1 files changed, 85 insertions, 0 deletions
diff --git a/src/cmd/go/internal/modinfo/info.go b/src/cmd/go/internal/modinfo/info.go
new file mode 100644
index 0000000..b0adcbc
--- /dev/null
+++ b/src/cmd/go/internal/modinfo/info.go
@@ -0,0 +1,85 @@
+// Copyright 2018 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 modinfo
+
+import (
+	"cmd/go/internal/modfetch/codehost"
+	"encoding/json"
+	"time"
+)
+
+// Note that these structs are publicly visible (part of go list's API)
+// and the fields are documented in the help text in ../list/list.go
+
+type ModulePublic struct {
+	Path       string        `json:",omitempty"` // module path
+	Version    string        `json:",omitempty"` // module version
+	Query      string        `json:",omitempty"` // version query corresponding to this version
+	Versions   []string      `json:",omitempty"` // available module versions
+	Replace    *ModulePublic `json:",omitempty"` // replaced by this module
+	Time       *time.Time    `json:",omitempty"` // time version was created
+	Update     *ModulePublic `json:",omitempty"` // available update (with -u)
+	Main       bool          `json:",omitempty"` // is this the main module?
+	Indirect   bool          `json:",omitempty"` // module is only indirectly needed by main module
+	Dir        string        `json:",omitempty"` // directory holding local copy of files, if any
+	GoMod      string        `json:",omitempty"` // path to go.mod file describing module, if any
+	GoVersion  string        `json:",omitempty"` // go version used in module
+	Retracted  []string      `json:",omitempty"` // retraction information, if any (with -retracted or -u)
+	Deprecated string        `json:",omitempty"` // deprecation message, if any (with -u)
+	Error      *ModuleError  `json:",omitempty"` // error loading module
+
+	Origin *codehost.Origin `json:",omitempty"` // provenance of module
+	Reuse  bool             `json:",omitempty"` // reuse of old module info is safe
+}
+
+type ModuleError struct {
+	Err string // error text
+}
+
+type moduleErrorNoMethods ModuleError
+
+// UnmarshalJSON accepts both {"Err":"text"} and "text",
+// so that the output of go mod download -json can still
+// be unmarshalled into a ModulePublic during -reuse processing.
+func (e *ModuleError) UnmarshalJSON(data []byte) error {
+	if len(data) > 0 && data[0] == '"' {
+		return json.Unmarshal(data, &e.Err)
+	}
+	return json.Unmarshal(data, (*moduleErrorNoMethods)(e))
+}
+
+func (m *ModulePublic) String() string {
+	s := m.Path
+	versionString := func(mm *ModulePublic) string {
+		v := mm.Version
+		if len(mm.Retracted) == 0 {
+			return v
+		}
+		return v + " (retracted)"
+	}
+
+	if m.Version != "" {
+		s += " " + versionString(m)
+		if m.Update != nil {
+			s += " [" + versionString(m.Update) + "]"
+		}
+	}
+	if m.Deprecated != "" {
+		s += " (deprecated)"
+	}
+	if m.Replace != nil {
+		s += " => " + m.Replace.Path
+		if m.Replace.Version != "" {
+			s += " " + versionString(m.Replace)
+			if m.Replace.Update != nil {
+				s += " [" + versionString(m.Replace.Update) + "]"
+			}
+		}
+		if m.Replace.Deprecated != "" {
+			s += " (deprecated)"
+		}
+	}
+	return s
+}