diff --git a/src/ldo.c b/src/ldo.c
index fa74f34..2abd935 100644
--- a/src/ldo.c
+++ b/src/ldo.c
@@ -283,27 +283,7 @@ void record_depth_of_global_function (lua_State *L, CallInfo *ci) {
     return;
   int g = GETARG_Bx(i);  /* global index */
   lua_assert(ttisstring(&p->k[g]));
-  const char *name = svalue(&p->k[g]);
-  int depth = ci - L->base_ci;
-  /* Maintain a global table mapping from function name to call-stack depth
-   * at first call to it.
-   *
-   * Won't be perfect; might get confused by shadowing locals. But we can't
-   * be perfect without a bidirectional mapping between interpreter state
-   * and source code. Which would make Lua either a lot less dynamic or a
-   * a lot more like Smalltalk. */
-  // push table
-  luaL_newmetatable(L, "__teliva_call_graph_depth");
-  int cgt = lua_gettop(L);
-  // if key doesn't already exist, set it
-  lua_getfield(L, cgt, name);
-  if (lua_isnil(L, -1)) {
-    lua_pushinteger(L, depth);
-    lua_setfield(L, cgt, name);
-  }
-  // clean up
-  lua_pop(L, 1);  // key
-  lua_pop(L, 1);  // table
+  assign_call_graph_depth_to_name(L, ci - L->base_ci, svalue(&p->k[g]));
 }
 
 
diff --git a/src/teliva.c b/src/teliva.c
index 5ef3325..777648b 100644
--- a/src/teliva.c
+++ b/src/teliva.c
@@ -254,6 +254,28 @@ void draw_highlighted_definition_name(const char* definition_name) {
   addstr("  ");
 }
 
+void assign_call_graph_depth_to_name(lua_State* L, int depth, const char* name) {
+  /* Maintain a global table mapping from function name to call-stack depth
+   * at first call to it.
+   *
+   * Won't be perfect; might get confused by shadowing locals. But we can't
+   * be perfect without a bidirectional mapping between interpreter state
+   * and source code. Which would make Lua either a lot less dynamic or a
+   * a lot more like Smalltalk. */
+  // push table
+  luaL_newmetatable(L, "__teliva_call_graph_depth");
+  int cgt = lua_gettop(L);
+  // if key doesn't already exist, set it
+  lua_getfield(L, cgt, name);
+  if (lua_isnil(L, -1)) {
+    lua_pushinteger(L, depth);
+    lua_setfield(L, cgt, name);
+  }
+  // clean up
+  lua_pop(L, 1);  // key
+  lua_pop(L, 1);  // table
+}
+
 /* return true if submitted */
 static int edit_current_definition(lua_State* L);
 static void recent_changes_view(lua_State* L);
diff --git a/src/teliva.h b/src/teliva.h
index bf75bc9..f783eec 100644
--- a/src/teliva.h
+++ b/src/teliva.h
@@ -162,6 +162,7 @@ extern int load_editor_buffer_to_current_definition_in_image(lua_State* L);
 extern void save_to_current_definition_and_editor_buffer(lua_State* L, const char* definition);
 extern void save_editor_state(int rowoff, int coloff, int cy, int cx);
 
+extern void assign_call_graph_depth_to_name(lua_State* L, int depth, const char* name);
 extern void append_to_audit_log(lua_State* L, const char* buffer);
 
 /* Standard UI elements */