Replace func/struct/enum with unified show command

- Add 'show' command to display code for functions/structs/enums by name
- Remove separate func/struct/enum commands
- Update usage message and docstring
- Command format: c_util show name1 name2 ...

c_util

@@ -4,9 +4,7 @@ c_util - C code navigation utility
 Commands:
   toc                     - Show table of contents for all files
   description <names...>  - Show selected items with comments
-  func <file> <name>      - Show function code
-  struct <file> <name>    - Show struct definition
-  enum <file> <name>      - Show enum definition
+  show <name1> [name2]    - Show code for functions/structs/enums
 """
 
 import sys
@@ -659,7 +657,7 @@ def get_function_comments(pre_lines):
 
 def main():
     if len(sys.argv) < 2:
-        print("Usage: c_util toc | description <name1> [name2] ... | func <file> <funcname> | struct <file> <structname> | enum <file> <enumname>")
+        print("Usage: c_util toc | description <name1> [name2] ... | show <name1> [name2] ...")
         sys.exit(1)
     
     cmd = sys.argv[1]
@@ -784,65 +782,66 @@ def main():
                     # struct or enum - print with preserved formatting on multiple lines
                     print(f"[{start + 1}-{end + 1}] {extra}")
     
-    elif cmd == 'func':
-        if len(sys.argv) < 4:
-            print("Usage: c_util func <file> <funcname>")
-            sys.exit(1)
-        
-        file = sys.argv[2]
-        funcname = sys.argv[3]
-        
-        if file in project_functions:
-            for func in project_functions[file]:
-                if func['name'] == funcname:
-                    lines = contents[file]
-                    pre = func['pre']
-                    body = lines[func['start']:func['end'] + 1]
-                    print('\n'.join(pre + body))
-                    sys.exit(0)
-        
-        print("Function not found")
-        sys.exit(1)
-    
-    elif cmd == 'struct':
-        if len(sys.argv) < 4:
-            print("Usage: c_util struct <file> <structname>")
+    elif cmd == 'show':
+        if len(sys.argv) < 3:
+            print("Usage: c_util show <name1> [name2] ...")
             sys.exit(1)
         
-        file = sys.argv[2]
-        structname = sys.argv[3]
-        
-        if file in project_structs:
-            for s in project_structs[file]:
-                if s['name'] == structname:
-                    lines = contents[file]
-                    pre = s['pre']
-                    body = lines[s['start']:s['end'] + 1]
-                    print('\n'.join(pre + body))
-                    sys.exit(0)
+        target_names = set(sys.argv[2:])
+        first_file = True
+        found_any = False
         
-        print("Struct not found")
-        sys.exit(1)
-    
-    elif cmd == 'enum':
-        if len(sys.argv) < 4:
-            print("Usage: c_util enum <file> <enumname>")
+        for f in files:
+            if f not in contents:
+                continue
+            
+            # Collect all matching items
+            items = []
+            
+            # Check functions
+            for func in project_functions.get(f, []):
+                if func['name'] in target_names:
+                    items.append(('function', func))
+                    found_any = True
+            
+            # Check structs
+            for s in project_structs.get(f, []):
+                if s['name'] in target_names:
+                    items.append(('struct', s))
+                    found_any = True
+            
+            # Check enums
+            for e in project_enums.get(f, []):
+                if e['name'] in target_names:
+                    items.append(('enum', e))
+                    found_any = True
+            
+            if not items:
+                continue
+            
+            # Sort by line number
+            items.sort(key=lambda x: x[1]['start'])
+            
+            # Print empty line between files (except before first)
+            if not first_file:
+                print()
+            first_file = False
+            
+            # Print filename header
+            print(f"{f}:")
+            
+            # Print items
+            for item_type, item in items:
+                lines = contents[f]
+                pre = item['pre']
+                body = lines[item['start']:item['end'] + 1]
+                if pre:
+                    print('\n'.join(pre))
+                print('\n'.join(body))
+        
+        if not found_any:
+            print("Not found")
             sys.exit(1)
-        
-        file = sys.argv[2]
-        enumname = sys.argv[3]
-        
-        if file in project_enums:
-            for e in project_enums[file]:
-                if e['name'] == enumname:
-                    lines = contents[file]
-                    pre = e['pre']
-                    body = lines[e['start']:e['end'] + 1]
-                    print('\n'.join(pre + body))
-                    sys.exit(0)
-        
-        print("Enum not found")
-        sys.exit(1)
     
     else:
         print("Unknown command")