Added CMake stuff.

init.el

@@ -1,5 +1,5 @@
 ;;; init.el --- tastytea's Emacs init file.
-;; Time-stamp: <2019-07-29T13:00:38+00:00>
+;; Time-stamp: <2019-08-01T18:47:22+00:00>
 
 ;;; Commentary:
 ;; I am using this file with Emacs 26, but most of it will probably work with
@@ -422,7 +422,32 @@ With argument, do this that many times."
     (cmake-ide-cmake-opts "")           ; Use the already configured options.
     :config
     (cmake-ide-setup))
-) ; unless slow-computer
+  ) ; unless slow-computer
+
+
+;; Highlighting and indentation for CMake.
+(use-package cmake-mode
+  ;; The CMake ebuild installs the mode.
+  :unless (string-match-p "gentoo" operating-system-release)
+  :mode
+  ("CMakeLists\\.txt\\'" . cmake-mode)
+  ("\\.cmake\\'" . cmake-mode)
+  )
+
+;; ;; Doesn't work, find bug later.
+;; ;; Advanced highlighting for CMake.
+;; (use-package cmake-font-lock
+;;   :after cmake-mode
+;;   :hook
+;;   (cmake-mode . 'cmake-font-lock-activate)
+;;   )
+
+;; CMake reference.
+(use-package eldoc-cmake
+  :after cmake-mode
+  :hook
+  (cmake-mode . eldoc-cmake-enable)
+  )
 
 ;; GUI for gdb and other debuggers.
 (use-package realgud