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#!@KSH@ -p

#

# Either bash or ksh will be ok for this; requires (( )) arithmetic

#  (-p above just says to not parse $ENV file; makes it faster for

#   those of us who set $ENV)

#

# install files if they have changed by running 'cmp', then 'install'

#   as necessary.

#

#  Optionally, can append a suffix before last existing suffix (if any)

#

# NOTE

#   We avoid using typical install(1M) programs since they have

#   large variability across systems and we also need to support ou

#   -V option.

#   So we just copy and chmod by hand.

#

# $Id: install-if-change.in,v 1.2 2001-09-27 12:02:53 chris Exp $

#

progname=`basename $0`

#progname=${0##*/}        # fast basename hack for ksh, bash

USAGE=\

"usage: $progname [ -vmV ] file [ file ... ] dest-directory-or-file

        -v          -- verbose

        -V suffix   -- suffix to append to targets (before any . suffix)

                        eg: -V _g would change 'foo' to 'foo_g' and

                                               'libfoo.a' to 'libfoo_g.a'

        -m mode     -- mode for new file(s)"

fatal() {

    if [ "$1" ]

    then

        echo $* >&2

    fi

    echo "$USAGE" 1>&2

    exit 1

}

#

# process the options

#

verbose=""

suffix=""

mode=""

while getopts vm:V: OPT

do

    case "$OPT" in

        v)

            verbose="yes";;

        V)

            eval suffix=$OPTARG;;

        m)

            mode="$OPTARG";;

        *)

            fatal

    esac

done

shiftcount=`expr $OPTIND - 1`

shift $shiftcount

args=$*

#

# Separate source file(s) from dest directory or file

#

files=""

dest=""

for d in $args

do

    files="$files $dest"

    dest=$d

done

if [ ! "$files" ] || [ ! "$dest" ]

then

    fatal "missing files or invalid destination"

fi

#

# Process the arguments

#

targets=""

for f in $files

do

    # leaf=`basename $f`

    leaf=${f##*/}        # fast basename hack for ksh, bash

    target=$dest

    if [ -d $dest ]

    then

        # if we were given a suffix, then add it as appropriate

        if [ "$suffix" ]

        then

            case $f in

                *.*)

                    # leaf=`echo $leaf |

                    #   /bin/sed "s/\([~\.]*\)\.\(.*\)$/\1$suffix.\2/"`

                    # ksh,bash hack for above sed script

                    leaf=${leaf%%.*}$suffix.${leaf#*.}

                    [ "$verbose" = "yes" ] &&

                      echo "$progname: $f will be installed as $leaf"

                    ;;

                *)

                    leaf=$leaf$suffix;;

            esac

        fi

        target=$target/$leaf

    fi

    [ ! -r $f ] && fatal "can not read $f"

    if cmp -s $f $target

    then

        [ "$verbose" = "yes" ] && echo "'$f' not newer than '$target'"

    else

        [ "$verbose" = "yes" ] && echo "rm -f $target"

        rm -f $target

        echo "cp -p $f $target"

        cp -p $f $target || exit 1

        targets="$targets $target"    # keep list for chmod below

    fi

done

if [ "$mode" -a "$targets" ]

then

     [ "$verbose" = "yes" ] && echo "chmod $mode $targets"

     chmod $mode $targets

fi

exit 0

# Local Variables: ***

# mode:ksh ***

# End: ***