Git: components 301-320

diff_stat.go

@@ -0,0 +1,72 @@
+package mujica
+
+import (
+	"fmt"
+	"math"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/theme"
+)
+
+// DiffStatOptions configure a DiffStat.
+type DiffStatOptions struct {
+	// Blocks is the ratio bar length; zero means 5.
+	Blocks int
+}
+
+// DiffStat shows added and deleted counts with a ratio bar.
+func DiffStat(c *ui.Context, added, deleted int, opts DiffStatOptions) *ui.Element {
+	if added < 0 || deleted < 0 {
+		panic("mujica: DiffStat counts must not be negative")
+	}
+	n := opts.Blocks
+	if n == 0 {
+		n = 5
+	}
+	if n < 0 {
+		panic("mujica: DiffStat Blocks is negative")
+	}
+	k := Tokens(c)
+	u := Density(c).Unit()
+	plus, minus := diffStatBlocks(added, deleted, n)
+	row := ui.Row(c).AlignItems(ui.Center).Gap(u * 2).Shrink(0).
+		Label(fmt.Sprintf(msg(c, "diff_stat.label"), added, deleted))
+	row.Children(func() {
+		mono := func(s string, col ui.Color) {
+			ui.Text(c, s).Font(theme.MonoFont).FontFeatures("tnum").FontSize(FontSize(c, theme.CaptionSize)).TextColor(col).SingleLine()
+		}
+		mono(fmt.Sprintf("+%d", added), k.Success)
+		mono(fmt.Sprintf("−%d", deleted), k.Danger)
+		ui.Row(c).Gap(2).Shrink(0).Role(ui.RoleNone).Children(func() {
+			for i := range n {
+				col := k.Border
+				switch {
+				case i < plus:
+					col = k.Success
+				case i < plus+minus:
+					col = k.Danger
+				}
+				ui.Box(c).Size(8, 8).Radius(1).Background(col)
+			}
+		})
+	})
+	return row
+}
+
+// diffStatBlocks splits n blocks, one at least per nonzero side.
+func diffStatBlocks(added, deleted, n int) (plus, minus int) {
+	total := added + deleted
+	if total == 0 {
+		return 0, 0
+	}
+	plus = int(math.Round(float64(added) / float64(total) * float64(n)))
+	minus = n - plus
+	if added > 0 && plus == 0 {
+		plus, minus = 1, n-1
+	}
+	if deleted > 0 && minus == 0 && n > 1 {
+		plus, minus = n-1, 1
+	}
+	return plus, minus
+}