[make] allow updating new website version

Summary:
`make new-website-version` would fail if run a second time, because it
assumes the version is brand new. Now, it will delete previous traces of
the new version, which allows one to easily update commits upgrading the
website instead of reverting the diff then running `make
new-website-version` again.

Reviewed By: martintrojer

Differential Revision: D24218463

fbshipit-source-id: 61f416677

Makefile

@@ -910,7 +910,7 @@ ifeq ($(IS_FACEBOOK_TREE),yes)
 	$(MAKE) -C facebook clean)
 endif
 	$(QUIET)$(call silent_on_success,Building infer and manuals,\
-	$(MAKE) $(INFER_GROFF_MANUALS))
+	$(MAKE) IS_FACEBOOK_TREE=no $(INFER_GROFF_MANUALS))
 	$(QUIET)$(MKDIR_P) "$(WEBSITE_DIR)"/static/man/next "$(WEBSITE_DIR)"/static/odoc/next
 	$(QUIET)$(call silent_on_success,Copying man pages,\
 	$(REMOVE) "$(WEBSITE_DIR)"/static/man/*; \
@@ -922,19 +922,25 @@ endif
 	$(QUIET)$(call silent_on_success,Copying OCaml modules documentation,\
 	rsync -a --delete $(BUILD_DIR)/default/_doc/_html/ "$(WEBSITE_DIR)"/static/odoc/next/)
 	$(QUIET)$(call silent_on_success,Building infer,\
-	$(MAKE) src_build)
+	$(MAKE) IS_FACEBOOK_TREE=no src_build)
 	$(QUIET)$(call silent_on_success,Calling 'infer help --write-website',\
 	$(INFER_BIN) help --write-website "$(WEBSITE_DIR)")
 
 .PHONY: new-website-version
+# note: deletes already-created new version if already there to make it easier to update new
+# versions while preparing a release
 new-website-version: doc-publish
 #	this will version docs/ appropriately
 	cd $(WEBSITE_DIR) && \
+	rm -rf versioned_*/version-$(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)* ; \
+	sed -i -e '/"$(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)"/d' versions.json ; \
 	yarn run docusaurus docs:version $(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)
 #	copy static versioned resources
 	cd $(WEBSITE_DIR)/static/man && \
+	rm -fr $(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)/ ; \
 	cp -a next/ $(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)/
 	cd $(WEBSITE_DIR)/static/odoc && \
+	rm -fr $(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)/ ; \
 	cp -a next/ $(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)/
 #	adjust intra-doc paths in new doc version
 	cd $(WEBSITE_DIR)/versioned_docs/version-$(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)/ && \
@@ -944,8 +950,10 @@ new-website-version: doc-publish
 	cd $(WEBSITE_DIR)/versioned_docs/version-$(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)/ && \
 	find . -type f -not -name versions.md \
 	  -exec sed -i -e 's#/next/#/$(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH)/#g' \{\} \+
-#	adjust versions.md, the page where users can navigate to other versions of the docs
+#	adjust versions.md, the page where users can navigate to other versions of the docs, unless
+#	it was already changed by an earlier run of this rule
 	cd $(WEBSITE_DIR)/ && \
+	grep -q -F 'latest released version ($(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH))' docs/versions.md || \
 	find docs versioned_docs -name versions.md \
 	  -exec sed -i -e 's#^- \[latest released version (\([^)]*\))\](/docs/getting-started)$$#- [latest released version ($(INFER_MAJOR).$(INFER_MINOR).$(INFER_PATCH))](/docs/getting-started)\n- [previous version (\1)](/docs/\1/getting-started)#' \{\} \+