tools: don't lint files that have not changed

PR-URL: #16581
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>

Makefile

@@ -974,6 +974,7 @@ bench-ci: bench
 lint-md-clean:
  $(RM) -r tools/remark-cli/node_modules
  $(RM) -r tools/remark-preset-lint-node/node_modules
+ $(RM) tools/.*mdlintstamp
 
 lint-md-build:
  @if [ ! -d tools/remark-cli/node_modules ]; then \
@@ -983,10 +984,25 @@ lint-md-build:
  echo "Markdown linter: installing remark-preset-lint-node into tools/"; \
  cd tools/remark-preset-lint-node && ../../$(NODE) ../../$(NPM) install; fi
 
-lint-md: lint-md-build
- @echo "Running Markdown linter..."
- $(NODE) tools/remark-cli/cli.js -q -f \
- ./*.md doc src lib benchmark tools/doc/ tools/icu/
+LINT_MD_TARGETS = src lib benchmark tools/doc tools/icu
+LINT_MD_ROOT_DOCS := $(wildcard *.md)
+LINT_MD_FILES := $(shell find $(LINT_MD_TARGETS) -type f \
+ -not -path '*node_modules*' -name '*.md') $(LINT_MD_ROOT_DOCS)
+LINT_DOC_MD_FILES = $(shell ls doc/**/*.md)
+
+tools/.docmdlintstamp: $(LINT_DOC_MD_FILES)
+ @echo "Running Markdown linter on docs..."
+ @$(NODE) tools/remark-cli/cli.js -q -f $(LINT_DOC_MD_FILES)
+ @touch $@
+
+tools/.miscmdlintstamp: $(LINT_MD_FILES)
+ @echo "Running Markdown linter on misc docs..."
+ @$(NODE) tools/remark-cli/cli.js -q -f $(LINT_MD_FILES)
+ @touch $@
+
+tools/.mdlintstamp: tools/.miscmdlintstamp tools/.docmdlintstamp
+
+lint-md: | lint-md-build tools/.mdlintstamp
 
 LINT_JS_TARGETS = benchmark doc lib test tools
 LINT_JS_CMD = tools/eslint/bin/eslint.js --cache \
@@ -1048,10 +1064,13 @@ LINT_CPP_FILES = $(filter-out $(LINT_CPP_EXCLUDE), $(wildcard \
 # 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:
+lint-cpp: tools/.cpplintstamp
+
+tools/.cpplintstamp: $(LINT_CPP_FILES)
  @echo "Running C++ linter..."
- @$(PYTHON) tools/cpplint.py $(LINT_CPP_FILES)
+ @$(PYTHON) tools/cpplint.py $?
  @$(PYTHON) tools/check-imports.py
+ @touch $@
 
 lint-addon-docs: test/addons/.docbuildstamp
  @echo "Running C++ linter on addon docs..."
@@ -1087,6 +1106,10 @@ lint:
 lint-ci: lint
 endif
 
+lint-clean:
+ $(RM) tools/.*lintstamp
+ $(RM) .eslintcache
+
 .PHONY: $(TARBALL)-headers \
  all \
  bench \
@@ -1127,6 +1150,7 @@ endif
  install-bin \
  install-includes \
  lint \
+ lint-clean \
  lint-ci \
  lint-cpp \
  lint-js \