# spec.sr.ht — build scaffolding (compare.sr.ht / sourcehut-dolt style).
#
# One Go binary plus a brant migration wrapper, both under cmd/. The CSS is
# built from the shared sourcehut scss partials with sassc; there is no
# frontend bundle — the prose differ renders server-side.

SERVICE=spec.sr.ht
BIN=specsrht
MIGRATE_BIN=specsrht-migrate

PREFIX?=/usr/local
BINDIR?=$(PREFIX)/bin
# ASSETS is the RUNTIME lookup root: specsrht-migrate resolves migrations and
# the schema under [sr.ht]assets (default /usr/share/sourcehut), NOT under
# PREFIX. Deriving these from PREFIX instead would install to
# /usr/local/share/... on a default build while the binary kept looking in
# /usr/share/sourcehut — the two would only agree at PREFIX=/usr. Keep every
# installed data path anchored to ASSETS so a default `make install` works.
ASSETS?=/usr/share/sourcehut
MIGRATIONDIR?=$(ASSETS)/migrations/$(SERVICE)
SCHEMAFILE?=$(ASSETS)/$(SERVICE).sql

# INSTALL is a variable because the `install -D` of `install-files` below —
# create the leading directories, then copy — is GNU coreutils, which is what
# the Alpine builders of this family have and what the sibling Makefiles
# assume. BSD install has no -D and fails on the first missing directory, so on
# a machine with the GNU tools under their g-prefix,
# `make INSTALL=ginstall install-files` is the same command.
INSTALL?=install

SASSC?=sassc
SASSC_INCLUDE=-I$(ASSETS)/scss

# The one stylesheet the binary embeds. The hash in the name is the
# cache-busting version — web/ globs for it and serves it — which is why the
# glob has to match exactly one file, and why check-css counts rather than asks.
CSS=web/static/main.min.*.css

all: build

# Compile the binaries. Both targets are .PHONY: Go decides staleness itself,
# and a real file target would never rebuild after a source edit. The cost is
# that anything depending on them recompiles — which is why `install` is split
# in two below.
#
# The `[ -d ./cmd/... ]` guards these targets carried during the build-out are
# gone. They were written so a tree without cmd/ would not fail its default
# target; what they buy now is a `make build` that prints "skip" and exits 0
# with no binary, so a deleted or renamed cmd/ directory reads as a green build
# that packages nothing. A missing package is a `go build` error naming it.
build: $(BIN) $(MIGRATE_BIN)

$(BIN):
	go build -o $@ ./cmd/$(BIN)

$(MIGRATE_BIN):
	go build -o $@ ./cmd/$(MIGRATE_BIN)

test:
	go test ./...

# CSS pipeline: sassc -> minify -> content-hashed filename. The running service
# globs web/static/main.min.*.css at startup, so the hash in the name is the
# cache-busting version. Requires the shared scss partials installed at
# $(ASSETS)/scss (core.sr.ht `make install`) and scss/main.scss to exist.
# Produces exactly ONE web/static/main.min.<sha256[:8]>.css; old ones and the
# intermediate main.css are removed.
css:
	mkdir -p web/static
	rm -f web/static/main.css web/static/main.min.*.css
	$(SASSC) $(SASSC_INCLUDE) scss/main.scss web/static/main.css
	minify -o web/static/main.min.css web/static/main.css
	mv web/static/main.min.css \
		web/static/main.min.$$(sha256sum web/static/main.min.css | cut -c1-8).css
	rm -f web/static/main.css

# Local development run. Requires a ./config.ini in the working directory (or
# ../config.ini, /etc/sr.ht/config.ini) carrying the instance's shared
# [sr.ht]/[webhooks] keys plus a [spec.sr.ht] section.
run-dev: build
	./$(BIN) -b localhost:5091

# schema.sql is installed as $(SCHEMAFILE) because `specsrht-migrate init`
# applies it wholesale on a fresh database; without it, init works from a
# checkout and fails on a packaged install.
#
# Static assets are not installed at all any more. web/templates.go go:embed-s
# the whole static directory, so those files are already inside the binary and a
# second copy under $(ASSETS)/$(SERVICE)/static is dead weight in the apk that
# nothing reads — the config has no static-dir key to point at it. It is also
# why check-css guards this target: an unstyled binary cannot be repaired by
# copying a stylesheet next to it afterwards.
install: check-css build
	@$(MAKE) install-files

# The copying half of `install`, with nothing to build in front of it — the
# target a packaging run calls once it has already built the binaries, so that
# the files it stages are the very bytes it built and not a second compilation
# of the same sources.
#
# That distinction is the whole point and it is not theoretical. $(BIN) above is
# .PHONY, so `install` recompiles; abuild runs package() in a FRESH abuild
# process under fakeroot, which re-sources the APKBUILD and never calls
# build(). Nothing build() exported reaches package(), the CI cache pins among
# it, so `make install` there relinked both binaries from a cold cache — a
# second binary, shipped, that nothing in the pipeline had tested.
#
# It is invoked through a sub-make rather than listed as a third prerequisite of
# `install` on purpose: /usr/share/abuild/default.conf exports
# MAKEFLAGS=-j$(nproc), prerequisites of one target run in parallel under -j,
# and `install: check-css build install-files` would let the copying start
# beside the build it is supposed to follow. A recipe line always runs after the
# prerequisites are done.
#
# There is no check in front of the copies: `install -Dm755 specsrht` on a
# missing file is already a fatal error naming it, which is the right report for
# the one way this target can be called too early.
install-files:
	$(INSTALL) -Dm755 $(BIN) $(DESTDIR)$(BINDIR)/$(BIN)
	$(INSTALL) -Dm755 $(MIGRATE_BIN) $(DESTDIR)$(BINDIR)/$(MIGRATE_BIN)
	mkdir -p $(DESTDIR)$(MIGRATIONDIR)
	$(INSTALL) -Dm644 -t $(DESTDIR)$(MIGRATIONDIR) migrations/*.sql
	$(INSTALL) -Dm644 schema.sql $(DESTDIR)$(SCHEMAFILE)

# check-css is the packaging gate: no stylesheet, no release. It exists because
# the failure it catches is invisible at build time — `go build` succeeds
# perfectly well with an unstyled static/, since //go:embed takes the directory
# and not the file, and the first sign of trouble is an unstyled page in
# production.
#
# It counts the matches rather than merely asking whether there are any, because
# TWO stylesheets are as wrong as none and quieter: web/ resolves this glob and
# takes the first match, so a second file makes the served stylesheet depend on
# readdir order. `css` removes the previous build for that reason, which is
# exactly why this gate must not assume it did.
#
# `set --` puts the matches in the positional parameters, so the count is $$#
# and no `wc` output has to be parsed. Splitting on whitespace is fine: every
# name it can see was produced by the recipe above, out of a hex digest.
check-css:
	@set -- $$(ls $(CSS) 2>/dev/null); \
	if [ $$# -eq 0 ]; then \
		echo "error: no $(CSS) — run 'make css' before 'go build' (the CSS is embedded)"; \
		exit 1; \
	elif [ $$# -gt 1 ]; then \
		echo "error: $$# files match $(CSS) — web/ takes the first, so the choice is arbitrary."; \
		echo "       run 'make clean && make css' to get back to one:"; \
		for f in "$$@"; do echo "         $$f"; done; \
		exit 1; \
	fi

clean:
	rm -f $(BIN) $(MIGRATE_BIN)
	rm -f web/static/main.css web/static/main.min.*.css

.PHONY: all build test css run-dev install install-files check-css clean \
	$(BIN) $(MIGRATE_BIN)