Initial commit: it compiles?

model/section.go

@@ -0,0 +1,30 @@
+package model
+
+import "math/rand"
+
+func (m Model) randomizeSection(s int) Model {
+	m = m.clearSection(s)
+	for y := 0; y < m.section; y++ {
+		for x := 0; x < m.section; x++ {
+			cell := ((s/m.section)*m.size + y) + ((s%m.size)*m.section + x)
+			if rand.Int()%2 == 1 {
+				m.field |= cell
+			}
+		}
+	}
+	return m
+}
+
+func (m Model) clearSection(s int) Model {
+	m.sections = m.sections &^ s
+	for y := 0; y < m.section; y++ {
+		for x := 0; x < m.section; x++ {
+			cell := ((s/m.section)*m.size + y) + ((s%m.size)*m.section + x)
+			m.field = m.field &^ cell
+			m.marks = m.marks &^ cell
+			m.flags = m.flags &^ cell
+			m.correct = m.correct &^ cell
+		}
+	}
+	return m
+}