import: Add 'elpa' importer.

* guix/import/elpa.scm: New file.
* guix/scripts/import.scm: Add "elpa" to 'importers'.
* guix/scripts/import/elpa.scm: New file.
* Makefile.am (MODULES): Add 'guix/import/elpa.scm' and
  'guix/scripts/import/elpa.scm'.
  (SCM_TESTS): Add 'tests/elpa.scm'.
* doc/guix.texi (Invoking guix import): Document it.
* tests/elpa.scm: New file.
* po/guix/POTFILES.in: Add 'guix/scripts/import/elpa.scm'.

3 files changed, 329 insertions, 1 deletions

diff --git a/guix/import/elpa.scm b/guix/import/elpa.scm
new file mode 100644
index 0000000000..3b3dc1f91a
--- /dev/null
+++ b/guix/import/elpa.scm
@@ -0,0 +1,230 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
+;;;
+;;; 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix import elpa)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 rdelim)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-9 gnu)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-26)
+  #:use-module ((guix download) #:select (download-to-store))
+  #:use-module (guix import utils)
+  #:use-module (guix store)
+  #:use-module (guix ui)
+  #:use-module (guix hash)
+  #:use-module (guix base32)
+  #:use-module ((guix utils) #:select (call-with-temporary-output-file
+                                       memoize))
+  #:export (elpa->guix-package))
+
+(define (elpa-dependencies->names deps)
+  "Convert DEPS, a list of symbol/version pairs à la ELPA, to a list of
+package names as strings"
+  (match deps
+    (((names _ ...) ...)
+     (map symbol->string names))))
+
+(define emacs-standard-library?
+  (let ((libs '("emacs" "cl-lib")))
+    (lambda (lib)
+      "Return true if LIB is part of Emacs itself.  The check is not
+exhaustive and only attempts to recognize a subset of packages which in the
+past were distributed separately from Emacs."
+      (member lib libs))))
+
+(define (filter-dependencies names)
+  "Remove the package names included with Emacs from the list of
+NAMES (strings)."
+  (filter emacs-standard-library? names))
+
+(define (elpa-name->package-name name)
+  "Given the NAME of an Emacs package, return the corresponding Guix name."
+  (let ((package-name-prefix "emacs-"))
+    (if (string-prefix? package-name-prefix name)
+        (string-downcase name)
+        (string-append package-name-prefix (string-downcase name)))))
+
+(define* (elpa-url #:optional (repo 'gnu))
+  "Retrun the URL of REPO."
+  (let ((elpa-archives
+         '((gnu . "http://elpa.gnu.org/packages")
+           (melpa-stable . "http://stable.melpa.org/packages")
+           (melpa . "http://melpa.org/packages"))))
+    (assq-ref elpa-archives repo)))
+
+(define* (elpa-fetch-archive #:optional (repo 'gnu))
+  "Retrive the archive with the list of packages available from REPO."
+  (let ((url (and=> (elpa-url repo)
+                    (cut string-append <> "/archive-contents"))))
+    (if url
+        (call-with-downloaded-file url read)
+        (leave (_ "~A: currently not supported~%") repo))))
+
+(define (call-with-downloaded-file url proc)
+  "Fetch URL, store the content in a temporary file and call PROC with that
+file.  Returns the value returned by PROC."
+  (call-with-temporary-output-file
+   (lambda (temp port)
+     (or (and (url-fetch url temp)
+              (call-with-input-file temp proc))
+         (error "download failed" url)))))
+
+(define (is-elpa-package? name elpa-pkg-spec)
+  "Return true if the string NAME corresponds to the name of the package
+defined by ELPA-PKG-SPEC, a package specification as in an archive
+'archive-contents' file."
+  (eq? (first elpa-pkg-spec) (string->symbol name)))
+
+(define* (elpa-package-info name #:optional (repo 'gnu))
+  "Extract the information about the package NAME from the package archieve of
+REPO."
+  (let* ((archive (elpa-fetch-archive repo))
+         (pkgs (match archive ((version pkg-spec ...) pkg-spec)))
+         (info (filter (cut is-elpa-package? name <>) pkgs)))
+    (if (pair? info) (first info) #f)))
+
+;; Object to store information about an ELPA package.
+(define-record-type <elpa-package>
+  (make-elpa-package name version inputs synopsis kind home-page description
+                     source-url)
+  elpa-package?
+  (name elpa-package-name)
+  (version elpa-package-version)
+  (inputs elpa-package-inputs)
+  (synopsis elpa-package-synopsis)
+  (kind elpa-package-kind)
+  (home-page elpa-package-home-page)
+  (description elpa-package-description)
+  (source-url elpa-package-source-url))
+
+(set-record-type-printer! <elpa-package>
+                          (lambda (package port)
+                            (format port "#<elpa-package ~a-~a>"
+                                      (elpa-package-name package)
+                                      (elpa-package-version package))))
+
+(define (elpa-version->string elpa-version)
+  "Convert the package version as used in Emacs package files into a string."
+  (if (pair? elpa-version)
+      (let-values (((ms rest) (match elpa-version
+                                ((ms . rest)
+                                 (values ms rest)))))
+        (fold (lambda (n s) (string-append s "." (number->string n)))
+              (number->string ms) rest))
+      #f))
+
+(define (package-home-page alist)
+  "Extract the package home-page from ALIST."
+  (or (assq-ref alist ':url) "unspecified"))
+
+(define (ensure-list alist)
+  "If ALIST is the symbol 'nil return the empty list.  Otherwise, return ALIST."
+  (if (eq? alist 'nil)
+      '()
+      alist))
+
+(define (package-source-url kind name version repo)
+  "Return the source URL of the package described the the strings NAME and
+VERSION at REPO.  KIND is either the symbol 'single or 'tar."
+  (case kind
+    ((single) (full-url repo name ".el" version))
+    ((tar) (full-url repo name ".tar" version))
+    (else
+     #f)))
+
+(define* (full-url repo name suffix #:optional (version #f))
+  "Return the full URL of the package NAME at REPO and the SUFFIX.  Maybe
+include VERSION."
+  (if version
+      (string-append (elpa-url repo) "/" name "-" version suffix)
+      (string-append (elpa-url repo) "/" name suffix)))
+
+(define (fetch-package-description kind name repo)
+  "Fetch the description of package NAME of type KIND from REPO."
+  (let ((url (full-url repo name "-readme.txt")))
+    (call-with-downloaded-file url read-string)))
+
+(define* (fetch-elpa-package name #:optional (repo 'gnu))
+  "Fetch package NAME from REPO."
+  (let ((pkg (elpa-package-info name repo)))
+    (match pkg
+      ((name version reqs synopsis kind . rest)
+       (let* ((name (symbol->string name))
+             (ver (elpa-version->string version))
+             (url (package-source-url kind name ver repo)))
+         (make-elpa-package name ver
+                            (ensure-list reqs) synopsis kind
+                            (package-home-page (first rest))
+                            (fetch-package-description kind name repo)
+                            url)))
+      (_ #f))))
+
+(define* (elpa-package->sexp pkg)
+  "Return the `package' S-expression for the Emacs package PKG, a record of
+type '<elpa-package>'."
+
+  (define name (elpa-package-name pkg))
+
+  (define version (elpa-package-version pkg))
+
+  (define source-url (elpa-package-source-url pkg))
+
+  (define dependencies
+    (let* ((deps (elpa-package-inputs pkg))
+           (names (filter-dependencies (elpa-dependencies->names deps))))
+      (map (lambda (n)
+             (let ((new-n (elpa-name->package-name n)))
+               (list new-n (list 'unquote (string->symbol new-n)))))
+           names)))
+
+  (define (maybe-inputs input-type inputs)
+    (match inputs
+      (()
+       '())
+      ((inputs ...)
+       (list (list input-type
+                   (list 'quasiquote inputs))))))
+
+  (let ((tarball (with-store store
+                   (download-to-store store source-url))))
+    `(package
+       (name ,(elpa-name->package-name name))
+       (version ,version)
+       (source (origin
+                 (method url-fetch)
+                 (uri (string-append ,@(factorize-uri source-url version)))
+                 (sha256
+                  (base32
+                   ,(if tarball
+                        (bytevector->nix-base32-string (file-sha256 tarball))
+                        "failed to download package")))))
+       (build-system emacs-build-system)
+       ,@(maybe-inputs 'inputs dependencies)
+       (home-page ,(elpa-package-home-page pkg))
+       (synopsis ,(elpa-package-synopsis pkg))
+       (description ,(elpa-package-description pkg))
+       (license license:gpl3+))))
+
+(define* (elpa->guix-package name #:optional (repo 'gnu))
+  "Fetch the package NAME from REPO and produce a Guix package S-expression."
+  (let ((pkg (fetch-elpa-package name repo)))
+    (and=> pkg elpa-package->sexp)))
+
+;;; elpa.scm ends here
diff --git a/guix/scripts/import.scm b/guix/scripts/import.scm
index 45ce092f13..d0bdec133d 100644
--- a/guix/scripts/import.scm
+++ b/guix/scripts/import.scm
@@ -73,7 +73,7 @@ rather than \\n."
 ;;; Entry point.
 ;;;
 
-(define importers '("gnu" "nix" "pypi" "cpan" "hackage"))
+(define importers '("gnu" "nix" "pypi" "cpan" "hackage" "elpa"))
 
 (define (resolve-importer name)
   (let ((module (resolve-interface
diff --git a/guix/scripts/import/elpa.scm b/guix/scripts/import/elpa.scm
new file mode 100644
index 0000000000..9034eb74e7
--- /dev/null
+++ b/guix/scripts/import/elpa.scm
@@ -0,0 +1,98 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2015 Federico Beffa <beffa@fbengineering.ch>
+;;;
+;;; 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix scripts import elpa)
+  #:use-module (guix ui)
+  #:use-module (guix utils)
+  #:use-module (guix import elpa)
+  #:use-module (guix scripts import)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-11)
+  #:use-module (srfi srfi-37)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 format)
+  #:export (guix-import-elpa))
+
+
+;;;
+;;; Command-line options.
+;;;
+
+(define %default-options
+  '((repo . 'gnu)))
+
+(define (show-help)
+  (display (_ "Usage: guix import elpa PACKAGE-NAME
+Import the latest package named PACKAGE-NAME from an ELPA repository.\n"))
+  (display (_ "
+  -a, --archive=ARCHIVE          specify the archive repository"))
+  (display (_ "
+  -h, --help                     display this help and exit"))
+  (display (_ "
+  -V, --version                  display version information and exit"))
+  (newline)
+  (show-bug-report-information))
+
+(define %options
+  ;; Specification of the command-line options.
+  (cons* (option '(#\h "help") #f #f
+                 (lambda args
+                   (show-help)
+                   (exit 0)))
+         (option '(#\V "version") #f #f
+                 (lambda args
+                   (show-version-and-exit "guix import elpa")))
+         (option '(#\a "archive") #t #f
+                 (lambda (opt name arg result)
+                   (alist-cons 'repo (string->symbol arg)
+                               (alist-delete 'repo result))))
+         %standard-import-options))
+
+
+;;;
+;;; Entry point.
+;;;
+
+(define (guix-import-elpa . args)
+  (define (parse-options)
+    ;; Return the alist of option values.
+    (args-fold* args %options
+                (lambda (opt name arg result)
+                  (leave (_ "~A: unrecognized option~%") name))
+                (lambda (arg result)
+                  (alist-cons 'argument arg result))
+                %default-options))
+
+  (let* ((opts (parse-options))
+         (args (filter-map (match-lambda
+                            (('argument . value)
+                             value)
+                            (_ #f))
+                           (reverse opts))))
+    (match args
+      ((package-name)
+       (let ((sexp (elpa->guix-package package-name (assoc-ref opts 'repo))))
+         (unless sexp
+           (leave (_ "failed to download package '~a'~%") package-name))
+         sexp))
+      (()
+       (leave (_ "too few arguments~%")))
+      ((many ...)
+       (leave (_ "too many arguments~%"))))))
+
+;;; elpa.scm ends here