Add --version

.goreleaser.yaml

@@ -21,6 +21,7 @@ builds:
     mod_timestamp: "{{ .CommitTimestamp }}"
     ldflags:
       - -s -w
+      - -X main.Version={{.Version}}
 
 archives:
   - formats: tar.gz

main.go

@@ -12,6 +12,7 @@ import (
 	"os"
 	"os/exec"
 	"runtime"
+	"runtime/debug"
 	"runtime/pprof"
 	"slices"
 	"sort"
@@ -42,6 +43,17 @@ const (
 	zeroOIDSHA256             = "0000000000000000000000000000000000000000000000000000000000000000"
 )
 
+var Version = "dev"
+
+func init() {
+	if Version != "dev" {
+		return
+	}
+	if bi, ok := debug.ReadBuildInfo(); ok && bi.Main.Version != "" && bi.Main.Version != "(devel)" {
+		Version = bi.Main.Version
+	}
+}
+
 var (
 	cpuProfile    = newOption("")
 	memProfile    = newOption("")
@@ -69,6 +81,7 @@ func newRootCommand() *cobra.Command {
 	root := &cobra.Command{
 		Use:               "git-spdx",
 		Short:             "Find license changes across Git history",
+		Version:           Version,
 		SilenceErrors:     true,
 		SilenceUsage:      true,
 		CompletionOptions: cobra.CompletionOptions{DisableDefaultCmd: true},

main_test.go

@@ -459,6 +459,13 @@ func cli(t *testing.T, args ...string) string {
 	return string(out)
 }
 
+func TestCLIVersion(t *testing.T) {
+	out := cli(t, "--version")
+	if !strings.HasPrefix(out, "git-spdx version ") {
+		t.Fatalf("--version output = %q", out)
+	}
+}
+
 func TestCLI(t *testing.T) {
 	repo := repository(t)
 	commitFile(t, repo, "source.go", "// SPDX-License-Identifier: MIT\npackage example\n", "Add source")