143 lines
4.3 KiB
EmacsLisp
143 lines
4.3 KiB
EmacsLisp
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;;; haml-mode.el -- Major mode for editing Haml files
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;;; Version 0.0.1
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;;; Written by Nathan Weizenbaum
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;;; Because Haml'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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;;; Code:
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;; User definable variables
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(defgroup haml nil
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"Support for the Haml template language."
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:group 'languages
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:prefix "haml-")
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(defcustom haml-mode-hook nil
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"*Hook run by `haml-mode'."
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:type 'hook
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:group 'haml)
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(defcustom haml-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 'haml)
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;; Helper Functions
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(defun string-* (str i)
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(if (= i 0) ""
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(concat str (string-* str (- i 1)))))
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(defun hre (str)
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"Prepends a Haml-tab-matching regexp to str."
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(concat "^\\(" (string-* " " haml-indent-offset) "\\)*" str))
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;; Constants
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(defconst haml-mode-version "0.0.1" "Version of `haml-mode.'")
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(defconst haml-blank-line-re "^[ \t]*$"
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"Regexp matching a line containing only whitespace.")
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(defconst haml-tag-re (hre "[%\\.#][^ \t]*\\({.*}\\)?\\(\\[.*\\]\\).?[ \t]*$")
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"Regexp matching a Haml tag.")
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(defconst haml-block-re (hre "[-=].*do[ \t]*\\(|.*|[ \t]*\\)?$")
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"Regexp matching a Ruby block in Haml.")
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(defconst haml-block-cont-re (hre (concat "-[ \t]*"
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(regexp-opt '("else" "elsif"
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"rescue" "ensure"
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"when"))))
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"Regexp matching a continued Ruby block in Haml.")
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(defconst haml-html-comment-re (hre "/\\(\\[.*\\]\\)?[ \t]*$")
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"Regexp matching a Haml HTML comment command.")
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(defconst haml-comment-re (hre "-#[ \t]$")
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"Regexp matching a Haml comment command.")
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(defconst haml-filter-re (hre ":")
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"Regexp matching a Haml filter command.")
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;; Mode setup
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(defvar haml-mode-map ()
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"Keymap used in `haml-mode' buffers.")
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(if haml-mode-map
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nil
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(setq haml-mode-map (make-sparse-keymap))
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(define-key haml-mode-map "\C-j" 'newline-and-indent))
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;(defvar haml-mode-syntax-table nil
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; "Syntax table in use in haml-mode buffers.")
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;(if haml-mode-syntax-table
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; nil
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; (setq haml-mode-syntax-table (make-syntax-table))
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; ...
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; )
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(define-derived-mode haml-mode fundamental-mode "Haml"
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"Simple mode to edit Haml.
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\\{haml-mode-map}"
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(set (make-local-variable 'indent-line-function) 'haml-indent-line))
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; (set (make-local-variable 'font-lock-defaults)
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; '(haml-font-lock-keywords
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; nil nil nil nil
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; (font-lock-syntactic-keywords . haml-font-lock-syntactic-keywords))))
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;; Indentation and electric keys
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(defun haml-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 haml-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 (or (looking-at haml-filter-re)
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(looking-at haml-comment-re)
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(looking-at haml-html-comment-re)
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(looking-at haml-block-cont-re)
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(looking-at haml-tag-re)
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(looking-at haml-block-re))
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haml-indent-offset 0)))))
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(defun haml-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 `haml-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 (haml-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) haml-indent-offset) haml-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 haml-mode-version ()
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"Diplay version of `haml-mode'."
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(interactive)
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(message "haml-mode %s" haml-mode-version)
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haml-mode-version)
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(provide 'haml-mode)
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(add-to-list 'auto-mode-alist '("\\.haml\\'" . haml-mode))
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;;; haml-mode.el ends here
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