#!/bin/sh

# pyccopy:   a build-time utiltiy script
# objective: copy one or more source python (.py) scripts
#            to the destination directory specified via the
#            environment variable PYCOPY_DSTDIR, replacing
#            the original shebang line, should the script
#            contain one, with a program interpreter based
#            on the PYCOPY_PREFIX and PYCOPY_PYTHON
#            environment variables.

if [ -z "$PYCOPY_PYTHON" ]; then
	python='python'
else
	python="$PYCOPY_PYTHON"
fi

if [ -z "$PYCOPY_PREFIX" ]; then
	prefix='/usr'
else
	prefix="$PYCOPY_PREFIX"
fi

if [ -z "$PYCOPY_DSTDIR" ]; then
	dstdir='.'
else
	dstdir="$PYCOPY_DSTDIR"
fi

for pysrc in $@; do
	basename=$(basename "$pysrc");

	sed -e '1s@^#!.*@#!'" $prefix/bin/$python"'@g'   \
		"$pysrc" > "$dstdir/$basename"          || exit 2

	if [ "$(head -n1 "$dstdir/$basename")" = "#! $prefix/bin/$python" ]; then
		chmod +x "$dstdir/$basename"            || exit 2
	fi
done

exit 0