#!/usr/bin/env bash
set -o errexit


function print_usage() {
	echo "
Usage: $0 [OPTION]

Description: Prepare project build directories for use in scratch.

Options:
 -c	Copy Verilog source code and 3rd party IP to an already existing
	syn/scratch/ directory. Perform no other functions.

 -h	Print this help info.

 -l	Symbolically link project files into the scratch dir instead of copying
	them. Any changes to these file during building will thus be propagated
	back into the repo.

 -L	Symbolically link project directory into the scratch instead of copying
	it. This takes precedents over the '-l'.
"
}

function copy_for_synth() {
	test -d syn/scratch/src || { echo "ERROR: directory 'syn/scratch/src' not found" ; exit 1; }

	# copy verilog code files from hdl directory into syn work dir
	for FILE in $(find ./hdl/ -name "*.v" -type f -print)
	do
		cp -n $FILE ./syn/scratch/src/ || { echo "ERROR duplicate filename ${FILE}" ; exit 1; }
	done

	# copy verilog header files from hdl directory into syn work dir
	for FILE in $(find ./hdl/ -name "*.vh" -type f -print)
	do
		cp -n $FILE ./syn/scratch/src/ || { echo "ERROR duplicate filename ${FILE}" ; exit 1; }
	done

	# copy SystemVerilog code files from hdl directory into syn work dir
	for FILE in $(find ./hdl/ -name "*.sv" -type f -print)
	do
		cp -n $FILE ./syn/scratch/src/ || { echo "ERROR duplicate filename ${FILE}" ; exit 1; }
	done


	# copy 3rd party IP into syn work dir
	test -d ip && { cp -r ip/* syn/scratch/; }

	# populate IP Package hdl directories
	test -d syn/scratch/ip_repo && { find syn/scratch/ip_repo -maxdepth 1 -mindepth 1 -type d | xargs -I D sh -c 'mkdir -p D/hdl; cp syn/scratch/src/* D/hdl/;'; }


	echo "Source files copied to scratch directory"
}


flag_l=
flag_L=

# command line options
while getopts "chlL" flag
do
	case "$flag" in
		c) copy_for_synth; exit 0;;
		L) flag_L=1;;
		l) flag_l=1;;
		h) print_usage; exit 2;;
		?) print_usage; exit 2;;
	esac
done


# create syn scratch work directory
test -d syn/scratch && rm -rf syn/scratch
mkdir -p syn/scratch/src

# copy verilog code and IP into syn work dir
copy_for_synth

# create syn project for use in syn work dir
cd syn

# create build directories
if [ ! -z "$flag_L" ]; then
	# link directories
	for DIR in $(find project-* -maxdepth 0 -type d)
	do
		ln -s "${PWD}/$DIR" "scratch/$DIR"
	done
elif [ ! -z "$flag_l" ]; then
	# create directories but link files
	for DIR in $(find project-*/ -type d)
	do
		mkdir -p "scratch/$DIR"
	done

	# populate with links to files
	for FILE in $(find project-*/ -type f)
	do
		ln -s "${PWD}/$FILE" "scratch/$FILE"
	done
else
	# copy directories
	for DIR in $(find project-* -maxdepth 0 -type d)
	do
		cp -r "$DIR" "scratch/$DIR"
	done
fi