chore: automating docs deployment

Auto-deploy docs on releases.
Should test it first, though.

.travis.yml

@@ -17,6 +17,6 @@ script:
 after_success:
   - bash <(curl -s https://codecov.io/bash)
   - test -n "$TRAVIS_TAG" && docker login -u="$DOCKER_USERNAME" -p="$DOCKER_PASSWORD"
-  - test -n "$TRAVIS_TAG" && go run main.go
+  - test -n "$TRAVIS_TAG" && go run main.go && make static-push
 notifications:
   email: false

Makefile

@@ -11,42 +11,54 @@ setup:
 	go get -u github.com/apex/static/cmd/static-docs
 	dep ensure
 	gometalinter --install
+.PHONY: setup
 
 # Run all the tests
 test:
 	gotestcover $(TEST_OPTIONS) -covermode=atomic -coverprofile=coverage.txt $(SOURCE_FILES) -run $(TEST_PATTERN) -timeout=2m
+.PHONY: cover
 
 # Run all the tests and opens the coverage report
 cover: test
 	go tool cover -html=coverage.txt
+.PHONY: cover
 
 # gofmt and goimports all go files
 fmt:
 	find . -name '*.go' -not -wholename './vendor/*' | while read -r file; do gofmt -w -s "$$file"; goimports -w "$$file"; done
+.PHONY: fmt
 
 # Run all the linters
 lint:
 	gometalinter --vendor ./...
+.PHONY: lint
 
 # Run all the tests and code checks
 ci: test lint
+.PHONY: ci
 
 # Build a beta version of goreleaser
 build:
 	go build
-
-HIGHLIGHT=https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0
+.PHONY: build
 
 # Generate the static documentation
 static:
-	@rm -rf ../goreleaser.github.io/theme
+	@rm -rf dist/goreleaser.github.io
+	@mkdir -p dist
+	@git clone git@github.com:goreleaser/goreleaser.github.io.git dist/goreleaser.github.io
+	@rm -rf dist/goreleaser.github.io/theme
 	@static-docs \
 		--in docs \
-		--out ../goreleaser.github.io \
+		--out dist/goreleaser.github.io \
 		--title GoReleaser \
 		--subtitle "Deliver Go binaries as fast and easily as possible" \
 		--google UA-106198408-1
-	@cd ../goreleaser.github.io && git add -A && git commit -am 'bump: docs' && git push origin master
+.PHONY: static
+
+static-push: static
+	@cd dist/goreleaser.github.io && git add -A && git commit -am 'bump: docs' && git diff --exit-code origin/master..master > /dev/null || git push origin master
+.PHONY: static-push
 
 # Show to-do items per file.
 todo: