Add initial prototype

cmd/start.go

@@ -0,0 +1,218 @@
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"os/exec"
+	"os/user"
+
+	"github.com/davegallant/srv/internal"
+	"github.com/jroimartin/gocui"
+)
+
+// Controller can access Feeds and Config
+var Controller *internal.Controller
+
+var (
+	viewArr     = []string{"feeds", "Items"}
+	active      = 0
+	currentFeed = 0 // TODO: move to Controller
+)
+
+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]
+	ov, _ := g.View("Items")
+
+	ov.Clear()
+	for _, item := range feed.Items {
+		fmt.Fprintln(ov, "-", item.Title)
+	}
+	nextView(g, ov)
+
+	return nil
+}
+
+// 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]
+	viewer := Controller.Config.ExternalViewer
+	err := exec.Command(viewer, item.Link).Start()
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	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()
+	//hideLoading(g)
+	return nil
+}
+
+// statically map all of the keys
+func keybindings(g *gocui.Gui) error {
+	if err := g.SetKeybinding("", gocui.KeyTab, gocui.ModNone, nextView); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("", gocui.KeyArrowDown, gocui.ModNone, cursorDown); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("", gocui.KeyArrowUp, gocui.ModNone, cursorUp); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("feeds", gocui.KeyEnter, gocui.ModNone, openFeed); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("Items", gocui.KeyEnter, gocui.ModNone, openItem); err != nil {
+		return err
+	}
+	if err := g.SetKeybinding("", gocui.KeyF5, gocui.ModNone, refreshFeeds); err != nil {
+		return err
+	}
+	return nil
+}
+
+func setCurrentViewOnTop(g *gocui.Gui, name string) (*gocui.View, error) {
+	if _, err := g.SetCurrentView(name); err != nil {
+		return nil, err
+	}
+	return g.SetViewOnTop(name)
+}
+
+func nextView(g *gocui.Gui, v *gocui.View) error {
+	nextIndex := (active + 1) % len(viewArr)
+	name := viewArr[nextIndex]
+
+	_, err := g.View("Items")
+	if err != nil {
+		return err
+	}
+
+	if _, err := setCurrentViewOnTop(g, name); err != nil {
+		return err
+	}
+
+	if nextIndex == 0 || nextIndex == 3 {
+		g.Cursor = true
+	} else {
+		g.Cursor = false
+	}
+
+	active = nextIndex
+	return nil
+}
+
+func layout(g *gocui.Gui) error {
+	maxX, maxY := g.Size()
+	if v, err := g.SetView("feeds", 0, 0, maxX-1, maxY/4-1); err != nil {
+		if err != gocui.ErrUnknownView {
+			return err
+		}
+		v.Title = "Feeds"
+		v.Highlight = true
+		v.SelBgColor = gocui.ColorGreen
+		v.SelFgColor = gocui.ColorBlack
+
+		if _, err = setCurrentViewOnTop(g, "feeds"); err != nil {
+			return err
+		}
+		for _, f := range Controller.Rss.Feeds {
+			fmt.Fprintln(v, "-", f.Title)
+		}
+	}
+	if v, err := g.SetView("Items", 0, maxY/4, maxX-1, maxY-1); err != nil {
+		if err != gocui.ErrUnknownView {
+			return err
+		}
+		v.Title = "Items"
+		v.Highlight = true
+		v.SelBgColor = gocui.ColorGreen
+		v.SelFgColor = gocui.ColorBlack
+	}
+	return nil
+}
+
+func quit(g *gocui.Gui, v *gocui.View) error {
+	return gocui.ErrQuit
+}
+
+// Start initializes the application
+func Start() {
+	usr, err := user.Current()
+	if err != nil {
+		log.Fatal(err)
+	}
+	configPath := usr.HomeDir + "/.config/srv/config.yaml"
+
+	Controller = &internal.Controller{}
+	Controller.Init(configPath)
+
+	g, err := gocui.NewGui(gocui.OutputNormal)
+	if err != nil {
+		log.Panicln(err)
+	}
+	defer g.Close()
+
+	g.SetManagerFunc(layout)
+
+	if err := keybindings(g); err != nil {
+		log.Panicln(err)
+	}
+
+	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
+		log.Panicln(err)
+	}
+}