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+;;; elpa-mirror.el --- Create local package repository from installed packages
+
+;; Copyright (C) 2014-2020 Chen Bin
+
+;; Author: Chen Bin <chenbin.sh@gmail.com>
+;; URL: http://github.com/redguardtoo/elpa-mirror
+;; Package-Requires: ((emacs "25.1"))
+;; Version: 2.2.2
+;; Keywords: tools
+;;
+;; This file is not part of GNU Emacs.
+
+;;; License:
+
+;; This file is part of elpa-mirror
+;;
+;; elpa-mirror 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.
+;;
+;; elpa-mirror 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 program will create a local package repository by from all
+;; installed packages.
+;;
+;; Please note compile Emacs Lisp file (*.elc) from one version of Emacs
+;; might not work with another version of Emacs.  So you need this program
+;; to compile package from local repository.
+;;
+;; This is the ONLY way to have 100% portable Emacs setup.
+;;
+;; Usage in Emacs,
+;; Run `elpamr-create-mirror-for-installed'.
+;;
+;; CLI program tar is required.  It's bundled with Windows10/Linux/macOS.
+;;
+;; Usage in Shell,
+;;   Emacs --batch -l ~/.emacs.d/init.el
+;;         -l ~/any-directory-you-prefer/elpa-mirror.el \
+;;         --eval='(setq elpamr-default-output-directory "~/myelpa")' \
+;;         --eval='(elpamr-create-mirror-for-installed)
+;;
+;; Use the repository created by elpa-mirror,
+;;   - Add `(setq package-archives '(("myelpa" . "~/myelpa/")))` into ~/.emacs
+;;   - Restart Emacs
+;;
+;; Tips,
+;;   - `elpamr-exclude-packages' excludes packages
+;;
+;;   - `elpamr-tar-command-exclude-patterns' excludes file and directories in
+;;   package directory.
+;;
+;;   - `elpamr-exclude-patterns-filter-function' lets users define a function to
+;;     exclude files and directories per package.
+;;
+;;     Below setup adds directory "bin/" into package "vagrant-tramp".
+;;
+;;     (setq elpamr-exclude-patterns-filter-function
+;;           (lambda (package-dir)
+;;             (let ((patterns elpamr-tar-command-exclude-patterns))
+;;               (when (string-match "vagrant-tramp" package-dir)
+;;                 (setq patterns (remove "*/bin" patterns)))
+;;               patterns)))
+
+;;   - You can also setup repositories on Dropbox and Github.
+;;   See https://github.com/redguardtoo/elpa-mirror for details.
+;;
+
+;;; Code:
+(require 'package)
+
+(defcustom elpamr-default-output-directory nil
+  "The output directory use by `elpamr-create-mirror-for-installed'."
+  :type '(choice directory (const :tags "None" nil))
+  :group 'elpa-mirror)
+
+(defcustom elpamr-exclude-packages nil
+  "Names of excluded packages."
+  :type '(repeat string)
+  :group 'elpa-mirror)
+
+(defcustom elpamr-tar-command-exclude-patterns
+  '("*.elc"
+    "*~"
+    "*autoloads.el"
+    "*.so"
+    "*.dylib"
+    "*.dll"
+    "*/bin"
+    "*/__pycache__")
+  "Exclude patterns passed tar's `--exclude' option.
+
+The patterns use shell glob syntax, not regexp syntax:
+
+* `*' matches any string, including `/'.
+* `?' matches a single character.
+* `[abc]' or `[a-z]' is a character class.
+* `[^a-z]' or `[!a-z]' is a negated character class.
+* `^' and `$' have a special meaning in BSD tar only.
+* Special characters are quoted with `\\'.
+
+The patterns are anchored, meaning that they always start
+matching at the start of the path.  This is done by passing the
+`--anchored' option when running with GNU tar, or pre-pending `^'
+to every pattern when running with BSD tar.
+
+Examples:
+
+* Exclude files/directories that end with `.elc': `*.elc'.
+* Exclude files/directories named `__pycache__': `*/__pycache__'.
+* Exclude `bin' inside the `company' package: `company-*/bin'.
+
+Note that a slash at the start or the end of a pattern will cause
+it to match nothing."
+  :type '(repeat string)
+  :group 'elpa-mirror)
+
+(defcustom elpamr-exclude-patterns-filter-function nil
+  "Filter `elpamr-tar-command-exclude-patterns' before using it per package.
+A function with one parameter which is the package directory.
+It returns the result to replace `elpamr-tar-command-exclude-patterns'."
+  :group 'elpa-mirror
+  :type 'hook)
+
+(defcustom elpamr-tar-executable
+  "tar"
+  "The tar executable used by elpa-mirror.
+It can be BSD tar, but GNU tar is preferred."
+  :type 'string
+  :group 'elpa-mirror)
+
+(defcustom elpamr-finished-hook nil
+  "Hook run when command `elpamr-create-mirror-for-installed' run finished.
+The hook function have one argument: output-directory."
+  :group 'elpa-mirror
+  :type 'hook)
+
+(defcustom elpamr-enable-log nil
+  "Enable log."
+  :type 'boolean
+  :group 'elpa-mirror)
+
+(defvar elpamr--log-buffer "*elpa-mirror log*"
+  "Destination buffer for log messages and command output.")
+
+(defun elpamr--log (format-string &rest args)
+  "Format ARGS with FORMAT-STRING, add the result to the log, and return it.
+The log line will be pre-pended with an asterisk to distinguish it
+from program output."
+  (when elpamr-enable-log
+    (let ((line (apply #'format format-string args)))
+      (with-current-buffer (get-buffer-create elpamr--log-buffer)
+        (insert "* " line "\n"))
+      line)))
+
+(defun elpamr--log-message (format-string &rest args)
+  "Format ARGS with FORMAT-STRING, add the result to the log and display it."
+  (when elpamr-enable-log
+    (apply #'elpamr--log format-string args)
+    (apply #'message format-string args)))
+
+(defun elpamr--log-error (format-string &rest args)
+  "Format ARGS with FORMAT-STRING, add the result to the log and signal an error."
+  (when elpamr-enable-log
+(apply #'elpamr--log format-string args)
+  (apply #'error format-string args)))
+
+(defun elpamr--package-desc (item)
+  "Extract package information from ITEM."
+  (cadr item))
+
+(defun elpamr--is-bsd-tar ()
+  "Are we using BSD tar instead of GNU tar?"
+  (let* ((output (mapconcat #'identity (process-lines elpamr-tar-executable "--version") " "))
+         ;; @see https://github.com/redguardtoo/elpa-mirror/issues/37
+         ;; extra error message insert extra whitespace before "bsdtar"
+         (result (and output (string-match-p "\\(^[ \t]*\\|[ \t]\\)bsdtar" output))))
+    (elpamr--log "Detected tar variant: %s" (if result "BSD" "GNU"))
+    result))
+
+(defun elpamr--create-one-item-for-archive-contents (pkg)
+  "Access PKG extracted from `package-alist' directly."
+  (unless (member (symbol-name (car pkg)) elpamr-exclude-packages)
+    pkg))
+
+(defun elpamr--fullpath (parent file)
+  "Full path of 'PARENT/FILE'."
+  (let* ((result (file-truename (concat (file-name-as-directory parent) file))))
+    (elpamr--log "Converted to full path: %S %S -> %S" parent file result)
+    result))
+
+(defun elpamr--clean-package-description (description)
+  "Clean DESCRIPTION."
+  (replace-regexp-in-string "-\*-.*-\*-" ""
+                            (replace-regexp-in-string "\"" "" description t)
+                            t))
+
+(defun elpamr--get-dependency (item)
+  "Get ITEM dependency."
+  (package-desc-reqs (elpamr--package-desc item)))
+
+(defun elpamr--get-version (item)
+  "Get ITEM version."
+  (package-desc-version (elpamr--package-desc item)))
+
+(defun elpamr--get-summary (item)
+  "Get ITEM description."
+  (package-desc-summary (elpamr--package-desc item)))
+
+(defun elpamr--one-item-for-archive-contents (final-pkg)
+  "Format FINAL-PKG information into a string for archive-contents."
+  (format " (%s . [%S %S \"%s\" tar])\n"
+          (car final-pkg)
+          (elpamr--get-version final-pkg)
+          (elpamr--get-dependency final-pkg)
+          (elpamr--clean-package-description (elpamr--get-summary final-pkg))))
+
+(defun elpamr--call-process-check (arguments)
+  "Call run tar program with the ARGUMENTS.
+Log and signal an error if it exits with a non-zero status."
+  (let ((exit-status (apply #'call-process
+                            elpamr-tar-executable
+                            nil
+                            (and elpamr-enable-log elpamr--log-buffer)
+                            nil
+                            arguments)))
+    (cond
+     ((not (= exit-status 0))
+      (elpamr--log-error
+       "Program %s exited with non-zero status %s, see the %s buffer for details"
+       elpamr-tar-executable exit-status elpamr--log-buffer)
+      )
+     (t
+      exit-status))))
+
+(defun elpamr--run-tar (working-dir out-file dir-to-archive is-bsd-tar)
+  "Run tar in order to archive DIR-TO-ARCHIVE into OUT-FILE.
+Paths are relative to WORKING-DIR.
+IS-BSD-TAR should be non-nil if this function should use a
+command compatible with BSD tar instead of GNU tar."
+  ;; We could detect BSD tar inside this function easily, but detecting it once
+  ;; and then passing it as an argument improves performance.
+  (let* ((exclude-opts (mapcar (lambda (s)
+                                 (concat "--exclude=" (if is-bsd-tar "^" "") s))
+                               (if elpamr-exclude-patterns-filter-function
+                                   (funcall elpamr-exclude-patterns-filter-function
+                                            dir-to-archive)
+                                 elpamr-tar-command-exclude-patterns)))
+         ;; set pwd of process
+         (default-directory working-dir)
+         ;; create tar using GNU tar
+         (tar-args
+          `("cf" ,out-file
+            ,@(unless is-bsd-tar '("--anchored"))
+            ,@exclude-opts
+            ;; tar 1.14 NEWS,
+            ;; @see https://git.savannah.gnu.org/cgit/tar.git/plain/NEWS?id=release_1_14
+            ;; * New option --format allows to select the output archive format
+            ;; * The default output format can be selected at configuration time
+            ;;   by presetting the environment variable DEFAULT_ARCHIVE_FORMAT.
+            ;;   Allowed values are GNU, V7, OLDGNU and POSIX.
+            ,@(unless is-bsd-tar '("--format=gnu"))
+            ;; Improve reproducibility by not storing unnecessary metadata.
+            ;; These options are enough for archives in the GNU format, but if
+            ;; we ever switch to PAX, we'll need to add more (see
+            ;; <http://h2.jaguarpaw.co.uk/posts/reproducible-tar/> and
+            ;; <https://www.gnu.org/software/tar/manual/html_node/PAX-keywords.html>).
+            ,@(unless is-bsd-tar
+                ;; @see https://github.com/redguardtoo/elpa-mirror/issues/41
+                '("--owner=root"
+                  "--group=root"
+                  "--mtime=1970-01-01 00:00:00 UTC"))
+            "--" ,dir-to-archive))
+         ;; Don't archive macOS' file properties (see
+         ;; <https://superuser.com/q/259703>).
+         (process-environment (if (eq system-type 'darwin)
+                                  (cons "COPYFILE_DISABLE=" process-environment)
+                                process-environment)))
+    (elpamr--log "Running tar: %S %S" elpamr-tar-executable tar-args)
+    (elpamr--call-process-check tar-args)))
+
+;;;###autoload
+(defun elpamr-version ()
+  "Current version."
+  (interactive)
+  (message "2.2.2"))
+
+(defun elpamr--win-executable-find (exe)
+  "Find EXE on windows."
+  (let* ((drivers '("c" "d" "e" "f"))
+          (i 0)
+          j
+          (dirs '(":\\\\cygwin64\\\\bin\\\\"
+                 ":\\\\msys64\\\\usr\\\\bin\\\\"))
+          rlt)
+     (while (and (not rlt)
+                 (< i (length dirs)))
+       (setq j 0)
+       (while (and (not rlt)
+                   (< j (length drivers)))
+         (setq rlt (executable-find (concat (nth j drivers) (nth i dirs) exe)))
+         (setq j (1+ j)))
+       (setq i (1+ i)))
+     (unless rlt
+       ;; nothing found, fall back to exe
+       (setq rlt exe))
+     rlt))
+
+(defun elpamr-double-check-executable ()
+  "Make sure `elpamr-tar-executable' is executable."
+  (when (eq system-type 'windows-nt)
+
+    (cond
+     (elpamr-tar-executable
+      (unless (executable-find elpamr-tar-executable)
+        (setq elpamr-tar-executable (elpamr--win-executable-find elpamr-tar-executable))))
+
+     ((executable-find "tar")
+      (setq elpamr-tar-executable "tar")))))
+
+(defun elpamr-delete-directory (directory)
+  "Delete DIRECTORY."
+  (ignore-errors
+    (delete-directory directory t)))
+
+;;;###autoload
+(defun elpamr-create-mirror-for-installed (&optional output-directory recreate-directory)
+  "Export installed packages into a new directory.
+Create the html files for the mirror site.
+
+The first valid directory found from the below list
+will be used as mirror package's output directory:
+1. Argument: OUTPUT-DIRECTORY
+2. Variable: `elpamr-default-output-directory'
+3. Ask user to provide.
+
+When RECREATE-DIRECTORY is non-nil, OUTPUT-DIRECTORY
+will be deleted and recreated."
+  (interactive)
+
+  ;; find tar program on Windows if GNU tar from Cygwin/MYSYS2 is installed
+  ;; and current `elpamr-tar-executable' is NOT executable.
+  (elpamr-double-check-executable)
+
+  (let (final-pkg-list)
+
+    ;; Erase the log (in case of multiple consecutive calls to this function).
+    (when elpamr-enable-log
+      (with-current-buffer (get-buffer-create elpamr--log-buffer)
+        (erase-buffer)))
+
+    ;; Since Emacs 27, `package-initialize' is optional.
+    ;; but we still need it to initialize `package-alist'.
+    (unless package-alist (package-initialize))
+
+    ;; Quote from manual about package-alist:
+    ;;   Alist of all packages available for activation.
+    ;;   Each element has the form (PKG . DESCS), where PKG is a package
+    ;;   name (a symbol) and DESCS is a non-empty list of `package-desc' structure,
+    ;;   sorted by decreasing versions.
+    ;; Sorted for reproducibility.
+    (setq final-pkg-list
+          (let ((sorted-package-alist
+                 (sort (copy-sequence package-alist)
+                       (lambda (a b)
+                         (string< (symbol-name (car a))
+                                  (symbol-name (car b)))))))
+            (delq nil (mapcar #'elpamr--create-one-item-for-archive-contents
+                              sorted-package-alist))))
+
+    ;; set output directory
+    (setq output-directory
+          (cond ((and output-directory
+                      (stringp output-directory))
+                 (file-name-as-directory output-directory))
+                ((and elpamr-default-output-directory
+                      (stringp elpamr-default-output-directory))
+                 (file-name-as-directory elpamr-default-output-directory))
+                (t (read-directory-name "Output directory: "))))
+
+    ;; Delete output directory if we need a clean output directory
+    (when (and recreate-directory
+               (file-directory-p output-directory))
+      (elpamr--log-message "Re-creating %s" output-directory)
+      (elpamr-delete-directory output-directory))
+
+    ;; Create output directory if it does not exist.
+    (unless (file-directory-p output-directory)
+      (make-directory output-directory t))
+
+    (when (and (> (length final-pkg-list) 0)
+               output-directory
+               (file-directory-p output-directory))
+      (let ((tmp-dir (make-temp-file "elpa" t))
+            (is-bsd-tar (elpamr--is-bsd-tar))
+            (cnt 0))
+
+        (dolist (package final-pkg-list)
+          (let* ((pkg-dir (package-desc-dir (car (cdr package))))
+                 (name (package-desc-name (car (cdr package))))
+                 (version-str (package-version-join (package-desc-version (car (cdr package)))))
+                 (name-fixed (format "%s-%s" name version-str))
+                 (package-parent-dir-temp-p (not (string-match (concat "^" (file-truename package-user-dir))
+                                                               pkg-dir)))
+                 (package-parent-dir (cond
+                                      (package-parent-dir-temp-p
+                                       tmp-dir)
+                                      (t
+                                       package-user-dir))))
+
+            (when package-parent-dir-temp-p
+              (copy-directory pkg-dir (elpamr--fullpath tmp-dir name-fixed)))
+
+            (elpamr--run-tar package-parent-dir
+                             (file-relative-name (concat (elpamr--fullpath output-directory name-fixed) ".tar")
+                                                 package-parent-dir)
+                             name-fixed
+                             is-bsd-tar)
+            (message "Creating *.tar... %2d%% (%s)"
+                     (/ (* cnt 100) (length final-pkg-list))
+                     pkg-dir))
+          (setq cnt (1+ cnt)))
+        ;; clean up temp directory
+        (elpamr-delete-directory tmp-dir))
+
+      ;; output archive-contents
+      (elpamr--log-message "Creating archive-contents...")
+      (with-temp-buffer
+        (let* ((print-level nil)
+               (print-length nil))
+          (insert "(1\n")
+          (dolist (final-pkg final-pkg-list)
+            ;; each package occupies one line
+            (insert (elpamr--one-item-for-archive-contents final-pkg)))
+          (insert ")"))
+        (write-file (elpamr--fullpath output-directory "archive-contents")))
+      (run-hook-with-args 'elpamr-finished-hook output-directory)
+      (elpamr--log-message "DONE! Output directory: %s" output-directory))))
+
+(provide 'elpa-mirror)
+;;; elpa-mirror.el ends here