#!/bin/sh
# Run this after each non-alpha release, to update the web documentation at
# https://www.gnu.org/software/$pkg/manual/

VERSION=2018-03-07.03; # UTC

# Copyright (C) 2009-2020 Free Software Foundation, Inc.

# 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 <https://www.gnu.org/licenses/>.

ME=$(basename "$0")
warn() { printf '%s: %s\n' "$ME" "$*" >&2; }
die() { warn "$*"; exit 1; }

help()
{
  cat <<EOF
Usage: $ME

Run this script from top_srcdir (no arguments) after each non-alpha
release, to update the web documentation at
https://www.gnu.org/software/\$pkg/manual/

This script assumes you're using git for revision control, and
requires a .prev-version file as well as a Makefile, from which it
extracts the version number and package name, respectively.  Also, it
assumes all documentation is in the doc/ sub-directory.

Options:
  -C, --builddir=DIR  location of (configured) Makefile (default: .)
  -n, --dry-run       don't actually commit anything
  -m, --mirror        remove out of date files from document server
  --help              print this help, then exit
  --version           print version number, then exit

Report bugs and patches to <bug-gnulib@gnu.org>.
EOF
  exit
}

version()
{
  year=$(echo "$VERSION" | sed 's/[^0-9].*//')
  cat <<EOF
$ME $VERSION
Copyright (C) $year Free Software Foundation, Inc,
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
EOF
  exit
}

# find_tool ENVVAR NAMES...
# -------------------------
# Search for a required program.  Use the value of ENVVAR, if set,
# otherwise find the first of the NAMES that can be run (i.e.,
# supports --version).  If found, set ENVVAR to the program name,
# die otherwise.
#
# FIXME: code duplication, see also bootstrap.
find_tool ()
{
  find_tool_envvar=$1
  shift
  find_tool_names=$@
  eval "find_tool_res=\$$find_tool_envvar"
  if test x"$find_tool_res" = x; then
    for i
    do
      if ($i --version </dev/null) >/dev/null 2>&1; then
       find_tool_res=$i
       break
      fi
    done
  else
    find_tool_error_prefix="\$$find_tool_envvar: "
  fi
  test x"$find_tool_res" != x \
    || die "one of these is required: $find_tool_names"
  ($find_tool_res --version </dev/null) >/dev/null 2>&1 \
    || die "${find_tool_error_prefix}cannot run $find_tool_res --version"
  eval "$find_tool_envvar=\$find_tool_res"
  eval "export $find_tool_envvar"
}

## ------ ##
## Main.  ##
## ------ ##

# Requirements: everything required to bootstrap your package, plus
# these.
find_tool CVS cvs
find_tool GIT git
find_tool RSYNC rsync
find_tool XARGS gxargs xargs

builddir=.
dryrun=
rm_stale='echo'
while test $# != 0
do
  # Handle --option=value by splitting apart and putting back on argv.
  case $1 in
    --*=*)
      opt=$(echo "$1" | sed -e 's/=.*//')
      val=$(echo "$1" | sed -e 's/[^=]*=//')
      shift
      set dummy "$opt" "$val" "$@"; shift
      ;;
  esac

  case $1 in
    --help|--version) ${1#--};;
    -C|--builddir) shift; builddir=$1; shift ;;
    -n|--dry-run) dryrun=echo; shift;;
    -m|--mirror) rm_stale=''; shift;;
    --*) die "unrecognized option: $1";;
    *) break;;
  esac
done

test $# = 0 \
  || die "too many arguments"

prev=.prev-version
version=$(cat $prev) || die "no $prev file?"
pkg=$(sed -n 's/^PACKAGE = \(.*\)/\1/p' $builddir/Makefile) \
  || die "no Makefile?"
tmp_branch=web-doc-$version-$$
current_branch=$($GIT branch | sed -ne '/^\* /{s///;p;q;}')

cleanup()
{
  __st=$?
  $dryrun rm -rf "$tmp"
  $GIT checkout "$current_branch"
  $GIT submodule update --recursive
  $GIT branch -d $tmp_branch
  exit $__st
}
trap cleanup 0
trap 'exit $?' 1 2 13 15

# We must build using sources for which --version reports the
# just-released version number, not some string like 7.6.18-20761.
# That version string propagates into all documentation.
set -e
$GIT checkout -b $tmp_branch v$version
$GIT submodule update --recursive
./bootstrap
srcdir=$(pwd)
cd "$builddir"
builddir=$(pwd)
  ./config.status --recheck
  ./config.status
  make
  make web-manual
cd "$srcdir"
set +e

tmp=$(mktemp -d web-doc-update.XXXXXX) || exit 1
( cd $tmp \
    && $CVS -d $USER@cvs.sv.gnu.org:/webcvs/$pkg co $pkg )
$RSYNC -avP "$builddir"/doc/manual/ $tmp/$pkg/manual

(
  cd $tmp/$pkg/manual

  # Add all the files.  This is simpler than trying to add only the
  # new ones because of new directories
  # First add non empty dirs individually
  find . -name CVS -prune -o -type d \! -empty -print             \
    | $XARGS -n1 --no-run-if-empty -- $dryrun $CVS add -ko
  # Now add all files
  find . -name CVS -prune -o -type f -print             \
    | $XARGS --no-run-if-empty -- $dryrun $CVS add -ko

  # Report/Remove stale files
  #   excluding doc server specific files like CVS/* and .symlinks
  if test -n "$rm_stale"; then
    echo 'Consider the --mirror option if all of the manual is generated,' >&2
    echo 'which will run `cvs remove` to remove stale files.' >&2
  fi
  { find . \( -name CVS -o -type f -name '.*' \) -prune -o -type f -print
    (cd "$builddir"/doc/manual/ && find . -type f -print | sed p)
  } | sort | uniq -u \
    | $XARGS --no-run-if-empty -- ${rm_stale:-$dryrun} $CVS remove -f

  $dryrun $CVS ci -m $version
)

# Local variables:
# eval: (add-hook 'before-save-hook 'time-stamp)
# time-stamp-start: "VERSION="
# time-stamp-format: "%:y-%02m-%02d.%02H"
# time-stamp-time-zone: "UTC0"
# time-stamp-end: "; # UTC"
# End: