snippet" "yas" xpm)
    ("Term" "term" xpm)
    ("Web" "html" xpm)
    ("XML" "xml" xpm)
    ("YAML" "yaml" xpm)
    ("YASnippet" "yas" xpm)
    (" yas" "yas" xpm)
    (" hs" "hs" xpm)
    ("\\(ElDoc\\|Anzu\\|SP\\|Guide\\|PgLn\\|Golden\\|Undo-Tree\\|Ergo.*\\|,\\)" nil nil))
  "Icons for major and minor modes.

Each specificatioun is a list with the first element being the
name of the major mode.  The second the name of the icon file,
without the extension.  And the third being the type of icon."
  :type '(repeat
          (list (string :tag "Regular Expression")
                (choice
                 (string :tag "Icon Name")
                 (const :tag "Suppress" nil))
                (choice
                 (const :tag "text" nil)
                 (const :tag "png" png)
                 (const :tag "gif" gif)
                 (const :tag "jpeg" jpeg)
                 (const :tag "xbm" xbm)
                 (const :tag "xpm" xpm))))
  :group 'mode-icons)

(defun mode-icons-get-icon-display (icon type)
  "Get the value for the display property of ICON having TYPE.

ICON should be a string naming the file of the icon, without its
extension.  Type should be a symbol designating the file type for
the icon."
  (let ((icon-path (mode-icons-get-icon-file
                    (concat icon "." (symbol-name type)))))
    `(image :type ,type :file ,icon-path :ascent center)))

(defcustom mode-icons-minor-mode-base-text-properties
  '('help-echo 'rm--help-echo
               'mouse-face 'mode-line-highlight
               'local-map mode-line-minor-mode-keymap)
  "List of text propeties to apply to every minor mode."
  :type '(repeat sexp)
  :group 'mode-icons)

(defvar mode-icons-powerline-p nil)
(defun mode-icons-need-update-p ()
  "Determine if the mode-icons need an update"
  (not (or (and (boundp 'rich-minority-mode) rich-minority-mode)
           (member 'sml/pos-id-separator mode-line-format)
           (string-match-p "powerline" (prin1-to-string mode-line-format)))))

(defun mode-icons-propertize-mode (mode icon-spec)
  "Propertize MODE with ICON-SPEC.

MODE should be a string, the name of the mode to propertize.
ICON-SPEC should be a specification from `mode-icons'."
  (cond
   ((not (nth 1 icon-spec)) "")
   (t (propertize mode 'display (mode-icons-get-icon-display (nth 1 icon-spec) (nth 2 icon-spec))))))

(defun mode-icons-get-icon-spec (mode)
  "Get icon spec based on regular expression."
  (catch 'found-mode
    (dolist (item mode-icons)
      (when (string-match-p (car item) mode)
        (throw 'found-mode item)))
    nil))

(defun mode-icons-get-mode-icon (mode)
  "Get the icon for MODE, if there is one."
  (let* ((mode-name (format-mode-line mode))
         (icon-spec (mode-icons-get-icon-spec mode-name)))
    (if icon-spec
        (mode-icons-propertize-mode mode-name icon-spec)
      mode-name)))

(defvar mode-icons-cached-mode-name nil
  "Cached mode name to restore when disabling mode-icons.")

(defun mode-icons-set-mode-icon (mode)
  "Set the icon for MODE."
  (unless mode-icons-cached-mode-name
    (set (make-local-variable 'mode-icons-cached-mode-name)
         mode-name)
    (setq mode-name (mode-icons-get-mode-icon mode))))

(defun mode-icons-major-mode-icons-undo ()
  "Undo the mode-name changes"
  (dolist (b (buffer-list))
    (with-current-buffer b
      (when mode-icons-cached-mode-name
        (setq mode-name mode-icons-cached-mode-name
              mode-icons-cached-mode-name nil)))))

(defun mode-icons-major-mode-icons ()
  "Apply mode name changes on all buffers."
  (dolist (b (buffer-list))
    (with-current-buffer b
      (mode-icons-set-current-mode-icon))))

(defun mode-icons-set-current-mode-icon ()
  "Set the icon for the current major mode."
  (mode-icons-set-mode-icon mode-name))

(defvar mode-icons-set-minor-mode-icon-alist nil)

(defun mode-icons-set-minor-mode-icon-undo ()
  (let (minor)
    (dolist (mode mode-icons-set-minor-mode-icon-alist)
      (setq minor (assq (car mode) minor-mode-alist))
      (when minor
        (setcdr minor (cdr mode)))))
  (setq mode-icons-set-minor-mode-icon-alist nil)
  (force-mode-line-update))

(defcustom mode-icons-separate-images-with-spaces t
  "Separate minor-mode icons with spaces."
  :type 'boolean
  :group 'mode-icons)

(defun mode-icons-set-minor-mode-icon ()
  "Set the icon for the minor modes."
  (let (icon-spec mode-name minor)
    (dolist (mode minor-mode-alist)
      (unless (assq (car mode) mode-icons-set-minor-mode-icon-alist)
        (setq mode-name (format-mode-line mode)
              icon-spec (mode-icons-get-icon-spec mode-name))
        (when icon-spec
          (setq minor (assq (car mode) minor-mode-alist))
          (when minor
            (or (assq (car mode) mode-icons-set-minor-mode-icon-alist)
                (push (copy-sequence minor) mode-icons-set-minor-mode-icon-alist))
            (setq mode-name (replace-regexp-in-string "^ " "" mode-name)
                  mode-name (mode-icons-propertize-mode mode-name icon-spec))
            (if (string= "" mode-name)
                (setcdr minor (list ""))
              (setcdr minor (list (concat (or (and mode-icons-separate-images-with-spaces " ") "")
                                          mode-name)))))))))
  (force-mode-line-update))

(defun mode-icons--generate-minor-mode-list ()
  "Extracts all rich strings necessary for the minor mode list."
  (delete " " (delete "" (mapcar (lambda(mode)
                                   (concat " " (eval `(propertize ,mode ,@mode-icons-minor-mode-base-text-properties))))
                                 (split-string (format-mode-line minor-mode-alist))))))

;; Based on rich-minority by Artur Malabarba
(defvar mode-icons--backup-construct nil)
(defvar mode-icons--mode-line-construct
  '(:eval (mode-icons--generate-minor-mode-list))
  "Construct used to replace `minor-mode-alist'.")

(defun mode-icons-fix (&optional enable)
  "Fix mode-icons."
  (if enable
      (let ((place (or (member 'minor-mode-alist mode-line-modes)
                       (cl-member-if
                        (lambda (x) (and (listp x)
                                    (equal (car x) :propertize)
                                    (equal (cadr x) '("" minor-mode-alist))))
                        mode-line-modes))))
        (when place
          (setq mode-icons--backup-construct (car place))
          (setcar place mode-icons--mode-line-con