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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 (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-directories (&optional profile)
"Return the list of directories under PROFILE that contain Emacs packages.
This includes both `share/emacs/site-lisp/guix.d/PACKAGE'
sub-directories and `share/emacs/site-lisp' itself.
If PROFILE is nil, use `guix-user-profile'.
Return nil, if Emacs packages are not installed in PROFILE."
(let ((root-dir (guix-emacs-directory (or profile guix-user-profile))))
(when (file-directory-p root-dir)
(let* ((pkgs-dir (expand-file-name "guix.d" root-dir))
(pkgs-dirs (when (file-directory-p pkgs-dir)
(guix-emacs-subdirs pkgs-dir))))
(cons root-dir pkgs-dirs)))))
;;;###autoload
(defun guix-emacs-autoload-packages (&rest profiles)
"Autoload Emacs packages installed in PROFILES.
If PROFILES are not specified, use `guix-user-profile'.
'Autoload' means add directories with Emacs packages to
`load-path' and load 'autoloads' files matching
`guix-emacs-autoloads-regexp'."
(interactive (list (if (fboundp 'guix-profile-prompt)
(funcall 'guix-profile-prompt)
guix-user-profile)))
(let ((profiles (or profiles
(list guix-user-profile))))
(dolist (profile profiles)
(let ((dirs (guix-emacs-directories profile)))
(when dirs
(let* ((autoloads (cl-mapcan #'guix-emacs-find-autoloads
dirs))
(new-autoloads (cl-nset-difference autoloads
guix-emacs-autoloads
:test #'string=)))
(dolist (dir dirs)
(cl-pushnew (directory-file-name dir)
load-path
:test #'string=))
(dolist (file new-autoloads)
(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-autoload-packages guix-current-profile)))
(when guix-package-enable-at-startup
(guix-emacs-autoload-packages))
(provide 'guix-emacs)
;;; guix-emacs.el ends here
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