Fix references

example/main.typ

@@ -142,17 +142,17 @@ Lists are useful to present information in a concise and/or ordered way.
 == Ligatures 
 fi fj fl ffl ffi Ty
 
-== Referencing Chapters
+== Referencing Chapters<heading1>
 #index("Referencing")
-This statement references to another chapter @chap1
+This statement references to another chapter @chap1. This statement references to another heading @heading1. This statement references to another heading @heading2.
 
 #part("Part Two Title")
 
 #chapter("Mathematics", image: image("./orange2.jpg"))
 
 == Theorems
 #index("Theorems")
-=== Several equations
+=== Several equations<heading2>
 #index("Theorems!Several equations")
 This is a theorem consisting of several equations.
 #theorem(name: "Name of the theorem")[

lib.typ

@@ -399,10 +399,24 @@
         }
         return place(dx:-4.5cm, box(width: 4cm, align(right, text(fill: color)[#nums.pos().map(str).join(".")])))
       }
-    },
-    supplement: supplement-chapter
+    }
   );
 
+  show heading.where(level: 1): set heading(supplement: supplement-chapter)
+
+  show ref: it => {
+    let eq = heading
+    let el = it.element
+    // let numberingFormat = if appendix-state != none {"A.1"} else {"1.1"}  //appendix state must be sourced somehow 
+    let numberingFormat = {"1.1"}
+    if el != none and el.func() == eq {
+      let arrayEq = counter(eq).at(el.location())
+      [#el.supplement #numbering(numberingFormat, ..arrayEq) ]
+    } else {
+      it
+    }
+  }
+
   show heading: it => {
     set text(size: font-size)
     if it.level == 1 {

tests/sample-book/test.typ

@@ -142,17 +142,17 @@ Lists are useful to present information in a concise and/or ordered way.
 == Ligatures 
 fi fj fl ffl ffi Ty
 
-== Referencing Chapters
+== Referencing Chapters<heading1>
 #index("Referencing")
-This statement references to another chapter @chap1
+This statement references to another chapter @chap1. This statement references to another heading @heading1. This statement references to another heading @heading2.
 
 #part("Part Two Title")
 
 #chapter("Mathematics", image: image("./orange2.jpg"))
 
 == Theorems
 #index("Theorems")
-=== Several equations
+=== Several equations<heading2>
 #index("Theorems!Several equations")
 This is a theorem consisting of several equations.
 #theorem(name: "Name of the theorem")[