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;;; guile-email --- Guile email parser
;;; Copyright © 2021 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of guile-email.
;;;
;;; guile-email is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU Affero General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; guile-email 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
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with guile-email. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This script pulls archives of specified GNU mailing lists
;; (currently guix-commits and guix-patches). If a partial archive
;; already exists in the current directory, only the newer messages
;; are downloaded.
;;; Code:
(use-modules (ice-9 format)
(rnrs io ports)
(srfi srfi-1)
(srfi srfi-9 gnu)
(srfi srfi-19)
(srfi srfi-41)
(srfi srfi-71)
(web client)
(web response))
(define-immutable-record-type <archive>
(make-archive mailing-list year month size)
archive?
(mailing-list archive-mailing-list)
(year archive-year set-archive-year)
(month archive-month set-archive-month)
(size archive-size set-archive-size))
(define (archive->uri archive)
(format #f "https://lists.gnu.org/archive/mbox/~a/~a-~2,'0d"
(archive-mailing-list archive)
(archive-year archive)
(archive-month archive)))
(define (initialize-archive-size archive)
(let ((response body (http-head (archive->uri archive))))
(set-archive-size archive (assoc-ref (response-headers response) 'content-length))))
(define (previous-archive archive)
(initialize-archive-size
(case (archive-month archive)
((1) (set-archive-year
(set-archive-month archive 12)
(1- (archive-year archive))))
(else (set-archive-month archive (1- (archive-month archive)))))))
(define (archive->filename archive)
(format #f "~a/~a-~2,'0d.mbox"
(archive-mailing-list archive)
(archive-year archive)
(archive-month archive)))
(define file-size
(compose stat:size stat))
(define (out-of-sync? archive)
(let ((filename (archive->filename archive)))
(if (file-exists? filename)
(< (file-size filename)
(archive-size archive))
#t)))
(define (pull-archive archive)
(let ((file (archive->filename archive)))
(format #t "Pulling archive ~a~%" (archive->filename archive))
(call-with-port (open-file file "a")
(lambda (port)
(let ((response body (http-get (archive->uri archive)
#:decode-body? #f
#:headers `((range . (bytes (,(file-size file) . #f)))))))
(put-bytevector port body))))))
(define (pull-mailing-list mailing-list)
"Pull archives of MAILING-LIST to a directory of the same name."
(define archives
(let ((today (current-date)))
(stream-unfold
identity archive-size previous-archive
(initialize-archive-size
(make-archive mailing-list (date-year today) (date-month today) #f)))))
(stream-for-each pull-archive (stream-take-while out-of-sync? archives)))
(pull-mailing-list "guix-commits")
(pull-mailing-list "guix-patches")
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