Initial blob-reading and json-encoding stubs

main.go

@@ -3,6 +3,8 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"io/ioutil"
+	"io"
 	"os"
 	"srcd.works/go-git.v4"
@@ -30,6 +32,31 @@ type Repo struct {
 	ToCommit   *object.Commit
 }
+type ReaderAsJSONString struct {
+	io.Reader
+}
+
+func (r *ReaderAsJSONString) MarshalJSON() ([]byte, error) {
+	/* TODO: fewer copies
+	out := bytes.NewBuffer(nil)
+	err := out.WriteByte('"')
+	_, err = io.Copy(out, r.Reader) // FIXME: convert to valid JSON string data, escape quote marks
+	err = out.WriteByte('"')
+	return out.Bytes(), err
+	*/
+
+	data, err := ioutil.ReadAll(r.Reader)
+	if err != nil {
+		return nil, err
+	}
+
+	return json.Marshal(string(data))
+}
+
+type Req struct {
+	Blob *ReaderAsJSONString `json:"blob"`
+}
+
 func NewRepo(projectPath string, fromSHA string, toSHA string) (*Repo, error) {
 	out := &Repo{}
@@ -167,10 +194,18 @@ func main() {
 	insOrModFile := func(file *object.File) {
 		fmt.Println("Write", file.Name)
+		// Read & json-encode the file so we do the same work as the Ruby version
+		reader, err := file.Blob.Reader()
+		if err != nil {
+			os.Exit(1)
+		}
+		json.NewEncoder(ioutil.Discard).Encode(&Req{&ReaderAsJSONString{reader}})
+		reader.Close()
 	}
 	delFile := func(file *object.File) {
 		fmt.Println("Delete", file.Name)
+		// The Ruby version doesn't read the file either
 	}
 	// index_blobs
@@ -178,6 +213,14 @@ func main() {
 	commit := func(c *object.Commit) {
 		fmt.Println("Commit", c.ID())
+		// TODO: Read & json-encode the commit so we do the same disc work as the ruby version
+		//reader, err := c.Blob.Reader()
+		//if err != nil {
+		//	os.Exit(1)
+		//}
+		//json.NewEncoder(ioutil.Discard).Encode(&Req{&ReaderAsJSONString{reader}})
+		//reader.Close()
+
 	}
 	// index_commits