294 lines
9.6 KiB
EmacsLisp
294 lines
9.6 KiB
EmacsLisp
;;; kivy-mode.el --- Emacs major mode for editing Kivy files
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;;
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;; Author: Dean Serenevy <dean@serenevy.net>
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;; Version: 0.1.0
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;;
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;; This document borrowed heavily from yaml-mode.el by Yoshiki Kurihara and
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;; Marshall Vandegrift.
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;;
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;; This file is not part of Emacs
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;; This file is free software; you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by the
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;; Free Software Foundation; version 3.
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;; This file is distributed in the hope that it will be useful, but WITHOUT
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;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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;; more details.
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;; You should have received a copy of the GNU General Public License along
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;; with GNU Emacs; see the file COPYING. If not, write to the Free Software
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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;; USA.
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;;; Installation:
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;; To install, just drop this file into a directory in your `load-path' and
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;; (optionally) byte-compile it. To automatically handle files ending in
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;; '.kv', add something like:
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;;
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;; (require 'kivy-mode)
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;; (add-to-list 'auto-mode-alist '("\\.kv$" . kivy-mode))
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;;
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;; to your .emacs file.
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;;
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;; This mode does not enable electric-indent by default. To get this
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;; behavior, either enable electric-indent-mode globally or enable it only
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;; for kivy buffers using `kivy-mode-hook':
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;;
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;; (add-hook 'kivy-mode-hook
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;; '(lambda ()
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;; (electric-indent-local-mode t)))
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;; User definable variables
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(defgroup kivy nil
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"Support for the kivy user interface definition format"
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:group 'languages
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:prefix "kivy-")
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(defcustom kivy-mode-hook nil
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"*Hook run by `kivy-mode'."
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:type 'hook
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:group 'kivy)
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(defcustom kivy-indent-offset 4
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"*Amount of offset per level of indentation."
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:type 'integer
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:group 'kivy)
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(defcustom kivy-backspace-function 'backward-delete-char-untabify
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"*Function called by `kivy-electric-backspace' when deleting backwards."
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:type 'function
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:group 'kivy)
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(defface kivy-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 kivy files."
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:group 'faces
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:group 'kivy)
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(defcustom kivy-imenu-generic-expression
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'((nil "^\\([<>a-zA-Z_-]+\\):" 1))
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"The imenu regex to parse an outline of the kivy file."
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:type 'string
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:group 'kivy)
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;; Constants
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(defconst kivy-mode-version "0.1.0" "Version of `kivy-mode.'")
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(defconst kivy-blank-line-re "^ *$"
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"Regexp matching a line containing only (valid) whitespace.")
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(defconst kivy-comment-re "\\(?:^\\|\\s-+\\)\\(#.*\\)"
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"Regexp matching a line containing a kivy comment or delimiter.")
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(defconst kivy-directive-re "^\\(?:#:\\)\\(\\w+ +.*\\)"
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"Regexp matching a line containing a kivy directive.")
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(defconst kivy-tag-re "^ *id: *\\([^ \n]+\\)$"
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"Rexexp matching a kivy tag.")
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(defconst kivy-bare-scalar-re
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"\\(?:[^-:,#!\n{\\[ ]\\|[^#!\n{\\[ ]\\S-\\)[^#\n]*?"
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"Rexexp matching a kivy bare scalar.")
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(defconst kivy-hash-key-re
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(concat "^ *"
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"\\(" kivy-bare-scalar-re "\\) *:"
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"\\(?: +\\|$\\)")
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"Regexp matching a single kivy hash key.")
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(defconst kivy-nested-map-re
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(concat ".*: *$")
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"Regexp matching a line beginning a kivy nested structure.")
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(defconst kivy-constant-scalars-re
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(concat "\\(?:^\\|\\(?::\\|-\\|,\\|{\\|\\[\\) +\\) *"
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(regexp-opt
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'("True" "False" "None") t)
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" *$")
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"Regexp matching certain scalar constants in scalar context")
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;; Mode setup
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(defvar kivy-mode-map ()
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"Keymap used in `kivy-mode' buffers.")
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(if kivy-mode-map
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nil
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(setq kivy-mode-map (make-sparse-keymap))
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(define-key kivy-mode-map [backspace] 'kivy-electric-backspace)
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(define-key kivy-mode-map "\C-c<" 'kivy-indent-shift-left)
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(define-key kivy-mode-map "\C-c>" 'kivy-indent-shift-right)
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)
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(defvar kivy-mode-syntax-table nil
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"Syntax table in use in kivy-mode buffers.")
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(if kivy-mode-syntax-table
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nil
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(setq kivy-mode-syntax-table (make-syntax-table))
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(modify-syntax-entry ?\' "\"" kivy-mode-syntax-table)
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(modify-syntax-entry ?\" "\"" kivy-mode-syntax-table)
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(modify-syntax-entry ?# "<" kivy-mode-syntax-table)
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(modify-syntax-entry ?\n ">" kivy-mode-syntax-table)
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(modify-syntax-entry ?\\ "\\" kivy-mode-syntax-table)
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(modify-syntax-entry ?- "_" kivy-mode-syntax-table)
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(modify-syntax-entry ?_ "w" kivy-mode-syntax-table)
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(modify-syntax-entry ?< "." kivy-mode-syntax-table)
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(modify-syntax-entry ?> "." kivy-mode-syntax-table)
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(modify-syntax-entry ?_ "_" kivy-mode-syntax-table)
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)
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;;;###autoload
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(add-to-list 'auto-mode-alist '("\\.kv$" . kivy-mode))
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;;;###autoload
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(define-derived-mode kivy-mode fundamental-mode "kivy"
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"Simple mode to edit kivy.
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\\{kivy-mode-map}"
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(set (make-local-variable 'comment-start) "# ")
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(set (make-local-variable 'comment-start-skip) "#+ *")
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(set (make-local-variable 'indent-line-function) 'kivy-indent-line)
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(set (make-local-variable 'font-lock-defaults)
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'(kivy-font-lock-keywords
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nil nil nil nil
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(font-lock-syntactic-keywords))))
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;; Font-lock support
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(defvar kivy-font-lock-keywords
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(list
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(cons kivy-comment-re '(1 font-lock-comment-face))
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(cons kivy-constant-scalars-re '(1 font-lock-constant-face))
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(cons kivy-tag-re '(1 font-lock-function-name-face))
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(cons kivy-hash-key-re '(1 font-lock-variable-name-face t))
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(cons kivy-directive-re '(1 font-lock-builtin-face))
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'("^[\t]+" 0 'kivy-tab-face t))
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"Additional expressions to highlight in kivy mode.")
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(defvar kivy-font-lock-syntactic-keywords
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(list '())
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"Additional syntax features to highlight in kivy mode.")
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;; Indentation and electric keys
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(defun kivy-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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(forward-line -1)
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(while (and (looking-at kivy-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 (looking-at kivy-nested-map-re) kivy-indent-offset 0)
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)))
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(defun kivy-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 `kivy-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 (kivy-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) kivy-indent-offset) kivy-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 kivy-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 `kivy-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 kivy-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 kivy-indent-offset))
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kivy-indent-offset)
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kivy-indent-offset)))))
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(defun kivy-set-imenu-generic-expression ()
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(make-local-variable 'imenu-generic-expression)
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(make-local-variable 'imenu-create-index-function)
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(setq imenu-create-index-function 'imenu-default-create-index-function)
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(setq imenu-generic-expression kivy-imenu-generic-expression))
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(add-hook 'kivy-mode-hook 'kivy-set-imenu-generic-expression)
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(add-hook 'kivy-mode-hook
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'(lambda ()
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(setq indent-tabs-mode 'nil)))
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(defun kivy-mode-version ()
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"Display version of `kivy-mode'."
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(interactive)
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(message "kivy-mode %s" kivy-mode-version)
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kivy-mode-version)
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(defun kivy-indent-shift-left (start end &optional count)
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"Shift lines contained in region START END by COUNT columns to the left.
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COUNT defaults to `kivy-indent-offset'. If region isn't
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active, the current line is shifted. The shifted region includes
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the lines in which START and END lie. An error is signaled if
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any lines in the region are indented less than COUNT columns."
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(interactive
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(if mark-active
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(list (region-beginning) (region-end) current-prefix-arg)
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(list (line-beginning-position) (line-end-position) current-prefix-arg)))
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(if count
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(setq count (prefix-numeric-value count))
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(setq count kivy-indent-offset))
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(when (> count 0)
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(let ((deactivate-mark nil))
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(save-excursion
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(goto-char start)
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(while (< (point) end)
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(if (and (< (current-indentation) count)
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(not (looking-at "[ \t]*$")))
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(error "Can't shift all lines enough"))
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(forward-line))
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(indent-rigidly start end (- count))))))
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(defun kivy-indent-shift-right (start end &optional count)
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"Shift lines contained in region START END by COUNT columns to the left.
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COUNT defaults to `kivy-indent-offset'. If region isn't
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active, the current line is shifted. The shifted region includes
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the lines in which START and END lie."
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(interactive
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(if mark-active
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(list (region-beginning) (region-end) current-prefix-arg)
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(list (line-beginning-position) (line-end-position) current-prefix-arg)))
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(let ((deactivate-mark nil))
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(if count
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(setq count (prefix-numeric-value count))
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(setq count kivy-indent-offset))
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(indent-rigidly start end count)))
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(provide 'kivy-mode)
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;;; kivy-mode.el ends here
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