Add a necessary skills tab to ship skills

gui/builtinItemStatsViews/itemSkills.py

@@ -41,6 +41,7 @@ class ItemSkills(wx.Panel):
             ("Cargo", "cargo"),
             ("Implants", "appliedImplants"),
             ("Boosters", "boosters"),
+            ("Necessary", "necessary"),
         ]
 
         for label, key in components:
@@ -123,6 +124,9 @@ class ItemSkills(wx.Panel):
 
         for thing in items:
             self._collectAffectingSkills(thing, char, skillsMap)
+        
+        if self.checkboxes["necessary"].GetValue():
+            self._collectRequiredSkills(items, char, skillsMap)
 
         skillsList = ""
         for skillName in sorted(skillsMap):
@@ -158,6 +162,7 @@ class ItemSkills(wx.Panel):
         self.checkboxes["cargo"].Enable(len(fit.cargo) > 0)
         self.checkboxes["appliedImplants"].Enable(len(fit.appliedImplants) > 0)
         self.checkboxes["boosters"].Enable(len(fit.boosters) > 0)
+        self.checkboxes["necessary"].Enable(True)
 
     def _collectAffectingSkills(self, thing, char, skillsMap):
         for attr in ("item", "charge"):
@@ -184,3 +189,32 @@ class ItemSkills(wx.Panel):
                                     skillsMap[skillName] = afflictor.level
                                 elif skillsMap[skillName] < afflictor.level:
                                     skillsMap[skillName] = afflictor.level
+    
+    def _collectRequiredSkills(self, items, char, skillsMap):
+        """Collect required skills from items (necessary to use them)"""
+        for thing in items:
+            for attr in ("item", "charge"):
+                if attr == "charge" and isinstance(thing, es_Fighter):
+                    continue
+                subThing = getattr(thing, attr, None)
+                if subThing is None:
+                    continue
+                if isinstance(thing, es_Fighter) and attr == "charge":
+                    continue
+                
+                if hasattr(subThing, "requiredSkills"):
+                    for reqSkill, level in subThing.requiredSkills.items():
+                        skillName = reqSkill.name
+                        charSkill = char.getSkill(reqSkill) if char else None
+                        charLevel = charSkill.level if charSkill else 0
+                        
+                        if charLevel > 0:
+                            if skillName not in skillsMap:
+                                skillsMap[skillName] = charLevel
+                            elif skillsMap[skillName] < charLevel:
+                                skillsMap[skillName] = charLevel
+                        else:
+                            if skillName not in skillsMap:
+                                skillsMap[skillName] = level
+                            elif skillsMap[skillName] < level:
+                                skillsMap[skillName] = level