Initial commit with some working code and basic example.

examples/helloworld/Makefile

@@ -0,0 +1,29 @@
+GO := $(shell which go)
+GO112_VERSION := 1.12.16
+GO112 := go${GO112_VERSION}
+
+GOPHERJS := $(shell which gopherjs 2> /dev/null)
+
+## start-web       : Starts GopherJS serving.
+start-web:
+	GOPHERJS_GOROOT="${HOME}/sdk/${GO112}" ${GOPHERJS} serve . -v
+
+## prepare         : Installs Go 1.12 and GopherJS. Go must be already installed.
+prepare: prepare-go prepare-gopherjs
+
+## prepare-go      : Prepares specific Go tooling for GopherJS. Go must be already installed.
+prepare-go:
+	@echo "* Getting Go 1.12.16 (required by gopherjs)"
+	@${GO} get golang.org/dl/${GO112}
+	@${GO112} download
+
+## prepare-gopherjs: Prepares GopherJS (e.g. compiles it).
+prepare-gopherjs:
+	@echo "* Getting gopherjs..."
+	@${GO112} get -u -v github.com/gopherjs/gopherjs
+
+help : Makefile
+	@echo "helloworld Makefile available subcommands:\n"
+	@sed -n 's/^## //p' $<
+
+.DEFAULT_GOAL := help