v0.2.0 16 colors, default colors, /dev/tty, bracketed paste, themed form controls

tui/choice.go

@@ -0,0 +1,42 @@
+package tui
+
+import "github.com/lixenwraith/terminal"
+
+// Choice draws options in a row at (x, y), the chosen one bracketed in the
+// accent style and the rest muted ("raw [txt] json"), and returns the
+// columns it drew
+func (r Region) Choice(x, y int, options []string, chosen int, th Theme) int {
+	start := x
+	for i, o := range options {
+		open, close, style := " ", " ", th.Muted
+		if i == chosen {
+			open, close, style = "[", "]", th.Accent
+		}
+		r.TextStyled(x, y, open+o+close, style)
+		x += RuneLen(o) + 2
+	}
+	return x - start
+}
+
+// StepChoice moves a choice among n options on Left or Right (h, l),
+// stopping at either end, and reports whether it moved
+func StepChoice(key terminal.Key, r rune, chosen, n int) (int, bool) {
+	switch {
+	case (key == terminal.KeyLeft || key == terminal.KeyRune && r == 'h') && chosen > 0:
+		return chosen - 1, true
+	case (key == terminal.KeyRight || key == terminal.KeyRune && r == 'l') && chosen < n-1:
+		return chosen + 1, true
+	}
+	return chosen, false
+}
+
+// Toggle draws a switch at (x, y): the On glyph and "on" in the accent
+// style, or the Off glyph and "off" muted, and returns the columns it drew
+func (r Region) Toggle(x, y int, on bool, th Theme) int {
+	label, style := string(th.Glyphs.Off)+" off", th.Muted
+	if on {
+		label, style = string(th.Glyphs.On)+" on", th.Accent
+	}
+	r.TextStyled(x, y, label, style)
+	return RuneLen(label)
+}