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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;; 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/>.
;;; Commentary:
;;;
;;; This script updates the list of new and updated packages in 'NEWS'.
;;;
;;; Code:
(use-modules (gnu) (guix)
(guix build utils)
((guix ui) #:select (fill-paragraph))
(srfi srfi-1)
(srfi srfi-11)
(ice-9 match)
(ice-9 rdelim)
(ice-9 regex)
(ice-9 pretty-print))
(define %header-rx
(make-regexp "^\\* Changes in (version )?([0-9.]+) \\(since ([0-9.]+)\\)"))
(define (NEWS->versions port)
"Return two values: the previous version and the current version as read
from PORT, which is an input port on the 'NEWS' file."
(let loop ()
(let ((line (read-line port)))
(cond ((eof-object? line)
(error "failed to determine previous and current version"
port))
((regexp-exec %header-rx line)
=>
(lambda (match)
(values (match:substring match 3)
(match:substring match 2))))
(else
(loop))))))
(define (skip-to-org-heading port)
"Read from PORT until an Org heading is found."
(let loop ()
(let ((next (peek-char port)))
(cond ((eqv? next #\*)
#t)
((eof-object? next)
(error "next heading could not be found"))
(else
(read-line port)
(loop))))))
(define (rewrite-org-section input output heading-rx proc)
"Write to OUTPUT the text read from INPUT, but with the first Org section
matching HEADING-RX replaced by NEW-HEADING and CONTENTS."
(let loop ()
(let ((line (read-line input)))
(cond ((eof-object? line)
(error "failed to match heading regexp" heading-rx))
((regexp-exec heading-rx line)
=>
(lambda (match)
(proc match output)
(skip-to-org-heading input)
(dump-port input output)
#t))
(else
(display line output)
(newline output)
(loop))))))
(define (enumeration->paragraph lst)
"Turn LST, a list of strings, into a single string that is a ready-to-print
paragraph."
(fill-paragraph (string-join (sort lst string<?) ", ")
75))
(define (write-packages-added news-file old new)
"Write to NEWS-FILE the list of packages added between OLD and NEW."
(let ((added (lset-difference string=? (map car new) (map car old))))
(with-atomic-file-replacement news-file
(lambda (input output)
(rewrite-org-section input output
(make-regexp "^(\\*+) (.*) new packages")
(lambda (match port)
(let ((stars (match:substring match 1)))
(format port
"~a ~a new packages~%~%~a~%~%"
stars (length added)
(enumeration->paragraph added)))))))))
(define (write-packages-updates news-file old new)
"Write to NEWS-FILE the list of packages upgraded between OLD and NEW."
(let ((upgraded (filter-map (match-lambda
((package . new-version)
(match (assoc package old)
((_ . old-version)
(and (version>? new-version old-version)
(string-append package "@"
new-version)))
(_ #f))))
new)))
(with-atomic-file-replacement news-file
(lambda (input output)
(rewrite-org-section input output
(make-regexp "^(\\*+) (.*) package updates")
(lambda (match port)
(let ((stars (match:substring match 1)))
(format port
"~a ~a package updates~%~%~a~%~%"
stars (length upgraded)
(enumeration->paragraph upgraded)))))))))
(define (main . args)
(match args
((news-file data-directory)
;; Don't browse things listed in the user's $GUIX_PACKAGE_PATH and
;; in external channels.
(parameterize ((%package-module-path
%default-package-module-path))
(define (package-file version)
(string-append data-directory "/packages-"
version ".txt"))
(let-values (((previous-version new-version)
(call-with-input-file news-file NEWS->versions)))
(let* ((old (call-with-input-file (package-file previous-version)
read))
(new (fold-packages (lambda (p r)
(alist-cons (package-name p) (package-version p)
r))
'())))
(call-with-output-file (package-file new-version)
(lambda (port)
(pretty-print new port)))
(write-packages-added news-file old new)
(write-packages-updates news-file old new)))))
(x
(format (current-error-port) "Usage: update-NEWS NEWS-FILE DATA-DIRECTORY
Update the list of new and updated packages in NEWS-FILE using the
previous-version package list from DATA-DIRECTORY.\n")
(exit 1))))
(apply main (cdr (command-line)))
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