build: make test-doc and lint addon docs

- Implements the make test-doc target that build, verify
  and lint docs
- Lint the C++ snippets in addon docs
- When generating addons and running the JS linter,
  use the global node executable if it is not built.
  Therefore one does not have to build node in order to
  run make test-doc.

Author: joyeecheung

Makefile

@@ -219,7 +219,8 @@ test: all
 		$(CI_ASYNC_HOOKS) \
 		$(CI_JS_SUITES) \
 		$(CI_NATIVE_SUITES) \
-		doctool known_issues
+		$(CI_DOC) \
+		known_issues
 endif
 
 # For a quick test, does not run linter or build doc
@@ -268,7 +269,6 @@ test/gc/build/Release/binding.node: test/gc/binding.cc test/gc/binding.gyp
 		--directory="$(shell pwd)/test/gc" \
 		--nodedir="$(shell pwd)"
 
-# Implicitly depends on $(NODE_EXE), see the build-addons rule for rationale.
 DOCBUILDSTAMP_PREREQS = tools/doc/addon-verify.js doc/api/addons.md
 
 ifeq ($(OSTYPE),aix)
@@ -277,7 +277,7 @@ endif
 
 test/addons/.docbuildstamp: $(DOCBUILDSTAMP_PREREQS)
 	$(RM) -r test/addons/??_*/
-	$(NODE) $<
+	[ -x $(NODE) ] && $(NODE) $< || node $<
 	touch $@
 
 ADDONS_BINDING_GYPS := \
@@ -312,10 +312,10 @@ test/addons/.buildstamp: config.gypi \
 	done
 	touch $@
 
-# .buildstamp and .docbuildstamp need $(NODE_EXE) but cannot depend on it
+# .buildstamp needs $(NODE_EXE) but cannot depend on it
 # directly because it calls make recursively.  The parent make cannot know
 # if the subprocess touched anything so it pessimistically assumes that
-# .buildstamp and .docbuildstamp are out of date and need a rebuild.
+# .buildstamp is out of date and need a rebuild.
 # Just goes to show that recursive make really is harmful...
 # TODO(bnoordhuis) Force rebuild after gyp update.
 build-addons: $(NODE_EXE) test/addons/.buildstamp
@@ -347,10 +347,10 @@ test/addons-napi/.buildstamp: config.gypi \
 	done
 	touch $@
 
-# .buildstamp and .docbuildstamp need $(NODE_EXE) but cannot depend on it
+# .buildstamp needs $(NODE_EXE) but cannot depend on it
 # directly because it calls make recursively.  The parent make cannot know
 # if the subprocess touched anything so it pessimistically assumes that
-# .buildstamp and .docbuildstamp are out of date and need a rebuild.
+# .buildstamp is out of date and need a rebuild.
 # Just goes to show that recursive make really is harmful...
 # TODO(bnoordhuis) Force rebuild after gyp or node-gyp update.
 build-addons-napi: $(NODE_EXE) test/addons-napi/.buildstamp
@@ -382,6 +382,7 @@ test-all-valgrind: test-build
 CI_NATIVE_SUITES ?= addons addons-napi
 CI_ASYNC_HOOKS := async-hooks
 CI_JS_SUITES ?= default
+CI_DOC := doctool
 
 # Build and test addons without building anything else
 test-ci-native: LOGLEVEL := info
@@ -407,7 +408,8 @@ test-ci: | clear-stalled build-addons build-addons-napi doc-only
 	out/Release/cctest --gtest_output=tap:cctest.tap
 	$(PYTHON) tools/test.py $(PARALLEL_ARGS) -p tap --logfile test.tap \
 		--mode=release --flaky-tests=$(FLAKY_TESTS) \
-		$(TEST_CI_ARGS) $(CI_ASYNC_HOOKS) $(CI_JS_SUITES) $(CI_NATIVE_SUITES) doctool known_issues
+		$(TEST_CI_ARGS) $(CI_ASYNC_HOOKS) $(CI_JS_SUITES) $(CI_NATIVE_SUITES) \
+		$(CI_DOC) known_issues
 	# Clean up any leftover processes, error if found.
 	ps awwx | grep Release/node | grep -v grep | cat
 	@PS_OUT=`ps awwx | grep Release/node | grep -v grep | awk '{print $$1}'`; \
@@ -443,6 +445,10 @@ test-tick-processor: all
 test-hash-seed: all
 	$(NODE) test/pummel/test-hash-seed.js
 
+test-doc: doc-only
+	$(MAKE) lint
+	$(PYTHON) tools/test.py $(CI_DOC)
+
 test-known-issues: all
 	$(PYTHON) tools/test.py known_issues
 
@@ -976,26 +982,38 @@ lint-md: lint-md-build
 		./*.md doc src lib benchmark tools/doc/ tools/icu/
 
 LINT_JS_TARGETS = benchmark doc lib test tools
+LINT_JS_CMD = tools/eslint/bin/eslint.js --cache \
+	--rulesdir=tools/eslint-rules --ext=.js,.mjs,.md \
+	$(LINT_JS_TARGETS)
 
 lint-js:
 	@echo "Running JS linter..."
-	$(NODE) tools/eslint/bin/eslint.js --cache --rulesdir=tools/eslint-rules --ext=.js,.mjs,.md \
-	  $(LINT_JS_TARGETS)
+	@if [ -x $(NODE) ]; then \
+		$(NODE) $(LINT_JS_CMD); \
+	else \
+		node $(LINT_JS_CMD); \
+	fi
 
 jslint: lint-js
 	@echo "Please use lint-js instead of jslint"
 
 lint-js-ci:
 	@echo "Running JS linter..."
-	$(NODE) tools/lint-js.js $(PARALLEL_ARGS) -f tap -o test-eslint.tap \
-		$(LINT_JS_TARGETS)
+	@if [ -x $(NODE) ]; then \
+		$(NODE) tools/lint-js.js $(PARALLEL_ARGS) -f tap -o test-eslint.tap \
+		$(LINT_JS_TARGETS); \
+	else \
+		node tools/lint-js.js $(PARALLEL_ARGS) -f tap -o test-eslint.tap \
+		$(LINT_JS_TARGETS); \
+	fi
 
 jslint-ci: lint-js-ci
 	@echo "Please use lint-js-ci instead of jslint-ci"
 
+LINT_CPP_ADDON_DOC_FILES = $(wildcard test/addons/??_*/*.cc test/addons/??_*/*.h)
 LINT_CPP_EXCLUDE ?=
 LINT_CPP_EXCLUDE += src/node_root_certs.h
-LINT_CPP_EXCLUDE += $(wildcard test/addons/??_*/*.cc test/addons/??_*/*.h)
+LINT_CPP_EXCLUDE += $(LINT_CPP_ADDON_DOC_FILES)
 LINT_CPP_EXCLUDE += $(wildcard test/addons-napi/??_*/*.cc test/addons-napi/??_*/*.h)
 # These files were copied more or less verbatim from V8.
 LINT_CPP_EXCLUDE += src/tracing/trace_event.h src/tracing/trace_event_common.h
@@ -1019,11 +1037,19 @@ LINT_CPP_FILES = $(filter-out $(LINT_CPP_EXCLUDE), $(wildcard \
 	tools/icu/*.h \
 	))
 
+# Code blocks don't have newline at the end,
+# and the actual filename is generated so it won't match header guards
+ADDON_DOC_LINT_FLAGS=-whitespace/ending_newline,-build/header_guard
+
 lint-cpp:
 	@echo "Running C++ linter..."
 	@$(PYTHON) tools/cpplint.py $(LINT_CPP_FILES)
 	@$(PYTHON) tools/check-imports.py
 
+lint-addon-docs: test/addons/.docbuildstamp
+	@echo "Running C++ linter on addon docs..."
+	@$(PYTHON) tools/cpplint.py --filter=$(ADDON_DOC_LINT_FLAGS) $(LINT_CPP_ADDON_DOC_FILES)
+
 cpplint: lint-cpp
 	@echo "Please use lint-cpp instead of cpplint"
 
@@ -1033,9 +1059,10 @@ lint:
 	$(MAKE) lint-js || EXIT_STATUS=$$? ; \
 	$(MAKE) lint-cpp || EXIT_STATUS=$$? ; \
 	$(MAKE) lint-md || EXIT_STATUS=$$? ; \
+	$(MAKE) lint-addon-docs || EXIT_STATUS=$$? ; \
 	exit $$EXIT_STATUS
 CONFLICT_RE=^>>>>>>> [0-9A-Fa-f]+|^<<<<<<< [A-Za-z]+
-lint-ci: lint-js-ci lint-cpp lint-md
+lint-ci: lint-js-ci lint-cpp lint-md lint-addon-docs
 	@if ! ( grep -IEqrs "$(CONFLICT_RE)" benchmark deps doc lib src test tools ) \
 		&& ! ( find . -maxdepth 1 -type f | xargs grep -IEqs "$(CONFLICT_RE)" ); then \
 		exit 0 ; \
@@ -1115,6 +1142,7 @@ endif
   test-ci \
   test-ci-js \
   test-ci-native \
+	test-doc \
   test-gc \
   test-gc-clean \
   test-hash-seed \

doc/api/addons.md

@@ -1095,7 +1095,7 @@ static void at_exit_cb1(void* arg) {
   Isolate* isolate = static_cast<Isolate*>(arg);
   HandleScope scope(isolate);
   Local<Object> obj = Object::New(isolate);
-  assert(!obj.IsEmpty()); // assert VM is still alive
+  assert(!obj.IsEmpty());  // assert VM is still alive
   assert(obj->IsObject());
   at_exit_cb1_called++;
 }