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##
##  arx -- Extended archive command
##  Copyright (c) 1999-2008 Ralf S. Engelschall <rse@engelschall.com>
##
##  This file is part of shtool and 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
##  2 of the License, or (at your option) any later version.
##
##  This file 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, write to the Free Software
##  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
##  USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
##

str_tool="arx"
str_usage="[-t|--trace] [-C|--command <cmd>] <op> <archive> [<file> ...]"
arg_spec="2+"
opt_spec="t.C:"
opt_alias="t:trace,C:command"
opt_t=no
opt_C="ar"

. ./sh.common

ar_prg="$opt_C"
ar_cmd="$1"; shift
archive="$1"; shift
files="$*"

#   walk through the file list and expand archives members
ar_tmpdir=`echo $archive | sed -e 's;[^/]*$;.arx;'`
nfiles=''
if [ ".$files" != . ]; then
    for file in $files; do
        if [ ! -f $file ]; then
            echo "$msgprefix:Error: input file not found: $file" 1>&2
            shtool_exit 1
        fi
        case $file in
            *.a )
                if [ ! -d $ar_tmpdir ]; then
                    if [ ".$opt_t" = .yes ]; then
                        echo "mkdir $ar_tmpdir" 1>&2
                    fi
                    mkdir $ar_tmpdir
                fi
                case $ar_tmpdir in
                     .arx )
                         from="../$file"
                         ;;
                     * )
                         dir=`echo $file | sed -e 's;[^/]*$;;' -e 's;\(.\)/$;\1;' -e 's;^$;.;'`
                         base=`echo $file | sed -e 's;.*/\([^/]*\)$;\1;'`
                         from="`cd $dir; pwd`/$base"
                         ;;
                esac
                if [ ".$opt_t" = .yes ]; then
                    echo "(cd $ar_tmpdir && $ar_prg x $from)" 1>&2
                fi
                (cd $ar_tmpdir && eval $ar_prg x $from)
                if [ $? -ne 0 ]; then
                    echo "$msgprefix:Error: member extraction failed for archive: $file" 1>&2
                    shtool_exit 1
                fi
                for member in - `eval $ar_prg t $file | sed -e '/_\.SYMDEF/d'`; do
                    [ ".$member" = .- ] && continue
                    nfiles="$nfiles $ar_tmpdir/$member"
                done
                ;;
            * )
                nfiles="$nfiles $file"
                ;;
        esac
    done
fi

#   run the final archive command
if [ ".$opt_t" = .yes ]; then
    echo "$ar_prg $ar_cmd $archive $nfiles" 1>&2
fi
eval $ar_prg $ar_cmd $archive $nfiles
if [ $? -ne 0 ]; then
    echo "$msgprefix:Error: archive command failed" 1>&2
    shtool_exit $?
fi

#   cleanup and die gracefully
if [ -d $ar_tmpdir ]; then
    if [ ".$opt_t" = .yes ]; then
        echo "rm -rf $ar_tmpdir" 1>&2
    fi
    rm -rf $ar_tmpdir
fi

shtool_exit 0

##
##  manual page
##

=pod

=head1 NAME

B<shtool-arx> - B<GNU shtool> ar(1) extensional command

=head1 SYNOPSIS

B<shtool arx>
[B<-t>|B<--trace>]
[B<-C>|B<--command> I<cmd>]
I<op>
I<archive>
I<file> [I<file> ...]

=head1 DESCRIPTION

B<shtool arx> is a wrapper around the archiving tool ar(1). It provides
the ability to create archives out of existing archives, i.e., if one of
I<file> matches "C<*.a>", the archive member files of I<file> are used
instead of I<file> itself.

The trick of this command is the automatic handling of archive members
which is especially interesting if one wants to construct a (usually
top-level) library archive out of pre-built sub-library archives
(usually staying inside subdirs) in a large source tree. For B<GNU
libtool> based projects, a similar functionality is provided by B<GNU
libtool> internally, too.

=head1 OPTIONS

The following command line options are available.

=over 4

=item B<-t>, B<--trace>

Shows the actually involved shell commands.

=item B<-C>, B<--command> I<cmd>

Set the used ar(1) command to I<cmd> instead of just "ar" (searched in C<$PATH>).

=back

=head1 EXAMPLE

 #   Makefile
 AR=ar
 RANLIB=ranlib
   :
 OBJS=foo.o bar.o
 LIBS=baz/libbaz.a quux/libquux.a
   :
 libfoo.a: $(OBJS) $(LIBS)
     shtool arx -C $(AR) rc libfoo.a $(OBJS) $(LIBS)
     $(RANLIB) libfoo.a

=head1 HISTORY

The B<GNU shtool> B<arx> command was originally written by Ralf S.
Engelschall E<lt>rse@engelschall.comE<gt> in 1999 for B<GNU shtool>. It
was prompted by need to build libraries out of sub-libraries inside the
B<OSSP> project.

=head1 SEE ALSO

shtool(1), ar(1).

=cut