Git: components 301-320

inline_diff.go

@@ -0,0 +1,66 @@
+package mujica
+
+import (
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/internal"
+	"mujicaui/theme"
+)
+
+// InlineDiffOptions configure an InlineDiff.
+type InlineDiffOptions struct {
+	// Mono sets the lines in the code font.
+	Mono bool
+}
+
+type inlineDiffCache struct {
+	from, to string
+	a, b     []internal.WordSpan
+	done     bool
+}
+
+// InlineDiff shows old and new lines with changed words marked.
+func InlineDiff(c *ui.Context, from, to string, opts InlineDiffOptions) *ui.Element {
+	k := Tokens(c)
+	col := ui.Column(c).AlignItems(ui.Stretch).Shrink(0).Radius(theme.ControlRadius).Clip()
+	cache := ui.Local(col, "words", func() *inlineDiffCache { return &inlineDiffCache{} })
+	w := *cache
+	if !w.done || w.from != from || w.to != to {
+		w.a, w.b = internal.WordDiff(from, to)
+		w.from, w.to, w.done = from, to, true
+	}
+	if opts.Mono {
+		col.Font(theme.MonoFont)
+	}
+	col.Children(func() {
+		inlineDiffLine(c, "−", msg(c, "inline_diff.removed"), w.a, k.Danger, k)
+		inlineDiffLine(c, "+", msg(c, "inline_diff.added"), w.b, k.Success, k)
+	})
+	return col
+}
+
+// inlineDiffLine shows one side with its changed words marked.
+func inlineDiffLine(c *ui.Context, sign, name string, spans []internal.WordSpan, col ui.Color, k theme.Tokens) {
+	u := Density(c).Unit()
+	out := make([]ui.Span, 0, len(spans))
+	plain := ""
+	for _, s := range spans {
+		plain += s.Text
+		sp := ui.Span{Text: s.Text}
+		switch s.Op {
+		case internal.DiffDelete:
+			sp.Background, sp.Strikethrough, sp.DecorationColor = col.Mix(k.Surface, 0.7), true, col
+		case internal.DiffInsert:
+			sp.Background, sp.Underline, sp.DecorationColor = col.Mix(k.Surface, 0.7), true, col
+		}
+		out = append(out, sp)
+	}
+	if len(out) == 0 {
+		out = append(out, ui.Span{Text: " "})
+	}
+	ui.Row(c).AlignItems(ui.Start).Gap(u*2).Padding(u, u*3).Background(col.Mix(k.Surface, 0.9)).Label(name + ": " + plain).
+		Children(func() {
+			ui.Text(c, sign).Font(theme.MonoFont).FontWeight(700).TextColor(col).Shrink(0)
+			ui.RichText(c, out...).TextColor(k.Text).MinWidth(0)
+		})
+}