Decompose wizard.go createObj and whatis (refactor step 7)

createObj gains createWeaponArmor/createRing; whatis gains whatisPick
for its prompt loop. wizard.go is complexity-clean. Behavior unchanged.

game/wizard.go

@@ -27,6 +27,26 @@ func (g *RogueGame) createObj() {
 
 	switch obj.Kind {
 	case KindWeapon, KindArmor:
+		g.createWeaponArmor(obj)
+	case KindRing:
+		g.createRing(obj)
+	case KindWand:
+		g.fixStick(obj)
+	case KindGold:
+		g.msg("how much?")
+
+		buf := ""
+		if g.getStr(&buf, g.scr.Std) == Norm {
+			obj.GoldValue = cAtoi(buf)
+		}
+	}
+
+	g.addPack(obj, false)
+}
+
+// createWeaponArmor sets up a wizard-created weapon or armor with an
+// optional blessing (the weapon/armor arm of wizard.c create_obj).
+func (g *RogueGame) createWeaponArmor(obj *Object) {
 	g.msg("blessing? (+,-,n)")
 	bless := g.readchar()
 	g.Msgs.Mpos = 0
@@ -45,7 +65,10 @@ func (g *RogueGame) createObj() {
 		if bless == '+' {
 			obj.HPlus += g.rnd(3) + 1
 		}
-		} else {
+
+		return
+	}
+
 	obj.ArmorClass = g.data.aClass[obj.Which]
 	if bless == '-' {
 		obj.ArmorClass += g.rnd(3) + 1
@@ -55,7 +78,10 @@ func (g *RogueGame) createObj() {
 		obj.ArmorClass -= g.rnd(3) + 1
 	}
 }
-	case KindRing:
+
+// createRing sets up a wizard-created ring, prompting for a bonus on
+// the bonus rings (the ring arm of wizard.c create_obj).
+func (g *RogueGame) createRing(obj *Object) {
 	switch obj.RingKind() {
 	case RingProtection, RingAddStrength, RingDexterity, RingIncreaseDamage:
 		g.msg("blessing? (+,-,n)")
@@ -71,18 +97,6 @@ func (g *RogueGame) createObj() {
 	case RingAggravateMonsters, RingTeleportation:
 		obj.Flags.Set(Cursed)
 	}
-	case KindWand:
-		g.fixStick(obj)
-	case KindGold:
-		g.msg("how much?")
-
-		buf := ""
-		if g.getStr(&buf, g.scr.Std) == Norm {
-			obj.GoldValue = cAtoi(buf)
-		}
-	}
-
-	g.addPack(obj, false)
 }
 
 // showMap prints out the whole map for the wizard (wizard.c show_map).
@@ -117,34 +131,8 @@ func (g *RogueGame) whatis(insist bool, kind ObjectKind) {
 		return
 	}
 
-	var obj *Object
+	obj, ok := g.whatisPick(insist, kind)
-	for {
+	if !ok {
-		obj, _ = g.promptPackItem("identify", kind)
-
-		if !insist {
-			break
-		}
-
-		if g.NObjs == 0 {
-			return
-		}
-
-		if obj == nil {
-			g.msg("you must identify something")
-
-			continue
-		}
-
-		if !matchesFilter(kind, obj) {
-			g.msg("you must identify a %s", kind)
-
-			continue
-		}
-
-		break
-	}
-
-	if obj == nil {
 		return
 	}
 
@@ -164,6 +152,37 @@ func (g *RogueGame) whatis(insist bool, kind ObjectKind) {
 	g.msg("%s", g.inventoryName(obj, false))
 }
 
+// whatisPick prompts for the item to identify, re-asking until a
+// matching one is chosen when insist is set; ok is false when the
+// player gives up (the prompt loop of wizard.c whatis).
+func (g *RogueGame) whatisPick(insist bool, kind ObjectKind) (*Object, bool) {
+	for {
+		obj, _ := g.promptPackItem("identify", kind)
+
+		if !insist {
+			return obj, obj != nil
+		}
+
+		if g.NObjs == 0 {
+			return nil, false
+		}
+
+		if obj == nil {
+			g.msg("you must identify something")
+
+			continue
+		}
+
+		if !matchesFilter(kind, obj) {
+			g.msg("you must identify a %s", kind)
+
+			continue
+		}
+
+		return obj, true
+	}
+}
+
 // setKnow sets things up when we really know what a thing is (wizard.c
 // set_know).
 func setKnow(obj *Object, info []ObjInfo) {