gocapturedrefrace/main: Add version command line argument

I don't need to use the `flags` package here for a single boolean
option. Previously I had tried with `flags` but it conflicted with the
flags defined by `analyzer.Analyzer`.

1 files changed, 12 insertions, 1 deletions

diff --git a/cmd/gocapturedrefrace/main.go b/cmd/gocapturedrefrace/main.go
index 60c7838..5a8970b 100644
--- a/cmd/gocapturedrefrace/main.go
+++ b/cmd/gocapturedrefrace/main.go
@@ -16,14 +16,25 @@
 // along with Gocapturedrefrace. If not, see
 // <https://www.gnu.org/licenses/>.
 
-
 package main
 
 import (
+	"os"
+
 	"golang.org/x/tools/go/analysis/singlechecker"
 	"gopkg.teddywing.com/capturedrefrace"
 )
 
+var version = "0.0.1"
+
 func main() {
+	if len(os.Args) > 1 &&
+		(os.Args[1] == "-V" ||
+			os.Args[1] == "--version") {
+
+		println(version)
+		os.Exit(0)
+	}
+
 	singlechecker.Main(capturedrefrace.Analyzer)
 }