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+;;; pkg-info.el --- Information about packages       -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2013-2015  Sebastian Wiesner <swiesner@lunaryorn.com>
+
+;; Author: Sebastian Wiesner <swiesner@lunaryorn.com>
+;; URL: https://github.com/lunaryorn/pkg-info.el
+;; Package-Version: 20150517.1143
+;; Package-Commit: 76ba7415480687d05a4353b27fea2ae02b8d9d61
+;; Keywords: convenience
+;; Version: 0.7-cvs
+;; Package-Requires: ((epl "0.8"))
+
+;; This file is not part of GNU Emacs.
+
+;; 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 3 of the License, 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This library extracts information from installed packages.
+
+;;;; Functions:
+
+;; `pkg-info-library-version' extracts the version from the header of a library.
+;;
+;; `pkg-info-defining-library-version' extracts the version from the header of a
+;;  library defining a function.
+;;
+;; `pkg-info-package-version' gets the version of an installed package.
+;;
+;; `pkg-info-format-version' formats a version list as human readable string.
+;;
+;; `pkg-info-version-info' returns complete version information for a specific
+;; package.
+;;
+;; `pkg-info-get-melpa-recipe' gets the MELPA recipe for a package.
+;;
+;; `pkg-info-get-melpa-fetcher' gets the fetcher used to build a package on
+;; MELPA.
+;;
+;; `pkg-info-wiki-package-p' determines whether a package was build from
+;; EmacsWiki on MELPA.
+
+;;; Code:
+
+(require 'epl)
+
+(require 'lisp-mnt)
+(require 'find-func)
+(require 'json)                         ; `json-read'
+(require 'url-http)                     ; `url-http-parse-response'
+
+(defvar url-http-end-of-headers)
+
+
+;;; Version information
+(defun pkg-info-format-version (version)
+  "Format VERSION as human-readable string.
+
+Return a human-readable string representing VERSION."
+  ;; XXX: Find a better, more flexible way of formatting?
+  (package-version-join version))
+
+(defsubst pkg-info--show-version-and-return (version show)
+  "Show and return VERSION.
+
+When SHOW is non-nil, show VERSION in minibuffer.
+
+Return VERSION."
+  (when show
+    (message (if (listp version) (pkg-info-format-version version) version)))
+  version)
+
+(defun pkg-info--read-library ()
+  "Read a library from minibuffer."
+  (completing-read "Load library: "
+                   (apply-partially 'locate-file-completion-table
+                                    load-path
+                                    (get-load-suffixes))))
+
+(defun pkg-info--read-function ()
+  "Read a function name from minibuffer."
+  (let ((input (completing-read "Function: " obarray #'boundp :require-match)))
+    (if (string= input "") nil (intern input))))
+
+(defun pkg-info--read-package ()
+  "Read a package name from minibuffer."
+  (let* ((installed (epl-installed-packages))
+         (names (sort (mapcar (lambda (pkg)
+                                (symbol-name (epl-package-name pkg)))
+                              installed)
+                      #'string<))
+         (default (car names)))
+    (completing-read "Installed package: " names nil 'require-match
+                     nil nil default)))
+
+(defun pkg-info-library-source (library)
+  "Get the source file of LIBRARY.
+
+LIBRARY is either a symbol denoting a named feature, or a library
+name as string.
+
+Return the source file of LIBRARY as string."
+  (find-library-name (if (symbolp library) (symbol-name library) library)))
+
+(defun pkg-info-defining-library (function)
+  "Get the source file of the library defining FUNCTION.
+
+FUNCTION is a function symbol.
+
+Return the file name of the library as string.  Signal an error
+if the library does not exist, or if the definition of FUNCTION
+was not found."
+  (unless (functionp function)
+    (signal 'wrong-type-argument (list 'functionp function)))
+  (let ((library (symbol-file function 'defun)))
+    (unless library
+      (error "Can't find definition of %s" function))
+    library))
+
+(defun pkg-info-x-original-version (file)
+  "Read the X-Original-Version header from FILE.
+
+Return the value as version list, or return nil if FILE lacks
+this header.  Signal an error, if the value of the header is not
+a valid version."
+  (let ((version-str (with-temp-buffer
+                       (insert-file-contents file)
+                       (lm-header "X-Original-Version"))))
+    (when version-str
+      (version-to-list version-str))))
+
+;;;###autoload
+(defun pkg-info-library-original-version (library &optional show)
+  "Get the original version in the header of LIBRARY.
+
+The original version is stored in the X-Original-Version header.
+This header is added by the MELPA package archive to preserve
+upstream version numbers.
+
+LIBRARY is either a symbol denoting a named feature, or a library
+name as string.
+
+If SHOW is non-nil, show the version in the minibuffer.
+
+Return the version from the header of LIBRARY as list.  Signal an
+error if the LIBRARY was not found or had no X-Original-Version
+header.
+
+See Info node `(elisp)Library Headers' for more information
+about library headers."
+  (interactive (list (pkg-info--read-library) t))
+  (let ((version (pkg-info-x-original-version
+                  (pkg-info-library-source library))))
+    (if version
+        (pkg-info--show-version-and-return version show)
+      (error "Library %s has no original version" library))))
+
+;;;###autoload
+(defun pkg-info-library-version (library &optional show)
+  "Get the version in the header of LIBRARY.
+
+LIBRARY is either a symbol denoting a named feature, or a library
+name as string.
+
+If SHOW is non-nil, show the version in the minibuffer.
+
+Return the version from the header of LIBRARY as list.  Signal an
+error if the LIBRARY was not found or had no proper header.
+
+See Info node `(elisp)Library Headers' for more information
+about library headers."
+  (interactive (list (pkg-info--read-library) t))
+  (let* ((source (pkg-info-library-source library))
+         (version (epl-package-version (epl-package-from-file source))))
+    (pkg-info--show-version-and-return version show)))
+
+;;;###autoload
+(defun pkg-info-defining-library-original-version (function &optional show)
+  "Get the original version of the library defining FUNCTION.
+
+The original version is stored in the X-Original-Version header.
+This header is added by the MELPA package archive to preserve
+upstream version numbers.
+
+If SHOW is non-nil, show the version in mini-buffer.
+
+This function is mainly intended to find the version of a major
+or minor mode, i.e.
+
+   (pkg-info-defining-library-version 'flycheck-mode)
+
+Return the version of the library defining FUNCTION.  Signal an
+error if FUNCTION is not a valid function, if its defining
+library was not found, or if the library had no proper version
+header."
+  (interactive (list (pkg-info--read-function) t))
+  (pkg-info-library-original-version (pkg-info-defining-library function) show))
+
+;;;###autoload
+(defun pkg-info-defining-library-version (function &optional show)
+  "Get the version of the library defining FUNCTION.
+
+If SHOW is non-nil, show the version in mini-buffer.
+
+This function is mainly intended to find the version of a major
+or minor mode, i.e.
+
+   (pkg-info-defining-library-version 'flycheck-mode)
+
+Return the version of the library defining FUNCTION.  Signal an
+error if FUNCTION is not a valid function, if its defining
+library was not found, or if the library had no proper version
+header."
+  (interactive (list (pkg-info--read-function) t))
+  (pkg-info-library-version (pkg-info-defining-library function) show))
+
+;;;###autoload
+(defun pkg-info-package-version (package &optional show)
+  "Get the version of an installed PACKAGE.
+
+If SHOW is non-nil, show the version in the minibuffer.
+
+Return the version as list, or nil if PACKAGE is not installed."
+  (interactive (list (pkg-info--read-package) t))
+  (let* ((name (if (stringp package) (intern package) package))
+         (package (car (epl-find-installed-packages name))))
+    (unless package
+      (error "Can't find installed package %s" name))
+    (pkg-info--show-version-and-return (epl-package-version package) show)))
+
+;;;###autoload
+(defun pkg-info-version-info (library &optional package show)
+  "Obtain complete version info for LIBRARY and PACKAGE.
+
+LIBRARY is a symbol denoting a named feature, or a library name
+as string.  PACKAGE is a symbol denoting an ELPA package.  If
+omitted or nil, default to LIBRARY.
+
+If SHOW is non-nil, show the version in the minibuffer.
+
+When called interactively, prompt for LIBRARY.  When called
+interactively with prefix argument, prompt for PACKAGE as well.
+
+Return a string with complete version information for LIBRARY.
+This version information contains the version from the headers of
+LIBRARY, and the version of the installed PACKAGE, the LIBRARY is
+part of.  If PACKAGE is not installed, or if the PACKAGE version
+is the same as the LIBRARY version, do not include a package
+version."
+  (interactive (list (pkg-info--read-library)
+                     (when current-prefix-arg
+                       (pkg-info--read-package))
+                     t))
+  (let* ((package (or package (if (stringp library) (intern library) library)))
+         (orig-version (condition-case nil
+                           (pkg-info-library-original-version library)
+                         (error nil)))
+         ;; If we have X-Original-Version, we assume that MELPA replaced the
+         ;; library version with its generated version, so we use the
+         ;; X-Original-Version header instead, and ignore the library version
+         ;; header
+         (lib-version (or orig-version (pkg-info-library-version library)))
+         (pkg-version (condition-case nil
+                          (pkg-info-package-version package)
+                        (error nil)))
+         (version (if (and pkg-version
+                           (not (version-list-= lib-version pkg-version)))
+                      (format "%s (package: %s)"
+                              (pkg-info-format-version lib-version)
+                              (pkg-info-format-version pkg-version))
+                    (pkg-info-format-version lib-version))))
+    (pkg-info--show-version-and-return version show)))
+
+(defconst pkg-info-melpa-recipe-url "http://melpa.org/recipes.json"
+  "The URL from which to fetch MELPA recipes.")
+
+(defvar pkg-info-melpa-recipes nil
+  "An alist of MELPA recipes.")
+
+(defun pkg-info-retrieve-melpa-recipes ()
+  "Retrieve MELPA recipes from MELPA archive."
+  (let ((buffer (url-retrieve-synchronously pkg-info-melpa-recipe-url)))
+    (with-current-buffer buffer
+      (unwind-protect
+          (let ((response-code (url-http-parse-response)))
+            (unless (equal response-code 200)
+              (error "Failed to retrieve MELPA recipes from %s (code %s)"
+                     pkg-info-melpa-recipe-url response-code))
+            (goto-char url-http-end-of-headers)
+            (json-read))
+        (when (and buffer (buffer-live-p buffer))
+          (kill-buffer buffer))))))
+
+(defun pkg-info-get-melpa-recipes ()
+  "Get MELPA recipes."
+  (setq pkg-info-melpa-recipes
+        (or pkg-info-melpa-recipes
+            (pkg-info-retrieve-melpa-recipes))))
+
+(defun pkg-info-get-melpa-recipe (package)
+  "Get the MELPA recipe for PACKAGE.
+
+Return nil if PACKAGE is not on MELPA."
+  (cdr (assq package (pkg-info-get-melpa-recipes))))
+
+(defun pkg-info-get-melpa-fetcher (package)
+  "Get the MELPA fetcher for PACKAGE."
+  (cdr (assq 'fetcher (pkg-info-get-melpa-recipe package))))
+
+(defun pkg-info-wiki-package-p (package)
+  "Determine whether PACKAGE is build from the EmacsWiki."
+  (equal (pkg-info-get-melpa-fetcher package) "wiki"))
+
+(provide 'pkg-info)
+
+;; Local Variables:
+;; indent-tabs-mode: nil
+;; coding: utf-8
+;; End:
+
+;;; pkg-info.el ends here