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+;;; async-bytecomp.el --- Compile elisp files asynchronously -*- lexical-binding: t -*-
+
+;; Copyright (C) 2014-2016 Free Software Foundation, Inc.
+
+;; Authors: John Wiegley <jwiegley@gmail.com>
+;;          Thierry Volpiatto <thierry.volpiatto@gmail.com>
+
+;; Keywords: dired async byte-compile
+;; X-URL: https://github.com/jwiegley/dired-async
+
+;; This program 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 2, or (at
+;; your option) any later version.
+
+;; This program 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 GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+;;
+;;  This package provide the `async-byte-recompile-directory' function
+;;  which allows, as the name says to recompile a directory outside of
+;;  your running emacs.
+;;  The benefit is your files will be compiled in a clean environment without
+;;  the old *.el files loaded.
+;;  Among other things, this fix a bug in package.el which recompile
+;;  the new files in the current environment with the old files loaded, creating
+;;  errors in most packages after upgrades.
+;;
+;;  NB: This package is advicing the function `package--compile'.
+
+;;; Code:
+
+(require 'cl-lib)
+(require 'async)
+
+(defcustom async-bytecomp-allowed-packages
+  '(async helm helm-core helm-ls-git helm-ls-hg magit)
+  "Packages in this list will be compiled asynchronously by `package--compile'.
+All the dependencies of these packages will be compiled async too,
+so no need to add dependencies to this list.
+The value of this variable can also be a list with a single element,
+the symbol `all', in this case packages are always compiled asynchronously."
+  :group 'async
+  :type '(repeat (choice symbol)))
+
+(defvar async-byte-compile-log-file
+  (concat user-emacs-directory "async-bytecomp.log"))
+
+;;;###autoload
+(defun async-byte-recompile-directory (directory &optional quiet)
+  "Compile all *.el files in DIRECTORY asynchronously.
+All *.elc files are systematically deleted before proceeding."
+  (cl-loop with dir = (directory-files directory t "\\.elc\\'")
+           unless dir return nil
+           for f in dir
+           when (file-exists-p f) do (delete-file f))
+  ;; Ensure async is reloaded when async.elc is deleted.
+  ;; This happen when recompiling its own directory.
+  (load "async")
+  (let ((call-back
+         (lambda (&optional _ignore)
+           (if (file-exists-p async-byte-compile-log-file)
+               (let ((buf (get-buffer-create byte-compile-log-buffer))
+                     (n 0))
+                 (with-current-buffer buf
+                   (goto-char (point-max))
+                   (let ((inhibit-read-only t))
+                     (insert-file-contents async-byte-compile-log-file)
+                     (compilation-mode))
+                   (display-buffer buf)
+                   (delete-file async-byte-compile-log-file)
+                   (unless quiet
+                     (save-excursion
+                       (goto-char (point-min))
+                       (while (re-search-forward "^.*:Error:" nil t)
+                         (cl-incf n)))
+                     (if (> n 0)
+                         (message "Failed to compile %d files in directory `%s'" n directory)
+                         (message "Directory `%s' compiled asynchronously with warnings" directory)))))
+               (unless quiet
+                 (message "Directory `%s' compiled asynchronously with success" directory))))))
+    (async-start
+     `(lambda ()
+        (require 'bytecomp)
+        ,(async-inject-variables "\\`\\(load-path\\)\\|byte\\'")
+        (let ((default-directory (file-name-as-directory ,directory))
+              error-data)
+          (add-to-list 'load-path default-directory)
+          (byte-recompile-directory ,directory 0 t)
+          (when (get-buffer byte-compile-log-buffer)
+            (setq error-data (with-current-buffer byte-compile-log-buffer
+                               (buffer-substring-no-properties (point-min) (point-max))))
+            (unless (string= error-data "")
+              (with-temp-file ,async-byte-compile-log-file
+                (erase-buffer)
+                (insert error-data))))))
+     call-back)
+    (unless quiet (message "Started compiling asynchronously directory %s" directory))))
+
+(defvar package-archive-contents)
+(defvar package-alist)
+(declare-function package-desc-reqs "package.el" (cl-x))
+
+(defun async-bytecomp--get-package-deps (pkg &optional only)
+  ;; Same as `package--get-deps' but parse instead `package-archive-contents'
+  ;; because PKG is not already installed and not present in `package-alist'.
+  ;; However fallback to `package-alist' in case PKG no more present
+  ;; in `package-archive-contents' due to modification to `package-archives'.
+  ;; See issue #58.
+  (let* ((pkg-desc (cadr (or (assq pkg package-archive-contents)
+                             (assq pkg package-alist))))
+         (direct-deps (cl-loop for p in (package-desc-reqs pkg-desc)
+                               for name = (car p)
+                               when (or (assq name package-archive-contents)
+                                        (assq name package-alist))
+                               collect name))
+         (indirect-deps (unless (eq only 'direct)
+                          (delete-dups
+                           (cl-loop for p in direct-deps append
+                                    (async-bytecomp--get-package-deps p))))))
+    (cl-case only
+      (direct   direct-deps)
+      (separate (list direct-deps indirect-deps))
+      (indirect indirect-deps)
+      (t        (delete-dups (append direct-deps indirect-deps))))))
+
+(defun async-bytecomp-get-allowed-pkgs ()
+  (when (and async-bytecomp-allowed-packages
+             (listp async-bytecomp-allowed-packages))
+    (if package-archive-contents
+        (cl-loop for p in async-bytecomp-allowed-packages
+                 when (assq p package-archive-contents)
+                 append (async-bytecomp--get-package-deps p) into reqs
+                 finally return
+                 (delete-dups
+                  (append async-bytecomp-allowed-packages reqs)))
+        async-bytecomp-allowed-packages)))
+
+(defadvice package--compile (around byte-compile-async)
+  (let ((cur-package (package-desc-name pkg-desc))
+        (pkg-dir (package-desc-dir pkg-desc)))
+    (if (or (equal async-bytecomp-allowed-packages '(all))
+            (memq cur-package (async-bytecomp-get-allowed-pkgs)))
+        (progn
+          (when (eq cur-package 'async)
+            (fmakunbound 'async-byte-recompile-directory))
+          ;; Add to `load-path' the latest version of async and
+          ;; reload it when reinstalling async.
+          (when (string= cur-package "async")
+            (cl-pushnew pkg-dir load-path)
+            (load "async-bytecomp"))
+          ;; `async-byte-recompile-directory' will add directory
+          ;; as needed to `load-path'.
+          (async-byte-recompile-directory (package-desc-dir pkg-desc) t))
+        ad-do-it)))
+
+;;;###autoload
+(define-minor-mode async-bytecomp-package-mode
+    "Byte compile asynchronously packages installed with package.el.
+Async compilation of packages can be controlled by
+`async-bytecomp-allowed-packages'."
+  :group 'async
+  :global t
+  (if async-bytecomp-package-mode
+      (ad-activate 'package--compile)
+      (ad-deactivate 'package--compile)))
+
+;;;###autoload
+(defun async-byte-compile-file (file)
+  "Byte compile Lisp code FILE asynchronously.
+
+Same as `byte-compile-file' but asynchronous."
+  (interactive "fFile: ")
+  (let ((call-back
+         (lambda (&optional _ignore)
+           (let ((bn (file-name-nondirectory file)))
+             (if (file-exists-p async-byte-compile-log-file)
+                 (let ((buf (get-buffer-create byte-compile-log-buffer))
+                       start)
+                   (with-current-buffer buf
+                     (goto-char (setq start (point-max)))
+                     (let ((inhibit-read-only t))
+                       (insert-file-contents async-byte-compile-log-file)
+                       (compilation-mode))
+                     (display-buffer buf)
+                     (delete-file async-byte-compile-log-file)
+                     (save-excursion
+                       (goto-char start)
+                       (if (re-search-forward "^.*:Error:" nil t)
+                           (message "Failed to compile `%s'" bn)
+                         (message "`%s' compiled asynchronously with warnings" bn)))))
+               (message "`%s' compiled asynchronously with success" bn))))))
+    (async-start
+     `(lambda ()
+        (require 'bytecomp)
+        ,(async-inject-variables "\\`load-path\\'")
+        (let ((default-directory ,(file-name-directory file)))
+          (add-to-list 'load-path default-directory)
+          (byte-compile-file ,file)
+          (when (get-buffer byte-compile-log-buffer)
+            (setq error-data (with-current-buffer byte-compile-log-buffer
+                               (buffer-substring-no-properties (point-min) (point-max))))
+            (unless (string= error-data "")
+              (with-temp-file ,async-byte-compile-log-file
+                (erase-buffer)
+                (insert error-data))))))
+     call-back)))
+
+(provide 'async-bytecomp)
+
+;;; async-bytecomp.el ends here