add fallback version info (#212)

* fallback

* improve logic

Author: JohannesKaufmann

cli/html2markdown/main.go

@@ -2,18 +2,39 @@ package main
 
 import (
 	"os"
+	"runtime/debug"
 
 	"github.com/JohannesKaufmann/html-to-markdown/v2/cli/html2markdown/cmd"
 )
 
 var (
 	// These are set by goreleaser:
-	version = "dev"
-	commit  = "none"
+	version = "unknown"
+	commit  = "unknown"
 	date    = "unknown"
 )
 
 func main() {
+	// Fall back to build info when ldflags are not set by goreleaser.
+	// This makes `go install` and `go build` report some appropriate fallback values.
+	if info, ok := debug.ReadBuildInfo(); ok {
+		if version == "unknown" && info.Main.Version != "" && info.Main.Version != "(devel)" {
+			version = info.Main.Version
+		}
+		for _, s := range info.Settings {
+			switch s.Key {
+			case "vcs.revision":
+				if commit == "unknown" && len(s.Value) >= 7 {
+					commit = s.Value[:7]
+				}
+			case "vcs.time":
+				if date == "unknown" && s.Value != "" {
+					date = s.Value // e.g. "2026-05-07T19:14:37Z"
+				}
+			}
+		}
+	}
+
 	release := cmd.Release{
 		Version: version,
 		Commit:  commit,