add input widget, filter menu

grid.go

@@ -141,6 +141,10 @@ func Display(g *Grid) bool {
 		expand = true
 		ui.StopLoop()
 	})
+	ui.Handle("/sys/kbd/f", func(ui.Event) {
+		menu = FilterMenu
+		ui.StopLoop()
+	})
 	ui.Handle("/sys/kbd/h", func(ui.Event) {
 		menu = HelpMenu
 		ui.StopLoop()
@@ -148,7 +152,7 @@ func Display(g *Grid) bool {
 	ui.Handle("/sys/kbd/q", func(ui.Event) {
 		ui.StopLoop()
 	})
-	ui.Handle("/sys/kbd/r", func(ui.Event) {
+	ui.Handle("/sys/kbd/r", func(e ui.Event) {
 		GlobalConfig.toggle("sortReversed")
 	})
 	ui.Handle("/sys/kbd/s", func(ui.Event) {

menus.go

@@ -24,6 +24,19 @@ func HelpMenu() {
 	ui.Loop()
 }
 
+func FilterMenu() {
+	i := widgets.NewInput()
+	i.TextFgColor = ui.ColorWhite
+	i.BorderLabel = "Filter"
+	i.BorderFg = ui.ColorCyan
+	ui.Render(i)
+	i.InputHandlers()
+	ui.Handle("/sys/kbd/<enter>", func(ui.Event) {
+		ui.StopLoop()
+	})
+	ui.Loop()
+}
+
 func SortMenu() {
 	m := widgets.NewMenu(SortFields())
 	m.Selectable = true

widgets/input.go

@@ -0,0 +1,64 @@
+package widgets
+
+import (
+	"strings"
+
+	ui "github.com/gizak/termui"
+)
+
+var (
+	input_chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_."
+)
+
+type Input struct {
+	ui.Block
+	Label       string
+	Data        string
+	TextFgColor ui.Attribute
+	TextBgColor ui.Attribute
+}
+
+func NewInput() *Input {
+	i := &Input{
+		Block:       *ui.NewBlock(),
+		Label:       "input",
+		TextFgColor: ui.ThemeAttr("par.text.fg"),
+		TextBgColor: ui.ThemeAttr("par.text.bg"),
+	}
+	i.Width, i.Height = 30, 3
+	return i
+}
+
+func (i *Input) Buffer() ui.Buffer {
+	var cell ui.Cell
+	buf := i.Block.Buffer()
+
+	x := x_padding
+	for _, ch := range i.Data {
+		cell = ui.Cell{Ch: ch, Fg: i.TextFgColor, Bg: i.TextBgColor}
+		buf.Set(x, 1, cell)
+		x++
+	}
+
+	return buf
+}
+
+func (i *Input) KeyPress(e ui.Event) {
+	ch := strings.Replace(e.Path, "/sys/kbd/", "", -1)
+	if ch == "C-8" {
+		idx := len(i.Data) - 1
+		if idx > -1 {
+			i.Data = i.Data[0:idx]
+		}
+		ui.Render(i)
+	}
+	if strings.Index(input_chars, ch) > -1 {
+		i.Data += ch
+		ui.Render(i)
+	}
+}
+
+// Setup some default handlers for menu navigation
+func (i *Input) InputHandlers() {
+	ui.Handle("/sys/kbd/", i.KeyPress)
+}