Fix Swift call extraction: 0 CALLS edges (#43)

Swift tree-sitter grammar uses positional children (not named fields) for
call_expression, so extract_callee_name() returned NULL for every call.

- extract_calls.c: Swift-specific callee extraction via first named child
  for call_expression and constructor_expression nodes
- lang_specs.c: add constructor_expression to swift_call_types
- 4 new C tests: simple calls, method calls, constructors, chained calls

Co-Authored-By: Jay Sync <63868998+jay-sync@users.noreply.github.com>

internal/cbm/extract_calls.c

@@ -215,6 +215,23 @@ static char *extract_callee_name(CBMArena *a, TSNode node, const char *source, C
         return NULL;
     }
 
+    // Swift: call_expression has no "function" field — callee is first named child.
+    // Also handle constructor_expression for MyClass() syntax.
+    if (lang == CBM_LANG_SWIFT) {
+        const char *nk = ts_node_type(node);
+        if (strcmp(nk, "call_expression") == 0 || strcmp(nk, "constructor_expression") == 0) {
+            if (ts_node_named_child_count(node) > 0) {
+                TSNode callee = ts_node_named_child(node, 0);
+                const char *ck = ts_node_type(callee);
+                if (strcmp(ck, "simple_identifier") == 0 ||
+                    strcmp(ck, "navigation_expression") == 0) {
+                    return cbm_node_text(a, callee, source);
+                }
+            }
+        }
+        return NULL;
+    }
+
     // Generic fallback: first child
     if (ts_node_child_count(node) > 0) {
         TSNode first = ts_node_child(node, 0);

internal/cbm/lang_specs.c

@@ -377,7 +377,7 @@ static const char *swift_class_types[] = {"class_declaration", "protocol_declara
                                           "struct_declaration", "enum_declaration", NULL};
 static const char *swift_field_types[] = {"property_declaration", NULL};
 static const char *swift_module_types[] = {"source_file", NULL};
-static const char *swift_call_types[] = {"call_expression", NULL};
+static const char *swift_call_types[] = {"call_expression", "constructor_expression", NULL};
 static const char *swift_import_types[] = {"import_declaration", NULL};
 static const char *swift_branch_types[] = {"if_statement",    "guard_statement",  "for_statement",
                                            "while_statement", "switch_statement", NULL};

src/cli/cli.c

@@ -1290,22 +1290,40 @@ int cbm_remove_antigravity_mcp(const char *config_path) {
 
 /* ── Claude Code pre-tool hooks ───────────────────────────────── */
 
-#define CMM_HOOK_MATCHER "Grep|Glob|Read"
+#define CMM_HOOK_MATCHER "Grep|Glob|Read|Search"
 #define CMM_HOOK_COMMAND                                                        \
     "echo 'Reminder: prefer codebase-memory-mcp search_graph/trace_call_path/"  \
-    "get_code_snippet over Grep/Glob/Read for code discovery. "                 \
+    "get_code_snippet over Grep/Glob/Read/Search for code discovery. "          \
     "Use get_code_snippet(qualified_name) instead of Read to view a function. " \
     "Fall back only if MCP returns insufficient results.' >&2"
 
-/* Check if a PreToolUse array entry matches our hook (by matcher string) */
+/* Old matcher values from previous versions — recognized during upgrade so
+ * upsert_hooks_json can remove them before inserting the current matcher. */
+static const char *cmm_old_matchers[] = {
+    "Grep|Glob|Read",
+    NULL,
+};
+
+/* Check if a PreToolUse array entry matches our hook (current or old matcher). */
 static bool is_cmm_hook_entry(yyjson_mut_val *entry, const char *matcher_str) {
     yyjson_mut_val *matcher = yyjson_mut_obj_get(entry, "matcher");
     if (!matcher || !yyjson_mut_is_str(matcher)) {
         return false;
     }
     const char *val = yyjson_mut_get_str(matcher);
-    // NOLINTNEXTLINE(readability-implicit-bool-conversion)
-    return val != NULL && strcmp(val, matcher_str) == 0;
+    if (!val) {
+        return false;
+    }
+    if (strcmp(val, matcher_str) == 0) {
+        return true;
+    }
+    /* Also match old versions for backwards-compatible upgrade */
+    for (int i = 0; cmm_old_matchers[i]; i++) {
+        if (strcmp(val, cmm_old_matchers[i]) == 0) {
+            return true;
+        }
+    }
+    return false;
 }
 
 /* Generic hook upsert for both Claude Code and Gemini CLI */

tests/test_extraction.c

@@ -742,6 +742,47 @@ TEST(swift_struct) {
     PASS();
 }
 
+/* --- Swift calls (port of PR #47 Go tests) --- */
+TEST(swift_simple_call) {
+    CBMFileResult *r = extract("func main() { greet() }\nfunc greet() { print(\"hello\") }\n",
+                               CBM_LANG_SWIFT, "t", "main.swift");
+    ASSERT_NOT_NULL(r);
+    ASSERT_FALSE(r->has_error);
+    ASSERT(has_call(r, "greet"));
+    cbm_free_result(r);
+    PASS();
+}
+
+TEST(swift_method_call) {
+    CBMFileResult *r = extract("class Foo {\n    func bar() { baz.run() }\n}\n", CBM_LANG_SWIFT,
+                               "t", "Foo.swift");
+    ASSERT_NOT_NULL(r);
+    ASSERT_FALSE(r->has_error);
+    ASSERT(has_call(r, "baz.run"));
+    cbm_free_result(r);
+    PASS();
+}
+
+TEST(swift_constructor_call) {
+    CBMFileResult *r =
+        extract("func create() { let x = MyClass() }\n", CBM_LANG_SWIFT, "t", "create.swift");
+    ASSERT_NOT_NULL(r);
+    ASSERT_FALSE(r->has_error);
+    ASSERT(has_call(r, "MyClass"));
+    cbm_free_result(r);
+    PASS();
+}
+
+TEST(swift_chained_call) {
+    CBMFileResult *r = extract("func setup() { AlarmScheduler.shared.startKeepAlive() }\n",
+                               CBM_LANG_SWIFT, "t", "setup.swift");
+    ASSERT_NOT_NULL(r);
+    ASSERT_FALSE(r->has_error);
+    ASSERT(r->calls.count > 0);
+    cbm_free_result(r);
+    PASS();
+}
+
 /* --- Objective-C --- */
 TEST(objc_interface) {
     CBMFileResult *r =
@@ -2071,6 +2112,10 @@ SUITE(extraction) {
 
     /* OOP/Systems variants */
     RUN_TEST(swift_struct);
+    RUN_TEST(swift_simple_call);
+    RUN_TEST(swift_method_call);
+    RUN_TEST(swift_constructor_call);
+    RUN_TEST(swift_chained_call);
     RUN_TEST(objc_interface);
     RUN_TEST(objc_implementation);
     RUN_TEST(dart_top_level_function);