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`.

2 files changed, 12 insertions, 3 deletions

diff --git a/capturedrefrace.go b/capturedrefrace.go
index 21a8b2d..b58ed9d 100644
--- a/capturedrefrace.go
+++ b/capturedrefrace.go
@@ -29,8 +29,6 @@ import (
 	"golang.org/x/tools/go/ast/inspector"
 )
 
-var version = "0.0.1"
-
 var Analyzer = &analysis.Analyzer{
 	Name:     "capturedrefrace",
 	Doc:      "reports captured references in goroutine closures",
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)
 }