Add tab char lint check and exclude imported dependencies

contrib/devtools/lint-whitespace.sh

@@ -8,40 +8,81 @@
 
 # We can't run this check unless we know the commit range for the PR.
 if [ -z "${TRAVIS_COMMIT_RANGE}" ]; then
-  exit 0
+  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 "${TRAVIS_COMMIT_RANGE}" --; then
+  if ! git diff -U0 "${TRAVIS_COMMIT_RANGE}" -- "." ":(exclude)src/leveldb/" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/"; then
     echo "Failed to get a diff"
     exit 1
   fi
 }
 
-# Do a first pass, and if no trailing whitespace was found then exit early.
-if ! showdiff | grep -E -q '^\+.*\s+$'; then
-  exit
+showcodediff() {
+  if ! git diff -U0 "${TRAVIS_COMMIT_RANGE}" -- *.cpp *.h *.md *.py *.sh ":(exclude)src/leveldb/" ":(exclude)src/secp256k1/" ":(exclude)src/univalue/"; 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 "$line"
     fi
-done < <(showdiff | grep -E '^(diff --git |\+.*\s+$)')
-exit 1
+  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