Goreleaser (#394)

When publishing binaries using Goreleaser use build flags.

Also remove custom archives and checksum name_templates because
Goreleaser has reasonable defaults, see https://goreleaser.com/customization/#Archive

.goreleaser.yml

@@ -22,15 +22,14 @@ builds:
       - GOPROXY=https://proxy.golang.org
       - GOSUMDB=sum.golang.org
     main: ./mockgen/
-archive:
-  format: tar.gz
-  wrap_in_directory: true
-  name_template: '{{ .Binary }}-{{ .Version }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
-  files:
-    - LICENSE
-    - README.md
+
+archives:
+ - format: tar.gz
+   wrap_in_directory: true
+   files:
+     - LICENSE
+     - README.md
 checksum:
-  name_template: '{{ .Binary }}-{{ .Version }}-checksums.txt'
 snapshot:
   name_template: "snap-{{ .Commit }}"
 changelog:

mockgen/mockgen.go

@@ -45,6 +45,12 @@ const (
 	gomockImportPath = "github.com/golang/mock/gomock"
 )
 
+var (
+	version = ""
+	commit  = "none"
+	date    = "unknown"
+)
+
 var (
 	source          = flag.String("source", "", "(source mode) Input Go source file; enables source mode.")
 	destination     = flag.String("destination", "", "Output file; defaults to stdout.")
@@ -55,14 +61,14 @@ var (
 	copyrightFile   = flag.String("copyright_file", "", "Copyright file used to add copyright header")
 
 	debugParser = flag.Bool("debug_parser", false, "Print out parser results only.")
-	version     = flag.Bool("version", false, "Print version.")
+	showVersion = flag.Bool("version", false, "Print version.")
 )
 
 func main() {
 	flag.Usage = usage
 	flag.Parse()
 
-	if *version {
+	if *showVersion {
 		printVersion()
 		return
 	}
@@ -633,3 +639,11 @@ func lookupPackageName(importPath string) (string, bool) {
 	}
 	return pkg.Name, true
 }
+
+func printVersion() {
+	if version != "" {
+		fmt.Printf("v%s\nCommit: %s\nDate: %s\n", version, commit, date)
+	} else {
+		printModuleVersion()
+	}
+}

mockgen/version.1.11.go

@@ -20,7 +20,7 @@ import (
 	"log"
 )
 
-func printVersion() {
+func printModuleVersion() {
 	log.Printf("No version information is available for Mockgen compiled with " +
 		"version 1.11")
 }

mockgen/version.1.12.go

@@ -23,7 +23,7 @@ import (
 	"runtime/debug"
 )
 
-func printVersion() {
+func printModuleVersion() {
 	if bi, exists := debug.ReadBuildInfo(); exists {
 		fmt.Println(bi.Main.Version)
 	} else {