prioritize function token for inspection

    foo(a=str.|

will find `foo` instead of `str`

IPython/utils/tests/test_tokenutil.py

@@ -48,13 +48,28 b' def test_multiline():'
     start = cell.index(expected) + 1
     for i in range(start, start + len(expected)):
         expect_token(expected, cell, i)
-    expected = 'there'
+    expected = 'hello'
     start = cell.index(expected) + 1
     for i in range(start, start + len(expected)):
         expect_token(expected, cell, i)
 
+def test_nested_call():
+    cell = "foo(bar(a=5), b=10)"
+    expected = 'foo'
+    start = cell.index('bar') + 1
+    for i in range(start, start + 3):
+        expect_token(expected, cell, i)
+    expected = 'bar'
+    start = cell.index('a=')
+    for i in range(start, start + 3):
+        expect_token(expected, cell, i)
+    expected = 'foo'
+    start = cell.index(')') + 1
+    for i in range(start, len(cell)-1):
+        expect_token(expected, cell, i)
+
 def test_attrs():
-    cell = "foo(a=obj.attr.subattr)"
+    cell = "a = obj.attr.subattr"
     expected = 'obj'
     idx = cell.find('obj') + 1
     for i in range(idx, idx + 3):

IPython/utils/tokenutil.py

@@ -58,6 +58,9 b' def token_at_cursor(cell, cursor_pos=0):'
     
     Used for introspection.
     
+    Function calls are prioritized, so the token for the callable will be returned
+    if the cursor is anywhere inside the call.
+    
     Parameters
     ----------
     
@@ -70,6 +73,7 b' def token_at_cursor(cell, cursor_pos=0):'
     names = []
     tokens = []
     offset = 0
+    call_names = []
     for tup in generate_tokens(StringIO(cell).readline):
         
         tok = Token(*tup)
@@ -93,6 +97,11 b' def token_at_cursor(cell, cursor_pos=0):'
             if tok.text == '=' and names:
                 # don't inspect the lhs of an assignment
                 names.pop(-1)
+            if tok.text == '(' and names:
+                # if we are inside a function call, inspect the function
+                call_names.append(names[-1])
+            elif tok.text == ')' and call_names:
+                call_names.pop(-1)
         
         if offset + end_col > cursor_pos:
             # we found the cursor, stop reading
@@ -102,7 +111,9 b' def token_at_cursor(cell, cursor_pos=0):'
         if tok.token == tokenize2.NEWLINE:
             offset += len(tok.line)
     
-    if names:
+    if call_names:
+        return call_names[-1]
+    elif names:
         return names[-1]
     else:
         return ''