add pre-submit checks (#22)

Also advertise the new feature in the README

Fixes #6

Makefile

@@ -0,0 +1,53 @@
+.DEFAULT_GOAL := help
+
+SHELL := /bin/bash
+
+GO111MODULE := on
+
+GOPKG := github.com/veraison/swid
+
+GOLINT ?= golangci-lint
+
+ifeq ($(MAKECMDGOALS),lint)
+GOLINT_ARGS ?= run --timeout=3m
+else
+  ifeq ($(MAKECMDGOALS),lint-extra)
+  GOLINT_ARGS ?= run --timeout=3m --issues-exit-code=0 -E dupl -E gocritic -E gosimple -E lll -E prealloc
+  endif
+endif
+
+.PHONY: lint lint-extra
+lint lint-extra: ; $(GOLINT) $(GOLINT_ARGS)
+
+ifeq ($(MAKECMDGOALS),test)
+GOTEST_ARGS ?= -v -race $(GOPKG)
+else
+  ifeq ($(MAKECMDGOALS),test-cover)
+  GOTEST_ARGS ?= -short -cover $(GOPKG)
+  endif
+endif
+
+COVER_THRESHOLD := $(shell grep '^name: cover' .github/workflows/ci-go-cover.yml | cut -c13-)
+
+.PHONY: test test-cover
+test test-cover: ; go test $(GOTEST_ARGS)
+
+presubmit:
+	@echo
+	@echo ">>> Check that the reported coverage figures are $(COVER_THRESHOLD)"
+	@echo
+	$(MAKE) test-cover
+	@echo
+	@echo ">>> Fix any lint error"
+	@echo
+	$(MAKE) lint
+
+.PHONY: help
+help:
+	@echo "Available targets:"
+	@echo "  * test:       run unit tests for $(GOPKG)"
+	@echo "  * test-cover: run unit tests and measure coverage for $(GOPKG)"
+	@echo "  * lint:       lint sources using default configuration"
+	@echo "  * lint-extra: lint sources using default configuration and some extra checkers"
+	@echo "  * presubmit:  check you are ready to push your local branch to remote"
+	@echo "  * help:       print this menu"

README.md

@@ -5,3 +5,11 @@ The `swid` package provides a golang API for manipulating Software Identificatio
 ## Resources
 
 * [Package Documentation](https://pkg.go.dev/github.com/veraison/swid)
+
+## Developer tips
+
+Before doing a PR (and routinely during the dev/test cycle) run
+```
+make presubmit
+```
+and check its output to make sure your code coverage figures are in line with the target and that there are no newly introduced lint problems.