Initial version of ted-v2.

src/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+    "fmt"
+)
+
+func main() {
+    uiCtx, _ := NewUI()
+
+    uiCtx.Redraw()
+    uiCtx.NextEvent()    
+
+    uiCtx.Close()
+    fmt.Printf("OK!")
+}

src/makefile

@@ -0,0 +1,8 @@
+
+GOFILES = main.go ui.go
+
+ted: $(GOFILES)
+	go build -o ted $(GOFILES)
+
+clean:
+	-rm ted

src/ui.go

@@ -0,0 +1,146 @@
+/**
+ * UI package.
+ */
+package main
+
+import "github.com/nsf/termbox-go"
+
+
+// ==========================================================================
+// UI event.
+
+/**
+ * The types of events.
+ */
+type    EventType   int
+const (
+    EventKeyPress   EventType   =   iota
+)
+
+/**
+ * An event callback
+ */
+type UiEvent struct {
+    eventType       EventType
+    eventPar        int   
+}
+
+// ==========================================================================
+// UI component.
+
+type UiComponent interface {
+    /**
+     * Request to redraw this component.
+     */
+    Redraw(x int, y int, w int, h int)
+
+    /**
+     * Request the minimum dimensions of the component (width, height).  If
+     * either dimension is -1, no minimum is imposed.
+     */
+    RequestDims() (int, int)
+}
+
+
+// ==========================================================================
+// UI context.
+
+/**
+ * Ui context type.
+ */
+type Ui struct {
+    statusBar       UiComponent
+}
+
+
+/**
+ * Creates a new UI context.  This also initializes the UI state.
+ * Returns the context and an error.
+ */
+func NewUI() (*Ui, error) {
+    termboxError := termbox.Init()
+
+    if termboxError != nil {
+        return nil, termboxError
+    } else {
+        uiCtx := &Ui{&UiStatusBar{"Hello", "World"}}
+        return uiCtx, nil
+    }
+}
+
+
+/**
+ * Closes the UI context.
+ */
+func (ui *Ui) Close() {
+    termbox.Close()
+}
+
+
+/**
+ * Redraws the UI.
+ */
+func (ui *Ui) Redraw() {
+    var width, height int = termbox.Size()
+    ui.redrawInternal(width, height)
+}
+
+/**
+ * Internal redraw function which does not query the terminal size.
+ */
+func (ui *Ui) redrawInternal(width, height int) {
+    termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
+
+    // TODO: This will eventually offload to UI "components"
+
+    // Draws the status bar
+    ui.statusBar.Redraw(0, height - 2, width, 2)
+
+    termbox.Flush()
+}
+
+
+/**
+ * Waits for a UI event.  Returns the event (if it's relevant to the user).
+ */
+func (ui *Ui) NextEvent() UiEvent {
+    for {
+        event := termbox.PollEvent()
+        if event.Type == termbox.EventResize {
+            ui.redrawInternal(event.Width, event.Height)
+        } else {
+            return UiEvent{EventKeyPress, 0}
+        }
+    }
+}
+
+
+// ==========================================================================
+// Status bar component
+
+type UiStatusBar struct {
+    left    string          // Left aligned string
+    right   string          // Right aligned string
+}
+
+// Minimum dimensions
+func (sbar *UiStatusBar) RequestDims() (int, int) {
+    return -1, 2
+}
+
+// Status bar redraw
+func (sbar *UiStatusBar) Redraw(x int, y int, w int, h int) {
+    leftLen := len(sbar.left)
+    rightLen := len(sbar.right)
+    rightPos := w - rightLen
+    
+    for x1 := 0; x1 < w; x1++ {
+        var runeToPrint rune = ' '
+        if x1 < leftLen {
+            runeToPrint = rune(sbar.left[x1])
+        } else if x1 >= rightPos {
+            runeToPrint = rune(sbar.right[x1 - rightPos])
+        }
+        termbox.SetCell(x1, y, runeToPrint, termbox.AttrReverse, termbox.AttrReverse)
+    }
+}