added version command

Makefile

@@ -1,5 +1,14 @@
+VERSION = $$(git describe --abbrev=0 --tags)
+COMMIT_REV = $$(git rev-list -n 1 $(VERSION))
+
+version:
+	@echo $(VERSION)
+
+commit_rev:
+	@echo $(COMMIT_REV)
+
 build:
-	go build -o bin/tui
+	go build -ldflags "-X github.com/tomekz/coincap-tui/cmd.version=$(VERSION)" -o bin/tui
 
 run: build
 	./bin/tui

README.md

@@ -3,7 +3,7 @@ coincap-tui let's you check crypto prices in your terminal.
 
 Features:
 - fetch crypto assets data from [ coincap ](https://docs.coincap.io/) REST API
-- save favourites 
+- Favourties: save and view favourite coins
 - display results in tabular format
 - nice UI with [bubble-tea](https://github.com/charmbracelet/bubbletea)
 

cmd/root.go

@@ -34,6 +34,7 @@ Features:
 // Execute adds all child commands to the root command and sets flags appropriately.
 // This is called by main.main(). It only needs to happen once to the rootCmd.
 func Execute() {
+	rootCmd.AddCommand(VersionCmd())
 	err := rootCmd.Execute()
 	if err != nil {
 		os.Exit(1)

cmd/version.go

@@ -0,0 +1,41 @@
+package cmd
+
+import (
+	"fmt"
+	"runtime/debug"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+var version string
+
+// Version returns coincap-tui version
+func Version() string {
+	ver := "(devel)"
+	if version != "" {
+		ver = version
+	} else if buildInfo, ok := debug.ReadBuildInfo(); ok {
+		ver = buildInfo.Main.Version
+	}
+
+	if !strings.HasPrefix(ver, "v") {
+		ver = fmt.Sprintf("v%s", ver)
+	}
+
+	return ver
+}
+
+// VersionCmd ...
+func VersionCmd() *cobra.Command {
+	versionCmd := &cobra.Command{
+		Use:   "version",
+		Short: "Displays the current version",
+		Long:  `The version command displays the current version`,
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Println(Version())
+		},
+	}
+
+	return versionCmd
+}

main.go

@@ -7,6 +7,8 @@ import (
 	"github.com/tomekz/coincap-tui/cmd"
 )
 
+var version string
+
 func main() {
 	cmd.Execute()
 }