add a makeshift versioning for the executable to distinguish each build

VERSION

@@ -0,0 +1 @@
+0.2

build.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env sh
+
+# shellcheck disable=SC2155
+export GIT_COMMIT=$(git rev-list -1 HEAD)
+CANONICAL_VERSION=$(cat ./VERSION)
+VERSION_STRING="$CANONICAL_VERSION ($GIT_COMMIT)"
+
+go mod vendor
+go mod tidy
+go build -o build/gostations -ldflags "-X main.version=$VERSION_STRING"

stations.go

@@ -6,6 +6,12 @@ import (
 	"os"
 )
 
+var version float32
+
+func showVersion(){
+	fmt.Println(version)
+}
+
 func precheck(){
 	if !isInstalled(player()){
 		fmt.Printf("%s is either not installed, or not on your $PATH. Cannot continue.\n", player())
@@ -22,11 +28,12 @@ func main(){
 		state 	string
 		tags 	string
 		notok   bool
+		version	bool
 	)
 	flag.Usage = func() {
 		fmt.Printf("Usage: \n")
 		fmt.Printf(" gostations ")
-		fmt.Printf(" [-n \"name\"]  [-c \"home country\"]  [-s \"home state\"]  [-t \"ordered,tag,list\"] [-x]\n")
+		fmt.Printf(" [-n \"name\"]  [-c \"home country\"]  [-s \"home state\"]  [-t \"ordered,tag,list\"] [-x] [-v]\n")
 		flag.PrintDefaults()
 		fmt.Printf("  -h (or none)\n")
 		fmt.Printf("\tThis help message\n")
@@ -36,12 +43,19 @@ func main(){
 	flag.StringVar(&state, "s", "", "Home state (if in the United States).")
 	flag.StringVar(&tags, "t", "", "Tag (or comma-separated tag list)")
 	flag.BoolVar(&notok, "x", false,"If toggled, will show stations that are down")
+	flag.BoolVar(&version, "v", false, "Show version.")
 	flag.Parse()
 
 	if argCount == 0 {
 		flag.Usage()
 		os.Exit(0)
 	}
+
+	if version {
+		showVersion()
+		os.Exit(0)
+	}
+
 	precheck()
 
 	stations, _ := StationSearch(name, country, state, tags, notok)