Initialize module and dependencies

vendor/golang.org/x/vuln/internal/traces/traces.go

@@ -0,0 +1,46 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package traces
+
+import (
+	"golang.org/x/vuln/internal/govulncheck"
+)
+
+// Compact returns a summarization of finding.Trace. The first
+// returned element is the vulnerable symbol and the last element
+// is the exit point of the user module. There can also be two
+// elements in between, if applicable, which are the two elements
+// preceding the user module exit point.
+func Compact(finding *govulncheck.Finding) []*govulncheck.Frame {
+	if len(finding.Trace) < 1 {
+		return nil
+	}
+	iTop := len(finding.Trace) - 1
+	topModule := finding.Trace[iTop].Module
+	// search for the exit point of the top module
+	for i, frame := range finding.Trace {
+		if frame.Module == topModule {
+			iTop = i
+			break
+		}
+	}
+
+	if iTop == 0 {
+		// all in one module, reset to the end
+		iTop = len(finding.Trace) - 1
+	}
+
+	compact := []*govulncheck.Frame{finding.Trace[0]}
+	if iTop > 1 {
+		if iTop > 2 {
+			compact = append(compact, finding.Trace[iTop-2])
+		}
+		compact = append(compact, finding.Trace[iTop-1])
+	}
+	if iTop > 0 {
+		compact = append(compact, finding.Trace[iTop])
+	}
+	return compact
+}