Print dh-make-golang version at the start of make

Set to v0.3.3 release

main.go

@@ -8,24 +8,28 @@ import (
 	"github.com/gregjones/httpcache"
 )
 
+const program = "dh-make-golang"
+
 var (
 	gitHub *github.Client
 )
 
 func usage() {
-	fmt.Fprintf(os.Stderr, "%s is a tool that converts Go packages into Debian package source.\n", os.Args[0])
+	fmt.Fprintf(os.Stderr, "%s\n", buildVersionString())
+	fmt.Fprintf(os.Stderr, "\n")
+	fmt.Fprintf(os.Stderr, "%s is a tool that converts Go packages into Debian package source.\n", program)
 	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "Usage:\n\t%s [globalflags] <command> [flags] <args>\n", os.Args[0])
+	fmt.Fprintf(os.Stderr, "Usage:\n\t%s [globalflags] <command> [flags] <args>\n", program)
 	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "%s commands:\n", os.Args[0])
+	fmt.Fprintf(os.Stderr, "%s commands:\n", program)
 	fmt.Fprintf(os.Stderr, "\tmake\t\t\tcreate a Debian package\n")
 	fmt.Fprintf(os.Stderr, "\tsearch\t\t\tsearch Debian for already-existing packages\n")
 	fmt.Fprintf(os.Stderr, "\testimate\t\testimate the amount of work for a package\n")
 	fmt.Fprintf(os.Stderr, "\tcreate-salsa-project\tcreate a project for hosting Debian packaging\n")
 	fmt.Fprintf(os.Stderr, "\n")
 	fmt.Fprintf(os.Stderr, "For backwards compatibility, when no command is specified,\nthe make command is executed.\n")
 	fmt.Fprintf(os.Stderr, "\n")
-	fmt.Fprintf(os.Stderr, "To learn more about a command, run \"%s <command> -help\",\ne.g. \"%s make -help\"\n", os.Args[0], os.Args[0])
+	fmt.Fprintf(os.Stderr, "To learn more about a command, run \"%s <command> -help\",\ne.g. \"%s make -help\"\n", program, program)
 	fmt.Fprintf(os.Stderr, "\n")
 }
 

make.go

@@ -784,6 +784,14 @@ func execMake(args []string, usage func()) {
 			"Valid values are \"a\", \"at\" and \"ast\", see wrap-and-sort(1) man page\n"+
 			"for more information.")
 
+	// ====================================================================
+	//
+	// Start actual make routine
+	//
+	// ====================================================================
+
+	log.Printf("Starting %q", buildVersionString())
+
 	err := fs.Parse(args)
 	if err != nil {
 		log.Fatal(err)

version_current.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+// Version represents the dh-make-golang build version.
+type Version struct {
+	major      int
+	minor      int
+	patch      int
+	preRelease string
+}
+
+var currentVersion = Version{
+	major:      0,
+	minor:      3,
+	patch:      3,
+	preRelease: "",
+}
+
+func (v Version) String() string {
+	return fmt.Sprintf("%d.%d.%d%s", v.major, v.minor, v.patch, v.preRelease)
+}
+
+func buildVersionString() string {
+	version := "v" + currentVersion.String()
+	osArch := runtime.GOOS + "/" + runtime.GOARCH
+	return fmt.Sprintf("%s %s %s", program, version, osArch)
+}