@@ -24,4 +24,10 @@ for lang in ${langs}; do
fi
done
-exec autoreconf -vfi
+autoreconf -vfi
+
+# Replace Automake's build-aux/mdate-sh with build-aux/mdate-from-git, our
+# own, reproducible version.
+chmod +w build-aux/mdate-sh
+rm -f build-aux/mdate-sh
+ln -s mdate-from-git.scm build-aux/mdate-sh
new file mode 100755
@@ -0,0 +1,86 @@
+#! /bin/sh
+# -*-scheme-*-
+export LANG=C LANGUAGE=C LC_TIME=C
+export TZ=UTC0
+exec guile --no-auto-compile -L $srcdir -C $srcdir -e '(mdate-from-git)' -s "$0" "$@"
+!#
+
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2024 Janneke Nieuwenhuizen <janneke@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; This program 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.
+;;;
+;;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+
+;;;; Commentary:
+;;;
+;;; Usage: mdate-from-git.scm FILE
+;;;
+;;; This script is compatible with Automake's `mdate-sh' but uses the timestamp
+;;; from Git instead of from the file system. Also, it can be appended to
+;;; mdate-sh.
+
+;;; As a special exception for Guix, it caters for doc/guix.LANG.texi files that
+;;; are not stored in Git, by using po/doc/guix-manual.LANG.po for the Git
+;;; timestamp. Test doing something like:
+;;;
+;;; build-aux/mdate-from-git.scm doc/guix.de.texi
+;;;
+;;;; Code:
+
+(define-module (mdate-from-git)
+ #:use-module (ice-9 match)
+ #:use-module (ice-9 popen)
+ #:use-module (ice-9 rdelim)
+ #:use-module (ice-9 regex)
+ #:export (main))
+
+(define (pipe-command command)
+ (let* ((port (apply open-pipe* OPEN_READ command))
+ (output (read-string port)))
+ (close-port port)
+ output))
+
+(define (guix.LANG.texi->guix-manual.LANG.po file-name)
+ "Translated manuals doc/guix.LANG.texi are not tracked in Git and are
+generated from po/doc/guix-manual.LANG.po. For such an untraced .TEXI file,
+return its .PO counterpart."
+ (let ((m (string-match "doc/guix.([^.]+).texi" file-name)))
+ (if (not m) file-name
+ (let ((lang (match:substring m 1)))
+ (format #f "po/doc/guix-manual.~a.po" lang)))))
+
+
+;;;
+;;; Entry point.
+;;;
+(define (main args)
+ (match args
+ ((script file-name)
+ (let* ((command `("git" "ls-files" "--error-unmatch" "--" ,file-name))
+ (tracked? (zero? (with-error-to-port (%make-void-port "w")
+ (lambda _ (apply system* command)))))
+ (file-name (if tracked? file-name
+ (guix.LANG.texi->guix-manual.LANG.po file-name)))
+ (command `("git" "log" "--pretty=format:%ct" "-n1" "--" ,file-name))
+ (timestamp (pipe-command command))
+ (source-date-epoch (or (getenv "SOURCE_DATE_EPOCH") "1"))
+ (timestamp (if (string-null? timestamp) source-date-epoch
+ timestamp))
+ (time (gmtime (string->number timestamp)))
+ (d-m-y (strftime "%-d %B %Y" time)))
+ (display d-m-y)))
+ (_
+ (format (current-error-port) "Usage: mdate-from-git.scm FILE\n")
+ (exit 2))))