cli: Improve version reporting. (#103)

.github/workflows/release.yml

@@ -23,5 +23,6 @@ jobs:
           sha256sum: true
           project_path: cmd
           binary_name: scip
+          ldflags: "-X 'main.Reproducible=true'"
           asset_name: scip-${{ matrix.goos }}-${{ matrix.goarch }}
           extra_files: LICENSE

cmd/main.go

@@ -1,8 +1,12 @@
 package main
 
 import (
+	_ "embed"
+	"fmt"
 	"log"
 	"os"
+	"runtime/debug"
+	"strings"
 
 	"github.com/urfave/cli/v2"
 )
@@ -23,10 +27,38 @@ func commands() []*cli.Command {
 	return []*cli.Command{&convert, &lint, &print, &snapshot, &stats}
 }
 
+//go:embed version.txt
+var version string
+
+var Reproducible = "" // set by ldflags in CI
+
+func gitSuffix() string {
+	if Reproducible != "" {
+		return ""
+	}
+	var rev, timestamp string
+	clean := "true"
+	if buildInfo, ok := debug.ReadBuildInfo(); ok {
+		for _, kv := range buildInfo.Settings {
+			switch kv.Key {
+			case "vcs.revision":
+				rev = kv.Value
+			case "vcs.time":
+				timestamp = kv.Value
+			case "vcs.modified":
+				if kv.Value == "true" {
+					clean = "false"
+				}
+			}
+		}
+	}
+	return fmt.Sprintf("-dev\nSHA: %s\ntimestamp: %s\nclean: %s", rev, timestamp, clean)
+}
+
 func scipApp() *cli.App {
 	app := &cli.App{
 		Name:        "scip",
-		Version:     "v0.2.1-git",
+		Version:     fmt.Sprintf("v%s%s", strings.TrimSpace(version), gitSuffix()),
 		Usage:       "SCIP Code Intelligence Protocol CLI",
 		Description: "For more details, see the project README at:\n\n\thttps://github.com/sourcegraph/scip",
 		Commands:    commands(),

cmd/main_test.go

@@ -19,6 +19,10 @@ import (
 	"github.com/sourcegraph/scip/cmd/tests/reprolang/bindings/go/repro"
 )
 
+func TestMain(m *testing.M) {
+	Reproducible = "true"
+}
+
 func TestCLIReferenceInSync(t *testing.T) {
 	app := scipApp()
 	readmeBytes, err := os.ReadFile(filepath.Join("..", "docs", "CLI.md"))

cmd/version.txt

@@ -0,0 +1 @@
+0.2.1