/api/trends prints pie of each of last N months

src/ledger/like.go

@@ -35,6 +35,12 @@ func LikeAfter(date string) Like {
 	}
 }
 
+func LikeNotName(pattern string) Like {
+	return func(d Delta) bool {
+		return !like(pattern, d.Name)
+	}
+}
+
 func LikeName(pattern string) Like {
 	return func(d Delta) bool {
 		return like(pattern, d.Name)

src/view/chart.go

@@ -23,6 +23,8 @@ func NewChart(name string) Chart {
 		return NewBar()
 	case "stack":
 		return NewStack()
+	case "pie":
+		return NewPie()
 	default:
 		panic("bad chart name " + name)
 	}
@@ -107,3 +109,33 @@ func (stack Stack) AddY(name string, v []int) {
 			Stack: "stackA",
 		}))
 }
+
+type Pie struct {
+	*charts.Pie
+	series []opts.PieData
+}
+
+func NewPie() *Pie {
+	return &Pie{Pie: charts.NewPie()}
+}
+
+func (pie *Pie) AddX(v interface{}) {
+}
+
+func (pie *Pie) Render(w io.Writer) error {
+	pie.AddSeries("", pie.series)
+	return pie.Pie.Render(w)
+}
+
+func (pie *Pie) AddY(name string, v []int) {
+	for _, v := range v {
+		pie.series = append(pie.series, opts.PieData{
+			Name:  fmt.Sprintf("%s ($%d)", name, v),
+			Value: v,
+		})
+	}
+}
+
+func (pie *Pie) Overlap(other Chart) {
+	panic("nope")
+}