[#22] Improve Makefile, Add better versions cmd

Makefile

@@ -1,21 +1,30 @@
-#Go parameters
+.PHONY: all install test build clean
+
+SHA=$(shell git rev-list HEAD --max-count=1 --abbrev-commit)
+TAG?=$(shell git tag -l --contains HEAD)
+VERSION=$(TAG)
+
+ifeq ($(VERSION),)
+VERSION := latest
+endif
+
 
+#Go parameters
 GOCMD=go
 GOINSTALL=$(GOCMD) install
 GOTEST=$(GOCMD) test
-DEP=dep 
-.PHONY : all install test
-
-all : def
+DEP=dep
 
-def :
-	@$(GOINSTALL) -ldflags '-s'
+all: build
 
-install: 
+install:
 	@$(DEP) ensure
 
-test:
+test: install
 	@$(GOTEST) -v ./...
 
+build:	install
+	@$(GOINSTALL) -ldflags "-X main.version=$(VERSION)-$(SHA) -s"
+
 clean:
-	rm -rf *
+	rm -rf *

cmd/version.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 	"github.com/spf13/cobra"
+	G "github.com/leopardslab/Dunner/pkg/global"
 )
 
 func init() {
@@ -14,6 +15,6 @@ var versionCmd = &cobra.Command{
 	Short: "Print the version number of Dunner",
 	Long:  `All software has versions. This is Dunners's`,
 	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Println("v0.1")
+		fmt.Println(G.VERSION)
 	},
 }

main.go

@@ -2,8 +2,12 @@ package main
 
 import (
 	"github.com/leopardslab/Dunner/cmd"
+	G "github.com/leopardslab/Dunner/pkg/global"
 )
 
+var version string = ""
+
 func main() {
+	G.VERSION = version
 	cmd.Execute()
 }

pkg/global/global.go

@@ -0,0 +1,5 @@
+package global
+
+var (
+	VERSION string
+)