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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: 0.2.1
;; URL: http://ryuslash.org/projects/mode-icons.html
;; Package-Requires: ((emacs "24") (cl-lib "0.5"))

;; 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:

(require 'cl-lib)

(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))

(defmacro mode-icons-define-font (font)
  "Define FONT for `mode-icons'."
  `(progn
     (defvar ,(intern (format "mode-icons-font-spec-%s" font))
       (font-spec :name ,(format "%s" font)))
     (defvar ,(intern (format "mode-icons-font-%s" font))
       (find-font ,(intern (format "mode-icons-font-spec-%s" font))))))

(mode-icons-define-font "github-octicons")
(mode-icons-define-font "font-mfizz")
(mode-icons-define-font "FontAwesome")

(defcustom mode-icons
  `(("CSS" "css" xpm)
    ("Coffee" "coffee" xpm)
    ("Compilation" "compile" xpm)
    ("Emacs-Lisp" "emacs" xpm)
    ("Lisp Interaction" "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)
    ("Markdown" ,(make-string 1 #xf0c9) github-octicons)
    ("Scala" ,(make-string 1 #xf15b) font-mfizz)
    ("Magit" ,(make-string 1 #xf1d2) FontAwesome)
    (" Pulls" ,(make-string 1 #xf092) FontAwesome)
    ("Zip-Archive" ,(make-string 1 #xf1c6) FontAwesome)
    ("ARev" ,(make-string 1 #xf021) FontAwesome)
    ("Calc\\(ulator\\)?" ,(make-string 1 #xf1ec) FontAwesome)
    ("Debug.*" ,(make-string 1 #xf188) FontAwesome)
    ("Calendar" ,(make-string 1 #xf073) FontAwesome)
    ("Help" ,(make-string 1 #xf059) FontAwesome)
    ("C/l" ,(make-string 1 #xf107) font-mfizz)
    ("\\`Go\\'" "go" xpm)
    (" Rbow" "rainbow" xpm)
    ;; Diminished modes
    ("\\(ElDoc\\|Anzu\\|SP\\|Guide\\|PgLn\\|Golden\\|Undo-Tree\\|Ergo.*\\|,\\|Isearch\\|Ind\\|Fly\\)" 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 "Octicons" github-octicons)
                 (const :tag "Fizzed" font-mfizz)
                 (const :tag "Font Awesome" FontAwesome)
                 (const :tag "png" png)
                 (const :tag "gif" gif)
                 (const :tag "jpeg" jpeg)
		 (const :tag "jpg" jpg)
                 (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 ,(or (and (eq type 'jpg) 'jpeg) type) :file ,icon-path :ascent center)))

(defcustom mode-icons-minor-mode-base-text-properties
  '('help-echo nil
               '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)

(defcustom mode-icons-major-mode-base-text-properties
  '('help-echo "Major mode\nmouse-1: Display major mode menu\nmouse-2: Show help for major mode\nmouse-3: Toggle minor modes"
               'mouse-face 'mode-line-highlight
               'local-map mode-line-major-mode-keymap)
  "List of text propeties to apply to every major 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)))))

(defvar mode-icons-font-register-alist nil
  "Alist of characters supported.")

(defun mode-icons-supported-font-p (char font &optional dont-register)
  "Determine if the CHAR is supported in FONT.
When DONT-REGISTER is non-nil, don't register the font.
Otherwise, register the font for use in the mode-line and
everywhere else."
  (when (and (or (integerp char)
                 (and (stringp char) (= 1 (length char))))
             (boundp (intern (format "mode-icons-font-spec-%s" font)))
             (symbol-value (intern (format "mode-icons-font-spec-%s" font))))
    (let* ((char (or (and (integerp char) char)
                     (and (stringp char) (= 1 (length char))
                          (aref (vconcat char) 0))))
           (found-char-p (assoc char mode-icons-font-register-alist))
           (char-font-p (and found-char-p (eq (cdr found-char-p) font))))
      (cond
       (char-font-p t)
       (found-char-p t)
       (t ;; not yet registered.
        (set-fontset-font t (cons char char) (symbol-value (intern (format "mode-icons-font-spec-%s" font))))
        (push (cons char font) mode-icons-font-register-alist)
        t)))))

(defun mode-icons-supported-p (icon-spec)
  "Determine if ICON-SPEC is suppored on your system."
  (or
   (and (or (eq (nth 2 icon-spec) nil) (eq (nth 1 icon-spec) nil)) t)
   (