157 lines
6.1 KiB
EmacsLisp
157 lines
6.1 KiB
EmacsLisp
;;; al-scheme.el --- Additional functionality for `scheme-mode'
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;; Copyright © 2015–2017 Alex Kost
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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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;;; Code:
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(defvar al/scheme-imenu-generic-expression
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`((nil
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,(rx bol "(define"
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(zero-or-one "*")
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(zero-or-one "-public")
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(one-or-more space)
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(zero-or-one "(")
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(group (one-or-more (or word (syntax symbol)))))
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1)
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("Methods"
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,(rx bol "(define-"
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(or "generic" "method" "accessor")
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(one-or-more space)
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(zero-or-one "(")
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(group (one-or-more (or word (syntax symbol)))))
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1)
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("Classes"
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,(rx bol "(define-class"
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(one-or-more space)
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(zero-or-one "(")
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(group (one-or-more (or word (syntax symbol)))))
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1)
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("Records"
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,(rx bol "(define-record-type"
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(zero-or-one "*")
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(one-or-more space)
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(group (one-or-more (or word (syntax symbol)))))
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1)
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("Conditions"
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,(rx bol "(define-condition-type"
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(one-or-more space)
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(group (one-or-more (or word (syntax symbol)))))
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1)
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("Modules"
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,(rx bol "(define-module"
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(one-or-more space)
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(group "(" (one-or-more any) ")"))
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1)
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("Macros"
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,(rx bol "("
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(or (and "defmacro"
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(zero-or-one "*")
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(zero-or-one "-public"))
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"define-macro" "define-syntax" "define-syntax-rule")
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(one-or-more space)
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(zero-or-one "(")
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(group (one-or-more (or word (syntax symbol)))))
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1))
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"Improved substitution for `scheme-imenu-generic-expression'.")
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(defvar calculate-lisp-indent-last-sexp)
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;; The following code of `al/scheme-indent-function' originates from
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;; <http://www.netris.org/~mhw/scheme-indent-function.el>.
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(defun al/scheme-indent-function (indent-point state)
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"Scheme mode function for the value of the variable `lisp-indent-function'.
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This function is the same as `scheme-indent-function' except it
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indents property lists properly and names starting with 'default'."
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(let ((normal-indent (current-column)))
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(goto-char (1+ (elt state 1)))
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(parse-partial-sexp (point) calculate-lisp-indent-last-sexp 0 t)
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(if (and (elt state 2)
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(not (looking-at "\\sw\\|\\s_")))
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;; car of form doesn't seem to be a symbol
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(progn
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(if (not (> (save-excursion (forward-line 1) (point))
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calculate-lisp-indent-last-sexp))
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(progn (goto-char calculate-lisp-indent-last-sexp)
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(beginning-of-line)
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(parse-partial-sexp (point)
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calculate-lisp-indent-last-sexp 0 t)))
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;; Indent under the list or under the first sexp on the same
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;; line as calculate-lisp-indent-last-sexp. Note that first
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;; thing on that line has to be complete sexp since we are
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;; inside the innermost containing sexp.
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(backward-prefix-chars)
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(current-column))
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(let ((function (buffer-substring (point)
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(progn (forward-sexp 1) (point))))
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method)
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(setq method (or (get (intern-soft function) 'scheme-indent-function)
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(get (intern-soft function) 'scheme-indent-hook)))
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(cond ((or (eq method 'defun)
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(and (null method)
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(> (length function) 3)
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;; The original regexp is "\\`def" but it will
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;; mess indentation with such names as
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;; 'default-...'.
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(string-match "\\`define" function)))
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(lisp-indent-defform state indent-point))
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;; This next cond clause is the only change -mhw
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((and (null method)
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(> (length function) 1)
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;; The '#' in '#:' seems to get lost, not sure why
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(string-match "\\`:" function))
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(let ((lisp-body-indent 1))
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(lisp-indent-defform state indent-point)))
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((integerp method)
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(lisp-indent-specform method state
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indent-point normal-indent))
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(method
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(funcall method state indent-point normal-indent)))))))
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;;; Docstrings highlighting
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;; Although `scheme-mode' has all the functionality to highlight
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;; docstrings properly (with `font-lock-doc-face', not with
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;; `font-lock-string-face'!), it doesn't do it. The only missing thing
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;; needed to fix it, is setting `font-lock-syntactic-face-function'.
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;; XXX This is definitely an Emacs bug, and I should report about it! I
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;; think it was introduced by
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;; <http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=0a5cfeeecb9e1038f9df3b34b61b797e56213a7b>.
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;; Another miss is that "scheme.el" contains "docstring rules" only for
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;; `define' and `lambda*', while there are other things to highlight:
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(put 'define* 'scheme-doc-string-elt 2)
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(put 'lambda* 'scheme-doc-string-elt 2)
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(put 'case-lambda 'scheme-doc-string-elt 1)
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(put 'case-lambda* 'scheme-doc-string-elt 1)
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(put 'define-syntax-rule 'scheme-doc-string-elt 2)
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(put 'syntax-rules 'scheme-doc-string-elt 2)
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(defun al/scheme-fix-docstring-font-lock ()
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"Fix highlighting of the Scheme docstrings.
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This function is intended to be added to `scheme-mode-hook'."
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(setq-local font-lock-syntactic-face-function
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'lisp-font-lock-syntactic-face-function))
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(provide 'patch-scheme)
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;; From: https://gitlab.com/alezost-config/emacs/blob/master/utils/al-scheme.el
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;;; al-scheme.el ends here
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