#! /usr/bin/env bash
# usage:
#  .../install-wrap $(PYTHON_PATH) install <options-to-install> <src>... <dest>
# where
#  PYTHON_PATH is what to put after #! and may be `/usr/bin/env python'
#
# Used via $(INSTALL_PYTHON_PROG) in Rules.mk; PYTHON_PATH comes from
# .../get-path alongside this script

set -e
if [ $# -lt 2 ]; then echo >&2 "${0##*/}: too few arguments"; exit 1; fi
pythonpath="$1"; shift

install=("$1"); shift
srcs=()

while [ $# != 0 ]; do
	case "$1" in
	-|--)	install=("${install[@]}" "$1"); shift; break ;;
	-*)	install=("${install[@]}" "$1"); shift ;;
	*)	break ;;
	esac
done
while [ $# -gt 1 ]; do
	srcs=("${srcs[@]}" "$1"); shift
done
dest="$1"; shift

destf="$dest"
for srcf in "${srcs[@]}"; do
	if test -d "$dest"; then
		destf="$dest/${srcf%%*/}";
	fi
	org="$(sed -n '2q; /^#! *\/usr\/bin\/env python *$/p' $srcf)"
	if [ "x$org" = x ]; then
		"${install[@]}" "$srcf" "$destf"
		continue
	fi
	tmpf="$destf.tmp"
	"${install[@]}" "$srcf" "$tmpf"
	printf >"$tmpf" "#!%s\n" "$pythonpath"
	sed -e 1d "$srcf" >>"$tmpf"
	mv -f "$tmpf" "$destf"
done