first commit

pigo/internal/cli/ui/width_test.go

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+package ui
+
+import "testing"
+
+// TestWidthASCII pins that plain ASCII counts one cell per rune.
+func TestWidthASCII(t *testing.T) {
+	if got := Width("hello"); got != 5 {
+		t.Errorf("Width(\"hello\") = %d, want 5", got)
+	}
+}
+
+// TestWidthCJK pins that East Asian wide runes count as two cells, which is the
+// whole reason we route width through lipgloss instead of len/RuneCount.
+func TestWidthCJK(t *testing.T) {
+	// Three CJK ideographs = 6 cells.
+	if got := Width("达克克"); got != 6 {
+		t.Errorf("Width(CJK x3) = %d, want 6", got)
+	}
+	// Mixed: "a达" = 1 + 2 = 3 cells.
+	if got := Width("a达"); got != 3 {
+		t.Errorf("Width(\"a达\") = %d, want 3", got)
+	}
+}
+
+// TestWidthStripsANSI pins that SGR escape sequences do not add to the width, so
+// a colored string aligns the same as its plain form.
+func TestWidthStripsANSI(t *testing.T) {
+	plain := "error"
+	colored := Cyan + plain + Reset
+	if got, want := Width(colored), Width(plain); got != want {
+		t.Errorf("Width(colored) = %d, want %d (ANSI must not count)", got, want)
+	}
+}