Add Direction to Layout persistence

Debated about this a long time, but I feel conceptually reading
direction is sort of the most primary layout choice so it should be part
of the Layout that is persisted. Bumped the version number of the Layout
format, but essentially this is just an addition, so the old behavior is
preserved, unless the new data is present in the Layout file, in which
case the program takes advantage of it.

Author: mftb0

cmd/cbxv/main.go

@@ -13,7 +13,7 @@ import (
 
 const (
 	NAME    = "cbxv"
-	VERSION = "0.5.6"
+	VERSION = "0.5.7"
 )
 
 // Update listens for messages on the message channel and
@@ -28,6 +28,7 @@ func update(m *model.Model, u *ui.UI, msgChan chan util.Message, msgHandlers *Me
 			(msg.TypeName != "quit" &&
 				msg.TypeName != "openFile" &&
 				msg.TypeName != "openFileResult" &&
+				msg.TypeName != "toggleDirection" &&
 				msg.TypeName != "setFullscreen") {
 			continue
 		}

internal/model/model.go

@@ -376,6 +376,7 @@ const (
 type Layout struct {
     FormatVersion string     `json:"formatVersion"`
     Comic         ComicData  `json:"comic"`
+    Direction     Direction  `json:"direction"`
     Mode          LayoutMode `json:"mode"`
     Pages         []Page     `json:"pages"`
 }
@@ -586,12 +587,13 @@ func (m *Model) PageToSpread(n int) int {
 
 func (m *Model) StoreLayout() error {
     layout := Layout{
-        FormatVersion: "0.1",
+        FormatVersion: "0.2",
     }
     c := ComicData{}
     c.Hash = m.Hash
     c.FilePath = m.FilePath
     layout.Comic = c
+    layout.Direction = m.Direction
     layout.Mode = m.LayoutMode
     layout.Pages = m.Pages
 
@@ -618,6 +620,10 @@ func (m *Model) loadLayout(hash string) *Layout {
 
     if data != nil {
         var lo Layout
+        // default Direction to whatever it's currently 
+        // set too, because it was added in 0.2 and we 
+        // want to preserve existing behavior
+        lo.Direction = m.Direction
         err := json.Unmarshal([]byte(*data), &lo)
         if err != nil {
             fmt.Printf("e:%s\n", err)
@@ -638,6 +644,10 @@ func (m *Model) joinAll() {
 }
 
 func (m *Model) applyLayout(layout *Layout) {
+    if m.Direction != layout.Direction {
+        m.SendMessage(util.Message{TypeName: "toggleDirection"})
+    }
+
     for i := range layout.Pages {
         p := layout.Pages[i]
         mp := m.Pages[i]