;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
;;; Copyright (C) 2012 Nikita Karetnikov <nikita@karetnikov.org>
;;;
;;; This file is part of Guix.
;;;
;;; 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.
;;;
;;; 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 Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (guix gnu-maintenance)
  #:use-module (web uri)
  #:use-module (web client)
  #:use-module (web response)
  #:use-module (srfi srfi-11)
  #:use-module (srfi srfi-26)
  #:use-module (ice-9 regex))

(define (http-fetch str)
  "Fetch a file from STR, which should be a URI."
  (let*-values (((resp data)
                (http-get (string->uri str)))
               ((code)
                (response-code resp)))
    (case code
      ((200)
       data)
      (else
       (error "download failed:" str code
              (string-downcase (response-reason-phrase resp)))))))

(define (rx-filter lst rx)
  "Filter a list using a regexp."
  (map (cut match:substring <>)
       ((cut delete #f <>)
        (map (cut regexp-exec rx <>)
             lst))))

(define %womb
  (string-append "http://cvs.savannah.gnu.org/"
                 "viewvc/*checkout*/gnumaint/"
                 "gnupackages.txt?root=womb"))

(define-public (gnu-packages-womb)
  "Return a list of GNU packages."
  (let ((lst (string-split (http-fetch %womb) #\nl)))
    (map (cut string-drop <> 9)
         (rx-filter lst (make-regexp "^package: (.+)$")))))