add std Makefile including release target for easily making new release numbers

Author: Randall C. O'Reilly

Makefile

@@ -0,0 +1,74 @@
+# Basic Go makefile
+
+GOCMD=go
+GOBUILD=$(GOCMD) build
+GOCLEAN=$(GOCMD) clean
+GOTEST=$(GOCMD) test
+GOGET=$(GOCMD) get
+
+DIRS=`go list ./...`
+
+all: build
+
+build: 
+	@echo "GO111MODULE = $(value GO111MODULE)"
+	$(GOBUILD) -v $(DIRS)
+
+test: 
+	@echo "GO111MODULE = $(value GO111MODULE)"
+	$(GOTEST) -v $(DIRS)
+
+clean: 
+	@echo "GO111MODULE = $(value GO111MODULE)"
+	$(GOCLEAN) ./...
+
+fmts:
+	gofmt -s -w .
+	
+vet:
+	@echo "GO111MODULE = $(value GO111MODULE)"
+	$(GOCMD) vet $(DIRS) | grep -v unkeyed
+
+tidy: export GO111MODULE = on
+tidy:
+	@echo "GO111MODULE = $(value GO111MODULE)"
+	go mod tidy
+	
+mod-update: export GO111MODULE = on
+mod-update:
+	@echo "GO111MODULE = $(value GO111MODULE)"
+	go get -u ./...
+	go mod tidy
+
+# gopath-update is for GOPATH to get most things updated.
+# need to call it in a target executable directory
+gopath-update: export GO111MODULE = off
+gopath-update:
+	@echo "GO111MODULE = $(value GO111MODULE)"
+	go get -u ./...
+	
+# NOTE: MUST update version number here prior to running 'make release' and edit this file! 
+VERS=v0.3.2
+PACKAGE=main
+GIT_COMMIT=`git rev-parse --short HEAD`
+VERS_DATE=`date -u +%Y-%m-%d\ %H:%M`
+VERS_FILE=version.go
+
+release:
+	/bin/rm -f $(VERS_FILE)
+	@echo "// WARNING: auto-generated by Makefile release target -- run 'make release' to update" > $(VERS_FILE)
+	@echo "" >> $(VERS_FILE)
+	@echo "package $(PACKAGE)" >> $(VERS_FILE)
+	@echo "" >> $(VERS_FILE)
+	@echo "const (" >> $(VERS_FILE)
+	@echo "	Version = \"$(VERS)\"" >> $(VERS_FILE)
+	@echo "	GitCommit = \"$(GIT_COMMIT)\" // the commit JUST BEFORE the release" >> $(VERS_FILE)
+	@echo "	VersionDate = \"$(VERS_DATE)\" // UTC" >> $(VERS_FILE)
+	@echo ")" >> $(VERS_FILE)
+	@echo "" >> $(VERS_FILE)
+	/bin/cat $(VERS_FILE)
+	git commit -am "$(VERS) release"
+	git tag -a $(VERS) -m "$(VERS) release"
+	git push
+	git push origin --tags
+

version.go

@@ -0,0 +1,9 @@
+// WARNING: auto-generated by Makefile release target -- run 'make release' to update
+
+package main
+
+const (
+	Version     = "v0.3.2"
+	GitCommit   = "59cf4a4"          // the commit JUST BEFORE the release
+	VersionDate = "2020-11-23 23:26" // UTC
+)