Split run_tool.py into run_tool.py, extract_edits.py and apply_edits.py

tools/clang/scripts/extract_edits.py

Index: tools/clang/scripts/extract_edits.py
diff --git a/tools/clang/scripts/extract_edits.py b/tools/clang/scripts/extract_edits.py
new file mode 100755
index 0000000000000000000000000000000000000000..b0df9c3541d90f985ce0bbd8d07c04b25a1aa1f8
--- /dev/null
+++ b/tools/clang/scripts/extract_edits.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+# Copyright (c) 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Script to extract edits from clang tool output.
+
+If a clang tool emits edits, then the edits should look like this:
+    ...
+    ==== BEGIN EDITS ====
+    <edit1>
+    <edit2>
+    ...
+    ==== END EDITS ====
+    ...
+
+extract_edits.py takes input that is concatenated from multiple tool invocations
+and extract just the edits.  In other words, given the following input:
+    ...
+    ==== BEGIN EDITS ====
+    <edit1>
+    <edit2>
+    ==== END EDITS ====
+    ...
+    ==== BEGIN EDITS ====
+    <yet another edit1>
+    <yet another edit2>
+    ==== END EDITS ====
+    ...
+extract_edits.py would emit the following output:
+    <edit1>
+    <edit2>
+    <yet another edit1>
+    <yet another edit2>
+
+This python script is mainly needed on Windows.
+On unix this script can be replaced with running sed as follows:
+
+    $ cat run_tool.debug.out \
+        | sed '/^==== BEGIN EDITS ====$/,/^==== END EDITS ====$/{//!b};d'
+        | sort | uniq
+"""
+
+
+import sys
+
+
+def main():
+  unique_lines = set()
+  inside_marker_lines = False
+  for line in sys.stdin:
+    line = line.rstrip("\n\r")
+    if line == '==== BEGIN EDITS ====':
+      inside_marker_lines = True
+      continue
+    if line == '==== END EDITS ====':
+      inside_marker_lines = False
+      continue
+    if inside_marker_lines and line not in unique_lines:
+      unique_lines.add(line)
+      print line
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())