Create simple Emacs major mode.

data/meson.el

@@ -0,0 +1,43 @@
+;; command to comment/uncomment text
+(defun meson-comment-dwim (arg)
+  "Comment or uncomment current line or region in a smart way.
+For detail, see `comment-dwim'."
+  (interactive "*P")
+  (require 'newcomment)
+  (let (
+        (comment-start "#") (comment-end "")
+        )
+    (comment-dwim arg)))
+
+;;(setq mymeson-keywords-regex (regex-opt '("if", "endif", "foreach", "endforeach")))
+
+;; keywords for syntax coloring
+(setq meson-keywords
+      `(
+        ( ,(regexp-opt '("if" "endif" "for" "foreach") 'word) . font-lock-keyword-face)
+        )
+      )
+
+;; syntax table
+(defvar meson-syntax-table nil "Syntax table for `meson-mode'.")
+(setq meson-syntax-table
+      (let ((synTable (make-syntax-table)))
+
+        ;; bash style comment: “# …” 
+        (modify-syntax-entry ?# "< b" synTable)
+        (modify-syntax-entry ?\n "> b" synTable)
+
+        synTable))
+
+;; define the major mode.
+(define-derived-mode meson-mode fundamental-mode
+  "meson-mode is a major mode for editing Meson build definition files."
+  :syntax-table meson-syntax-table
+  
+  (setq font-lock-defaults '(meson-keywords))
+  (setq mode-name "meson")
+
+  ;; modify the keymap
+  (define-key meson-mode-map [remap comment-dwim] 'meson-comment-dwim)
+)
+