fix #94 Dropped/Sold items can't be removed from HUD (#95)

tl;dr copy-paste considered harmful. Dijkstra is alleged to have
provided that title for the essay, I have read. He was a real
trickster figure.

Plus, some efficiency tweaks for this code path. Added some
comments explaining the problem with knowing when to advance
a cycle in the drop/sell case.

justfile

@@ -3,7 +3,7 @@ set shell := ["bash", "-uc"]
 set dotenv-load := true
 
 SPRIGGIT := "~/bin/spriggit"
-TESTMOD := "/mnt/g/MO2Skyrim/SoulsyHUD fomod test/"
+TESTMOD := "/mnt/g/MO2Skyrim/Soulsy HUD dev version"
 
 # List available recipes.
 help:

src/controller/control.rs

@@ -226,25 +226,33 @@ impl Controller {
                 }
             }
         } else {
+            // This entire code block is unlikely to execute because we are
+            // consistently getting the unequip message first. Unfortunately
+            // we have no idea at that time *why* the unequip event happened.
             if let Some(candidate) = self.visible.get_mut(&HudElement::Left) {
                 if candidate.form_string() == *form_spec {
                     candidate.set_count(new_count);
+                    if new_count == 0 {
+                        self.advance_hand_cycle(&CycleSlot::Left);
+                    }
                 }
             }
             if let Some(candidate) = self.visible.get_mut(&HudElement::Right) {
                 if candidate.form_string() == *form_spec {
                     candidate.set_count(new_count);
+                    if new_count == 0 {
+                        self.advance_hand_cycle(&CycleSlot::Right);
+                    }
                 }
             }
         }
-
-        self.cycles
-            .remove_zero_count_items(form_spec.as_str(), &kind, new_count);
-
         if new_count > 0 {
             return;
         }
 
+        self.cycles
+            .remove_zero_count_items(form_spec.as_str(), &kind);
+
         // The count of the inventory item went to zero. We need to check
         // if we must equip/ready something else now.
 

src/controller/cycleentries.rs

@@ -458,4 +458,22 @@ mod tests {
         let id = cycle.find_next_id();
         assert_eq!(id, 1);
     }
+
+    #[test]
+    fn filtering() {
+        use crate::data::item_cache::ItemCache;
+        let mut cache = ItemCache::new();
+        let mut cycle = Vec::<String>::new();
+
+        let item = cache.get(&"form-one".to_string());
+        assert!(cycle.add(&item.form_string()));
+        let item2 = cache.get(&"form-two".to_string());
+        assert!(cycle.add(&item2.form_string()));
+        let item3 = cache.get(&"form-three".to_string());
+        cycle.add(&item3.form_string());
+        assert_eq!(cycle.len(), 3);
+
+        assert!(cycle.filter_id(&"form-two"));
+        assert_eq!(cycle.len(), 2);
+    }
 }

src/controller/cycles.rs

@@ -190,21 +190,16 @@ impl CycleData {
         }
     }
 
-    pub fn remove_zero_count_items(&mut self, form_spec: &str, kind: &BaseType, count: u32) {
-        // If count is zero, remove from any cycles it's in.
-        // If count is zero and item is equipped, advance the relevant cycle. <-- not happening erk
-        if count > 0 {
-            return;
-        }
-
+    pub fn remove_zero_count_items(&mut self, form_spec: &str, kind: &BaseType) {
         if kind.is_utility() {
             self.utility.filter_id(form_spec);
+            return;
         }
         if kind.left_hand_ok() {
-            self.utility.filter_id(form_spec);
+            self.left.filter_id(form_spec);
         }
         if kind.right_hand_ok() {
-            self.utility.filter_id(form_spec);
+            self.right.filter_id(form_spec);
         }
     }