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;;; ninja-mode.el --- Major mode for editing .ninja files -*- lexical-binding: t -*-
;; Package-Requires: ((emacs "24"))
;; Copyright 2011 Google Inc. All Rights Reserved.
;;
;; Licensed under the Apache License, Version 2.0 (the "License");
;; you may not use this file except in compliance with the License.
;; You may obtain a copy of the License at
;;
;; http://www.apache.org/licenses/LICENSE-2.0
;;
;; Unless required by applicable law or agreed to in writing, software
;; distributed under the License is distributed on an "AS IS" BASIS,
;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;; See the License for the specific language governing permissions and
;; limitations under the License.
;;; Commentary:
;; Simple emacs mode for editing .ninja files.
;; Just some syntax highlighting for now.
;;; Code:
(defvar ninja-keywords
`((,(concat "^" (regexp-opt '("rule" "build" "subninja" "include"
"pool" "default")
'words))
. font-lock-keyword-face)
("\\([[:alnum:]_]+\\) =" 1 font-lock-variable-name-face)
;; Variable expansion.
("$[[:alnum:]_]+" . font-lock-variable-name-face)
("${[[:alnum:]._]+}" . font-lock-variable-name-face)
;; Rule names
("rule +\\([[:alnum:]_.-]+\\)" 1 font-lock-function-name-face)
;; Build Statement - highlight the rule used,
;; allow for escaped $,: in outputs.
("build +\\(?:[^:$\n]\\|$[:$]\\)+ *: *\\([[:alnum:]_.-]+\\)"
1 font-lock-function-name-face)))
(defvar ninja-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?\" "." table)
table)
"Syntax table used in `ninja-mode'.")
(defun ninja-syntax-propertize (start end)
(save-match-data
(goto-char start)
(while (search-forward "#" end t)
(let ((match-pos (match-beginning 0)))
(when (and
;; Is it the first non-white character on the line?
(eq match-pos (save-excursion (back-to-indentation) (point)))
(save-excursion
(goto-char (line-end-position 0))
(or
;; If we're continuing the previous line, it's not a
;; comment.
(not (eq ?$ (char-before)))
;; Except if the previous line is a comment as well, as the
;; continuation dollar is ignored then.
(nth 4 (syntax-ppss)))))
(put-text-property match-pos (1+ match-pos) 'syntax-table '(11))
(let ((line-end (line-end-position)))
;; Avoid putting properties past the end of the buffer.
;; Otherwise we get an `args-out-of-range' error.
(unless (= line-end (1+ (buffer-size)))
(put-text-property line-end (1+ line-end) 'syntax-table '(12)))))))))
;;;###autoload
(define-derived-mode ninja-mode prog-mode "ninja"
(set (make-local-variable 'comment-start) "#")
(set (make-local-variable 'parse-sexp-lookup-properties) t)
(set (make-local-variable 'syntax-propertize-function) #'ninja-syntax-propertize)
(setq font-lock-defaults '(ninja-keywords)))
;; Run ninja-mode for files ending in .ninja.
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.ninja$" . ninja-mode))
(provide 'ninja-mode)
;;; ninja-mode.el ends here
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