Determine when to apply autoscroll

When shrinking the window, scrolling was limited to only the current
view buffer. This should implement auto-scrolling. It's a little bit
janky, but should be sufficient for now.

controller/controller.go

@@ -1,17 +1,15 @@
 package controller
 
 import (
-	"time"
-
 	config "github.com/davegallant/srv/config"
 	feeds "github.com/davegallant/srv/feeds"
 )
 
 // Controller keeps everything together
 type Controller struct {
-	Config     config.Configuration
-	lastUpdate time.Time
-	Rss        *feeds.RSS
+	Config      config.Configuration
+	Rss         *feeds.RSS
+	CurrentFeed int
 }
 
 // Init initiates the controller with config
@@ -19,4 +17,5 @@ func (c *Controller) Init(conf string) {
 	c.Config = config.LoadConfiguration(conf)
 	c.Rss = &feeds.RSS{}
 	c.Rss.Update(c.Config.Feeds)
+	c.CurrentFeed = 0
 }

cui/main.go

@@ -11,43 +11,19 @@ import (
 	"github.com/jroimartin/gocui"
 )
 
-// Controller can access Feeds and Config
+// Controller can access internal state
 var Controller *controller.Controller
 
 var (
-	viewArr     = []string{"feeds", "Items"}
-	active      = 0
-	currentFeed = 0 // TODO: move to Controller
+	viewArr = []string{"feeds", "Items"}
+	active  = 0
 )
 
-func cursorDown(g *gocui.Gui, v *gocui.View) error {
-	if v != nil {
-		cx, cy := v.Cursor()
-		if err := v.SetCursor(cx, cy+1); err != nil {
-			v.SetCursor(cx, cy-1)
-		}
-	}
-	return nil
-}
-
-func cursorUp(g *gocui.Gui, v *gocui.View) error {
-	if v != nil {
-		ox, oy := v.Origin()
-		cx, cy := v.Cursor()
-		if err := v.SetCursor(cx, cy-1); err != nil && oy > 0 {
-			if err := v.SetOrigin(ox, oy-1); err != nil {
-				return err
-			}
-		}
-	}
-	return nil
-}
-
 // openFeed opens all items in the feed
 func openFeed(g *gocui.Gui, v *gocui.View) error {
-	_, cy := v.Cursor()
-	currentFeed = cy
-	feed := Controller.Rss.Feeds[currentFeed]
+	_, oy := v.Origin()
+	feed := Controller.Rss.Feeds[oy]
+	Controller.CurrentFeed = oy
 	ov, _ := g.View("Items")
 
 	ov.Clear()
@@ -61,8 +37,8 @@ func openFeed(g *gocui.Gui, v *gocui.View) error {
 
 // openItem opens the feed in an external browser
 func openItem(g *gocui.Gui, v *gocui.View) error {
-	_, cy := v.Cursor()
-	item := Controller.Rss.Feeds[currentFeed].Items[cy]
+	_, oy := v.Origin()
+	item := Controller.Rss.Feeds[Controller.CurrentFeed].Items[oy]
 	err := exec.Command(
 		Controller.Config.ExternalViewer,
 		append(Controller.Config.ExternalViewerArgs, item.Link)...).Start()
@@ -74,30 +50,8 @@ func openItem(g *gocui.Gui, v *gocui.View) error {
 	return nil
 }
 
-func showLoading(g *gocui.Gui) error {
-	maxX, maxY := g.Size()
-	if v, err := g.SetView("loading", maxX/2-4, maxY/2-1, maxX/2+4, maxY/2+1); err != nil {
-		if err != gocui.ErrUnknownView {
-			return err
-		}
-		fmt.Fprintln(v, "Loading")
-	}
-	return nil
-}
-
-func hideLoading(g *gocui.Gui) error {
-	if err := g.DeleteView("loading"); err != nil {
-		if err != gocui.ErrUnknownView {
-			return err
-		}
-	}
-	return nil
-}
-
 func refreshFeeds(g *gocui.Gui, v *gocui.View) error {
-	showLoading(g)
 	Controller.Rss.Update(Controller.Config.Feeds)
-	//hideLoading(g)
 	return nil
 }
 
@@ -137,10 +91,10 @@ func layout(g *gocui.Gui) error {
 		if err != gocui.ErrUnknownView {
 			return err
 		}
-		v.Title = "Feeds"
 		v.Highlight = true
 		v.SelBgColor = selectionBgColor
 		v.SelFgColor = selectionFgColor
+		v.Title = "Feeds"
 
 		if _, err = setCurrentViewOnTop(g, "feeds"); err != nil {
 			return err
@@ -153,10 +107,10 @@ func layout(g *gocui.Gui) error {
 		if err != gocui.ErrUnknownView {
 			return err
 		}
-		v.Title = "Items"
 		v.Highlight = true
 		v.SelBgColor = selectionBgColor
 		v.SelFgColor = selectionFgColor
+		v.Title = "Items"
 	}
 	return nil
 }

cui/scroll.go

@@ -0,0 +1,41 @@
+package cui
+
+import (
+	"strings"
+
+	"github.com/jroimartin/gocui"
+)
+
+func scroll(g *gocui.Gui, v *gocui.View, direction int) error {
+	if v != nil {
+
+		_, y := v.Size()
+		ox, oy := v.Origin()
+		cx, cy := v.Cursor()
+
+		if err := v.SetCursor(cx, cy-1); err != nil && oy > 0 {
+			if err := v.SetOrigin(ox, oy-1); err != nil {
+				return err
+			}
+		}
+		// If we're nearing a boundary
+		if oy+direction > strings.Count(v.ViewBuffer(), "\n")+y-direction {
+			v.Autoscroll = true
+		} else {
+			v.Autoscroll = false
+			v.SetOrigin(ox, oy+direction)
+			return nil
+
+		}
+
+	}
+	return nil
+}
+
+func cursorDown(g *gocui.Gui, v *gocui.View) error {
+	return scroll(g, v, 1)
+}
+
+func cursorUp(g *gocui.Gui, v *gocui.View) error {
+	return scroll(g, v, -1)
+}