package-subst.in

#!/bin/sh
#
# Usage in Makefile-files:
#
# foo/bar: foo/bar.in package-subst
#          ./package-subst $(srcdir)/foo/bar.in foo/bar [FOO=bar...]
#
# or better (using the interface vars)
#
# foo/bar: foo/bar.in $(PACKAGE_SUBST_DEP)
#          $(PACKAGE_SUBST) $(srcdir)/foo/bar.in foo/bar [FOO=bar...]
#

set -e

if test "x$1$2" = "x" || test "x$2" = "x"
then
    echo "$(basename "$0"): Usage is \`$(basename "$0") INFILE OUTFILE'" >&2
    exit 1
fi

INFILE="$1"
shift

OUTFILE="$1"
shift

# set -x

@MKDIR_P@ "$(dirname "$OUTFILE")"

# Note that the printf(1) is just a hack to print a "-e\n" string in
# any way. ANY way would be OK, but this appears to be the only one,
# as echo(1) insists on interpreting "-e" as a command line option.

IFS='
'
@SED@ \
    $(for v in "$@"; do printf -- '-e\n' && echo "$v" | sed -e 's,\([A-Za-z][A-Za-z0-9_-]*\)=\(.*\),s|\[@\]\1@|\2|,'; done) \
    -e 's|[@]PACKAGE_NAME@|@PACKAGE_NAME@|g' \
    -e 's|[@]PACKAGE_TARNAME@|@PACKAGE_TARNAME@|g' \
    -e 's|[@]PACKAGE_VERSION@|@PACKAGE_VERSION@|g' \
    < "$INFILE" > "$OUTFILE"

head -n1 < "$OUTFILE" > "$OUTFILE.tmp"
trap "rm -f \"$OUTFILE.tmp\"" EXIT
if grep '^#!' "$OUTFILE.tmp" > /dev/null; then
    chmod +x "$OUTFILE"
fi