1 files changed, 35 insertions, 0 deletions
diff --git a/gopls/internal/lsp/fake/proxy.go b/gopls/internal/lsp/fake/proxy.go
new file mode 100644
index 000000000..9e56efeb1
--- /dev/null
+++ b/gopls/internal/lsp/fake/proxy.go
@@ -0,0 +1,35 @@
+// Copyright 2020 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 fake
+
+import (
+	"fmt"
+
+	"golang.org/x/tools/internal/proxydir"
+)
+
+// WriteProxy creates a new proxy file tree using the txtar-encoded content,
+// and returns its URL.
+func WriteProxy(tmpdir string, files map[string][]byte) (string, error) {
+	type moduleVersion struct {
+		modulePath, version string
+	}
+	// Transform into the format expected by the proxydir package.
+	filesByModule := make(map[moduleVersion]map[string][]byte)
+	for name, data := range files {
+		modulePath, version, suffix := splitModuleVersionPath(name)
+		mv := moduleVersion{modulePath, version}
+		if _, ok := filesByModule[mv]; !ok {
+			filesByModule[mv] = make(map[string][]byte)
+		}
+		filesByModule[mv][suffix] = data
+	}
+	for mv, files := range filesByModule {
+		if err := proxydir.WriteModuleVersion(tmpdir, mv.modulePath, mv.version, files); err != nil {
+			return "", fmt.Errorf("error writing %s@%s: %v", mv.modulePath, mv.version, err)
+		}
+	}
+	return proxydir.ToURL(tmpdir), nil
+}