Added 'view logs binding'

widgets/view.go

@@ -0,0 +1,91 @@
+package widgets
+
+import (
+	ui "github.com/gizak/termui"
+	"fmt"
+)
+
+type TextView struct {
+	ui.Block
+	inputStream <- chan string
+	render      chan bool
+	Text        []string // all the text
+	TextOut     []string // text to be displayed
+	TextFgColor ui.Attribute
+	TextBgColor ui.Attribute
+	padding     Padding
+}
+
+func NewTextView(lines <- chan string) *TextView {
+	i := &TextView{
+		Block:       *ui.NewBlock(),
+		inputStream: lines,
+		render:      make(chan bool),
+		Text:        []string{},
+		TextOut:     []string{},
+		TextFgColor: ui.ThemeAttr("menu.text.fg"),
+		TextBgColor: ui.ThemeAttr("menu.text.bg"),
+		padding:     Padding{4, 2},
+	}
+
+	i.BorderFg = ui.ThemeAttr("menu.border.fg")
+	i.BorderLabelFg = ui.ThemeAttr("menu.label.fg")
+
+	ui.Clear()
+	i.Height = ui.TermHeight()
+	i.Width = ui.TermWidth()
+
+	i.readInputLoop()
+	i.renderLoop()
+	return i
+}
+
+func (i *TextView) Buffer() ui.Buffer {
+
+	var cell ui.Cell
+	buf := i.Block.Buffer()
+
+	x := i.Block.X + i.padding[0]
+	y := i.Block.Y + i.padding[1]
+
+	for _, line := range i.TextOut {
+		for _, ch := range line {
+			cell = ui.Cell{Ch: ch, Fg: i.TextFgColor, Bg: i.TextBgColor}
+			buf.Set(x, y, cell)
+			x++
+		}
+		x = i.Block.X + i.padding[0]
+		y++
+	}
+	return buf
+}
+
+func (i *TextView) renderLoop() {
+	go func() {
+		for range i.render {
+			size := i.Height - (i.padding[1] * 2)
+			if size > len(i.Text) {
+				size = len(i.Text)
+			}
+			i.TextOut = i.Text[len(i.Text) - size:]
+
+			width := i.Width - (i.padding[0] * 2)
+			for n := range i.TextOut {
+				if len(i.TextOut[n]) > width {
+					i.TextOut[n] = fmt.Sprintf("%s...", i.TextOut[n][:width - 3])
+				}
+			}
+			ui.Render(i)
+		}
+	}()
+}
+
+func (i *TextView) readInputLoop() {
+	go func() {
+		for line := range i.inputStream {
+			i.Text = append(i.Text, line)
+			i.render <- true
+		}
+		close(i.render)
+	}()
+}