#! /bin/sh

# Bootstrap an Autotooled package from checked-out sources.
# Written by Gary V. Vaughan, 2010
# Inspired by a script written by Paul Eggert.

# This is free software.  There is NO warranty; not even for
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Copyright (C) 2010-2019, 2021, 2023-2025 Bootstrap Authors
#
# This file is dual licensed under the terms of the MIT license
# <https://opensource.org/licenses/MIT>, and GPL version 2 or later
# <https://www.gnu.org/licenses/gpl-2.0.html>.  You must apply one of
# these licenses when using or redistributing this software or any of
# the files within it.  See the URLs above, or the file `LICENSE`
# included in the Bootstrap distribution for the full license texts.

# You should place a copy of this script under version control in the
# top-level directory of your project.  The intent is that all
# customization can be done with a `bootstrap.conf` file also maintained
# in your version control.

# Please report bugs or propose patches to:
# <https://github.com/gnulib-modules/bootstrap/issues>


## ------ ##
## Usage. ##
## ------ ##

# Most GNUish projects do not keep all of the generated Autotool
# files under version control, but running all of the right tools
# with the right arguments, in the correct order to regenerate
# all of those files in readiness for configuration and building
# can be surprisingly involved!  Many projects have a 'bootstrap'
# script under version control to invoke Autotools and perform
# other assorted book-keeping with version numbers and the like.
#
# This bootstrap script aims to probe the configure.ac and top
# Makefile.am of your project to automatically determine what
# the correct ordering and arguments are and then run the tools for
# you.  In order to use it, you can generate an initial standalone
# script with:
#
#   gl/build-aux/inline-source gl/build-aux/bootstrap.in > bootstrap
#
# You should then store than script in version control for other
# developers in your project.  It will give you instructions about
# how to keep it up to date if the sources change.
#
# See gl/doc/bootstrap.texi for documentation on how to write
# a bootstrap.conf to customize it for your project's
# idiosyncrasies.


## ================================================================== ##
##                                                                    ##
##     DO NOT EDIT THIS FILE, CUSTOMIZE IT USING A BOOTSTRAP.CONF     ##
##                                                                    ##
## ================================================================== ##

## ------------------------------- ##
## User overridable command paths. ##
## ------------------------------- ##

# All uppercase denotes values stored in the environment.  These
# variables should generally be overridden by the user - however, we do
# set them to 'true' in some parts of this script to prevent them being
# called at the wrong time by other tools that we call ('autoreconf',
# for example).
#
# We also allow 'LIBTOOLIZE', 'M4', 'SHA1SUM' and some others to be
# overridden, and export the result for child processes, but they are
# handled by the function 'func_find_tool' and not defaulted in this
# section.

: ${ACLOCAL="aclocal"}
: ${AUTOCONF="autoconf"}
: ${AUTOHEADER="autoheader"}
: ${AUTOM4TE="autom4te"}
: ${AUTOHEADER="autoheader"}
: ${AUTOMAKE="automake"}
: ${AUTOPOINT="autopoint"}
: ${AUTORECONF="autoreconf"}
: ${CMP="cmp"}
: ${CONFIG_SHELL="/bin/sh"}
: ${DIFF="diff"}
: ${GIT="git"}
: ${LN_S="ln -s"}
: ${RM="rm"}

export ACLOCAL
export AUTOCONF
export AUTOHEADER
export AUTOM4TE
export AUTOHEADER
export AUTOMAKE
export AUTOPOINT
export AUTORECONF
export CONFIG_SHELL


## -------------- ##
## Configuration. ##
## -------------- ##

# A newline delimited list of triples of programs (that respond to
# --version), the minimum version numbers required (or just '-' in the
# version field if any version will be sufficient) and homepage URLs
# to help locate missing packages.
buildreq=

# Name of a file containing instructions on installing missing packages
# required in 'buildreq'.
buildreq_readme=README-hacking

# These are extracted from AC_INIT in configure.ac, though you can
# override those values in 'bootstrap.conf' if you prefer.
build_aux=
macro_dir=
package=
package_name=
package_version=
package_bugreport=

# These are extracted from 'gnulib-cache.m4', or else fall-back
# automatically on the gnulib defaults; unless you set the values
# manually in 'bootstrap.conf'.
doc_base=
gnulib_mk=
gnulib_name=
local_gl_path=
source_base=
tests_base=

# The list of gnulib modules required at 'gnulib-tool' time.  If you
# check 'gnulib-cache.m4' into your repository, then this list will be
# extracted automatically.
gnulib_modules=

# Extra gnulib files that are not in modules, which override files of
# the same name installed by other bootstrap tools.
gnulib_non_module_files="
        build-aux/compile
        build-aux/install-sh
        build-aux/mdate-sh
        build-aux/texinfo.tex
        build-aux/depcomp
        build-aux/config.guess
        build-aux/config.sub
        doc/INSTALL
"

# Relative path to the local gnulib submodule, and url to the upstream
# git repository. If you have a gnulib entry in your .gitmodules file,
# these values are ignored.
gnulib_path=
gnulib_url=

# Date from which to clone github, to avoid a full clone.
gnulib_clone_since=

# Additional gnulib-tool options to use.
gnulib_tool_options="
        --no-changelog
"

# bootstrap removes any macro-files that are not included by aclocal.m4,
# except for files listed in this variable that are always kept.
gnulib_precious="
        gnulib-tool.m4
"

# When truncating long commands for display, always allow at least this
# many characters before truncating.
min_cmd_len=160

# The command to download all .po files for a specified domain into
# a specified directory.  Fill in the first %s is the domain name, and
# the second with the destination directory.  Use rsync's -L and -r
# options because the latest/%s directory and the .po files within are
# all symlinks.
po_download_command_format=\
"rsync --delete --exclude '*.s1' -Lrtvz \
'translationproject.org::tp/latest/%s/' '%s'"

# Other locale categories that need message catalogs.
extra_locale_categories=

# Additional xgettext options to use.  Gnulib might provide you with an
# extensive list of additional options to append to this, but gettext
# 0.16.1 and newer appends them automatically, so you can safely ignore
# the complaints from 'gnulib-tool' if your $configure_ac states:
#
#    AM_GNU_GETTEXT_VERSION([0.16.1])
xgettext_options="
        --flag=_:1:pass-c-format
        --flag=N_:1:pass-c-format
"

# Package copyright holder for gettext files.  Defaults to FSF if unset.
copyright_holder=

# File that should exist in the top directory of a checked out hierarchy,
# but not in a distribution tarball.
checkout_only_file=

# Whether to use copies instead of symlinks by default (if set to true,
# the --copy option has no effect).
copy=false

# Set this to ".cvsignore .gitignore" in 'bootstrap.conf' if you want
# those files to be generated in directories like 'lib/', 'm4/', and 'po/',
# or set it to "auto" to make this script select what to use based
# on what version control system (if any) is used in the source directory.
# Or set it to "none" to ignore VCS ignore files entirely.  Default is
# "auto".
vc_ignore=


## ------------------- ##
## External Libraries. ##
## ------------------- ##

# Source required external libraries:
. `echo "$0" |${SED-sed} 's|[^/]*$||'`"funclib.sh"
. `echo "$0" |${SED-sed} 's|[^/]*$||'`"options-parser"
. `echo "$0" |${SED-sed} 's|[^/]*$||'`"extract-trace"

# Set a version string for *this* script.
scriptversion=2025-04-22.21; # UTC


## ------------------- ##
## Hookable functions. ##
## ------------------- ##

# After 'bootstrap.conf' has been sourced, execution proceeds by calling
# 'func_bootstrap'.  Wherever a function is decorated with
# 'func_hookable func_name', you will find a matching 'func_run_hooks
# func_name', which executes all functions added with 'func_add_hook
# func_name my_func'.
#
# You might notice that many of these functions begin with a series of
# '$require_foo' lines.  See the docu-comments at the start of the
# 'Resource management' section for a description of what these are.


# func_bootstrap [ARG]...
# -----------------------
# All the functions called inside func_bootstrap are hookable. See the
# the individual implementations for details.
func_bootstrap ()
{
    $debug_cmd

    # Save the current positional parameters to prevent them being
    # corrupted by calls to 'set' in 'func_init'.
    func_quote eval ${1+"$@"}
    _G_saved_positional_parameters=$func_quote_result

    # Initialisation.
    func_init

    # Option processing.
    eval func_options "$_G_saved_positional_parameters"

    # Post-option preparation.
    func_prep

    # Reconfigure the package.
    func_reconfigure

    # Ensure .version is up-to-date.
    func_update_dotversion

    # Finalisation.
    func_fini
}


# func_init
# ---------
# Any early initialisations can be hooked to this function.  Consider
# whether you can hook onto 'func_prep' instead, because if you hook
# any slow to execute code in here, it will also add to the time before
# './bootstrap --version' can respond.
func_hookable func_init
func_init ()
{
    $debug_cmd

    func_run_hooks func_init
}


# func_prep
# ---------
# Function to perform preparation for remaining bootstrap process. If
# your hooked code relies on the outcome of 'func_options' hook it here
# rather than to 'func_init'.
#
# All the functions called inside func_prep are hookable. See the
# individual implementations for details.
func_hookable func_prep
func_prep ()
{
    $debug_cmd

    $require_buildtools_uptodate
    $require_checkout_only_file

    $require_gnulib_merge_changelog

    # Report the results of SED and GREP searches from funclib.sh.
    func_verbose "GREP='$GREP'"
    func_verbose "SED='$SED'"

    # fetch update files from the translation project
    func_update_translations

    func_run_hooks func_prep
}


# func_update_translations
# ------------------------
# Update package po files and translations.
func_hookable func_update_translations
func_update_translations ()
{
    $debug_cmd

    $opt_skip_po || {
      test -d po && {
        $require_package

        func_update_po_files po $package || exit $?
      }

      func_run_hooks func_update_translations
    }
}


# func_reconfigure
# ----------------
# Reconfigure the current package by running the appropriate autotools in a
# suitable order.
func_hookable func_reconfigure
func_reconfigure ()
{
    $debug_cmd

    $require_automake_options

    # Automake (without 'foreign' option) requires that NEWS & README exist.
    case " $automake_options " in
      " foreign ") ;;
      *)
        func_ensure_NEWS
        func_ensure_README
        ;;
    esac

    # Ensure ChangeLog presence.
    if test -n "$gnulib_modules"; then
      func_ifcontains "$gnulib_modules" gitlog-to-changelog \
        func_ensure_changelog
    else
      $require_gnulib_cache
      if $SED -n '/^gl_MODULES(\[/,/^])$/p' $gnulib_cache 2>/dev/null |
         func_grep_q gitlog-to-changelog
      then
        func_ensure_changelog
      fi
    fi

    # Released 'autopoint' has the tendency to install macros that have
    # been obsoleted in current 'gnulib', so run this before 'gnulib-tool'.
    func_autopoint

    # Autoreconf runs 'aclocal' before 'libtoolize', which causes spurious
    # warnings if the initial 'aclocal' is confused by the libtoolized
    # (or worse: out-of-date) macro directory.
    func_libtoolize

    # If you need to do anything after 'gnulib-tool' is done, but before
    # 'autoreconf' runs, you don't need to override this whole function,
    # because 'func_gnulib_tool' is hookable.
    func_gnulib_tool

    func_autoreconf

    func_run_hooks func_reconfigure
}


# func_gnulib_tool
# ----------------
# Run 'gnulib-tool' to fetch gnulib modules into the current package.
#
# It's assumed that since you are using gnulib's 'bootstrap' script,
# you're also using gnulib elsewhere in your package.  If not, then
# you can replace this function in 'bootstrap.conf' with:
#
#   func_gnulib_tool () { :; }
#
# (although the function returns immediately if $gnulib_tool is set to
# true in any case).
func_hookable func_gnulib_tool
func_gnulib_tool ()
{
    $debug_cmd

    $require_gnulib_tool
    $require_libtoolize

    test true = "$gnulib_tool" || {
      $require_gnulib_git_submodules

      # bootstrap.conf written for gnulib bootstrap expects
      # gnulib_tool_option_extras to which --no-changelog is appended,
      # but libtool bootstrap expects you to append to gnulib_tool_options
      # so that you can override the --no-changelog default: make sure we
      # support both styles so users can migrate between them easily.
      gnulib_tool_all_options="$gnulib_tool_options $gnulib_tool_option_extras"

      if test -n "$gnulib_modules"; then
        $require_gnulib_cache
        $require_gnulib_tool_base_options

        gnulib_mode=--import

        # Try not to pick up any stale values from 'gnulib-cache.m4'.
        rm -f "$gnulib_cache"

        test -n "$gnulib_tool_base_options" \
            && func_append_uniq gnulib_tool_all_options " $gnulib_tool_base_options"
        test -n "$gnulib_mk" \
            && func_append_uniq gnulib_tool_all_options " --makefile-name=$gnulib_mk"
        test -n "$tests_base" && {
          func_append_uniq gnulib_tool_all_options " --tests-base=$tests_base"
          func_append_uniq gnulib_tool_all_options " --with-tests"
        }
      else

        # 'gnulib_modules' and others are cached in 'gnulib-cache.m4':
        # Use 'gnulib --update' to fetch gnulib modules.
        gnulib_mode=--update
      fi

      # Add a sensible default libtool option to gnulib_tool_options.
      # The embedded echo is to squash whitespace before globbing.
      case `echo " "$gnulib_tool_all_options" "` in
        *" --no-libtool "*|*" --libtool "*) ;;
        *)  if test true = "$LIBTOOLIZE"; then
              func_append_uniq gnulib_tool_all_options " --no-libtool"
            else
              func_append_uniq gnulib_tool_all_options " --libtool"
            fi
            ;;
      esac

      $opt_copy || func_append_uniq gnulib_tool_all_options " --symlink"

      func_append_uniq gnulib_tool_all_options " $gnulib_mode"
      func_append gnulib_tool_all_options " $gnulib_modules"

      # The embedded echo is to squash whitespace before display.
      gnulib_cmd=`echo $gnulib_tool $gnulib_tool_all_options`

      func_show_eval "$gnulib_cmd" 'exit $?'

      # Use 'gnulib-tool --copy-file' to install non-module files.
      func_install_gnulib_non_module_files
    }

    func_run_hooks func_gnulib_tool
}


# func_fini
# ---------
# Function to perform all finalisation for the bootstrap process.
func_hookable func_fini
func_fini ()
{
    $debug_cmd

    func_gettext_configuration
    func_clean_dangling_symlinks
    func_clean_unused_macros
    func_skip_po_recommendation

    func_run_hooks func_fini

    $require_bootstrap_uptodate

    func_echo "Done.  Now you can run './configure'."
}


# func_gettext_configuration
# --------------------------
# Edit configuration values into po/Makevars.
func_hookable func_gettext_configuration
func_gettext_configuration ()
{
    $debug_cmd

    $require_autopoint

    test true = "$AUTOPOINT" || {
      $require_copyright_holder
      $require_extra_locale_categories
      $require_package_bugreport

      # Escape xgettext options for sed Makevars generation below.
      # We have to delete blank lines in a separate script so that we don't
      # append \\\ to the penultimate line, and then delete the last empty
      # line, which messes up the variable substitution later in this
      # function.  Note that adding a literal \\\ requires double escaping
      # here, once for the execution subshell, and again for the assignment,
      # which is why there are actually 12 (!!) backslashes in the script.
      _G_xgettext_options=`echo "$xgettext_options$nl" |$SED '/^$/d' |$SED '
          $b
          s|$| \\\\\\\\\\\\|'`

      # Create gettext configuration.
      func_echo "Creating po/Makevars from po/Makevars.template ..."
      $RM -f po/Makevars
      $SED '
        /^EXTRA_LOCALE_CATEGORIES *=/s|=.*|= '"$extra_locale_categories"'|
        /^COPYRIGHT_HOLDER *=/s|=.*|= '"$copyright_holder"'|
        /^MSGID_BUGS_ADDRESS *=/s|=.*|= '"$package_bugreport"'|
        /^XGETTEXT_OPTIONS *=/{
          s|$| \\|
          a\
             '"$_G_xgettext_options"' \\\
             $${end_of_xgettext_options+}
        }
        s/ *$//
      ' po/Makevars.template >po/Makevars || exit 1
    }

    func_run_hooks func_gettext_configuration
}



## --------------- ##
## Core functions. ##
## --------------- ##

# This section contains the main functions called from the 'Hookable
# functions' (shown above), and are the ones you're  most likely
# to want to replace with your own implementations in 'bootstrap.conf'.


# func_autopoint
# --------------
# If this package uses gettext, then run 'autopoint'.
func_autopoint ()
{
    $debug_cmd

    $require_autopoint

    test true = "$AUTOPOINT" \
        || func_show_eval "$AUTOPOINT --force" 'exit $?'
}


# func_libtoolize
# ---------------
# If this package uses libtool, then run 'libtoolize'.
func_libtoolize ()
{
    $debug_cmd

    $require_libtoolize

    test true = "$LIBTOOLIZE" || {
      _G_libtoolize_options=
      $opt_copy && func_append _G_libtoolize_options " --copy"
      $opt_force && func_append _G_libtoolize_options " --force"
      $opt_verbose || func_append _G_libtoolize_options " --quiet"
      func_show_eval "$LIBTOOLIZE$_G_libtoolize_options" 'exit $?'
    }
}


# func_gnulib_tool_copy_file SRC DEST
# -----------------------------------
# Copy SRC, a path relative to the gnulib sub-tree, to DEST, a path
# relative to the top-level source directory using gnulib-tool so that
# any patches or replacements in $local_gl_path are applied.
func_gnulib_tool_copy_file ()
{
    $debug_cmd

    $require_gnulib_tool
    $require_patch

    if test true = "$gnulib_tool"; then
      # If gnulib-tool is not available (e.g. bootstrapping in a
      # distribution tarball), make sure that at least we have some
      # version of the required file already in place.
      test -f "$2" || func_fatal_error "\
Can't find, copy or download '$2', a required
gnulib supplied file, please provide the location of a
complete 'gnulib' tree by setting 'gnulib_path' in your
'bootstrap.conf' or with the '--gnulib-srcdir' option -
or else specify the location of your 'git' binary by
setting 'GIT' in the environment so that a fresh
'gnulib' submodule can be cloned."
    else
      $require_gnulib_copy_cmd

      $gnulib_copy_cmd $1 $2 2>/dev/null || {
        $require_gnulib_path

        func_error "'$gnulib_path/$1' does not exist"
        return 1
      }
    fi
}


# func_install_gnulib_non_module_files
# ------------------------------------
# Get additional non-module files from gnulib, overriding existing files.
func_install_gnulib_non_module_files ()
{
    $debug_cmd

    $require_build_aux
    $require_gnulib_tool

    test -n "$gnulib_non_module_files" && {
      maybe_exit_cmd=:

      for file in $gnulib_non_module_files; do
        case $file in
          */COPYING*) dest=COPYING;;
          */INSTALL) dest=INSTALL;;
	  build-aux/missing) dest=
            func_warning settings "\
Please remove build-aux/missing from gnulib_module_files in
'bootstrap.conf', as it may clash with Automake's version."
            ;;
          build-aux/*) dest=$build_aux/`expr "$file" : 'build-aux/\(.*\)'`;;
          *) dest=$file;;
        esac

        # Be sure to show all copying errors before bailing out
	test -z "$dest" \
	    || func_gnulib_tool_copy_file "$file" "$dest" \
	    || maybe_exit_cmd="exit $EXIT_FAILURE"
      done

      $maybe_exit_cmd
    }
}


# func_ensure_changelog
# ---------------------
# Even with 'gitlog-to-changelog' generated ChangeLogs, automake
# will not run to completion with no ChangeLog file.
func_ensure_changelog ()
{
    $debug_cmd

    test -f ChangeLog && mv -f ChangeLog ChangeLog~

    cat >ChangeLog <<'EOT'
## ---------------------- ##
## DO NOT EDIT THIS FILE! ##
## ---------------------- ##

ChangeLog is generated by gitlog-to-changelog.
EOT

    _G_message="creating dummy 'ChangeLog'"
    test -f ChangeLog~ \
      && func_append _G_message ' (backup in ChangeLog~)'
    func_verbose "$_G_message"

    return 0
}


# func_ensure_NEWS
# ----------------
# Without AM_INIT_AUTOMAKE([foreign]), automake will not run to
# completion with no NEWS file, even though NEWS.md or NEWS.txt
# is often preferable.
func_ensure_NEWS ()
{
    $debug_cmd

    test -f NEWS || {
      _G_NEWS=
      for _G_news in NEWS.txt NEWS.md NEWS.rst; do
        test -f "$_G_news" && break
      done

      test -f "$_G_news" && $LN_S $_G_news NEWS
      func_verbose "$LN_S $_G_news NEWS"
    }

    return 0
}


# func_ensure_README
# ------------------
# Without AM_INIT_AUTOMAKE([foreign]), automake will not run to
# completion with no README file, even though README.md or README.txt
# is often preferable.
func_ensure_README ()
{
    $debug_cmd

    test -f README || {
      _G_README=
      for _G_readme in README.txt README.md README.rst; do
        test -f "$_G_readme" && break
      done

      test -f "$_G_readme" && $LN_S $_G_readme README
      func_verbose "$LN_S $_G_readme README"
    }

    return 0
}


# func_autoreconf [SUBDIR]
# ------------------------
# Being careful not to re-run 'autopoint' or 'libtoolize', and not to
# try to run 'autopoint', 'libtoolize' or 'autoheader' on packages that
# don't use them, defer to 'autoreconf' for execution of the remaining
# autotools to bootstrap this package.
#
# Projects with multiple trees to reconfigure can hook another call to
# this function onto func_reconfigure:
#
#    my_autoreconf_foo ()
#    {
#        func_autoreconf foo
#    }
#    func_add_hook func_reconfigure my_autoreconf_foo
func_autoreconf ()
{
    $debug_cmd

    $require_autoheader
    $require_build_aux  # automake and others put files in here
    $require_macro_dir  # aclocal and others put files in here

    # We ran these manually already, and autoreconf won't exec ':'
    save_AUTOPOINT=$AUTOPOINT; AUTOPOINT=true
    save_LIBTOOLIZE=$LIBTOOLIZE; LIBTOOLIZE=true

    _G_autoreconf_options=
    $opt_copy || func_append _G_autoreconf_options " --symlink"
    $opt_force && func_append _G_autoreconf_options " --force"
    $opt_verbose && func_append _G_autoreconf_options " --verbose"
    func_show_eval "$AUTORECONF$_G_autoreconf_options --install${1+ $1}" 'exit $?'

    AUTOPOINT=$save_AUTOPOINT
    LIBTOOLIZE=$save_LIBTOOLIZE
}


# func_check_configuration VARNAME [CONFIGURE_MACRO]
# --------------------------------------------------
# Exit with a suitable diagnostic for an important configuration change
# that needs to be made before bootstrap can run correctly.
func_check_configuration ()
{
    $debug_cmd

    $require_configure_ac

    eval 'test -n "$'$1'"' || {
      _G_error_msg="please set '$1' in 'bootstrap.conf'"
      if test -n "$configure_ac" && test -n "$2"; then
        func_append _G_error_msg "
or add the following (or similar) to your '$configure_ac':
$2"
      fi

      func_fatal_error "$_G_error_msg"
    }
}


# func_clean_dangling_symlinks
# ----------------------------
# Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
# gnulib-populated directories. Such .m4 files would cause aclocal to
# fail.  The following requires GNU find 4.2.3 or newer. Considering
# the usual portability constraints of this script, that may seem a very
# demanding requirement, but it should be ok.  Ignore any failure,
# which is fine, since this is only a convenience to help developers
# avoid the relatively unusual case where a symlinked-to .m4 file is
# git-removed from gnulib between successive runs of this script.
func_clean_dangling_symlinks ()
{
    $debug_cmd

    $require_macro_dir
    $require_source_base

    func_verbose "cleaning dangling symlinks"

    find "$macro_dir" "$source_base" \
        -depth \( -name '*.m4' -o -name '*.[ch]' \) \
        -type l -xtype l -delete > /dev/null 2>&1
}


# func_clean_unused_macros
# ------------------------
# Autopoint can result in over-zealously adding macros into $macro_dir
# even though they are not actually used, for example tests to help
# build the 'intl' directory even though you have specified
# 'AM_GNU_GETTEXT([external])' in your configure.ac.  This function
# looks removes any macro files that can be found in gnulib,  but
# are not 'm4_include'd by 'aclocal.m4'.
func_clean_unused_macros ()
{
    $debug_cmd

    $require_gnulib_path
    $require_macro_dir

    test -n "$gnulib_path" && test -f aclocal.m4 && {
      aclocal_m4s=`find . -name aclocal.m4 -print`

      # We use 'ls|grep' instead of 'ls *.m4' to avoid exceeding
      # command line length limits in some shells.
      for file in `cd "$macro_dir" && ls -1 |$GREP '\.m4$'`; do

	# Remove a macro file when aclocal.m4 does not m4_include it...
        func_grep_q 'm4_include([[]'$macro_dir/$file'])' $aclocal_m4s \
            || test ! -f "$gnulib_path/m4/$file" || {

              # ...and there is an identical file in gnulib...
              if func_cmp_s "$gnulib_path/m4/$file" "$macro_dir/$file"; then

                # ...and it's not in the precious list ('echo' is needed
                # here to squash whitespace for the match expression).
                case " "`echo $gnulib_precious`" " in
                  *" $file "*) ;;
                  *) rm -f "$macro_dir/$file"
                     func_verbose \
                       "removing unused gnulib file '$macro_dir/$file'"
                esac
              fi
        }
      done
    }
}


# func_skip_po_recommendation
# ---------------------------
# If there is a po directory, and '--skip-po' wasn't passed, let the
# user know that they can use '--skip-po' on subsequent invocations.
func_skip_po_recommendation ()
{
    $debug_cmd

    test ! -d po \
        || $opt_skip_po \
        || func_warning recommend "\
If your pofiles are up-to-date, you can rerun bootstrap
as '$progname --skip-po' to avoid redownloading."
}


# func_update_dotversion
# ----------------------
# Even with 'gitlog-to-changelog' generated ChangeLogs, automake
# will not run to completion with no ChangeLog file.
func_update_dotversion ()
{
    $debug_cmd

    test -f "$build_aux/git-version-gen" && {
      _G_message="updating .version"
      test -f .version && {
        mv .version .version~
	func_append _G_message " (backup in .version~)"
      }
      func_verbose "updating .version"

      $build_aux/git-version-gen dummy-arg > .version
    }
}



## -------------------- ##
## Resource management. ##
## -------------------- ##

# This section contains definitions for functions that each ensure a
# particular resource (a file, or a non-empty configuration variable for
# example) is available, and if appropriate to extract default values
# from pertinent package files.  Where a variable already has a non-
# empty value (as set by the package's 'bootstrap.conf'), that value is
# used in preference to deriving the default. Call them using their
# associated 'require_*' variable to ensure that they are executed, at
# most, once.


# require_gnulib_git_submodules
# -----------------------------
# Initialize all git modules from $gnulib_git_submodules before we
# run 'gnulib-tool'.
require_gnulib_git_submodules=func_require_gnulib_git_submodules
func_require_gnulib_git_submodules ()
{
    test -n "$gnulib_git_submodules" && {
      for _G_submodule in $gnulib_git_submodules
      do
        func_show_eval "git submodule init -- $_G_submodule" \
            && func_show_eval "git submodule update -- $_G_submodule" \
            || func_fatal_error "Unable to init git module '$_G_submodule'."
      done
    }

    require_gnulib_git_submodules=:
}


# require_checkout_only_file
# --------------------------
# Bail out  if this package only bootstraps properly from a repository
# checkout.
require_checkout_only_file=func_require_checkout_only_file
func_require_checkout_only_file ()
{
    $debug_cmd

    $opt_force || {
      test -n "$checkout_only_file" && test ! -f "$checkout_only_file" \
          && func_fatal_error "\
Bootstrapping from a non-checked-out distribution is risky.
If you wish to bootstrap anyway, use the '--force' option."
    }

    require_checkout_only_file=:
}


# require_aclocal_amflags
# -----------------------
# Ensure '$aclocal_amflags' has a sensible default, extracted from
# 'Makefile.am' if necessary.
require_aclocal_amflags=func_require_aclocal_amflags
func_require_aclocal_amflags ()
{
    $debug_cmd

    $require_makefile_am

    _G_sed_extract_aclocal_amflags='s|#.*$||
        /^[	 ]*ACLOCAL_AMFLAGS[	 ]*=/ {
            s|^.*=[	 ]*\(.*\)|aclocal_amflags="\1"|
            p
        }'

    _G_aclocal_flags_cmd=`$SED -n "$_G_sed_extract_aclocal_amflags" \
        "$makefile_am"`
    eval "$_G_aclocal_flags_cmd"

    func_verbose "ACLOCAL_AMFLAGS='$aclocal_amflags'"

    require_aclocal_amflags=:
}


# require_autoheader
# ------------------
# Skip autoheader if it's not needed.
require_autoheader=func_require_autoheader
func_require_autoheader ()
{
    $debug_cmd

    test true = "$AUTOHEADER" || {
      func_extract_trace AC_CONFIG_HEADERS
      test -n "$func_extract_trace_result" \
	  || func_extract_trace AC_CONFIG_HEADER

      test -n "$func_extract_trace_result" || {
        AUTOHEADER=true

        func_verbose "export AUTOHEADER='$AUTOHEADER'"

        # Make sure the search result is visible to subshells
        export AUTOHEADER
      }
    }

    require_autoheader=:
}


# require_automake_options
# ------------------------
# Extract options from AM_AUTOMAKE_INIT.
require_automake_options=func_require_automake_options
func_require_automake_options ()
{
    $debug_cmd

    func_extract_trace AM_INIT_AUTOMAKE
    automake_options=$func_extract_trace_result

    require_automake_options=:
}


# require_autopoint
# -----------------
# Skip autopoint if it's not needed.
require_autopoint=func_require_autopoint
func_require_autopoint ()
{
    $debug_cmd

    test true = "$AUTOPOINT" || {
      func_extract_trace AM_GNU_GETTEXT_VERSION

      test -n "$func_extract_trace_result" || {
        AUTOPOINT=true

        func_verbose "export AUTOPOINT='$AUTOPOINT'"

        # Make sure the search result is visible to subshells
        export AUTOPOINT
      }
    }

    require_autopoint=:
}


# require_bootstrap_uptodate
# --------------------------
# Complain if the version of bootstrap in the gnulib directory differs
# from the one we are running.
require_bootstrap_uptodate=func_require_bootstrap_uptodate
func_require_bootstrap_uptodate ()
{
    $debug_cmd

    $require_build_aux

    _G_bootstrap_sources="
      $build_aux/bootstrap.in
      $build_aux/extract-trace
      $build_aux/funclib.sh
      $build_aux/options-parser
    "

    _G_missing_bootstrap_sources=false
    for _G_src in $_G_bootstrap_sources; do
      test -f "$_G_src" || _G_missing_bootstrap_sources=:
    done

    if $_G_missing_bootstrap_sources; then
      func_warning upgrade "\
Please add bootstrap to your gnulib_modules list in
'bootstrap.conf', so that I can tell you when there are
updates available."
    else
      rm -f bootstrap.new
      $build_aux/inline-source $build_aux/bootstrap.in > bootstrap.new

      if func_cmp_s "$progpath" bootstrap.new; then
        rm -f bootstrap.new
	func_verbose "bootstrap script up to date"
      else
        chmod 555 bootstrap.new
        func_warning upgrade "\
An updated bootstrap script has been generated for you in
'bootstrap.new'.  After you've verified that you want
the changes, you can update with:
    mv -f bootstrap.new $progname
    ./$progname

Or you can disable this check permanently by adding the
following to 'bootstrap.conf':
    require_bootstrap_uptodate=:"
      fi
    fi

    require_bootstrap_uptodate=:
}


# require_build_aux
# -----------------
# Ensure that '$build_aux' is set, and if it doesn't already point to an
# existing directory, create one.
require_build_aux=func_require_build_aux
func_require_build_aux ()
{
    $debug_cmd

    test -n "$build_aux" || {
      func_extract_trace_first AC_CONFIG_AUX_DIR
      build_aux=$func_extract_trace_first_result
      func_check_configuration build_aux \
          "AC_CONFIG_AUX_DIR([name of a directory for build scripts])"

      func_verbose "build_aux='$build_aux'"
    }

    $require_vc_ignore_files

    # If the build_aux directory doesn't exist, create it now, and mark it
    # as ignored for the VCS.
    if test ! -d "$build_aux"; then
      func_show_eval "mkdir '$build_aux'"

      test -n "$vc_ignore_files" \
          || func_insert_if_absent "$build_aux" $vc_ignore_files
    fi

    require_build_aux=:
}


# require_buildreq_autobuild
# --------------------------
# Try to find whether the bootstrap requires autobuild.
require_buildreq_autobuild=func_require_buildreq_autobuild
func_require_buildreq_autobuild ()
{
    $debug_cmd

    $require_macro_dir

    test -f "$macro_dir/autobuild.m4" \
        || printf '%s\n' "$buildreq" |func_grep_q '^[	 ]*autobuild' \
        || {
      func_extract_trace AB_INIT
      test -n "$func_extract_trace_result" && {
        func_append buildreq 'autobuild - http://josefsson.org/autobuild/
'
        func_verbose "auto-adding 'autobuild' to build requirements"
      }
    }

    require_buildreq_autobuild=:
}


# require_buildreq_autoconf
# require_buildreq_autopoint
# require_buildreq_libtoolize
# ---------------------------
# Try to find the minimum compatible version of autoconf/libtool
# required to bootstrap successfully, and add it to '$buildreq'.
for tool in autoconf libtoolize autopoint; do
  b=$tool
  v=require_buildreq_${tool}
  f=func_$v
  case $tool in
    autoconf) m=AC_PREREQ ;;
    libtoolize) m=LT_PREREQ; b=libtool ;;
    autopoint) m=AM_GNU_GETTEXT_VERSION b=gettext ;;
  esac

  eval $v'='$f'
  '$f' ()
  {
    $debug_cmd

    # The following is ignored if undefined, but might be necessary
    # in order for `func_find_tool` to run.
    ${require_'$tool'-:}

    printf '\''%s\n'\'' "$buildreq" |func_grep_q '\''^[	 ]*'$tool\'' || {
      func_extract_trace '$m'
      _G_version=$func_extract_trace_result
      test -n "$_G_version" && {
        func_append buildreq "\
            '$tool' $_G_version https://www.gnu.org/s/'$b'
"
        func_verbose \
            "auto-adding '\'$tool'-$_G_version'\'' to build requirements"
      }
    }

    '$v'=:
  }
'
done


# require_buildreq_automake
# -------------------------
# Try to find the minimum compatible version of automake required to
# bootstrap successfully, and add it to '$buildreq'.
require_buildreq_automake=func_require_buildreq_automake
func_require_buildreq_automake ()
{
    $debug_cmd

    # if automake is not already listed in $buildreq...
    printf '%s\n' "$buildreq" |func_grep_q automake || {
      func_extract_trace AM_INIT_AUTOMAKE

      # ...and AM_INIT_AUTOMAKE is declared...
      test -n "$func_extract_trace_result" && {
        automake_version=`$ECHO "$func_extract_trace_result" \
           |$SED -e 's|[^0-9]*||' -e 's| .*$||'`
        test -n "$automake_version" || automake_version=-

        func_append buildreq "\
            automake $automake_version https://www.gnu.org/s/automake
"
        func_verbose \
            "auto-adding 'automake-$automake_version' to build requirements"
      }
    }

    require_buildreq_automake=:
}


# require_buildreq_patch
# ----------------------
# Automatically add a patch build-requirement if there are diff files
# in $local_gl_path.
require_buildreq_patch=func_require_buildreq_patch
func_require_buildreq_patch ()
{
    $debug_cmd

    $require_local_gl_path

    # This ensures PATCH is set appropriately by the time
    # func_check_versions enforces $buildreq.
    $require_patch

    # If patch is not already listed in $buildreq...
    printf '%s\n' "$buildreq" |func_grep_q '^[	 ]*patch' || {
      eval "set dummy $local_gl_path_quoted" ; shift

      for _G_dir
      do
        # The ugly find invocation is necessary to exit with non-zero
        # status for old find binaries that don't support -exec fully.
        if test ! -d "$_G_dir" \
            || find "$_G_dir" -name "*.diff" -exec false {} \; ; then :
        else
          func_append buildreq "patch - https://www.gnu.org/s/patch$nl"
          break
        fi
      done
    }

    require_buildreq_patch=:
}


# require_buildtools_uptodate
# ---------------------------
# Ensure all the packages listed in BUILDREQS are available on the build
# machine at the minimum versions or better.
require_buildtools_uptodate=func_require_buildtools_uptodate
func_require_buildtools_uptodate ()
{
    $debug_cmd

    $require_buildreq_autobuild
    $require_buildreq_autoconf
    $require_buildreq_automake
    $require_buildreq_libtoolize
    $require_buildreq_autopoint
    $require_buildreq_patch

    test -n "$buildreq" && {
      _G_error_hdr=

      func_check_versions $buildreq
      $func_check_versions_result || {
        test -n "$buildreq_readme" \
            && test -f "$buildreq_readme" \
            && _G_error_hdr="\
$buildreq_readme explains how to obtain these prerequisite programs:
"
        func_strtable 0 11 12 36 \
            "Program" "Min_version" "Homepage" $buildreq
        func_fatal_error "$_G_error_hdr$func_strtable_result"
      }
    }

    require_buildtools_uptodate=:
}


# require_copyright_holder
# ------------------------
# Ensure there is a sensible non-empty default value in '$copyright_holder'.
require_copyright_holder=func_require_copyright_holder
func_require_copyright_holder ()
{
    $debug_cmd

    test -n "$copyright_holder" || {
      copyright_holder='Free Software Foundation, Inc.'
      func_warning settings "\
Please set copyright_holder explicitly in 'bootstrap.conf';
defaulting to '$copyright_holder'."
    }

    require_copyright_holder=:
}


# require_doc_base
# ----------------
# Ensure doc_base has a sensible value, extracted from 'gnulib-cache.m4'
# if possible, otherwise letting 'gnulib-tool' pick a default.
require_doc_base=func_require_doc_base
func_require_doc_base ()
{
    $debug_cmd

    $require_gnulib_cache

    test -f "$gnulib_cache" && test -z "$doc_base" && {
      func_extract_trace_first "gl_DOC_BASE" "$gnulib_cache"
      doc_base=$func_extract_trace_first_result

      test -n "$doc_base" && func_verbose "doc_base='$doc_base'"
    }

    require_doc_base=:
}


# require_dotgitmodules
# ---------------------
# Ensure we have a '.gitmodules' file, with appropriate 'gnulib' settings.
require_dotgitmodules=func_require_dotgitmodules
func_require_dotgitmodules ()
{
    $debug_cmd

    $require_git

    test true = "$GIT" || {
      # A gnulib entry in .gitmodules always takes precedence.
      _G_path=`$GIT config --file .gitmodules submodule.gnulib.path 2>/dev/null`

      test -n "$_G_path" || {
        $require_vc_ignore_files

        func_verbose "creating '.gitmodules'"

        # If the .gitmodules file doesn't exist, create it now, and mark
        # it as ignored for the VCS.
        test -n "$gnulib_path" || gnulib_path=gnulib
        test -n "$gnulib_url"  || gnulib_url=git://git.sv.gnu.org/gnulib

        {
          echo '[submodule "gnulib"]'
          echo "	path = $gnulib_path"
          echo "	url = $gnulib_url"
        } >> .gitmodules

        test -n "$vc_ignore_files" \
          || func_insert_if_absent ".gitmodules" $vc_ignore_files
      }
    }

    require_dotgitmodules=:
}


# require_extra_locale_categories
# -------------------------------
# Ensure there is a default value in '$extra_locale_categories'
require_extra_locale_categories=func_require_extra_locale_categories
func_require_extra_locale_categories ()
{
    $debug_cmd

    # Defaults to empty, so run with whatever value may have been set in
    # 'bootstrap.conf'.
    require_extra_locale_categories=:
}


# require_git
# -----------
# Ignore git if it's not available, or we're not in a git checkout tree.
require_git=func_require_git
func_require_git ()
{
    $debug_cmd

    $opt_skip_git && GIT=true

    test true = "$GIT" || {
      if test -d .git/.; then
        ($GIT --version) >/dev/null 2>&1 || GIT=true
      fi
    }

    func_verbose "GIT='$GIT'"

    require_git=:
}


# require_gnulib_cache
# --------------------
# Ensure there is a non-empty default for '$gnulib_cache', and that it
# names an existing file.
require_gnulib_cache=func_require_gnulib_cache
func_require_gnulib_cache ()
{
    $debug_cmd

    $require_macro_dir

    test -n "$gnulib_cache" \
      || gnulib_cache=$macro_dir/gnulib-cache.m4

    func_verbose "found '$gnulib_cache'"

    require_gnulib_cache=:
}


# require_gnulib_copy_cmd
# -----------------------
# Only calculate the options for copying files with gnulib once.
require_gnulib_copy_cmd=func_require_gnulib_copy_cmd
func_require_gnulib_copy_cmd ()
{
    $debug_cmd

    $require_gnulib_tool
    $require_gnulib_tool_base_options

    gnulib_copy_cmd="$gnulib_tool $gnulib_tool_base_options --copy-file"
    $opt_copy || func_append gnulib_copy_cmd " --symlink"
    $opt_quiet || func_append gnulib_copy_cmd " --verbose"

    require_gnulib_copy_cmd=:
}


# require_gnulib_merge_changelog
# ------------------------------
# See if we can use gnulib's git-merge-changelog merge driver.
require_gnulib_merge_changelog=func_require_gnulib_merge_changelog
func_require_gnulib_merge_changelog ()
{
    $debug_cmd

    test -f ChangeLog && {
      $require_git

      func_grep_q '^\(/\|\)ChangeLog$' .gitignore || test true = "$GIT" || {
        if $GIT config merge.merge-changelog.driver >/dev/null; then
          :
        elif (git-merge-changelog --version) >/dev/null 2>&1; then
          func_echo "initializing git-merge-changelog driver"
          $GIT config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
          $GIT config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
        else
          func_warning recommend \
              "Consider installing git-merge-changelog from gnulib."
        fi
      }
    }

    require_gnulib_merge_changelog=:
}


# require_gnulib_mk
# -----------------
# Ensure gnulib_mk has a sensible value, extracted from 'gnulib-cache.m4'
# if possible, otherwise letting 'gnulib-tool' pick a default.
require_gnulib_mk=func_require_gnulib_mk
func_require_gnulib_mk ()
{
    $debug_cmd

    $require_gnulib_cache

    test -f "$gnulib_cache" && test -z "$gnulib_mk" && {
      func_extract_trace_first "gl_MAKEFILE_NAME" "$gnulib_cache"
      gnulib_mk=$func_extract_trace_first_result

      test -n "$gnulib_mk" && func_verbose "gnulib_mk='$gnulib_mk'"
    }

    require_gnulib_mk=:
}


# require_gnulib_name
# -------------------
# Ensure gnulib_name has a sensible value, extracted from 'gnulib-cache.m4'
# if possible, otherwise letting 'gnulib-tool' pick a default.
require_gnulib_name=func_require_gnulib_name
func_require_gnulib_name ()
{
    $debug_cmd

    $require_gnulib_cache

    test -f "$gnulib_cache" && test -z "$gnulib_name" && {
      func_extract_trace_first "gl_LIB" "$gnulib_cache"
      gnulib_name=$func_extract_trace_first_result

      test -n "$gnulib_name" && func_verbose "gnulib_name='$gnulib_name'"
    }

    require_gnulib_name=:
}


# require_gnulib_path
# require_gnulib_url
# -------------------
# Ensure 'gnulib_path' and 'gnulib_url' are set.
require_gnulib_path=func_require_dotgitmodules_parameters
require_gnulib_url=func_require_dotgitmodules_parameters
func_require_dotgitmodules_parameters ()
{
    $debug_cmd

    $require_git

    test true = "$GIT" && {
      # If we can't find git (or if the user specified '--skip-git'),
      # then use an existing gnulib directory specified with
      # '--gnulib-srcdir' if possible.
      test -n "$gnulib_path" \
          || test ! -x "$opt_gnulib_srcdir/gnulib-tool" \
          || gnulib_path=$opt_gnulib_srcdir
    }


    $require_dotgitmodules

    test -f .gitmodules && {
      # Extract the parameters with sed, since git may be missing
      test -n "$gnulib_path" \
        || gnulib_path=`$SED -e '/^.submodule "gnulib".$/,${
                                   /[	 ]*path *= */{
			             s|[   ]*||g;s|^[^=]*=||;p
			           }
		                 }
				 d' .gitmodules |$SED 1q`
      test -n "$gnulib_url" \
        || gnulib_url=`$SED -e '/^.submodule "gnulib".$/,${
                                  /[	 ]*url *= */{
			            s|[   ]*||g;s|^[^=]*=||;p
			          }
		                }
				d' .gitmodules |$SED 1q`

      func_verbose "gnulib_path='$gnulib_path'"
      func_verbose "gnulib_url='$gnulib_url'"
    }

    require_gnulib_path=:
    require_gnulib_url=:
}


# require_gnulib_submodule
# ------------------------
# Ensure that there is a current gnulib submodule at '$gnulib_path'.
require_gnulib_submodule=func_require_gnulib_submodule
func_require_gnulib_submodule ()
{
    $debug_cmd

    $require_git

    if test true = "$GIT"; then
      func_warning recommend \
          "No 'git' found; imported gnulib modules may be outdated."
    else
      $require_gnulib_path
      $require_gnulib_url

      if test -f .gitmodules && test -f "$gnulib_path/gnulib-tool"; then
        : All present and correct.

      elif test -n "$opt_gnulib_srcdir"; then
        # Older git can't clone into an empty directory.
        rmdir "$gnulib_path" 2>/dev/null
        func_show_eval "$GIT clone --reference '$opt_gnulib_srcdir' \
                '$gnulib_url' '$gnulib_path'" \
            || func_fatal_error "Unable to fetch gnulib submodule."

      # Without --gnulib-srcdir, and no existing checked out submodule, we
      # create a new shallow clone of the remote gnulib repository.
      else
        trap func_cleanup_gnulib 1 2 13 15

        shallow=
        test -n "$gnulib_clone_since" && \
            $GIT clone -h 2>&1 |func_grep_q shallow-since \
            && shallow="--shallow-since=$gnulib_clone_since"

        func_show_eval "$GIT clone $shallow '$gnulib_url' '$gnulib_path'" \
          func_cleanup_gnulib

	# FIXME: Solaris /bin/sh will try to execute '-' if any of
	#        these signals are caught after this.
        trap - 1 2 13 15
      fi

      # Make sure we've checked out the correct revision of gnulib.
      func_show_eval "$GIT submodule init -- $gnulib_path" \
          && func_show_eval "$GIT submodule update -- $gnulib_path" \
          ||  func_fatal_error "Unable to update gnulib submodule."
    fi

    require_gnulib_submodule=:
}


# require_gnulib_tool
# -------------------
# Ensure that '$gnulib_tool' is set, and points to an executable file,
# or else fall back to using the binary 'true' if the main gnulib
# files appear to have been imported already.
require_gnulib_tool=func_require_gnulib_tool
func_require_gnulib_tool ()
{
    $debug_cmd

    test true = "$gnulib_tool" || {
      $require_gnulib_submodule
      $require_gnulib_path

      test -n "$gnulib_tool" \
        || gnulib_tool=$gnulib_path/gnulib-tool

      test -x "$gnulib_tool" || {
        gnulib_tool=true
        func_warning recommend \
            "No 'gnulib-tool' found; gnulib modules may be missing."
      }

      test true = "$gnulib_tool" \
          || func_verbose "found '$gnulib_tool'"
    }

    require_gnulib_tool=:
}


# require_gnulib_tool_base_options
# --------------------------------
# Ensure that '$gnulib_tool_base_options' contains all the base options
# required according to user configuration from bootstrap.conf.
require_gnulib_tool_base_options=func_require_gnulib_tool_base_options
func_require_gnulib_tool_base_options ()
{
    $debug_cmd

    $require_gnulib_tool

    gnulib_tool_base_options=

    test true = "$gnulib_tool" || {
      # 'gnulib_modules' and others are maintained in 'bootstrap.conf':
      # Use 'gnulib --import' to fetch gnulib modules.
      $require_build_aux
      test -n "$build_aux" \
          && func_append_uniq gnulib_tool_base_options " --aux-dir=$build_aux"
      $require_macro_dir
      test -n "$macro_dir" \
          && func_append_uniq gnulib_tool_base_options " --m4-base=$macro_dir"
      $require_doc_base
      test -n "$doc_base" \
          && func_append_uniq gnulib_tool_base_options " --doc-base=$doc_base"
      $require_gnulib_name
      test -n "$gnulib_name" \
          && func_append_uniq gnulib_tool_base_options " --lib=$gnulib_name"
      $require_local_gl_path
      test -n "$local_gl_path" && {
        eval "set dummy $local_gl_path_quoted" ; shift
        for _G_dir
        do
          func_append_uniq gnulib_tool_base_options " --local-dir=$_G_dir"
        done
      }
      $require_source_base
      test -n "$source_base" \
          && func_append_uniq gnulib_tool_base_options " --source-base=$source_base"
    }

    require_gnulib_tool_base_options=:
}


# require_libtoolize
# ------------------
# Skip libtoolize if it's not needed.
require_libtoolize=func_require_libtoolize
func_require_libtoolize ()
{
    $debug_cmd

    # Unless we're not searching for libtool use by this package, set
    # LIBTOOLIZE to true if none of 'LT_INIT', 'AC_PROG_LIBTOOL' and
    # 'AM_PROG_LIBTOOL' are used in configure.
    test true = "$LIBTOOLIZE" || {
      func_extract_trace LT_INIT
      test -n "$func_extract_trace_result" || func_extract_trace AC_PROG_LIBTOOL
      test -n "$func_extract_trace_result" || func_extract_trace AM_PROG_LIBTOOL
      test -n "$func_extract_trace_result" || LIBTOOLIZE=true
    }

    test -n "$LIBTOOLIZE" || {
      # Find libtoolize, named glibtoolize in Mac Ports, but prefer
      # user-installed libtoolize to ancient glibtoolize shipped by
      # Apple with Mac OS X when Mac Ports is not installed.
      func_find_tool LIBTOOLIZE libtoolize glibtoolize
    }

    test -n "$LIBTOOLIZE" || func_fatal_error "\
Please install GNU Libtool, or 'export LIBTOOLIZE=/path/to/libtoolize'."

    func_verbose "export LIBTOOLIZE='$LIBTOOLIZE'"

    # Make sure the search result is visible to subshells
    export LIBTOOLIZE

    require_libtoolize=:
}


# require_local_gl_path
# ---------------------
# Ensure local_gl_path has a sensible value, extracted from 'gnulib-cache.m4' if
# possible, otherwise letting 'gnulib-tool' pick a default.
require_local_gl_path=func_require_local_gl_path
func_require_local_gl_path ()
{
    $debug_cmd

    $require_gnulib_cache

    # Compat with older bootstrap versions.
    test -n "$local_gl_dir" && {
      func_warning settings "\
Please use 'local_gl_path' instead of 'local_gl_dir' in your
'bootstrap.conf' file."
      local_gl_path=$local_gl_dir
      local_gl_dir=
    }

    test -f "$gnulib_cache" && test -z "$local_gl_path" && {
      func_extract_trace_first "gl_LOCAL_DIR" "$gnulib_cache"
      local_gl_path=$func_extract_trace_first_result
      test -n "$local_gl_path" && func_verbose "local_gl_path='$local_gl_path'"
    }

    test -z "$local_gl_path_quoted" && test -n "$local_gl_path" && {
      save_IFS=$IFS
      set dummy
      # Don't use PATH_SEPARATOR here, gnulib must be fixed to store only ':' as
      # path separator into gnulib-cache.m4 (consistency reasons among systems).
      IFS=:
      for _G_dir in $local_gl_path
      do
        set "$@" "$_G_dir"
      done
      shift
      IFS=$save_IFS
      func_quote eval "$@"
      local_gl_path_quoted=$func_quote_result
    }

    require_local_gl_path=:
}


# require_macro_dir
# -----------------
# Ensure that '$macro_dir' is set, and if it doesn't already point to an
# existing directory, create one.
require_macro_dir=func_require_macro_dir
func_require_macro_dir ()
{
    $debug_cmd

    # Sometimes this is stored in 'configure.ac'.
    test -n "$macro_dir" || {
      # AC_CONFIG_MACRO_DIRS takes a space delimited list of directories,
      # but we only care about the first one in bootstrap.
      func_extract_trace_first AC_CONFIG_MACRO_DIRS
      macro_dir=`expr "x$func_extract_trace_first_result" : 'x\([^	 ]*\)'`
    }
    test -n "$macro_dir" || {
      func_extract_trace_first AC_CONFIG_MACRO_DIR
      macro_dir=$func_extract_trace_first_result
    }

    # Otherwise we might find it in 'Makefile.am'.
    test -n "$macro_dir" || {
      $require_aclocal_amflags

      # Take the argument following the first '-I', if any.
      _G_minus_I_seen=false
      for _G_arg in $aclocal_amflags; do
        case $_G_minus_I_seen,$_G_arg in
          :,*)   macro_dir=$_G_arg; break ;;
          *,-I)  _G_minus_I_seen=: ;;
          *,-I*) macro_dir=`expr x$_G_arg : 'x-I\(.*\)$'`; break ;;
        esac
      done
    }

    func_verbose "macro_dir='$macro_dir'"

    func_check_configuration macro_dir \
        "AC_CONFIG_MACRO_DIRS([name of a directory for configure m4 files])"

    $require_vc_ignore_files

    # If the macro_dir directory doesn't exist, create it now, and mark it
    # as ignored for the VCS.
    if test ! -d "$macro_dir"; then
      mkdir "$macro_dir" || func_permissions_error "$macro_dir"

      test -n "$vc_ignore_files" \
        || func_insert_if_absent "$macro_dir" $vc_ignore_files
    fi

    require_macro_dir=:
}


# require_makefile_am
# -------------------
# Ensure there is a 'Makefile.am' in the current directory.
require_makefile_am=func_require_makefile_am
func_require_makefile_am ()
{
    $debug_cmd

    test -n "$makefile_am" \
      || makefile_am=Makefile.am

    <"$makefile_am"

    func_verbose "found '$makefile_am'"

    require_makefile_am=:
}


# require_package
# ---------------
# Ensure that '$package' contains a sensible default value.
require_package=func_require_package
func_require_package ()
{
    $debug_cmd

    test -n "$package" || {
      $require_package_name

      package=`echo "$package_name" \
        |$SED -e 's/GNU //' \
	      -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
    }

    func_verbose "package='$package'"

    require_package=:
}


# require_package_bugreport
# -------------------------
# Ensure that this has a sensible value, extracted from 'configure.ac'
# if appropriate (and possible!).
require_package_bugreport=func_require_package_bugreport
func_require_package_bugreport ()
{
    $debug_cmd

    func_extract_trace AC_INIT

    save_ifs=$IFS
    IFS=:
    set dummy $func_extract_trace_result
    IFS=$save_ifs
    shift

    test -n "$package_bugreport" || package_bugreport=$3
    func_check_configuration package_bugreport \
      "AC_INIT([$package_name], [$package_version], [bug-$package@gnu.org])"
    func_verbose "package_bugreport='$package_bugreport'"

    require_package_bugreport=:
}


# require_package_name
# --------------------
# Ensure that this has a sensible value, extracted from 'configure.ac'
# if appropriate (and possible!).
require_package_name=func_require_package_name
func_require_package_name ()
{
    $debug_cmd

    func_extract_trace AC_INIT

    save_ifs=$IFS
    IFS=:
    set dummy $func_extract_trace_result
    IFS=$save_ifs
    shift

    test -n "$package_name" || package_name=$1
    func_check_configuration package_name \
      "AC_INIT([name of your package], [package version number])"
    func_verbose "package_name='$package_name'"

    require_package_name=:
}


# require_package_version
# -----------------------
# Ensure that this has a sensible value, extracted from 'configure.ac'
# if appropriate (and possible!).  While we might have set all the
# parameters extracted from AC_INIT at once, 'package_version' in
# particular is not necessarily available as early as the others, since
# 'git-version-gen' is often involved, and until then we can't rely on
# getting a correct version number from an AC_INIT extraction.
require_package_version=func_require_package_version
func_require_package_version ()
{
    $debug_cmd

    func_extract_trace AC_INIT

    save_ifs=$IFS
    IFS=:
    set dummy $func_extract_trace_result
    IFS=$save_ifs
    shift

    test -n "$package_version" || package_version=$2
    test -n "$package_version" || {
      # The embedded echo is to squash whitespace before globbing.
      case " "`echo $gnulib_modules`" " in
	*" git-version-gen "*)
	  func_fatal_error "\
cannot \$require_package_version in bootstrap.conf before
func_gnulib_tool has installed the 'git-version-gen' script."
	  ;;
	*)
          func_check_configuration package_version \
            "AC_INIT([name of your package], [package version number])"
	  ;;
      esac
    }
    func_verbose "package_version='$package_version'"

    require_package_version=:
}


# require_patch
# -------------
# Find patch, according to the PATCH environment variable, or else
# searching the user's PATH.
require_patch=func_require_patch
func_require_patch ()
{
    $debug_cmd

    test -n "$PATCH" || {
      # Find a patch program, preferring gpatch, which is usually better
      # than the vendor patch.
      func_find_tool PATCH gpatch patch
    }

    test -n "$PATCH" || func_fatal_error "\
Please install GNU Patch, or 'export PATCH=/path/to/gnu/patch'."

    func_verbose "export PATCH='$PATCH'"

    # Make sure the search result is visible to subshells
    export PATCH

    require_patch=:
}


# require_source_base
# -------------------
# Ensure that source_base has a sensible value, extracted from
# 'gnulib-cache.m4' if possible.
require_source_base=func_require_source_base
func_require_source_base ()
{
    $debug_cmd

    $require_gnulib_cache

    test -f "$gnulib_cache" && test -z "$source_base" && {
      func_extract_trace_first "gl_SOURCE_BASE" "$gnulib_cache"

      source_base=$func_extract_trace_first_result

      func_verbose "source_base='$source_base'"
    }

    require_source_base=:
}


# require_vc_ignore_files
# -----------------------
# Ensure that '$vc_ignore' has been processed to list VCS ignore files
# in '$vc_ignore_files'
require_vc_ignore_files=func_require_vc_ignore_files
func_require_vc_ignore_files ()
{
    $debug_cmd

    test -n "$vc_ignore" || vc_ignore=auto

    if test auto = "$vc_ignore" && test -z "$vc_ignore_files"; then
      vc_ignore_files=
      test -d .git && vc_ignore_files=.gitignore
      test -d CVS && vc_ignore_files="$vc_ignore_files .cvsignore"
    else
      vc_ignore_files=$vc_ignore
    fi

    func_verbose "vc_ignore_files='$vc_ignore_files'"

    require_vc_ignore_files=:
}


## ----------------- ##
## Helper functions. ##
## ----------------- ##

# This section contains the helper functions used by the rest of 'bootstrap'.

# func_len STRING
# ---------------
# STRING may not start with a hyphen.
if (eval 'x=123; test x${#x} = "x3"') 2>/dev/null
then
  # This is an XSI compatible shell, allowing a faster implementation...
  eval 'func_len ()
  {
    $debug_cmd

    func_len_result=${#1}
  }'
else
  # ...otherwise fall back to using expr, which is often a shell builtin.
  func_len ()
  {
    $debug_cmd

    func_len_result=`expr "$1" : ".*" 2>/dev/null || echo 0`
  }
fi


# func_cmp_s FILE1 FILE2
# ----------------------
# Return non-zero exit status unless FILE1 and FILE2 are identical, without
# any output at all, even error messages.
func_cmp_s ()
{
    $debug_cmd

    # This function relies on non-zero exit status, which will cause the
    # program to exit when running in 'set -e' mode.
    $CMP "$@" >/dev/null 2>&1
}


# func_grep_q EXPRESSION [FILENAME..]
# -----------------------------------
# Check whether EXPRESSION matches any line of any listed FILENAME,
# without any output at all, even error messages.
func_grep_q ()
{
    $debug_cmd

    # This function relies on non-zero exit status, which will cause the
    # program to exit when running in 'set -e' mode.
    $GREP "$@" >/dev/null 2>&1
}


# func_ifcontains LIST MEMBER YES-CMD [NO-CMD]
# --------------------------------------------
# If whitespace-separated LIST contains MEMBER then execute YES-CMD,
# otherwise if NO-CMD was given, execute that.
func_ifcontains ()
{
    $debug_cmd

    _G_wslist=$1
    _G_member=$2
    _G_yes_cmd=$3
    _G_no_cmd=${4-":"}

    _G_found=false
    for _G_item in $_G_wslist; do
      test "x$_G_item" = "x$_G_member" && {
        _G_found=:
	break
      }
    done
    if $_G_found; then
      eval "$_G_yes_cmd"
      _G_status=$?
    else
      eval "$_G_no_cmd"
      _G_status=$?
    fi

    test 0 -eq "$_G_status" || exit $_G_status
}


# func_strpad STR WIDTH CHAR
# --------------------------
# Trim STR, or pad with CHAR to force a total length of WIDTH.
func_strpad ()
{
    $debug_cmd

    _G_width=`expr "$2" - 1`
    func_strpad_result=`$ECHO "$1" |$SED '
        :a
        s|^.\{0,'"$_G_width"'\}$|&'"$3"'|
        ta
    '`
}


# func_strrpad STR WIDTH CHAR
# ---------------------------
# Trim STR, or right-justify-pad with CHAR to force a total length of
# WIDTH.
func_strrpad ()
{
    $debug_cmd

    _G_width=`expr "$2" - 1`
    func_strrpad_result=`$ECHO "$1" |$SED '
        :a
        s|^.\{0,'"$_G_width"'\}$|'"$3"'&|
        ta
    '`
}


# func_strrow INDENT FIELD WIDTH [FIELDn WIDTHn]...
# -------------------------------------------------
# Return a string containing each FIELD left justified to WIDTH, with
# the whole thing indented by INDENT spaces.  This function is used to
# render one row of aligned columns for a table by func_strtable().
func_strrow ()
{
    $debug_cmd

    func_strrow_linelen=$1; shift

    _G_row=
    while test $# -gt 0; do
      func_strrow_linelen=`expr $func_strrow_linelen + $2`
      func_strpad "$1" $2 " "
      func_append _G_row "$func_strpad_result"
      shift; shift
    done

    func_strrpad "$_G_row" $func_strrow_linelen " "
    func_strrow_result=$func_strrpad_result
}


# func_strtable INDENT WIDTH1...WIDTHn HEADER1...HEADERn FIELD1...FIELDn
# ----------------------------------------------------------------------
# Generate a string of newline-separated rows arranged in lined-up
# columns of the given WIDTHs, with the entire table indented by INDENT
# spaces.  The number of columns is determined by the number of integer
# valued WIDTH arguments following INDENT.  The next set (i.e. a number
# of arguments equal to the number of WIDTH arguments) of fields are
# treated as the table's column HEADERs, and are separated from the
# remainder of the table by an indented row of '-' characters. Remaining
# arguments are each aligned below the next available header, wrapping
# to a new row as necessary.  Finally another row of '-' characters is
# added to mark the end of the table.
#
# For example an unindented 3 column table with 2 rows of data would be
# generated by this call:
#
#    func_strtable 3 20 10 25 \
#        Header1 Header2 Header3 \
#        Row1Col1 Row1Col2 Row1Col3 \
#        Row2Col1 Row2Col2 Row2Col3
#
# returning the following string:
#
# "   Header1             Header2   Header3
#     -------------------------------------------------------
#     Row1Col1            Row1Col2  Row1Col3
#     Row2Col1            Row2Col2  Row2Col3
#     -------------------------------------------------------"
func_strtable ()
{
    $debug_cmd

    # Save the indent value, we'll need it for each row we render.
    _G_indent=$1; shift

    # Collect remaining numeric args into a list for reuse between
    # members of each row when we call func_strrow later.
    _G_widths=$1; shift
    while test 0 -lt `expr "$1" : '[1-9][0-9]*$'`; do
      func_append _G_widths " $1"; shift
    done

    # Extract the same number of positional parameters as there are
    # width elements - we'll do the header rows separately so that
    # we can insert a divider line.
    _G_header=$_G_indent
    for _G_width in $_G_widths; do
      func_append _G_header " $1 $_G_width"; shift
    done
    func_strrow $_G_header

    # Strip off the indent, and make a divider with '-' chars, then
    # reindent.
    _G_divider=`$ECHO "$func_strrow_result" \
        |$SED 's|[^ ]|-|g
            :a
            s|- |--|g
            ta
        '`

    # Append the header and divider to the running result.
    func_append func_strtable_result "\
$func_strrow_result
$_G_divider
"

    # The remaining rows are zipped between the width values we
    # unwound earlier just like the header row above.
    while test $# -gt 0; do
      _G_row=$_G_indent
      for _G_width in $_G_widths; do
        func_append _G_row " $1 $_G_width"; shift
      done
      func_strrow $_G_row
      func_append func_strtable_result "\
$func_strrow_result
"
    done

    # Mark the end of the table with a final divider line.
    func_append func_strtable_result "$_G_divider"
}


# func_internal_error ARG...
# --------------------------
# Echo program name prefixed message to standard error, and exit.
func_internal_error ()
{
    func_fatal_error "\
INTERNAL: " ${1+"$@"} "
          Please report this bug to 'bug-gnulib@gnu.org'
          in as much detail as possible."
}


# func_permissions_error FILE-OR-DIRECTORY
# ----------------------------------------
# Echo program name prefixed permissions error message to standard
# error, and exit.
func_permissions_error ()
{
    $debug_cmd

    func_fatal_error "Failed to create '$1', check permissions."
}


# func_show_eval CMD [FAIL_EXP]
# -----------------------------
# Unless opt_silent is true, then output CMD.  Then, if opt_dryrun is
# not true, evaluate CMD.  If the evaluation of CMD fails, and FAIL_EXP
# is given, then evaluate it.
func_show_eval ()
{
    $debug_cmd

    $require_term_colors

    _G_cmd=$1
    _G_fail_exp=${2-':'}

    ${opt_silent-'false'} || {
      func_quote eval $_G_cmd
      eval func_truncate_cmd $func_quote_result
      func_echo "running: $tc_bold$func_truncate_cmd_result$tc_reset"
    }

    ${opt_dry_run-'false'} || {
      eval "$_G_cmd"
      _G_status=$?
      test 0 -eq "$_G_status" || eval "(exit $_G_status); $_G_fail_exp"
    }
}


# func_truncate_cmd CMD [ARG]...
# ------------------------------
# For unreasonably long commands (such as a gnulib-tool invocation with
# the full module list for import), truncate CMD after the second non-
# option ARG.
func_truncate_cmd ()
{
    $debug_cmd

    _G_last_arg_opt_p=false
    func_truncate_cmd_result=

    set dummy "$@"; shift

    while test $# -gt 0; do
      _G_opt=$1; shift

      test -n "$func_truncate_cmd_result" \
          && func_append func_truncate_cmd_result ' '
      func_append func_truncate_cmd_result "$_G_opt"

      func_len "x$func_truncate_cmd_result"

      case $_G_opt in
        -*) _G_last_arg_opt_p=: ;;
        *)  $_G_last_arg_opt_p \
                || test "$min_cmd_len" -gt "$func_len_result" \
                || break
            _G_last_arg_opt_p=false
            ;;
      esac
    done

    test $# -gt 0 && func_append func_truncate_cmd_result "..."
}


# func_gitignore_entries FILE...
# ------------------------------
# Strip blank and comment lines to leave significant entries.
func_gitignore_entries ()
{
    $debug_cmd

    $SED -e '/^#/d' -e '/^$/d' "$@"
}


# func_insert_if_absent STR FILE...
# ---------------------------------
# If $STR is not already on a line by itself in $FILE, insert it, at the
# start.  Entries are inserted at the start of the ignore list to ensure
# existing entries starting with ! are not overridden.  Such entries
# support whilelisting exceptions after a more generic blacklist pattern.
# sorting the new contents of the file and replacing $FILE with the result.
func_insert_if_absent ()
{
    $debug_cmd

    str=$1
    shift

    for file
    do
      test -f "$file" || touch "$file"

      duplicate_entries=`func_gitignore_entries "$file" |sort |uniq -d`
      test -n "$duplicate_entries" \
          && func_error "duplicate entries in $file: " $duplicate_entries

      func_grep_q "^$str\$" "$file" \
          || func_verbose "inserting '$str' into '$file'"

      linesold=`func_gitignore_entries "$file" |wc -l`
      linesnew=`{ $ECHO "$str"; cat "$file"; } \
                |func_gitignore_entries |sort -u |wc -l`
      test "$linesold" -eq "$linesnew" \
        || { $SED "1i\\$nl$str$nl" "$file" >"$file"T && mv "$file"T "$file"; } \
        || func_permissions_error "$file"
    done
}


# func_get_version APP
# --------------------
# echo the version number (if any) of APP, which is looked up along your
# PATH.
func_get_version ()
{
    $debug_cmd

    _G_app=$1

    # Rather than uncomment the sed script in-situ, strip the comments
    # programmatically before passing the result to $SED for evaluation.
    sed_get_version=`$ECHO '# extract version within line
          s|.*[v ]\{1,\}\([0-9]\{1,\}\.[.a-z0-9-]*\).*|\1|
          t done

          # extract version at start of line
          s|^\([0-9]\{1,\}\.[.a-z0-9-]*\).*|\1|
          t done

          d

          :done
          # the following essentially does s|5.005|5.5|
          s|\.0*\([1-9]\)|.\1|g
          p
          q' \
    |$SED '/^[	 ]*#.*$/d'`

    func_tool_version_output $_G_app >/dev/null
    _G_status=$?

    test 0 -ne "$_G_status" \
      || $_G_app --version 2>&1 |$SED -n "$sed_get_version"

    (exit $_G_status)
}


# func_check_tool APP
# -------------------
# Search PATH for an executable at APP.
func_check_tool ()
{
    $debug_cmd

    func_check_tool_result=

    case $1 in
    *[\\/]*)
      test -x "$1" && func_check_tool_result=$1
      ;;
    *)
      save_IFS=$IFS
      IFS=${PATH_SEPARATOR-:}
      for _G_check_tool_path in $PATH; do
        IFS=$save_IFS
	if test -x "$_G_check_tool_path/$1"; then
	  func_check_tool_result=$_G_check_tool_path/$1
	  break
	fi
      done
      IFS=$save_IFS
      ;;
    esac
}


# func_check_versions APP1 VER1 URL1 ...[APPN VERN URLN]
# ------------------------------------------------------
func_check_versions ()
{
    $debug_cmd

    func_check_versions_result=:

    while test $# -gt 0; do
      _G_app=$1; shift
      _G_reqver=$1; shift
      _G_url=$1; shift

      # Diagnose bad buildreq formatting.
      case $_G_url in
      [a-z]*://*) ;; # looks like a url
      *) func_fatal_error "\
'$_G_url' from the buildreq table in
'bootstrap.conf' does not look like the URL for downloading
$_G_app. Please ensure that buildreq is a strict newline
delimited list of triples; 'program min-version url'."
        ;;
      esac

      # Honor $APP variables ($TAR, $AUTOCONF, etc.)
      _G_appvar=`echo $_G_app |tr '[a-z-]' '[A-Z_]'`
      test TAR = "$_G_appvar" && _G_appvar=AMTAR
      eval "_G_app=\${$_G_appvar-$_G_app}"

      # Fail if no version specified, but the program can't be found.
      if test x- = "x$_G_reqver"; then
        func_check_tool $_G_app
	if test -z "$func_check_tool_result"; then
	  func_error "Prerequisite '$_G_app' not not found. Please install it, or
'export $_G_appvar=/path/to/$_G_app'."
          func_check_versions_result=false
	else
	  func_verbose "found '$func_check_tool_result' for $_G_appvar."
	fi
      else
        _G_instver=`func_get_version $_G_app`

        # Fail if --version didn't work.
        if test -z "$_G_instver"; then
          func_error "Prerequisite '$_G_app' not found. Please install it, or
'export $_G_appvar=/path/to/$_G_app'."
          func_check_versions_result=false

        # Fail if a newer version than what we have is required.
        else
          func_verbose "found '$_G_app' version $_G_instver."

	  case $_G_reqver in
            =*)
              # If $buildreq version starts with '=', version must
	      # match the installed program exactly.
	      test "x$_G_reqver" = "x=$_G_instver" || {
	        func_error "\
  '$_G_app' version == $_G_instver is too old
  'exactly $_G_app-$_G_reqver is required"
                func_check_versions_result=false
              }
	      ;;
	    *)
              # Otherwise, anything that is not older is a match.
              func_lt_ver "$_G_reqver" "$_G_instver" || {
                func_error "\
  '$_G_app' version == $_G_instver is too old
  '$_G_app' version >= $_G_reqver is required"
            func_check_versions_result=false
              }
	      ;;
	  esac
        fi
      fi
    done
}


# func_cleanup_gnulib
# -------------------
# Recursively delete everything below the path in the global variable
# GNULIB_PATH.
func_cleanup_gnulib ()
{
    $debug_cmd

    _G_status=$?
    $RM -fr "$gnulib_path"
    exit $_G_status
}


# func_download_po_files SUBDIR DOMAIN
# ------------------------------------
func_download_po_files ()
{
    $debug_cmd

    func_echo "getting translations into $1 for $2..."
    _G_cmd=`printf "$po_download_command_format" "$2" "$1"`
    eval "$_G_cmd"
}


# func_update_po_files PO_DIR DOMAIN
# ----------------------------------
# Mirror .po files to $po_dir/.reference and copy only the new
# or modified ones into $po_dir.  Also update $po_dir/LINGUAS.
# Note po files that exist locally only are left in $po_dir but will
# not be included in LINGUAS and hence will not be distributed.
func_update_po_files ()
{
    $debug_cmd

    # Directory containing primary .po files.
    # Overwrite them only when we're sure a .po file is new.
    _G_po_dir=$1
    _G_domain=$2

    # Mirror *.po files into this dir.
    # Usually contains *.s1 checksum files.
    _G_ref_po_dir=$_G_po_dir/.reference

    test -d "$_G_ref_po_dir" || mkdir $_G_ref_po_dir || return
    func_download_po_files $_G_ref_po_dir $_G_domain \
      && ls "$_G_ref_po_dir"/*.po 2>/dev/null \
         |$SED -e 's|.*/||' -e 's|\.po$||' > "$_G_po_dir/LINGUAS" || return

    # Find sha1sum, named gsha1sum on MacPorts, and shasum on MacOS 10.6+.
    func_find_tool SHA1SUM sha1sum gsha1sum shasum sha1

    test -n "$SHA1SUM" || func_fatal_error "\
Please install GNU Coreutils, or 'export SHA1SUM=/path/to/sha1sum'."

    _G_langs=`cd $_G_ref_po_dir && echo *.po|$SED 's|\.po||g'`
    test '*' = "$_G_langs" && _G_langs=x
    for _G_po in $_G_langs; do
      case $_G_po in x) continue;; esac
      _G_new_po=$_G_ref_po_dir/$_G_po.po
      _G_cksum_file=$_G_ref_po_dir/$_G_po.s1
      if ! test -f "$_G_cksum_file" ||
          ! test -f "$_G_po_dir/$_G_po.po" ||
          ! $SHA1SUM -c "$_G_cksum_file" \
              < "$_G_new_po" > /dev/null; then
        echo "updated $_G_po_dir/$_G_po.po..."
        cp "$_G_new_po" "$_G_po_dir/$_G_po.po" \
          && $SHA1SUM < "$_G_new_po" > "$_G_cksum_file" || return
      fi
    done
}



## --------------- ##
## Option parsing. ##
## --------------- ##

# Hook in the functions to make sure our own options are parsed during
# the option parsing loop.

usage='$progpath [OPTION]...'

# Short help message in response to '-h'.  Add to this in 'bootstrap.conf'
# if you accept any additional options.
usage_message="Common Bootstrap Options:
   -c, --copy         copy files instead of creating symbolic links.
       --debug        enable verbose shell tracing
   -n, --dry-run      print commands rather than running them
   -f, --force        attempt to bootstrap even if the sources seem not
                      to have been checked out.
       --gnulib-srcdir=DIRNAME
                      specify a local directory where gnulib sources
                      reside. Use this if you already have the gnulib
                      sources on your machine, and don't want to waste
                      your bandwidth downloading them again.  Defaults to
                      \$GNULIB_SRCDIR.
       --no-warnings  equivalent to '-Wnone'
       --skip-git     do not fetch files from remote repositories
       --skip-po      do not download po files.
   -v, --verbose      verbosely report processing
       --version      print version information and exit
   -W, --warnings=CATEGORY
                      report the warnings falling in CATEGORY [all]
   -h, --help         print short or long help message and exit
"

# Additional text appended to 'usage_message' in response to '--help'.
long_help_message=$long_help_message"
       'recommend'    show warnings about missing recommended packages
       'settings'     show warnings about missing '$progname.conf' settings
       'upgrade'      show warnings about out-dated files

If the file '$progname.conf' exists in the same directory as this
script, its contents are read as shell variables to configure the
bootstrap.

For build prerequisites, environment variables like \$AUTOCONF and
\$AMTAR are honored.

Running without arguments will suffice in most cases.
"

# Warning categories used by 'bootstrap', append others if you use them
# in your 'bootstrap.conf'.
warning_categories='recommend settings upgrade'


# bootstrap_options_prep [ARG]...
# -------------------------------
# Preparation for options parsed by Bootstrap.
bootstrap_options_prep ()
{
    $debug_cmd

    # Option defaults:
    opt_copy=${copy-'false'}
    opt_dry_run=false
    opt_force=false
    opt_gnulib_srcdir=$GNULIB_SRCDIR
    opt_skip_git=false
    opt_skip_po=false

    # Pass back the list of options we consumed.
    func_quote eval ${1+"$@"}
    bootstrap_options_prep_result=$func_quote_result
}
func_add_hook func_options_prep bootstrap_options_prep


# bootstrap_parse_options [ARG]...
# --------------------------------
# Provide handling for Bootstrap specific options.
bootstrap_parse_options ()
{
    $debug_cmd

    # Perform our own loop to consume as many options as possible in
    # each iteration.
    while test $# -gt 0; do
      _G_opt=$1
      shift
      case $_G_opt in
        --dry-run|--dryrun|-n)
                      opt_dry_run=: ;;
        --copy|-c)    opt_copy=: ;;
        --force|-f)   opt_force=: ;;

        --gnulib-srcdir)
                      test $# = 0 && func_missing_arg $_G_opt && break
                      opt_gnulib_srcdir=$1
                      shift
                      ;;

        --skip-git|--no-git)
                      opt_skip_git=:
                      ;;

        --skip-po|--no-po)
                      opt_skip_po=:
                      ;;

        # Separate non-argument short options:
        -c*|-f*|-n*)
                      func_split_short_opt "$_G_opt"
                      set dummy "$func_split_short_opt_name" \
                          "-$func_split_short_opt_arg" ${1+"$@"}
                      shift
                      ;;

        *)            set dummy "$_G_opt" ${1+"$@"}; shift; break ;;
      esac
    done

    # save modified positional parameters for caller
    func_quote eval ${1+"$@"}
    bootstrap_parse_options_result=$func_quote_result
}
func_add_hook func_parse_options bootstrap_parse_options


# bootstrap_validate_options [ARG]...
# -----------------------------------
# Perform any sanity checks on option settings and/or unconsumed
# arguments.
bootstrap_validate_options ()
{
    $debug_cmd

    # Validate options.
    test $# -gt 0 \
        && func_fatal_help "too many arguments"

    # Pass back the (empty) list of unconsumed options.
    func_quote eval ${1+"$@"}
    bootstrap_validate_options_result=$func_quote_result
}
func_add_hook func_validate_options bootstrap_validate_options


## -------------------------------------------------- ##
## Source package customisations in 'bootstrap.conf'. ##
## -------------------------------------------------- ##

# Override the default configuration, if necessary.
# Make sure that bootstrap.conf is sourced from the current directory
# if we were invoked as "sh bootstrap".
case $0 in
  */*) test -r "$0.conf" && . "$0.conf" ;;
  *) test -r "$0.conf" && . ./"$0.conf" ;;
esac


## ------------------------------- ##
## Actually perform the bootstrap. ##
## ------------------------------- ##

func_bootstrap ${1+"$@"}

# The End.
exit ${exit_status-$EXIT_SUCCESS}

# Local variables:
# mode: shell-script
# sh-indentation: 2
# eval: (add-hook 'before-save-hook 'time-stamp)
# time-stamp-pattern: "500/scriptversion=%:y-%02m-%02d.%02H; # UTC"
# time-stamp-time-zone: "UTC"
# End:
