App version is taken from version.json compiled in

This ensures that the version is always set to the correct value. making version.json the source of truth.

Fixes #146
Fixes #113

main.go

@@ -32,7 +32,7 @@ func main() {
 	app := cli.NewApp()
 	app.Name = "ipget"
 	app.Usage = "Retrieve and save IPFS objects."
-	app.Version = "0.9.2"
+	app.Version = version
 	app.Flags = []cli.Flag{
 		&cli.StringFlag{
 			Name:    "output",

version.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	_ "embed"
+	"encoding/json"
+	"runtime/debug"
+)
+
+var version string
+
+//go:embed version.json
+var versionJSON []byte
+
+func init() {
+	// Read version from embedded JSON file.
+	var verMap map[string]string
+	json.Unmarshal(versionJSON, &verMap)
+	version = verMap["version"]
+
+	// If running from a module, try to get the build info.
+	bi, ok := debug.ReadBuildInfo()
+	if !ok {
+		return
+	}
+
+	// Append the revision to the version.
+	for i := range bi.Settings {
+		if bi.Settings[i].Key == "vcs.revision" {
+			version += "-" + bi.Settings[i].Value
+			break
+		}
+	}
+}