Workaround for semver serealization (#26)

Will be made obsolete when Masterminds/semver#228 is merged

pluginInterface/v1/plugin.go

@@ -1,7 +1,6 @@
 package plugin
 
 import (
-	"github.com/Masterminds/semver/v3"
 	"github.com/hashicorp/hcl/v2"
 	"github.com/hashicorp/hcl/v2/hcldec"
 	"github.com/zclconf/go-cty/cty"
@@ -24,7 +23,7 @@ type Plugin struct {
 	// "text", "plugin_a", etc.
 	Name string
 	// version of the plugin `Kind Name` that is provided by the current binary
-	Version semver.Version
+	Version Version
 	// Specification of the `config` block for this plugin
 	// If nil - providing a `config Kind Name` is an error
 	ConfigSpec hcldec.Spec
@@ -36,7 +35,7 @@ type Args struct {
 	// Specifies which kind, name and version of plugin to execute
 	Kind    string
 	Name    string
-	Version semver.Version
+	Version Version
 
 	// Result of decoding a config block with ConfigSpec
 	Config cty.Value

pluginInterface/v1/semver.go

@@ -0,0 +1,23 @@
+package plugin
+
+import "github.com/Masterminds/semver/v3"
+
+// semver.Version doesn't implement MarshalBinary/UnmarshalBinary required for
+// gob (which is required by net/rpc, which is required by go-plugin).
+// This is a temporary workaround, I expect they are going to add these methods
+// after [my PR](https://github.com/Masterminds/semver/pull/228) is accepted
+
+type Version semver.Version
+
+func (v Version) MarshalBinary() ([]byte, error) {
+	return semver.Version(v).MarshalText()
+}
+
+func (v *Version) UnmarshalBinary(data []byte) error {
+	return (*semver.Version)(v).UnmarshalText(data)
+}
+
+// Returns the wrapped `semver.Version`.
+func (v *Version) Cast() *semver.Version {
+	return (*semver.Version)(v)
+}