;;; recipe-mode.el --- major mode for foodtool's recipe files  -*- lexical-binding: t; -*-

;; Copyright (C) 2021  

;; Author:  <gramanas@EYE>
;; Keywords: files, data

;; 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 <https://www.gnu.org/licenses/>.

;;; Commentary:

;; 

;;; Code:

(eval-when-compile
  (require 'rx))

(setq recipe-highlights
      '(
        ("^ *#+.*$"                              . 'font-lock-comment-delimiter-face) ;; comment
        ("^ *@\\(.*\\)$"                         . (1 'font-lock-preprocessor-face)) ;; title
        ("\\[\\(.+?\\)\\]"                       . (1 'font-lock-builtin-face)) ;; duration
        ("= *[[:digit:]/]+\\([ [:graph:]]+?\\)$" . (1 'font-lock-builtin-face)) ;; quantity measurements
        ("^\\(.+?\\)=.+?$"                       . (1 'font-lock-variable-name-face)) ;; variable in assignment
        ("\\${\\(.+?\\)}"                        . (1 'font-lock-variable-name-face)) ;; variable in ${}
        ("\\$\\([^ {\n]+\\)"                     . (1 'font-lock-variable-name-face)) ;; single word variable
        ("=>\\(.*\\)"                            . (1 'font-lock-variable-name-face)) ;; step result
        ("^[ [:digit:]]*!"                       . 'font-lock-constant-face) ;; include
        ("@\\|-\\|>\\|+\\|=>"                    . 'font-lock-constant-face) ;; symbols
        ("^\\(.+?\\)$"                           . (1 'font-lock-variable-name-face)) ;; variable in assignment (no qty)
        ))

(define-derived-mode recipe-mode prog-mode "rcp"
  "Mode for rcp files
\\{recipe-mode-map}"

  ;;(setq-local font-lock-defaults '(conf-font-lock-keywords nil t nil nil))
  (setq-local font-lock-defaults '(recipe-highlights))
  (setq-local comment-use-syntax nil)
  (setq-local comment-start "#")
  (setq-local parse-sexp-ignore-comments t))

(add-to-list 'auto-mode-alist '("\\.rcp\\'"     . recipe-mode))

(provide 'recipe-mode)
;;; recipe-mode.el ends here