Added Makefile and version info

.gitignore

@@ -1,6 +1,9 @@
 # the binaries themselves
-/mtxconv
-/mtxconv.exe
+/mtxconv*
+
+# garbage
+Thumbs.db
+.DS_Store
 
 # test directory
 /test

Makefile

@@ -0,0 +1,58 @@
+GIT_BRANCH       := $(shell git rev-parse --abbrev-ref HEAD)
+GIT_COMMIT       := $(shell git rev-parse HEAD)
+GIT_COMMIT_SHORT := $(shell git rev-parse --short HEAD)
+GIT_VERSION      := $(shell git describe --tags --always --dirty)
+GIT_TAG          := $(shell git describe --tags)
+BUILD_TIME       := $(shell date -u +"%Y-%m-%dT%H:%M:%S %Z")
+
+LDFLAGS := -ldflags '\
+-X "mtxconv/constants.GitBranch=$(GIT_BRANCH)" \
+-X "mtxconv/constants.GitCommit=$(GIT_COMMIT)" \
+-X "mtxconv/constants.GitCommitShort=$(GIT_COMMIT_SHORT)" \
+-X "mtxconv/constants.GitVersion=$(GIT_VERSION)" \
+-X "mtxconv/constants.GitTag=$(GIT_TAG)" \
+-X "mtxconv/constants.BuildTime=$(BUILD_TIME)"'
+BINARY_NAME = mtxconv
+GOCMD    = go
+GOFORMAT = $(GOCMD) fmt
+GOBUILD  = $(GOCMD) build -trimpath
+GOCLEAN  = $(GOCMD) clean
+GOTEST   = $(GOCMD) test
+GOGET    = $(GOCMD) get
+GOBUILDEXT = $(GOBUILD) -o $(BINARY_NAME) $(LDFLAGS)
+
+.EXPORT_ALL_VARIABLES:
+	GOAMD64 = v3
+.PHONY: build buildall image test format clean run debug deps
+build:
+	$(GOBUILDEXT)
+	@echo Build completed…
+buildall:
+	@echo Building windows-x64…
+	@GOOS=windows GOARCH=amd64 $(GOBUILD) -o $(BINARY_NAME)-windows-x64.exe $(LDFLAGS)
+	@echo Building macos-x64…
+	@GOOS=darwin GOARCH=amd64 $(GOBUILD) -o $(BINARY_NAME)-macos-x64 $(LDFLAGS)
+	@echo Building macos-arm64…
+	@GOOS=darwin GOARCH=arm64 $(GOBUILD) -o $(BINARY_NAME)-macos-arm64 $(LDFLAGS)
+	@echo Building linux-x64…
+	@GOOS=linux GOARCH=amd64 $(GOBUILD) -o $(BINARY_NAME)-linux-x64 $(LDFLAGS)
+	@echo Building linux-arm64…
+	@GOOS=linux GOARCH=arm64 $(GOBUILD) -o $(BINARY_NAME)-linux-arm64 $(LDFLAGS)
+test: build
+	$(GOTEST) -v ./...
+format:
+	$(GOFORMAT) ./...
+clean:
+	$(GOCLEAN)
+	rm -f ./$(BINARY_NAME)
+	rm -f ./$(BINARY_NAME)-windows-x64.exe
+	rm -f ./$(BINARY_NAME)-macos-x64
+	rm -f ./$(BINARY_NAME)-macos-arm64
+	rm -f ./$(BINARY_NAME)-linux-x64
+	rm -f ./$(BINARY_NAME)-linux-arm64
+run: build
+	./$(BINARY_NAME)
+debug: build
+	./$(BINARY_NAME) --debug
+deps:
+	$(GOGET)

constants/constants.go

@@ -0,0 +1,46 @@
+package constants
+
+import (
+	"log"
+	"time"
+)
+
+var (
+	GitBranch      = "n/a"
+	GitCommit      = "n/a"
+	GitCommitShort = "n/a"
+	GitVersion     = "n/a"
+	GitTag         = "v0.0.0" // provide default value that can be parsed
+	BuildTime      = "n/a"
+)
+
+const (
+	BuildTimeFormat = "2006-01-02T15:04:05 MST"
+)
+
+func ParseBuildTime() *time.Time {
+	parsed, err := time.Parse(BuildTimeFormat, BuildTime)
+	if err != nil {
+		log.Printf("ParseBuildTime: %v", err.Error())
+		return nil
+	}
+
+	return &parsed
+}
+
+func ParseBuildTimeLocal() *time.Time {
+	parsed, err := time.Parse(BuildTimeFormat, BuildTime)
+	if err != nil {
+		log.Printf("ParseBuildTimeLocal: %v", err.Error())
+		return nil
+	}
+
+	localLocation, err := time.LoadLocation("Local")
+	if err != nil {
+		log.Printf("ParseBuildTimeLocal: %v", err.Error())
+		return nil
+	}
+
+	localTime := parsed.In(localLocation)
+	return &localTime
+}