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}
diff --git a/webrtc/tools/class_usage.sh b/webrtc/tools/class_usage.sh
new file mode 100755
index 0000000..02b80c2
--- /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