90 lines
3.3 KiB
Scheme
90 lines
3.3 KiB
Scheme
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#! /bin/sh
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# -*-scheme-*-
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export LANG=C LANGUAGE=C LC_TIME=C
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export TZ=UTC0
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exec guile --no-auto-compile -L $srcdir -C $srcdir -e '(mdate-from-git)' -s "$0" "$@"
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!#
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2024 Janneke Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; This program is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; This program is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;;;; Commentary:
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;;;
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;;; Usage: mdate-from-git.scm FILE
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;;;
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;;; This script is compatible with Automake's `mdate-sh' but uses the timestamp
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;;; from Git instead of from the file system. Also, it can be appended to
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;;; mdate-sh.
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;;; As a special exception for Guix, it caters for doc/guix.LANG.texi files that
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;;; are not stored in Git, by using po/doc/guix-manual.LANG.po for the Git
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;;; timestamp. Test doing something like:
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;;;
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;;; build-aux/mdate-from-git.scm doc/guix.de.texi
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;;;
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;;;; Code:
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(define-module (mdate-from-git)
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#:use-module (ice-9 match)
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#:use-module (ice-9 popen)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 regex)
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#:export (main))
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(define (pipe-command command)
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(let* ((port (apply open-pipe* OPEN_READ command))
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(output (read-string port)))
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(close-port port)
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output))
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(define (guix.LANG.texi->guix-manual.LANG.po file-name)
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"Translated manuals doc/guix.LANG.texi are not tracked in Git and are
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generated from po/doc/guix-manual.LANG.po. For such an untraced .TEXI file,
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return its .PO counterpart."
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(let ((m (string-match "doc/guix.([^.]+).texi" file-name)))
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(if (not m) file-name
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(let ((lang (match:substring m 1)))
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(format #f "po/doc/guix-manual.~a.po" lang)))))
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;;;
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;;; Entry point.
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;;;
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(define (main args)
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(match args
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((script file-name)
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(let* ((command `("git" "ls-files" "--error-unmatch" "--" ,file-name))
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(tracked? (zero? (with-error-to-port (%make-void-port "w")
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(lambda _
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(with-output-to-port (%make-void-port "w")
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(lambda _ (apply system* command)))))))
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(file-name (if tracked? file-name
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(guix.LANG.texi->guix-manual.LANG.po file-name)))
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(command `("git" "log" "--pretty=format:%ct" "-n1" "--" ,file-name))
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(timestamp (with-error-to-port (%make-void-port "w")
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(lambda _ (pipe-command command))))
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(source-date-epoch (or (getenv "SOURCE_DATE_EPOCH") "1"))
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(timestamp (if (string-null? timestamp) source-date-epoch
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timestamp))
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(time (gmtime (string->number timestamp)))
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(d-m-y (strftime "%-d %B %Y" time)))
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(display d-m-y)))
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(_
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(format (current-error-port) "Usage: mdate-from-git.scm FILE\n")
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(exit 2))))
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