Coding style.

- Tidy up gut tool.

eris/tools.py

@@ -335,7 +335,7 @@ def python_coverage(path):
     return status, _colorize_coverage_report(lines)
 
 
-def _function_body_lines(module_contents):
+def _function_body_lines(python_source):
     ranges = []
     class FuncNodeVisitor(ast.NodeVisitor):
 
@@ -347,28 +347,22 @@ def _function_body_lines(module_contents):
 
         def visit_AsyncFunctionDef(self, node):
             ranges.append(self._line_range(node.body))
-    visitor = FuncNodeVisitor()
-    tree = ast.parse(module_contents)
-    visitor.visit(tree)
+    tree = ast.parse(python_source)
+    FuncNodeVisitor().visit(tree)
     return ranges
 
 
-def _gut_module(module_contents):
-    ranges = _function_body_lines(module_contents)
-    lines = module_contents.splitlines(keepends=True)
-    deleted = 0
-    for start_line, end_line in ranges:
-        del lines[start_line-deleted:end_line-deleted]
-        deleted += (end_line - start_line)
-    return "".join(lines)
-
-
 @deps(url="https://github.com/ahamilton/eris")
 def python_gut(path):
     with open(path) as module_file:
-        output = _gut_module(module_file.read())
-    source_widget = _syntax_highlight_using_path(_fix_input(output), path)
-    return Status.normal, source_widget
+        python_source = module_file.read()
+    lines = python_source.splitlines(keepends=True)
+    deleted = 0
+    for start_line, end_line in _function_body_lines(python_source):
+        del lines[start_line-deleted:end_line-deleted]
+        deleted += (end_line - start_line)
+    gutted_source = "".join(lines)
+    return Status.normal, _syntax_highlight_using_path(gutted_source, path)
 
 
 def _get_mccabe_line_score(line):