1 files changed, 88 insertions, 0 deletions
diff --git a/contrib/devtools/lint-whitespace.sh b/contrib/devtools/lint-whitespace.sh
new file mode 100755
index 0000000000..989923f31a
--- /dev/null
+++ b/contrib/devtools/lint-whitespace.sh
@@ -0,0 +1,88 @@
+#!/bin/bash
+#
+# Copyright (c) 2017 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# Check for new lines in diff that introduce trailing whitespace.
+
+# We can't run this check unless we know the commit range for the PR.
+if [ -z "${TRAVIS_COMMIT_RANGE}" ]; then
+  echo "Cannot run lint-whitespace.sh without commit range. To run locally, use:"
+  echo "TRAVIS_COMMIT_RANGE='<commit range>' .lint-whitespace.sh"
+  echo "For example:"
+  echo "TRAVIS_COMMIT_RANGE='47ba2c3...ee50c9e' .lint-whitespace.sh"
+  exit 1
+fi
+
+showdiff() {
+  if ! git diff -U0 "${TRAVIS_COMMIT_RANGE}" -- "." ":(exclude)src/leveldb/" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/" ":(exclude)doc/release-notes/"; then
+    echo "Failed to get a diff"
+    exit 1
+  fi
+}
+
+showcodediff() {
+  if ! git diff -U0 "${TRAVIS_COMMIT_RANGE}" -- *.cpp *.h *.md *.py *.sh ":(exclude)src/leveldb/" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/" ":(exclude)doc/release-notes/"; then
+    echo "Failed to get a diff"
+    exit 1
+  fi
+}
+
+RET=0
+
+# Check if trailing whitespace was found in the diff.
+if showdiff | grep -E -q '^\+.*\s+$'; then
+  echo "This diff appears to have added new lines with trailing whitespace."
+  echo "The following changes were suspected:"
+  FILENAME=""
+  SEEN=0
+  while read -r line; do
+    if [[ "$line" =~ ^diff ]]; then
+      FILENAME="$line"
+      SEEN=0
+    elif [[ "$line" =~ ^@@ ]]; then
+      LINENUMBER="$line"
+    else
+      if [ "$SEEN" -eq 0 ]; then
+        # The first time a file is seen with trailing whitespace, we print the
+        # filename (preceded by a newline).
+        echo
+        echo "$FILENAME"
+        echo "$LINENUMBER"
+        SEEN=1
+      fi
+      echo "$line"
+    fi
+  done < <(showdiff | grep -E '^(diff --git |@@|\+.*\s+$)')
+  RET=1
+fi
+
+# Check if tab characters were found in the diff.
+if showcodediff | grep -P -q '^\+.*\t'; then
+  echo "This diff appears to have added new lines with tab characters instead of spaces."
+  echo "The following changes were suspected:"
+  FILENAME=""
+  SEEN=0
+  while read -r line; do
+    if [[ "$line" =~ ^diff ]]; then
+      FILENAME="$line"
+      SEEN=0
+    elif [[ "$line" =~ ^@@ ]]; then
+      LINENUMBER="$line"
+    else
+      if [ "$SEEN" -eq 0 ]; then
+        # The first time a file is seen with a tab character, we print the
+        # filename (preceded by a newline).
+        echo
+        echo "$FILENAME"
+        echo "$LINENUMBER"
+        SEEN=1
+      fi
+      echo "$line"
+    fi
+  done < <(showcodediff | grep -P '^(diff --git |@@|\+.*\t)')
+  RET=1
+fi
+
+exit $RET