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;;; guix-emacs.el --- Emacs packages installed with Guix
;; Copyright © 2014, 2015, 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 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 auxiliary code for working with Emacs packages
;; installed with Guix.
;;; Code:
(require 'cl-lib)
(unless (require 'guix-profiles nil t)
(defvar guix-user-profile (expand-file-name "~/.guix-profile")))
(defcustom guix-package-enable-at-startup t
"If non-nil, activate Emacs packages installed in a user profile.
Set this variable to nil before requiring `guix-emacs' file to
avoid loading autoloads of Emacs packages installed in
`guix-user-profile'."
:type 'boolean
:group 'guix)
(defcustom guix-emacs-activate-after-operation t
"Activate Emacs packages after installing.
If nil, do not load autoloads of the Emacs packages after
they are successfully installed."
:type 'boolean
:group 'guix)
(defvar guix-emacs-autoloads nil
"List of the last loaded Emacs autoloads.")
(defvar guix-emacs-autoloads-regexp
(rx (group (* any) "-autoloads")
".el" (zero-or-one "c") string-end)
"Regexp to match Emacs 'autoloads' file.")
(defun guix-emacs-directory (&optional profile)
"Return directory with Emacs packages installed in PROFILE.
If PROFILE is nil, use `guix-user-profile'."
(expand-file-name "share/emacs/site-lisp"
(or profile guix-user-profile)))
(defun guix-emacs-find-autoloads-in-directory (directory)
"Return a list of Emacs 'autoloads' files in DIRECTORY.
The files in the list do not have extensions (.el, .elc)."
(cl-remove-duplicates
(delq nil
(mapcar (lambda (file)
(when (string-match guix-emacs-autoloads-regexp file)
(match-string 1 file)))
(directory-files directory 'full-name nil 'no-sort)))
:test #'string=))
(defun guix-emacs-subdirs (directory)
"Return list of DIRECTORY subdirectories."
(cl-remove-if (lambda (file)
(or (string-match-p (rx "/." string-end) file)
(string-match-p (rx "/.." string-end) file)
(not (file-directory-p file))))
(directory-files directory 'full-name nil 'no-sort)))
(defun guix-emacs-find-autoloads (&optional profile)
"Return list of autoloads of Emacs packages installed in PROFILE.
If PROFILE is nil, use `guix-user-profile'.
Return nil if there are no emacs packages installed in PROFILE."
(let ((elisp-root-dir (guix-emacs-directory profile)))
(if (file-directory-p elisp-root-dir)
(let ((elisp-pkgs-dir (expand-file-name "guix.d" elisp-root-dir))
(root-autoloads (guix-emacs-find-autoloads-in-directory
elisp-root-dir)))
(if (file-directory-p elisp-pkgs-dir)
(let ((pkgs-autoloads
(cl-mapcan #'guix-emacs-find-autoloads-in-directory
(guix-emacs-subdirs elisp-pkgs-dir))))
(append root-autoloads pkgs-autoloads))
root-autoloads))
(message "Directory '%s' does not exist." elisp-root-dir)
nil)))
;;;###autoload
(defun guix-emacs-load-autoloads (&optional profile)
"Load autoloads for Emacs packages installed in PROFILE.
If PROFILE is nil, use `guix-user-profile'.
Add autoloads directories to `load-path'."
(interactive (list (if (fboundp 'guix-profile-prompt)
(funcall 'guix-profile-prompt)
guix-user-profile)))
(let* ((autoloads (guix-emacs-find-autoloads profile))
(new-autoloads (cl-nset-difference autoloads
guix-emacs-autoloads
:test #'string=)))
(dolist (file new-autoloads)
(cl-pushnew (directory-file-name (file-name-directory file))
load-path
:test #'string=)
(load file 'noerror))
(setq guix-emacs-autoloads
(append new-autoloads guix-emacs-autoloads))))
(defun guix-emacs-load-autoloads-maybe ()
"Load autoloads for Emacs packages if needed.
See `guix-emacs-activate-after-operation' for details."
(and guix-emacs-activate-after-operation
;; FIXME Since a user can work with a non-current profile (using
;; C-u before `guix-search-by-name' and other commands), emacs
;; packages can be installed to another profile, and the
;; following code will not work (i.e., the autoloads for this
;; profile will not be loaded).
(guix-emacs-load-autoloads guix-current-profile)))
(when guix-package-enable-at-startup
(add-to-list 'load-path (guix-emacs-directory))
(guix-emacs-load-autoloads))
(provide 'guix-emacs)
;;; guix-emacs.el ends here
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