refactor to add ViewManager and View structs

Signed-off-by: Jakub Sokołowski <jakub@status.im>

keys.go

@@ -12,22 +12,6 @@ type Binding struct {
 	Handler func(g *gocui.Gui, v *gocui.View) error
 }
 
-var bindings = [...]Binding{
-	Binding{gocui.KeyCtrlC, gocui.ModNone, quit},
-	Binding{gocui.KeyArrowUp, gocui.ModNone, HandlerCursorDispenser(-1)},
-	Binding{gocui.KeyArrowDown, gocui.ModNone, HandlerCursorDispenser(1)},
-}
-
-func keybindings(g *gocui.Gui) error {
-	for _, b := range bindings {
-		// IDEA: I can pass a method instead of a function here
-		if err := g.SetKeybinding("", b.Key, b.Mod, b.Handler); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
 func HandlerCursorDispenser(mod int) func(g *gocui.Gui, v *gocui.View) error {
 	return func(g *gocui.Gui, v *gocui.View) error {
 		if v == nil {

main.go

@@ -28,15 +28,48 @@ func main() {
 	}
 	defer g.Close()
 
+	views := []*View{
+		&View{
+			Name:        "main",
+			Title:       "Peers",
+			Placeholder: "Loading peers...",
+			Cursor:      true,
+			Highlight:   true,
+			Current:     true,
+			SelFgColor:  gocui.ColorBlack,
+			SelBgColor:  gocui.ColorGreen,
+			Keybindings: []Binding{
+				Binding{gocui.KeyCtrlC, gocui.ModNone, quit},
+				Binding{gocui.KeyArrowUp, gocui.ModNone, HandlerCursorDispenser(-1)},
+				Binding{gocui.KeyArrowDown, gocui.ModNone, HandlerCursorDispenser(1)},
+			},
+			TopLeft: func(mx, my int) (int, int) {
+				return 0, 0
+			},
+			BotRight: func(mx, my int) (int, int) {
+				return mx - 1, my / 2
+			},
+		},
+		&View{
+			Name:        "info",
+			Title:       "Details",
+			Placeholder: "Loading details...",
+			TopLeft: func(mx, my int) (int, int) {
+				return 0, my/2 + 1
+			},
+			BotRight: func(mx, my int) (int, int) {
+				return mx - 1, my - 1
+			},
+		},
+	}
+
+	vm := NewViewManager(g, views)
+
 	g.SelFgColor = gocui.ColorGreen
 	g.Highlight = true
 	g.Cursor = true
 
-	g.SetManagerFunc(layout)
-
-	if err := keybindings(g); err != nil {
-		log.Panicln(err)
-	}
+	g.SetManagerFunc(vm.Layout)
 
 	url := fmt.Sprintf("http://%s:%d", host, port)
 	c, err := newClient(url)
@@ -52,30 +85,6 @@ func main() {
 	}
 }
 
-func layout(g *gocui.Gui) error {
-	maxX, maxY := g.Size()
-	if v, err := g.SetView("main", 0, 0, maxX-1, maxY/2); err != nil {
-		if err != gocui.ErrUnknownView {
-			return err
-		}
-		v.SelFgColor = gocui.ColorBlack
-		v.SelBgColor = gocui.ColorGreen
-		v.Title = "Peers"
-		v.Highlight = true
-		v.SetCursor(0, 0)
-		g.SetCurrentView("main")
-		fmt.Fprintln(v, "Loading peers...")
-	}
-	if v, err := g.SetView("info", 0, maxY/2+1, maxX-1, maxY-1); err != nil {
-		if err != gocui.ErrUnknownView {
-			return err
-		}
-		v.Title = "Details"
-		fmt.Fprintln(v, "Loading details...")
-	}
-	return nil
-}
-
 func quit(g *gocui.Gui, v *gocui.View) error {
 	close(threadDone)
 	return gocui.ErrQuit

view.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/jroimartin/gocui"
+)
+
+type View struct {
+	Name        string
+	Title       string
+	Placeholder string
+	Cursor      bool
+	Current     bool
+	Highlight   bool
+	TopLeft     func(int, int) (int, int)
+	BotRight    func(int, int) (int, int)
+	SelBgColor  gocui.Attribute
+	SelFgColor  gocui.Attribute
+	Keybindings []Binding
+	Manager     ViewManager
+}
+
+type ViewManager struct {
+	g     *gocui.Gui
+	views []*View
+}
+
+func NewViewManager(g *gocui.Gui, views []*View) *ViewManager {
+	vm := ViewManager{
+		g:     g,
+		views: views,
+	}
+	// Attach a ViewManager instance to Views
+	for _, v := range vm.views {
+		v.Manager = vm
+	}
+	return &vm
+}
+
+func (m *ViewManager) Layout(g *gocui.Gui) error {
+	mx, my := g.Size()
+
+	for _, cfg := range m.views {
+		x0, y0 := cfg.TopLeft(mx, my)
+		x1, y1 := cfg.BotRight(mx, my)
+
+		v, err := g.SetView(cfg.Name, x0, y0, x1, y1)
+		if err == nil && err != gocui.ErrUnknownView {
+			return err
+		}
+		v.SelFgColor = cfg.SelFgColor
+		v.SelBgColor = cfg.SelBgColor
+		v.Title = cfg.Title
+		v.Highlight = cfg.Highlight
+
+		if cfg.Cursor {
+			v.SetCursor(0, 0)
+		}
+		if cfg.Current {
+			g.SetCurrentView("main")
+		}
+		fmt.Fprintln(v, cfg.Placeholder)
+		cfg.SetKeybindings(g)
+	}
+	return nil
+}
+
+func (v *View) SetKeybindings(g *gocui.Gui) error {
+	for _, b := range v.Keybindings {
+		// IDEA: I can pass a method instead of a function here
+		if err := g.SetKeybinding("", b.Key, b.Mod, b.Handler); err != nil {
+			return err
+		}
+	}
+	return nil
+}