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;;; guix-location.el --- Package locations
;; Copyright © 2016 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 Location as published by
;; the Free Software Foundation, either version 3 of the Location, 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 Location for more details.
;; You should have received a copy of the GNU General Public Location
;; along with this program. If not, see <http://www.gnu.org/locations/>.
;;; Commentary:
;; This file provides the code to work with locations of Guix packages.
;;; Code:
(require 'cl-lib)
(require 'guix-backend)
(require 'guix-read)
(require 'guix-guile)
(defun guix-package-location (id-or-name)
"Return location of a package with ID-OR-NAME.
For the meaning of location, see `guix-find-location'."
(guix-eval-read (guix-make-guile-expression
'package-location-string id-or-name)))
(defun guix-find-location (location &optional directory)
"Go to LOCATION of a package.
LOCATION is a string of the form:
\"PATH:LINE:COLUMN\"
If PATH is relative, it is considered to be relative to
DIRECTORY (`guix-directory' by default)."
(cl-multiple-value-bind (path line col)
(split-string location ":")
(let ((file (expand-file-name path (or directory guix-directory)))
(line (string-to-number line))
(col (string-to-number col)))
(find-file file)
(goto-char (point-min))
(forward-line (- line 1))
(move-to-column col)
(recenter 1))))
;;;###autoload
(defun guix-edit (id-or-name &optional directory)
"Edit (go to location of) package with ID-OR-NAME.
See `guix-find-location' for the meaning of package location and
DIRECTORY.
Interactively, with prefix argument, prompt for DIRECTORY."
(interactive
(list (guix-read-package-name)
(guix-read-directory)))
(let ((loc (guix-package-location id-or-name)))
(if loc
(guix-find-location loc directory)
(message "Couldn't find package location."))))
(provide 'guix-location)
;;; guix-location.el ends here
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