# examples/lisp — tiny Lisp interpreter, built with the ww toolchain.
# No FFI: the program lives entirely on lib/* and libwwrt.a.
#
# Layout
#   lisp.ww         entry point. `use lispcore;` + `main()` = repl().
#   lispcore.ww     interpreter module. Types/functions are `export`-ed
#                   so both lisp.ww and lisp_test.ww consume them via
#                   the same `use lispcore;`.
#   lisp_test.ww    in-process test driver, executed by `make test`
#                   (which invokes `ww test`).
#
# `ww`'s module resolver uses the *directory's basename* as the module
# name when finding `lispcore.ww` through `-I <dir>`. Passing the
# absolute path of the current directory keeps that name stable
# (otherwise `-I.` collapses to ".", and the cgen mangles symbols as
# `..helper`, which then breaks the assembler).

# Drive the wwstage cgen (w6c_ww) by default. The C-stage cgen has
# unfixed silent-miscompilation traps that lispcore used to dodge by
# hand; with the wwstage fixes in place we can write the natural
# shape (no flattened sub-structs, no aliased global indexers, no
# `let p = xs[i];` per builtin) and lisp_test still passes.
WW     := $(shell cd ../..; pwd)/out/bin/ww
W6CWW  := $(shell cd ../..; pwd)/out/bin/w6c_ww
HERE   := $(shell pwd)
WWENV  := WW_W6C=$(W6CWW)

lisp: lisp.ww lispcore.ww
	$(WWENV) $(WW) build lisp.ww -I $(HERE)

# `ww test <file.ww>` in single-file mode discards extra args, so we
# can't pass `-I` through it. Build the test as a normal binary and
# exec it directly — exit 0 means all probes passed.
test: lisp_test lisp
	./lisp_test

lisp_test: lisp_test.ww lispcore.ww
	$(WWENV) $(WW) build lisp_test.ww -I $(HERE)

# Demo programs in tree. `make demo` runs every test_*.lisp through
# the REPL; each prints its results to stdout (errors go to stderr
# and don't break the run). Useful as a smoke check after edits.
DEMOS := test_arith.lisp test_list.lisp test_lambda.lisp test_error.lisp test_tco.lisp

demo: lisp
	@for f in $(DEMOS); do \
		echo "==> $$f"; \
		./lisp < $$f; \
	done

clean:
	rm -f lisp lisp.o lisp.s lisp.combined.ww \
	      lisp_test lisp_test.o lisp_test.s lisp_test.combined.ww

.PHONY: clean test demo