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;;; guix-guile.el --- Auxiliary tools for working with guile code -*- lexical-binding: t -*-
;; Copyright © 2015 Alex Kost <alezost@gmail.com>
;; This file is part of GNU Guix.
;; GNU Guix is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Guix is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This file provides functions for parsing guile code, making guile
;; expressions, etc.
;;; Code:
(require 'geiser-guile)
(defvar guix-guile-definition-regexp
(rx bol "(define"
(zero-or-one "*")
(zero-or-one "-public")
(one-or-more space)
(zero-or-one "(")
(group (one-or-more (or word (syntax symbol)))))
"Regexp used to find the guile definition.")
(defun guix-guile-current-definition ()
"Return string with name of the current top-level guile definition."
(save-excursion
(beginning-of-defun)
(if (looking-at guix-guile-definition-regexp)
(match-string-no-properties 1)
(error "Couldn't find the current definition"))))
(defun guix-guile-current-module ()
"Return a string with the current guile module.
Return nil, if current buffer does not define a module."
;; Modified version of `geiser-guile--get-module'.
(save-excursion
(geiser-syntax--pop-to-top)
(when (or (re-search-backward geiser-guile--module-re nil t)
(looking-at geiser-guile--library-re)
(re-search-forward geiser-guile--module-re nil t))
(match-string-no-properties 1))))
(defun guix-guile-boolean (arg)
"Return a string with guile boolean value.
Transform elisp ARG (nil or non-nil) to the guile boolean (#f or #t)."
(concat "#" (prin1-to-string (if arg 't 'f))))
(defun guix-guile-keyword-regexp (keyword)
"Return regexp to find guile KEYWORD."
(format "(\\(%s\\)\\_>" keyword))
(defun guix-guile-make-call-expression (proc &rest args)
"Return \"(PROC ARGS ...)\" string.
PROC and ARGS should be strings."
(format "(%s %s)"
proc
(mapconcat #'identity args " ")))
(defun guix-make-guile-expression (fun &rest args)
"Return string containing a guile expression for calling FUN with ARGS."
(format "(%S %s)" fun
(mapconcat
(lambda (arg)
(cond
((null arg) "'()")
((or (eq arg t)
;; An ugly hack to separate 'false' from nil.
(equal arg 'f)
(keywordp arg))
(concat "#" (prin1-to-string arg t)))
((or (symbolp arg) (listp arg))
(concat "'" (prin1-to-string arg)))
(t (prin1-to-string arg))))
args
" ")))
(provide 'guix-guile)
;;; guix-guile.el ends here
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