Add detection of new or removed files to reproduce.sh

third_party/polymer/v1_0/reproduce.sh

 #!/bin/bash
 
 # Copyright 2014 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.
 
 # Reproduces the content of 'components' and 'components-chromium' using the
 # list of dependencies from 'bower.json'. Downloads needed packages and makes
 # Chromium specific modifications. To launch the script you need 'bower',
 # 'crisper', and 'vulcanize' installed on your system.
@@ skipping 46 matching lines @@
 # Resolve a unicode encoding issue in dom-innerHTML.html.
 NBSP=$(python -c 'print u"\u00A0".encode("utf-8")')
 sed -i 's/['"$NBSP"']/\\u00A0/g' components/polymer/polymer-mini.html
 
 ./extract_inline_scripts.sh components components-chromium
 
 # Remove import of external resource in font-roboto (fonts.googleapis.com)
 # and apply additional chrome specific patches. NOTE: Where possible create
 # a Polymer issue and/or pull request to minimize these patches.
 patch -p1 < chromium.patch
+
+new=$(git status --porcelain components-chromium | grep '^??' | \
+      cut -d' ' -f2 | egrep '\.(html|js|css)$')
+
+if [[ ! -z "${new}" ]]; then

[dschuyler, 2015/11/21 02:48:48]

nit: I'd have a preference for the build-in test '[' and testing for non-zero: 
e.g.
if [ -n "${new}" ]; then
(same nit for if's below).

[Dan Beam, 2015/11/21 02:56:25]

https://google.github.io/styleguide/shell.xml?showone=Test,_%5B_and_%5B%5B#Te...

+  echo
+  echo 'These files appear to have been added:'
+  echo "${new}" | sed 's/^/  /'
+fi
+
+deleted=$(git status --porcelain components-chromium | grep '^.D' | \
+          cut -d' ' -f3 | egrep '\.(html|js|css)$')
+
+if [[ ! -z "${deleted}" ]]; then
+  echo
+  echo 'These files appear to have been removed:'
+  echo "${deleted}" | sed 's/^/  /'
+fi
+
+if [[ ! -z "${new}${deleted}" ]]; then
+  echo
+fi