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;;; flycheck-color-mode-line.el --- Change mode line color with Flycheck status -*- lexical-binding: t -*-
;; Copyright (c) 2013 Sylvain Benner <sylvain.benner@gmail.com>
;;
;; Author: Sylvain Benner <sylvain.benner@gmail.com>
;; Keywords: convenience language tools
;; Package-Version: 20171122.707
;; Version: 0.3
;; Package-Requires: ((flycheck "0.15") (dash "1.2") (emacs "24.1"))
;; This file is not part of GNU Emacs.
;; 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:
;; Colorize the mode line according to the Flycheck status.
;;
;; This package provides the `flycheck-color-mode-line-mode' minor mode which
;; changes the color of the mode line according to the status of Flycheck syntax
;; checking.
;;
;; To enable this mode in Flycheck, add it to `flycheck-mode-hook':
;;
;; (add-hook 'flycheck-mode-hook 'flycheck-color-mode-line-mode)
;;
;; Thanks go to:
;; - Thomas Järvstrand (tjarvstrand) for the initial code from the excellent
;; EDTS package
;; - Sebastian Wiesner (lunaryorn) for flycheck and his awesome support.
;;; Code:
(require 'dash)
(require 'flycheck)
(require 'face-remap)
;;;; Customization
(defface flycheck-color-mode-line-error-face
'((t :inherit flycheck-fringe-error))
"Face remapping for the modeline in buffers with Flycheck errors.
This is applied to the face named in `flycheck-color-mode-line-face-to-color'."
:group 'flycheck-faces)
(defface flycheck-color-mode-line-warning-face
'((t :inherit flycheck-fringe-warning))
"Face remapping for the modeline in buffers with only Flycheck warnings.
This is applied to the face named in `flycheck-color-mode-line-face-to-color'."
:group 'flycheck-faces)
(defface flycheck-color-mode-line-info-face
'((t :inherit flycheck-fringe-info))
"Face remapping for the modeline in buffers with only Flycheck info.
This is applied to the face named in `flycheck-color-mode-line-face-to-color'."
:group 'flycheck-faces)
(defface flycheck-color-mode-line-success-face
'((t))
"Face remapping for the modeline in buffers with no Flycheck feedback items.
This is applied to the face named in `flycheck-color-mode-line-face-to-color'.
Customize this to actively mark buffers in which Flycheck has run
but not reported any issues."
:group 'flycheck-faces)
(defcustom flycheck-color-mode-line-show-running t
"When non-nil, apply `flycheck-color-mode-line-running-face' when Flycheck is running."
:type 'boolean)
(put 'flycheck-color-mode-line-show-running 'safe-local-variable 'booleanp)
(defface flycheck-color-mode-line-running-face
'((t :inherit font-lock-comment-face))
"Face remapping for the modeline in buffers where Flycheck is running.
This is applied to the face named in `flycheck-color-mode-line-face-to-color'."
:group 'flycheck-faces)
(defcustom flycheck-color-mode-line-face-to-color
'mode-line
"Symbol identifying which face to remap.
While 'mode-line is the default, you might prefer to modify a
different face, e.g. 'mode-line-buffer-id, 'fringe, 'line-number or 'linum."
:type 'symbol
:group 'flycheck-faces)
;;;; Modeline face remapping
(defvar-local flycheck-color-mode-line-cookie nil
"Cookie for the remapped modeline face.
Used to restore the original mode line face.")
(defun flycheck-color-mode-line-reset ()
"Reset the mode line face."
(when flycheck-color-mode-line-cookie
(face-remap-remove-relative flycheck-color-mode-line-cookie)
(setq flycheck-color-mode-line-cookie nil)))
(defun flycheck-color-mode-line-update (status)
"Update the mode line face according to the Flycheck STATUS."
(let ((face (pcase status
(`finished
(cond
((flycheck-has-current-errors-p 'error)
'flycheck-color-mode-line-error-face)
((flycheck-has-current-errors-p 'warning)
'flycheck-color-mode-line-warning-face)
((flycheck-has-current-errors-p 'info)
'flycheck-color-mode-line-info-face)
(t
'flycheck-color-mode-line-success-face)))
(`running
(when flycheck-color-mode-line-show-running
'flycheck-color-mode-line-running-face)))))
(when face
(flycheck-color-mode-line-reset)
(setq flycheck-color-mode-line-cookie
(face-remap-add-relative flycheck-color-mode-line-face-to-color face)))))
;;;###autoload
(define-minor-mode flycheck-color-mode-line-mode
"Minor mode to color the mode line with the Flycheck status.
When called interactively, toggle
`flycheck-color-mode-line-mode'. With prefix ARG, enable
`flycheck-color-mode-line-mode' if ARG is positive, otherwise
disable it.
When called from Lisp, enable `flycheck-color-mode-line-mode' if ARG is omitted,
nil or positive. If ARG is `toggle', toggle `flycheck-color-mode-line-mode'.
Otherwise behave as if called interactively."
:init-value nil
:keymap nil
:lighter nil
:group 'flycheck
:require 'flycheck-color-mode-line
(cond
(flycheck-color-mode-line-mode
(add-hook 'flycheck-status-changed-functions
#'flycheck-color-mode-line-update nil t)
(flycheck-color-mode-line-update 'unknown))
(:else
(remove-hook 'flycheck-status-changed-functions
#'flycheck-color-mode-line-update t)
(flycheck-color-mode-line-reset))))
;;;###autoload
(custom-add-frequent-value 'flycheck-mode-hook 'flycheck-color-mode-line-mode)
(provide 'flycheck-color-mode-line)
;;; flycheck-color-mode-line.el ends here
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