add support for custom scalars -- mainly adding proper import machinery

example/caller.go

@@ -48,7 +48,7 @@ func Main() {
 		if err != nil {
 			return
 		}
-		fmt.Println("you are", viewerResp.Viewer.MyName)
+		fmt.Println("you are", viewerResp.Viewer.MyName, "created on", viewerResp.Viewer.CreatedAt.Format("2006-01-02"))
 
 	case 2:
 		username := os.Args[1]
@@ -56,7 +56,7 @@ func Main() {
 		if err != nil {
 			return
 		}
-		fmt.Println(username, "is", userResp.User.TheirName)
+		fmt.Println(username, "is", userResp.User.TheirName, "created on", userResp.User.CreatedAt.Format("2006-01-02"))
 
 	default:
 		err = fmt.Errorf("usage: %v [username]", os.Args[0])

example/generated.go

@@ -4,6 +4,7 @@ package example
 
 import (
 	"context"
+	"time"
 
 	"github.com/Khan/genqlient/graphql"
 )
@@ -13,7 +14,8 @@ type getUserResponse struct {
 }
 
 type getUserUser struct {
-	TheirName string `json:"theirName"`
+	TheirName string    `json:"theirName"`
+	CreatedAt time.Time `json:"createdAt"`
 }
 
 type getViewerResponse struct {
@@ -21,7 +23,8 @@ type getViewerResponse struct {
 }
 
 type getViewerViewerUser struct {
-	MyName string
+	MyName    string
+	CreatedAt time.Time `json:"createdAt"`
 }
 
 func getViewer(
@@ -36,6 +39,7 @@ func getViewer(
 query getViewer {
 	viewer {
 		MyName: name
+		createdAt
 	}
 }
 `,
@@ -63,6 +67,7 @@ func getUser(
 query getUser ($Login: String!) {
 	user(login: $Login) {
 		theirName: name
+		createdAt
 	}
 }
 `,

example/genqlient.graphql

@@ -1,6 +1,7 @@
 query getViewer {
   viewer {
     MyName: name
+    createdAt
   }
 }
 
@@ -8,5 +9,6 @@ query getViewer {
 query getUser($Login: String!) {
   user(login: $Login) {
     theirName: name
+    createdAt
   }
 }

example/genqlient.yaml

@@ -4,3 +4,8 @@ schema: schema.graphql
 queries:
 - genqlient.graphql
 generated: generated.go
+
+# We map github's DateTime type to Go's time.Time (which conveniently already
+# defines MarshalJSON and UnmarshalJSAON).
+scalars:
+  DateTime: time.Time