# ------------------
# Makefile for Fawks
# ------------------

# Run `make help` for information on available actions.

# --------------------
# Variable definitions
# --------------------

# Default name for Fawkss executable.
FAWKSS = $(CURDIR)/fawkss

# Diff executable to use, prefer `colordiff` if installed.
DIFF = $(shell which colordiff || which diff)
TMPPID = $(shell echo $$PPID)

# Test files to execute.
TESTS ?= $(shell find tests/*/*.scss)

# Color & style definitions.
BOLD      = \033[1m
UNDERLINE = \033[4m
RED       = \033[31m
GREEN     = \033[32m
BLUE      = \033[36m
RESET     = \033[0m

# ----------------
# Other directives
# ----------------

# Make `help` be the default action when no arguments are passed to `make`.
.DEFAULT_GOAL = help
.PHONY: $(TESTS) test help

# Awk script for extracting Fawkss documentation as Markdown.
define EXTRACT_MARKDOWN
	/^(#|# .*)$$/ {
		if (f==1) {f=0; printf "```\n\n"}
		print substr($$0, 3)
	}
	/^[^#]/ {
		if (f==0) {f=1; printf "\n```awk\n"}
		print
	}
	!NF {
		print
	}
	END {
		if (f==1) {printf "```\n"}
	}
endef
export EXTRACT_MARKDOWN

# ----------------
# Rule definitions
# ----------------

## Build documentation from source file in Markdown format.
doc:
	@awk "$$EXTRACT_MARKDOWN" "$(FAWKSS)"

## Execute test suite, accepts list of specific files to run.
test: test-before $(TESTS) test-after

test-before:
	@printf ">> $(BOLD)Executing tests...$(RESET)\n"

test-after:
	@printf ">> $(BOLD)Finished executing tests.$(RESET)\n"

$(TESTS):
    # Generate temporary test files from concatenated original.
	@awk "/--- TEST ---/ {f=1;next} /--- EXPECTED ---/ {exit} f" $@ >> $@.test.$(TMPPID)
	@awk "/--- EXPECTED ---/ {f=1;next} /--- END ---/ {exit} f" $@ >> $@.expected.$(TMPPID)

    # Calculate time and execute Fawkss with test file.
	$(eval ts = $(shell date +"%s%3N"))
	@$(FAWKSS) $@.test.$(TMPPID) > $@.actual.$(TMPPID)
	$(eval te = $(shell date +"%s%3N"))

	@printf ">> $(BOLD)Testing file '$@'...$(RESET) "

    # Generate diff between expected and actual results and print back to user.
	@result=$$($(DIFF) -ud $@.expected.$(TMPPID) $@.actual.$(TMPPID) | tail -n +3); \
	if [ -z "$$result" ]; then                                                      \
		time=`echo "$(ts) $(te)" | awk '{printf "(%.3fs)\n", (($$2-$$1)/1000)}'`;   \
		printf "$(GREEN)OK$(RESET) $$time\n";                                       \
	else                                                                            \
		printf "$(RED)FAIL$(RESET)\n";                                              \
		echo "$$result";                                                            \
	fi                                                                              \

    # Clean up temporary files.
	@rm -f $@.test.$(TMPPID) $@.expected.$(TMPPID) $@.actual.$(TMPPID)

## Show usage information for this Makefile.
help:
	@printf "$(BOLD)Fawkss — The [ig]noble CSS preprocessor.$(RESET)\n\n"
	@printf "This Makefile contains tasks for processing auxiliary actions, such as\n"
	@printf "generating documentation or running test cases against the test suite.\n\n"
	@printf "$(UNDERLINE)Available Tasks$(RESET)\n\n"
	@awk -F                                                                       \
		':|##' '/^##/ {c=$$2; getline; printf "$(BLUE)%6s$(RESET) %s\n", $$1, c}' \
		$(MAKEFILE_LIST)
	@printf "\n"