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;;; el-get-recipes.el --- Manage the external elisp bits and pieces you depend upon
;;
;; Copyright (C) 2010-2011 Dimitri Fontaine
;;
;; Author: Dimitri Fontaine <dim@tapoueh.org>
;; URL: http://www.emacswiki.org/emacs/el-get
;; GIT: https://github.com/dimitri/el-get
;; Licence: WTFPL, grab your copy here: http://sam.zoy.org/wtfpl/
;;
;; This file is NOT part of GNU Emacs.
;;
;; Install
;; Please see the README.asciidoc file from the same distribution

;;; Commentary:
;;
;; el-get-recipes provides the API to manage the el-get recipes.
;;

;; el-get-core provides basic el-get API, intended for developpers of el-get
;; and its methods. See the methods directory for implementation of them.
;;

(require 'el-get-core)
(require 'el-get-byte-compile)

(defcustom el-get-recipe-path-emacswiki
  (concat (file-name-directory el-get-dir) "el-get/recipes/emacswiki/")
  "Define where to keep a local copy of emacswiki recipes"
  :group 'el-get
  :type 'directory)

(defcustom el-get-recipe-path-elpa
  (concat (file-name-directory el-get-dir) "el-get/recipes/elpa/")
  "Define where to keep a local copy of elpa recipes"
  :group 'el-get
  :type 'directory)


(defcustom el-get-recipe-path
  (list (concat (file-name-directory el-get-script) "recipes")
        el-get-recipe-path-elpa
        el-get-recipe-path-emacswiki)
  "List of directories in which to look for el-get recipes.

Directories that contain automatically-generated recipes, such as
`el-get-recipe-path-emacswiki' and `el-get-recipe-path-elpa',
should be placed last in this list."
  :group 'el-get
  :type '(repeat (directory)))

(defcustom el-get-user-package-directory nil
  "Define where to look for init-pkgname.el configurations. Disabled if nil."
  :group 'el-get
  :type '(choice (const :tag "Off" nil) directory))

(defun el-get-load-package-user-init-file (package)
  "Load the user init file for PACKAGE, called init-package.el
and to be found in `el-get-user-package-directory'. Do nothing
when this custom is nil.

Will automatically compile the init file as needed and load the
compiled version."
  (when el-get-user-package-directory
    (let* ((init-file-name (format "init-%s.el" package))
(package-init-file
(expand-file-name init-file-name el-get-user-package-directory))
(file-name-no-extension (file-name-sans-extension package-init-file))
(compiled-init-file (concat file-name-no-extension ".elc")))
      (when (file-exists-p package-init-file)
(when el-get-byte-compile
(el-get-byte-compile-file package-init-file))
(el-get-verbose-message "el-get: load %S" file-name-no-extension)
(load file-name-no-extension 'noerror)))))

(defun el-get-recipe-dirs ()
  "Return the elements of el-get-recipe-path that actually exist.

Used to avoid errors when exploring the path for recipes"
  (reduce (lambda (dir result)
            (if (file-directory-p dir) (cons dir result) result))
          el-get-recipe-path :from-end t :initial-value nil))

;; recipe files are elisp data, you can't byte-compile or eval them on their
;; own, but having elisp indenting and colors make sense
(eval-and-compile
  (add-to-list 'auto-mode-alist '("\\.rcp\\'" . emacs-lisp-mode)))

;;
;; recipes
;;
(defun el-get-read-recipe-file (filename)
  "Read given filename and return its content (a valid form is expected)"
  (condition-case err
      (with-temp-buffer
        (insert-file-contents filename)
        (read (current-buffer)))
    ((debug error)
     (error "Error reading recipe %s: %S" filename err))))

(defun el-get-recipe-filename (package)
  "Return the name of the file that contains the recipe for PACKAGE, if any."
  (let ((package-el (concat (el-get-as-string package) ".el"))
(package-rcp (concat (el-get-as-string package) ".rcp")))
    (loop for dir in el-get-recipe-path
for recipe-el = (expand-file-name package-el dir)
for recipe-rcp = (expand-file-name package-rcp dir)
if (file-exists-p recipe-el) return recipe-el
if (file-exists-p recipe-rcp) return recipe-rcp)))

(defun el-get-read-recipe (package)
  "Return the source definition for PACKAGE, from the recipes."
  (let ((filename (el-get-recipe-filename package)))
    (if filename
(el-get-read-recipe-file filename)
      (error "el-get can not find a recipe for package \"%s\"." package))))

(defun el-get-read-all-recipes ()
  "Return the list of all the recipes, formatted like `el-get-sources'.

Only consider any given recipe only once even if present in
multiple dirs from `el-get-recipe-path'. The first recipe found
is the one considered. We first look in `el-get-sources' then in
each directory listed in `el-get-recipe-path' in order."
  (let ((packages (mapcar 'el-get-source-name el-get-sources)))
    (append
     el-get-sources
     (loop for dir in (el-get-recipe-dirs)
nconc (loop for recipe in (directory-files dir nil "^[^.].*\.\\(rcp\\|el\\)$")
for filename = (concat (file-name-as-directory dir) recipe)
for package = (file-name-sans-extension (file-name-nondirectory recipe))
unless (member package packages)
do (push package packages)
                       and collect (ignore-errors (el-get-read-recipe-file filename)))))))

(defun el-get-package-def (package)
  "Return a single `el-get-sources' entry for PACKAGE."
  (let ((source (loop for src in el-get-sources
when (string= package (el-get-source-name src))
return src)))

    (cond ((or (null source) (symbolp source))
;; not in `el-get-sources', or only mentioned by name
;; (compatibility from pre 3.1 era)
(el-get-read-recipe package))

((null (plist-get source :type))
;; we got a list with no :type, that's an override plist
(loop with def = (el-get-read-recipe package)
for (prop override) on source by 'cddr
do (plist-put def prop override)
finally return def))

;; none of the previous, must be a full definition
(t source))))

(defun el-get-package-method (package-or-source)
  "Return the :type property (called method) of PACKAGE-OR-SOURCE.

If the package is built in to the current major version of Emacs,
return 'builtin."
  (let* ((def (if (or (symbolp package-or-source) (stringp package-or-source))
                  (el-get-package-def package-or-source)
                package-or-source))
         (builtin (plist-get def :builtin)))

    (if (and builtin (>= emacs-major-version builtin))
        'builtin
      (plist-get def :type))))

(defalias 'el-get-package-type #'el-get-package-method)

(defun el-get-package-types-alist (statuses &rest types)
  "Return an alist of package names that are of given types.

Only consider packages whose status is `member' of STATUSES,
which defaults to installed, required and removed. Example:

(el-get-package-types-alist \"installed\" 'http 'cvs)
"
  (loop for src in (apply 'el-get-list-package-names-with-status
(cond ((stringp statuses) (list statuses))
((null statuses) '("installed" "required" "removed"))
(t statuses)))
for name = (el-get-as-symbol src)
for type = (el-get-package-type name)
when (or (null types) (memq 'all types) (memq type types))
collect (cons name type)))

(defun el-get-package-required-emacs-version (package-or-source)
  (let* ((def (if (or (symbolp package-or-source) (stringp package-or-source))
                  (el-get-package-def package-or-source)
                package-or-source)))
    (el-get-plist-get-with-default
        def :minimum-emacs-version
      0)))

(defun el-get-version-to-list (version)
  "Convert VERSION to a standard version list.

Like the builtin `version-to-list', this function accepts a
string. Unlike the builtin, it will also accept a single number,
which will be wrapped into a single-element list, or a or a list
of numbers, which will be returned unmodified."
  (cond
   ;; String
   ((stringp version)
    (version-to-list version))
   ;; Single number
   ((numberp version)
    (list version))
   ;; List of numbers
   ((and (listp version)
         (null (remove-if 'numberp version)))
    version)
   (t (error "Unrecognized version specification: %S" version))))

(defun el-get-error-unless-required-emacs-version (package-or-source)
  "Raise an error if `emacs-major-version' is less than package's requirement.

Second argument PACKAGE is optional and only used to construct the error message."
  (let* ((pname (el-get-source-name package-or-source))
         (required-version (el-get-package-required-emacs-version package-or-source))
         (required-version-list (el-get-version-to-list required-version)))
    (when (version-list-< (version-to-list emacs-version) required-version-list)
      (error "Package %s requires Emacs version %s or higher, but the current emacs is only version %s"
             pname required-version emacs-version))))

(defun el-get-envpath-prepend (envname head)
  "Prepend HEAD in colon-separated environment variable ENVNAME.
This is effectively the same as doing the following in shell:
export ENVNAME=HEAD:$ENVNAME

Use this to modify environment variable such as $PATH or $PYTHONPATH."
  (setenv envname (el-get-envpath-prepend-1 (getenv envname) head)))

(defun el-get-envpath-prepend-1 (paths head)
  "Return \"HEAD:PATHS\" omitting duplicates in it."
  (let ((pplist (split-string (or paths "") ":" 'omit-nulls)))
    (mapconcat 'identity
               (remove-duplicates (cons head pplist)
                                  :test #'string= :from-end t)
               ":")))

(provide 'el-get-recipes)
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