add doc2go (#13)

* build script: CLI arg `--generate-code-documentation`

* README: document doc2go

Dockerfile

@@ -31,6 +31,7 @@ RUN apt update && apt install -y zip \
 		| tar --strip-components=1 -C /usr/local/bin -xzf - --wildcards 'golangci-lint-*-linux-amd64/golangci-lint' \
 	&& rm -rf /go/pkg \
 	&& mkdir /tmp/protoc && cd /tmp/protoc \
+ 	&& curl --fail --location https://github.com/abhinav/doc2go/releases/download/v0.8.1/doc2go-linux-amd64.tar.gz | tar -C /usr/local/bin/ -xzf - doc2go \
 	&& ln -s /usr/bin/build-go-project.sh /build-common.sh \
 	&& git config --global --add safe.directory /workspace \
 	&& true

README.md

@@ -37,6 +37,7 @@ Features
 - [Protobuf](https://developers.google.com/protocol-buffers) compiler included
 - [Deployer](https://github.com/function61/deployer) integration
 	* For packaging `deployerspec.zip` files
+- [doc2go](https://github.com/abhinav/doc2go/) for generating documentation (use case: private documentation). See [why godoc isn't enough](https://github.com/golang/go/issues/2381).
 
 Standardized build process:
 

build-go-project.sh

@@ -174,6 +174,8 @@ standardBuildProcess() {
 
 	buildstep packageLambdaFunction
 
+	buildstep generateCodeDocs
+
 	if [ ! -z ${GOFMT_TARGETS+x} ]; then
 		echo "ERROR: GOFMT_TARGETS is deprecated"
 		exit 1
@@ -197,6 +199,16 @@ function packageLambdaFunction {
 	)
 }
 
+# uses doc2go to (auto)generate documentation for Go code.
+# https://abhinav.github.io/doc2go/
+# use case: private projects for which https://pkg.go.dev/ docs aren't accessible.
+function generateCodeDocs {
+	local docsTempDir="/tmp/docsite"
+	rm -rf "$docsTempDir"
+	doc2go -out "$docsTempDir" ./...
+	tar -C "$docsTempDir" . -czf rel/code-documentation.tar.gz
+}
+
 # not being sourced?
 #
 # when we don't go into the if, we're in backwards compatiblity mode. this script used to be sourced,
@@ -207,9 +219,10 @@ function packageLambdaFunction {
 # so the new style is to just invoke this script with args.
 if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
 	SKIP_PACKAGELAMBDAFUNCTION=y
+	SKIP_GENERATECODEDOCS=y
 
 	# we don't use short options but "-o" needs to be set, otherwise it mysteriously just doesn't work...
-	options=$(getopt -l "directory:,binary-basename:,aws-lambda-zip" -o "" -a -- "$@")
+	options=$(getopt -l "directory:,binary-basename:,aws-lambda-zip,generate-code-documentation" -o "" -a -- "$@")
 
 	eval set -- "$options"
 
@@ -227,6 +240,9 @@ if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
 	--aws-lambda-zip)
 		unset SKIP_PACKAGELAMBDAFUNCTION
 		;;
+	--generate-code-documentation)
+		unset SKIP_GENERATECODEDOCS
+		;;
 	--)
 		shift
 		break;;
@@ -247,6 +263,7 @@ if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
 		SKIP_CODEGENERATION=y
 		SKIP_STATICANALYSIS=y
 		SKIP_TESTS=y
+		SKIP_GENERATECODEDOCS=y
 	fi
 
 	standardBuildProcess