fix: Add a Makefile (#100)

I do not have time to be hunting build commands around, particularly
those buried deep down in GitHub Action workflow files.

This is very basic: build the thing. It tries to avoid rebuilding stuff
if not necessary, but it's not perfect. Run `make clean && make build`
if you switch versions.

Signed-off-by: Marcelo E. Magallon <[email protected]>

Author: mem

Makefile

@@ -0,0 +1,50 @@
+ROOTDIR                := $(abspath $(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
+GO_WORKSPACE           := $(abspath $(dir $(filter-out off,$(shell go env GOWORK))))
+LOCAL_K6_VERSION       := $(shell GOWORK=off go list -m go.k6.io/k6 | cut -d' ' -f2)
+WORKSPACE_K6_VERSION   := $(shell go list -m go.k6.io/k6 | cut -d' ' -f2)
+# This is gross.
+GSM_API_GO_CLIENT_HASH := $(shell grep github.com/grafana/gsm-api-go-client@ .github/workflows/push-pr-release.yaml | sed -e 's,.*@,,; s,[^a-f0-9].*,,')
+GSM_API_GO_CLIENT      := github.com/grafana/gsm-api-go-client@$(GSM_API_GO_CLIENT_HASH)
+
+ifneq ($(strip $(GO_WORKSPACE)),)
+GSM_API_GO_CLIENT_DIR  := $(abspath $(ROOTDIR)/../gsm-api-go-client)
+GSM_API_GO_CLIENT      := github.com/grafana/gsm-api-go-client=$(GSM_API_GO_CLIENT_DIR)
+GSM_API_GO_CLIENT_SRCS := $(shell go list -json $(GSM_API_GO_CLIENT_DIR) | jq -r '.Dir as $$dir | .GoFiles[]? | [$$dir, .] | join("/")')
+endif
+
+XK6_SM_SRCS            := $(shell go list -json $(ROOTDIR) | jq -r '.Dir as $$dir | .GoFiles[]? | [$$dir, .] | join("/")')
+
+.DEFAULT_GOAL := all
+
+.PHONY: all
+all: build
+	@echo "Done."
+
+.PHONY: build
+build:
+	@true
+
+build: dist/k6
+dist/k6: $(XK6_SM_SRCS)
+	@mkdir -p '$(dir $@)'
+	xk6 build '$(LOCAL_K6_VERSION)' \
+		--output '$@' \
+		--with 'github.com/grafana/xk6-sm=$(ROOTDIR)'
+
+ifeq ($(strip $(GO_WORKSPACE)),)
+# This is here to force a rebuild every time if we are using a remote gsm-api-go-client.
+.PHONY: dist/k6-gsm
+endif
+
+build: dist/k6-gsm
+dist/k6-gsm: $(XK6_SM_SRCS)
+dist/k6-gsm: $(GSM_API_GO_CLIENT_SRCS)
+	@mkdir -p '$(dir $@)'
+	xk6 build '$(WORKSPACE_K6_VERSION)' \
+		--output '$@' \
+		--with 'github.com/grafana/xk6-sm=$(ROOTDIR)' \
+		--with '$(GSM_API_GO_CLIENT)'
+
+.PHONY: clean
+clean:
+	rm -rf dist