PORT := 1234
CHECK := diff -q
MKDIR_P := mkdir -p
ECHO := echo -e
NC := \033[0m
RED := \033[0;31m
GREEN := \033[0;32m
YELLOW := \033[1;33m

CC := lcc
CFLAGS := -nostdlib

QEMU := qemu-e2k
QEMU_ARGS := 

GDB ?= e2k-linux-gdb
GDB_ARGS := -q --batch --nx --nw -ix gdbinit
GDB_BPS := -ex 'b _start' -ex 'b _stop'

ifndef EMU
	GDB_SERVER := gdbserver
	GDB_SERVER_ARGS := :$(PORT)
else
	GDB_SERVER := $(QEMU)
	GDB_SERVER_ARGS := -g $(PORT) $(QEMU_ARGS)
endif

tests := $(subst .s,,$(notdir $(wildcard src/*.s)))
executables := $(addprefix build/,$(tests))
logs := $(addprefix build/,$(addsuffix .log,$(tests)))
checks := $(addprefix check-,$(tests))

.PHONY: all build logs test gen-test mkdirs clean clean-logs $(checks)

all: logs

build: mkdirs $(executables)

logs: mkdirs $(logs)

gen-test: clean-logs logs test

test: mkdirs $(checks)

mkdirs:
	@$(MKDIR_P) build

clean: clean-logs
	@$(RM) $(executables)

clean-logs:
	@$(RM) $(logs)

$(executables): build/%: src/%.s
	@$(ECHO) "  $(GREEN)build $(NC)$*"
	@$(CC) $(CFLAGS) -o $@ $<

$(logs): build/%.log: build/% src/%.gdb
	@$(ECHO) "    $(GREEN)gen $(NC)$*.log"
	@$(GDB_SERVER) $(GDB_SERVER_ARGS) $< &> /dev/null &
	@$(GDB) $(GDB_ARGS) -ex 'file $<' $(GDB_BPS) \
		-ex 'target remote :$(PORT)' -x src/$*.gdb > $@

.ONESHELL:
$(checks): check-%: build/%.log src/%.log
	@$(ECHO) -n "  $(GREEN)check $(NC)$*"
	$(CHECK) $^ &> /dev/null
	if [ $$? -eq 0 ]
	then
		$(ECHO) " $(GREEN)OK!$(NC)"
		true
	else
		$(ECHO) " $(RED)FAIL!$(NC)"
		false
	fi