[wip] api refactor

Signed-off-by: Alex Goodman <alex.goodman@anchore.com>

internal/version/guess.go

@@ -0,0 +1,46 @@
+package version
+
+import (
+	"github.com/anchore/syft/internal/log"
+	"runtime/debug"
+	"strings"
+)
+
+func Guess() string {
+	v := FromBuild().Version
+	if strings.HasPrefix(v, "v") {
+		return v
+	}
+
+	buildInfo, ok := debug.ReadBuildInfo()
+	if !ok {
+		log.Warn("syft version could not be determined: unable to find the buildinfo section of the binary")
+		return v
+	}
+
+	var found bool
+	for _, d := range buildInfo.Deps {
+		if d.Path == "github.com/anchore/syft" {
+			v = d.Version
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		// look for probable forks
+		for _, d := range buildInfo.Deps {
+			if strings.HasSuffix(d.Path, "/syft") {
+				v = d.Version
+				found = true
+				break
+			}
+		}
+	}
+
+	if !found {
+		log.Warn("syft version could not be determined: unable to find syft within the buildinfo section of the binary")
+	}
+
+	return v
+}