From de8ca92755ecbb9722ba9bbb42a05a9f2d4dd20b Mon Sep 17 00:00:00 2001
From: nisse <nisse@webrtc.org>
Date: Mon, 23 Jan 2017 02:41:08 -0800
Subject: [PATCH] New script to count usage of C++ classes.

This script is similar to header_usage.sh, but it counts usage (number
of files) of each class defined in some header file.

E.g., the following classes appear unused,

  AsyncHttpsProxyServerSocket
  CompositeMediaEngineWithFakeVoiceEngine
  DesktopId
  RtpDataCallback
  ScopedMessageData
  ScreencastEventCatcher

NOTRY=true
BUG=None

Review-Url: https://codereview.webrtc.org/2649103002
Cr-Commit-Position: refs/heads/master@{#16204}
---
 webrtc/tools/class_usage.sh | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100755 webrtc/tools/class_usage.sh

diff --git a/webrtc/tools/class_usage.sh b/webrtc/tools/class_usage.sh
new file mode 100755
index 0000000000..02b80c2599
--- /dev/null
+++ b/webrtc/tools/class_usage.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+# This script is run in a git repository. It lists all classes defined
+# in header files, sorted by the number of other files where the name
+# of the class occurs. It is intentionally not limited to only source
+# files. Classes close to the top of the list are candidates for
+# removal.
+
+git grep -h '^class .*[:{]' -- '*.h' '*.hpp' \
+  | sed -e 's/WEBRTC_DLL_EXPORT// ' -e 's/^class *\([^ :{(<]*\).*/\1/' \
+  | sort | uniq | while read class ; do
+  count="$(git grep -l -w -F "${class}" | wc -l)"
+  echo "${count}" "${class}"
+done | sort -n