Added a very basic Sass emacs mode.
git-svn-id: svn://hamptoncatlin.com/haml/trunk@414 7063305b-7217-0410-af8c-cdc13e5119b9
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;;; sass-mode.el -- Major mode for editing Sass files
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;;; Version 0.0.1
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;;; Written by Nathan Weizenbaum
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;;; Because Sass's indentation schema is similar
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;;; to that of YAML and Python, many indentation-related
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;;; functions are similar to those in yaml-mode and python-mode.
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;;; To install, save this somewhere and add the following to your .emacs file:
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;;;
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;;; (add-to-list 'load-path "/path/to/sass-mode.el")
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;;; (require 'sass-mode nil 't)
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;;;
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;;; Code:
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;; User definable variables
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(defgroup sass nil
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"Support for the Sass template language."
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:group 'languages
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:prefix "sass-")
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(defcustom sass-mode-hook nil
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"*Hook run by `sass-mode'."
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:type 'hook
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:group 'sass)
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(defcustom sass-indent-offset 2
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"*Amount of offset per level of indentation."
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:type 'integer
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:group 'sass)
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(defcustom sass-backspace-function 'backward-delete-char-untabify
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"*Function called by `sass-electric-backspace' when deleting backwards."
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:type 'function
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:group 'sass)
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(defface sass-tab-face
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'((((class color)) (:background "red" :foreground "red" :bold t))
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(t (:reverse-video t)))
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"Face to use for highlighting tabs in Sass files."
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:group 'faces
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:group 'sass)
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;; Helper Functions
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(defun string-* (str n)
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"Concatenates a string with itself n times."
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(if (= n 0) ""
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(concat str (string-* str (- n 1)))))
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(defun sre (str)
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"Prepends a Sass-tab-matching regexp to str."
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(concat "^\\(" (string-* " " sass-indent-offset) "\\)*" str))
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;; Constants
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(defconst sass-mode-version "0.0.1" "Version of `sass-mode.'")
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(defconst sass-blank-line-re "^[ \t]*$"
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"Regexp matching a line containing only whitespace.")
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(defconst sass-full-attr-re (sre ":[^ \t]*[ \t]*[^ \t]")
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"Regexp matching a Sass attribute with content.")
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;; Mode setup
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(defvar sass-mode-map ()
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"Keymap used in `sass-mode' buffers.")
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(if sass-mode-map
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nil
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(setq sass-mode-map (make-sparse-keymap))
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(define-key sass-mode-map [backspace] 'sass-electric-backspace)
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(define-key sass-mode-map "\C-?" 'sass-electric-backspace)
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(define-key sass-mode-map "\C-j" 'newline-and-indent))
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(defvar sample-font-lock-keywords
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'(("function \\(\\sw+\\)" (1 font-lock-function-name-face)))
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"Keyword highlighting specification for `sample-mode'.")
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(define-derived-mode sass-mode fundamental-mode "Sass"
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"Simple mode to edit Sass.
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\\{sass-mode-map}"
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(set (make-local-variable 'indent-line-function) 'sass-indent-line)
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(set (make-local-variable 'font-lock-defaults) '(sample-font-lock-keywords)))
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;; Font-lock support
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(defvar sass-font-lock-keywords
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(list
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(cons sass-tag-re '(1 font-lock-function-name-face))
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'("function \\(\\sw+\\)" (1 font-lock-function-name-face))
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'("^[\t]+" 0 'sass-tab-face t))
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"Expressions to highlight in Sass mode.")
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;; Indentation and electric keys
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(defun sass-compute-indentation ()
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"Calculate the maximum sensible indentation for the current line."
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(save-excursion
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(beginning-of-line)
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(if (bobp) 10
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(forward-line -1)
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(while (and (looking-at sass-blank-line-re)
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(> (point) (point-min)))
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(forward-line -1))
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(+ (current-indentation)
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(if (not (looking-at sass-full-attr-re))
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sass-indent-offset 0)))))
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(defun sass-indent-line ()
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"Indent the current line.
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The first time this command is used, the line will be indented to the
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maximum sensible indentation. Each immediately subsequent usage will
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back-dent the line by `sass-indent-offset' spaces. On reaching column
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0, it will cycle back to the maximum sensible indentation."
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(interactive "*")
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(let ((ci (current-indentation))
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(cc (current-column))
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(need (sass-compute-indentation)))
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(save-excursion
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(beginning-of-line)
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(delete-horizontal-space)
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(if (and (equal last-command this-command) (/= ci 0))
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(indent-to (* (/ (- ci 1) sass-indent-offset) sass-indent-offset))
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(indent-to need)))
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(if (< (current-column) (current-indentation))
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(forward-to-indentation 0))))
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(defun sass-electric-backspace (arg)
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"Delete characters or back-dent the current line.
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If invoked following only whitespace on a line, will back-dent to the
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immediately previous multiple of `sass-indent-offset' spaces."
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(interactive "*p")
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(if (or (/= (current-indentation) (current-column)) (bolp))
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(funcall sass-backspace-function arg)
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(let ((ci (current-column)))
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(beginning-of-line)
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(delete-horizontal-space)
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(indent-to (* (/ (- ci (* arg sass-indent-offset))
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sass-indent-offset)
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sass-indent-offset)))))
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;; Setup/Activation
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(defun sass-mode-version ()
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"Diplay version of `sass-mode'."
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(interactive)
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(message "sass-mode %s" sass-mode-version)
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sass-mode-version)
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(provide 'sass-mode)
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(add-to-list 'auto-mode-alist '("\\.sass\\'" . sass-mode))
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;;; sass-mode.el ends here
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