# sl0ppty — see DESIGN.md
#
# zig is the C compiler: it is already required to build libghostty-vt, and it
# gives us static musl linking and cross-compilation for free (D12).

ZIG      ?= $(HOME)/zig-0.16.0/zig
CC       := $(ZIG) cc
VT       := vendor/libghostty-vt
VT_OUT   := $(VT)/zig-out
VT_LIB   := $(VT_OUT)/lib/libghostty-vt.a
VT_INC   := $(VT_OUT)/include

# -MMD -MP emits a .d per object listing the headers it included, so editing a
# header rebuilds what actually uses it. Without this a header edit rebuilt
# nothing and the only safe move was `make clean`, which is how a 0.1s build
# turns into a habit of throwing the whole thing away.
# The version is baked in, because the first question when a session is
# behaving oddly is "which build is this?" -- and a session keeps the binary it
# started with, so the answer is not "whatever is in build/ now".
VERSION  := 0.1.0
GITDESC  := $(shell git describe --always --dirty 2>/dev/null || echo unknown)

CFLAGS   := -std=c23 -O1 -g -Wall -Wextra -Wno-unused-parameter -MMD -MP \
            -I$(VT_INC) -Isrc -Ibuild
LDFLAGS  :=

SRC      := $(wildcard src/*.c)
OBJ      := $(SRC:src/%.c=build/%.o)
DEPS     := $(OBJ:.o=.d)
BIN      := build/sl0ppty

# One stamp per python test file. The stamp depends on the file, the harness and
# the binary, so an untouched test whose binary has not changed does not run
# again — and `make -j` runs the rest at once, because they are separate
# processes that share nothing (script mode opens no socket).
# test_session.py drives a real pty and belongs to test-live; it is only named
# test_* by history.
PY_TESTS  := $(filter-out test_session.py,$(notdir $(wildcard tests/test_*.py)))
PY_STAMPS := $(PY_TESTS:%.py=build/.pass-%)
JOBS      ?= $(shell nproc 2>/dev/null || echo 4)

.PHONY: all clean vendor run test retest test-live test-all smoke help coverage
.DEFAULT_GOAL := help

help: ## show this
	@grep -hE '^[a-z-]+:.*##' $(MAKEFILE_LIST) | sed 's/:.*##/\t/' | expand -t20

all: $(BIN) ## build sl0ppty

$(BIN): $(OBJ) $(VT_LIB)
	$(CC) $(OBJ) $(VT_LIB) -o $@ $(LDFLAGS)

build/%.o: src/%.c build/version.h $(VT_LIB) | build
	$(CC) $(CFLAGS) -c $< -o $@

# stb_image comes with the vendored libghostty-vt, which is where the include
# path points. It is third-party and does not build clean under our warnings,
# so it gets its own rule rather than every file paying for it.
build/png.o: src/png.c build/version.h $(VT_LIB) | build
	$(CC) $(CFLAGS) -I$(VT)/src/stb -Wno-unused-function -c $< -o $@

# Rewritten only when the value actually changes, so `make` after a commit
# rebuilds, and `make` twice in a row does not.
.PHONY: FORCE
build/version.h: FORCE | build
	@printf '/* generated by the Makefile */\n#define SL0PPTY_VERSION "%s+%s"\n' \
	  '$(VERSION)' '$(GITDESC)' > $@.tmp
	@cmp -s $@.tmp $@ || mv $@.tmp $@
	@rm -f $@.tmp

build:
	@mkdir -p build

$(VT_LIB):
	@$(MAKE) vendor

vendor: ## build the vendored libghostty-vt (needs zig 0.16)
	cd $(VT) && PATH="$(dir $(ZIG)):$$PATH" zig build -Demit-lib-vt -Doptimize=ReleaseFast

TEST_BIN := build/input_test

$(TEST_BIN): tests/input_test.c src/input.c $(VT_LIB) | build
	$(CC) $(CFLAGS) tests/input_test.c src/input.c $(VT_LIB) -o $@

KDL_TEST := build/kdl_test

$(KDL_TEST): tests/kdl_test.c src/kdl.c | build
	$(CC) $(CFLAGS) tests/kdl_test.c src/kdl.c -o $@

EXPR_TEST := build/expr_test

$(EXPR_TEST): tests/expr_test.c src/expr.c | build
	$(CC) $(CFLAGS) tests/expr_test.c src/expr.c -o $@

# The real expression evaluator as a filter, so test_shadertoy.py can hold
# contrib/shadertoy.html's JavaScript to what the compiler actually does.
EXPR_EVAL := build/expr_eval

$(EXPR_EVAL): tests/expr_eval.c src/expr.c | build
	$(CC) $(CFLAGS) tests/expr_eval.c src/expr.c -o $@

SHADER_TEST := build/shader_test

$(SHADER_TEST): tests/shader_test.c src/shader.c src/screen.c src/json.c src/expr.c $(VT_LIB) | build
	$(CC) $(CFLAGS) tests/shader_test.c src/shader.c src/screen.c src/json.c src/expr.c $(VT_LIB) -o $@

# Shader plugins, for test_shader_plugin.py: a good one, one that announces an
# ABI we do not speak, and the example we ship in contrib -- which is built
# here so that a broken example is a failing test rather than a bug report.
PLUGIN_CFLAGS := -std=c23 -O1 -fPIC -shared -Isrc

build/testshader.so: tests/shader_plugin_test.c src/shader_abi.h | build
	$(CC) $(PLUGIN_CFLAGS) $< -o $@

build/badshader.so: tests/shader_plugin_test.c src/shader_abi.h | build
	$(CC) $(PLUGIN_CFLAGS) -DBAD_ABI $< -o $@

build/exampleshader.so: contrib/shader-plugin/example.c src/shader_abi.h | build
	$(CC) $(PLUGIN_CFLAGS) $< -o $@

build/.pass-test_shader_plugin: build/testshader.so build/badshader.so \
                                build/exampleshader.so

build/.pass-test_shadertoy: $(EXPR_EVAL) contrib/shadertoy.html

build/.pass-%: tests/%.py tests/harness.py $(BIN) | build
	@cd tests && timeout 300 python3 $(notdir $<) > ../build/.log-$* 2>&1 \
	  || { echo "FAIL $(notdir $<)"; tail -25 ../build/.log-$*; exit 1; }
	@printf '  ok   %-24s %s\n' "$(notdir $<)" "$$(grep -c '^ok' build/.log-$* 2>/dev/null || echo ?) checks"
	@touch $@

test: $(BIN) $(TEST_BIN) $(KDL_TEST) $(SHADER_TEST) $(EXPR_TEST) $(EXPR_EVAL) ## unit + headless checks (fast)
	@./$(TEST_BIN) >/dev/null && ./$(KDL_TEST) >/dev/null && ./$(SHADER_TEST) >/dev/null \
	  && ./$(EXPR_TEST) >/dev/null \
	  && printf '  ok   %-24s %s\n' "C unit tests" "4 binaries"
	@$(MAKE) --no-print-directory -j$(JOBS) $(PY_STAMPS)
	@printf '\nall green\n'

retest: ## force every python test to run again
	@rm -f build/.pass-*
	@$(MAKE) --no-print-directory test

test-live: $(BIN) ## the checks that need a real tty (slow)
	python3 tests/live_m0.py
	@echo
	python3 tests/live_input.py
	@echo
	python3 tests/test_session.py
	@echo
	python3 tests/live_reload.py

test-all: test test-live ## everything

smoke: $(BIN) ## compose a screen headlessly and print it
	./$(BIN) --headless --cols 40 --rows 12 -- /bin/sh -c 'printf "hello \033[1;32msl0ppty\033[0m\n"; echo "wide: 日本語"'

run: $(BIN) ## build and run
	./$(BIN)

# ── coverage ────────────────────────────────────────────────────────────────
#
# A second build, with gcc instead of zig, because the counters need a gcov
# that matches the compiler and gcov is what this machine has. It lives in
# build/cov and touches nothing else; $SL0PPTY_BIN is how the same suite drives
# it. `-O0` because optimised line counts are a work of fiction.
COV_DIR  := build/cov
COV_SRC  := $(wildcard src/*.c)
COV_OBJ  := $(COV_SRC:src/%.c=$(COV_DIR)/%.o)
COV_CC   ?= gcc
COV_FLAGS := -std=c23 -O0 -g --coverage -I$(VT_INC) -Isrc -Ibuild

$(COV_DIR)/%.o: src/%.c build/version.h | $(COV_DIR)
	@$(COV_CC) $(COV_FLAGS) -c $< -o $@

$(COV_DIR):
	@mkdir -p $(COV_DIR)

$(COV_DIR)/sl0ppty: $(COV_OBJ) $(VT_LIB)
	@$(COV_CC) --coverage $(COV_OBJ) $(VT_LIB) -o $@

# The C unit tests link the *same* coverage objects, so their counters land in
# the same place and input.c/kdl.c/shader.c/expr.c are credited for the tests
# that actually exercise them. Without this they read as half-tested, which is
# a lie about where the tests are.
COV_UNITS := $(COV_DIR)/input_test $(COV_DIR)/kdl_test $(COV_DIR)/shader_test \
             $(COV_DIR)/expr_test

$(COV_DIR)/input_test: tests/input_test.c $(COV_DIR)/input.o $(VT_LIB)
	@$(COV_CC) $(COV_FLAGS) $^ -o $@
$(COV_DIR)/kdl_test: tests/kdl_test.c $(COV_DIR)/kdl.o
	@$(COV_CC) $(COV_FLAGS) $^ -o $@
$(COV_DIR)/shader_test: tests/shader_test.c $(COV_DIR)/shader.o $(COV_DIR)/screen.o \
                        $(COV_DIR)/json.o $(COV_DIR)/expr.o $(VT_LIB)
	@$(COV_CC) $(COV_FLAGS) $^ -o $@
$(COV_DIR)/expr_test: tests/expr_test.c $(COV_DIR)/expr.o
	@$(COV_CC) $(COV_FLAGS) $^ -o $@

coverage: $(COV_DIR)/sl0ppty $(COV_UNITS) ## how much of the code the tests run
	@rm -f $(COV_DIR)/*.gcda
	@for u in $(COV_UNITS); do ./$$u >/dev/null || echo "  (failed: $$u)"; done
	@echo "running the suite against the coverage build..."
	@for t in $(PY_TESTS); do \
	  (cd tests && SL0PPTY_BIN=../$(COV_DIR)/sl0ppty timeout 300 python3 $$t >/dev/null 2>&1) \
	    || echo "  (failed: $$t)"; \
	done
	@for t in test_session.py live_m0.py live_input.py live_reload.py; do \
	  (cd tests && SL0PPTY_BIN=../$(COV_DIR)/sl0ppty timeout 300 python3 $$t >/dev/null 2>&1) \
	    || echo "  (failed: $$t)"; \
	done
	@contrib/coverage

clean: ## remove our build output (not the vendor lib)
	rm -rf build

-include $(DEPS)