Split rules.

examples/wasm/Makefile

@@ -2,57 +2,71 @@ EXAMPLES := exponential_map gliding_clamp constellation_clamp egui
 
 .PHONY: help
 help:
-	@printf "make install  Installs required tools.\n"
-	@printf "make wasm -j  Builds optimized WASM examples.\n"
-	@printf "make serve    Runs local HTTP server.\n"
-	@printf "make clean    Removes ./target directory.\n"
+	@printf "make [help]     Prints this help.\n"
+	@printf "make install    Installs required tools except rustup and cargo.\n"
+	@printf "make wasm [-j]  Builds optimized WASM examples.\n"
+	@printf "make html [-j]  Generates HTML for examples.\n"
+	@printf "make host [-j]  Runs local HTTP server (host: wasm html).\n"
+	@printf "make clean      Removes ./target directory.\n"
 
 .PHONY: install
 install:
-	command -v apt && sudo apt install binaryen || true
-	command -v dnf && sudo dnf install binaryen || true
-	command -v yum && sudo yum install binaryen || true
-	command -v pacman && sudo pacman -S --needed binaryen || true
+	command -v apt && sudo apt install binaryen jq || true
+	command -v dnf && sudo dnf install binaryen jq || true
+	command -v yum && sudo yum install binaryen jq || true
+	command -v pacman && sudo pacman -S --needed binaryen jq || true
 	rustup target add wasm32-unknown-unknown
 	cargo install wasm-bindgen-cli basic-http-server
 
 .PHONY: wasm
 wasm: $(EXAMPLES:%=target/%.wasm)
+.PHONY: html
+html: $(EXAMPLES:%=target/%.html) target/index.html
 
 target:
-	mkdir -p target
-	ln -sf $(word 1,$(EXAMPLES)).html target/index.html
+	mkdir target
+
+.PHONY: update
+udpate:;
+
+target/metadata: ../../Cargo.toml | target
+	cargo metadata --no-deps --format-version 1 > $@
 
-.PHONY: build
-build: | target
-	@for example in $(EXAMPLES); do \
-		printf "    \033[1;32mChecking\033[0m $$example(example)\n"; \
-		features=$$(cargo metadata --no-deps --format-version 1 | \
-			jq --raw-output ".packages[] | select(.name==\"bevy_trackball\") | .targets[] | \
-				select(.name==\"$$example\") | .\"required-features\" | join(\",\")"); \
-		cargo build --profile wasm-release --target wasm32-unknown-unknown \
-			--features $${features:-,} --example $$example; \
-		jq -Rr @html ../../examples/$$example.rs > target/$$example.code; \
-		sed -e 's/{EXAMPLE}/'$$example'/g' -e '/{SOURCE}/{r target/'$$example.code -e 'd}' \
-			example.html > target/$$example.html; \
-	done
-
-../../target/wasm32-unknown-unknown/wasm-release/examples/%.wasm: build
-	@true
+target/%.features: target/metadata
+	cat $< | jq -r ".packages[] | select(.name==\"bevy_trackball\") | .targets[] | \
+	select(.name==\"$*\") | .\"required-features\" | join(\",\")" > $@
+
+../../target/wasm32-unknown-unknown/wasm-release/examples/%.wasm: target/%.features update
+	@printf "    \033[1;32mUpdating\033[0m $*(example)\n"
+	cargo build --profile wasm-release --target wasm32-unknown-unknown -F $$(cat $<), --example $*
 
 target/%_bg.wasm: ../../target/wasm32-unknown-unknown/wasm-release/examples/%.wasm
-	@printf "     \033[1;32mBinding\033[0m $*(example)\n"; \
+	@printf "     \033[1;32mBinding\033[0m $*(example)\n"
 	wasm-bindgen --target web --out-dir target --out-name $* $<
 
 target/%.wasm: target/%_bg.wasm
-	@printf "  \033[1;32mOptimizing\033[0m $*(example)\n"; \
+	@printf "  \033[1;32mOptimizing\033[0m $*(example)\n"
 	mv $< $@
 	wasm-opt -Oz --output $< $@
 	touch $@
 
-.PHONY: serve
-serve: wasm
-	@printf "     \033[1;32mServing\033[0m examples\n"; \
+target/index.html:
+	ln -sf $(word 1,$(EXAMPLES)).html target/index.html
+
+target/input.code: ../../src/lib.rs | target
+	sed -n '/| Keyboard |/,/| `Return` |/p' $< | jq -Rr @html > $@
+
+target/%.code: ../%.rs target/input.code
+	cat target/input.code > $@
+	printf '%s\n' '//!' >> $@
+	jq -Rr @html $< >> $@
+
+target/%.html: target/%.code example.html
+	sed -e 's/{EXAMPLE}/'$*'/g' -e '/{SOURCE}/{r '$< -e 'd}' example.html > $@
+
+.PHONY: host
+host: wasm html
+	@printf "     \033[1;32mServing\033[0m examples\n"
 	basic-http-server target
 
 .PHONY: clean