internal/dinosql: support Postgres macaddr type in Go (#358)

Also add an end to end test.

Fixes #353.

Author: kevinburke1

internal/dinosql/gen.go

@@ -243,6 +243,9 @@ func InterfaceImports(r Generateable, settings config.CombinedSettings) [][]stri
 	if uses("net.IP") {
 		std["net"] = struct{}{}
 	}
+	if uses("net.HardwareAddr") {
+		std["net"] = struct{}{}
+	}
 
 	pkg := make(map[string]struct{})
 	overrideTypes := map[string]string{}
@@ -298,6 +301,9 @@ func ModelImports(r Generateable, settings config.CombinedSettings) [][]string {
 	if UsesType(r, "net.IP", settings) {
 		std["net"] = struct{}{}
 	}
+	if UsesType(r, "net.HardwareAddr", settings) {
+		std["net"] = struct{}{}
+	}
 
 	// Custom imports
 	pkg := make(map[string]struct{})
@@ -693,6 +699,9 @@ func (r Result) goInnerType(col core.Column, settings config.CombinedSettings) s
 	case "inet":
 		return "net.IP"
 
+	case "macaddr", "macaddr8":
+		return "net.HardwareAddr"
+
 	case "void":
 		// A void value always returns NULL. Since there is no built-in NULL
 		// value into the SQL package, we'll use sql.NullBool

internal/endtoend/testdata/macaddr/go/db.go

@@ -0,0 +1,4 @@
+CREATE TABLE foo (bar bool not null, addr macaddr not null);
+
+-- name: Get :many
+SELECT bar, addr FROM foo LIMIT $1;

internal/endtoend/testdata/macaddr/go/models.go

@@ -0,0 +1,9 @@
+{
+  "version": "1",
+  "packages": [{
+    "path": "go",
+	"name": "querytest",
+	"schema": "query.sql",
+	"queries": "query.sql"
+  }]
+}

internal/endtoend/testdata/macaddr/go/query.sql.go

@@ -7,7 +7,7 @@ CREATE TYPE status AS ENUM ('open', 'closed');
 
 CREATE TABLE venue (
     id               SERIAL primary key,
-	create_at        timestamp    not null,
+    create_at        timestamp    not null,
     status           status       not null,
     slug             text         not null,
     name             varchar(255) not null,