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|
#!/bin/sh
#
# Sed portability notes
# - SuSv3
# - Only -e, -f, and -n are standard options
# - Linux
# - -i argument is of the form -i[ext]
# - extended regular expressions argument is -r
# - Mac OSX
# - -i argument is of the form -i [ext]
# - extended regular expressions argument is -E
#
# Here we support a limited subset of the available sed capabilities,
# ensuring that all those supported by this script can be utilized
# regardless of the current platform.
#
# We accept -n, -e, -f, and -i with no backup extension. We support
# extended regular expressions using the -r argument. Note that extended
# regular expressions support may not be retained, depending upon the
# capabilities of the other platforms we wish to support, and we may need
# to reimplement -i internally in this script on some platforms.
realbin() {
_script=`basename $0`
found=
for bin in `which -a $_script`; do
if ! cmp -s $bin $0; then
found=$bin
break
fi
done
if [ -n "$found" ]; then
echo "$found"
else
return 1
fi
}
quote(){
/usr/bin/sed -e "s,','\\\\'',g; 1s,^,',; \$s,\$,',;" << EOF
$1
EOF
}
save () {
case "$1" in
# when a string contains a "'" we have to escape it
*\'*)
saved="$saved `quote "$1"`"
;;
# otherwise just quote the variable
*)
saved="$saved '$1'"
;;
esac
}
case `uname -s` in
Darwin)
inplace_arg="-i ''"
extended_re_arg="-E"
getopt_os="ir"
;;
Linux)
inplace_arg="-i"
extended_re_arg="-r"
getopt_os="ir"
;;
esac
saved=""
while getopts ne:f:$getopt_os opt; do
case "$opt" in
n)
save "-$opt"
;;
e|f)
save "-$opt"
save "$OPTARG"
;;
i)
saved="$saved $inplace_arg"
continue
;;
r)
saved="$saved $extended_re_arg"
continue
;;
\?)
echo >&2 "Unsupported argument: $OPTARG"
exit 1
;;
esac
done
shift $(($OPTIND - 1))
for arg; do
save "$arg"
done
eval set -- "$saved"
exec `realbin` "$@"
|
