Add a copy of ssass-mode.el
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;;; ssass-mode.el --- Edit Sass without a Turing Machine
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;; Copyright 2017 Adam Niederer
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;; Author: Adam Niederer <adam.niederer@gmail.com>
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;; URL: http://github.com/AdamNiederer/ssass-mode
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;; Version: 0.2.0
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;; Keywords: languages sass
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;; Package-Requires: ((emacs "24.3"))
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This mode is a clone of sass-mode which works in mmm-mode and doesn't
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;; indent things as eagerly. Syntax highlighting is provided with
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;; `font-lock-mode'.
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;;
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;; Exported names start with "ssass-"; private names start with
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;; "ssass--".
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;;; Code:
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(defgroup ssass nil
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"Major mode for Sass files"
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:prefix "ssass-"
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:group 'languages
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:link '(url-link :tag "Github" "https://github.com/AdamNiederer/ssass-mode")
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:link '(emacs-commentary-link :tag "Commentary" "ssass-mode"))
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(defconst ssass-id-regex
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"#[a-z][A-Za-z0-9\-]+")
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(defconst ssass-class-regex
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"\\.[a-z][A-Za-z0-9\-]+")
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(defconst ssass-pseudoselector-regex
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"::?[A-Za-z0-9\-]+")
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(defconst ssass-key-regex
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"^\s+[a-z\-]+:")
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(defconst ssass-directive-noindent-regex
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"@\\(include\\|extend\\|import\\|warn\\|debug\\|error\\)"
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"Matches all directives which do not require indentation.")
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(defconst ssass-variable-regex
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"\$[A-Za-z0-9\-]+")
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(defconst ssass-variable-assignment-regex
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(concat ssass-variable-regex ":"))
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(defconst ssass-builtin-regex
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"@[A-Za-z]+")
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(defconst ssass-comment-regex
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"^\s+/[/*].*") ; TODO: Make better or use syntax table
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(defconst ssass-function-regex
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"\\([A-Za-z\-]+?\\)\\((.*)\\)")
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(defconst ssass-keywords
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'("and" "or" "not" "in" "from" "to" "through"))
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(defconst ssass-control-directives
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'("@if" "@else" "@each" "@for"))
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(defconst ssass-function-directives
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'("@function" "@return"))
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(defconst ssass-mixin-directives
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'("@mixin" "@include"))
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(defconst ssass-constants
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'("true" "false" "null"))
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(defconst ssass-bang-regex
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"![a-z][A-Za-z0-9]+")
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(defcustom ssass-tab-width 2
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"Tab width for ‘ssass-mode’."
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:group 'ssass
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:type 'integer)
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(defcustom ssass-indent-blanks t
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"Whether to indent blank lines."
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:group 'ssass
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:type 'boolean)
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(defcustom ssass-compiler "sassc"
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"Sass compiler for `ssass-eval-region' and `ssass-eval-buffer'."
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:group 'ssass
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:type 'string)
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(defcustom ssass-opt "--sass"
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"Options for `ssass-compiler'.
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Use --sass for sassc, and --indented-syntax for node-sass."
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:group 'ssass
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:type 'string)
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(defcustom ssass-color-keys nil
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"(TODO) Whether to color proprty names."
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:group 'ssass
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:type 'boolean)
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(defconst ssass-font-lock-keywords
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`((,ssass-id-regex . (0 font-lock-keyword-face))
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(,ssass-class-regex . (0 font-lock-type-face))
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(,ssass-key-regex . (0 font-lock-variable-name-face))
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(,ssass-function-regex . (1 font-lock-function-name-face))
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(,ssass-builtin-regex . (0 font-lock-builtin-face))
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(,ssass-pseudoselector-regex . (0 font-lock-function-name-face))
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(,ssass-variable-regex . (0 font-lock-variable-name-face))
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(,ssass-bang-regex . (0 font-lock-warning-face))
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(,(regexp-opt ssass-keywords 'words) . font-lock-keyword-face)
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(,(regexp-opt ssass-control-directives 'words) . font-lock-keyword-face)
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(,(regexp-opt ssass-function-directives 'words) . font-lock-keyword-face)
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(,(regexp-opt ssass-constants 'words) . font-lock-constant-face))
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"List of Font Lock keywords.")
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(defvar ssass-mode-map
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(let ((map (make-keymap)))
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(define-key map (kbd "<backtab>") 'ssass-dedent)
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(define-key map (kbd "C-c C-c") 'ssass-eval-buffer)
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(define-key map (kbd "C-c C-r") 'ssass-eval-region)
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map)
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"Keymap for ‘ssass-mode’.")
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(defun ssass--selector-p (line)
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"Return whether LINE is a selector."
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(not (or (string-empty-p line)
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(string-match-p ssass-key-regex line)
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(string-match-p ssass-variable-assignment-regex line)
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(string-match-p ssass-directive-noindent-regex line)
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(string-match-p ssass-comment-regex line))))
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(defun ssass--goto-last-anchor-line ()
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"Move point to the line of the last selector, or the beginning of the buffer."
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(forward-line -1)
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(while (not (or (equal (point-min) (point-at-bol))
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(ssass--selector-p (buffer-substring (point-at-bol) (point-at-eol)))))
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(forward-line -1)))
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(defun ssass--last-anchor-line-indent-level ()
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"Return the number of spaces indenting the line of the last selector."
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(save-excursion
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(ssass--goto-last-anchor-line)
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(ssass--indent-level)))
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(defun ssass--indent-level ()
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"Return the number of spaces indenting the current line."
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(- (save-excursion
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(back-to-indentation)
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(current-column))
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(save-excursion
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(beginning-of-line)
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(current-column))))
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(defun ssass--whitespace-p (line)
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"Return whether the line at offset from point LINE consists solely of whitespace."
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(save-excursion
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(forward-line line)
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(string-match-p "^[[:space:]]*$" (buffer-substring (point-at-bol) (point-at-eol)))))
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(defun ssass--comma-before-p ()
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"Return whether the previous line has a comma at its end."
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(save-excursion
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(forward-line -1)
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(string-match-p ",\\s-*$" (buffer-substring (point-at-bol) (point-at-eol)))))
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(defun ssass--no-anchor-line-p ()
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"Return whether there is no proper selector or keyword above this line."
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(save-excursion
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(ssass--goto-last-anchor-line)
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(not (ssass--selector-p (buffer-substring (point-at-bol) (point-at-eol))))))
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(defun ssass-indent ()
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"Indent the current line."
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(interactive)
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(indent-line-to
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(cond
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((and (not ssass-indent-blanks) (ssass--whitespace-p 0)) 0)
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((ssass--whitespace-p -1) 0)
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((ssass--no-anchor-line-p) 0)
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((ssass--comma-before-p) (ssass--last-anchor-line-indent-level))
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(t (+ ssass-tab-width (ssass--last-anchor-line-indent-level))))))
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(defun ssass-dedent ()
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"Remove one level of indentation from the current line."
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(interactive)
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(indent-line-to (max 0 (- (ssass--indent-level) ssass-tab-width))))
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(defun ssass-eval-file (&optional filename)
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"Run the given file through sass, and display the output in another window.
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If FILENAME is nil, it will open the current buffer's file"
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(interactive)
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(when (buffer-live-p (get-buffer "*sass*"))
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(kill-buffer "*sass*"))
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(start-process "sass" "*sass*" ssass-compiler ssass-opt (or filename (buffer-file-name)))
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(switch-to-buffer-other-window "*sass*")
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(special-mode))
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(defun ssass-eval-region (beg end)
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"Run the region from BEG to END through sass, and display the output in another window."
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(interactive "r")
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(let ((tmp-file (make-temp-file "sass-eval" nil ".sass")))
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(write-region beg end tmp-file nil nil nil nil)
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(ssass-eval-file tmp-file)
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(delete-file tmp-file)) )
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(defun ssass-eval-buffer ()
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"Run the current buffer through sass, and display the output in another window."
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(interactive)
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(ssass-eval-region (point-min) (point-max)))
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;;;###autoload
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(define-derived-mode ssass-mode prog-mode "Ssass"
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"Major mode for Sass"
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(setq-local electric-indent-mode nil)
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(setq-local comment-start "//")
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(setq-local comment-start-skip "\\(//+\\|/\\*+\\)\\s *")
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(set (make-local-variable 'tab-width) ssass-tab-width)
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(set (make-local-variable 'indent-line-function) 'ssass-indent)
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(font-lock-add-keywords nil ssass-font-lock-keywords)
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(modify-syntax-entry ?/ ". 124" ssass-mode-syntax-table)
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(modify-syntax-entry ?* ". 23b" ssass-mode-syntax-table)
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(modify-syntax-entry ?\n ">" ssass-mode-syntax-table))
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(provide 'ssass-mode)
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;;; ssass-mode.el ends here
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