1 files changed, 34 insertions, 1 deletions

diff --git a/.travis-build.sh b/.travis-build.sh
index 80361ddaf..b8562cb02 100755
--- a/.travis-build.sh
+++ b/.travis-build.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 set -e
 set -x
@@ -9,6 +9,39 @@ if grep -nr '\s$' src *.yml *.txt *.md Doxyfile .gitignore .gitmodules .travis*
     exit 1
 fi
 
+# Only run clang-format on Linux because we don't have 4.0 on OS X images
+if [ "$TRAVIS_OS_NAME" = "linux" ]; then
+    # Default clang-format points to default 3.5 version one
+    CLANG_FORMAT=clang-format-4.0
+    $CLANG_FORMAT --version
+
+    if [ "$TRAVIS_EVENT_TYPE" = "pull_request" ]; then
+        # Get list of every file modified in this pull request
+        files_to_lint="$(git diff --name-only --diff-filter=ACMRTUXB $TRAVIS_COMMIT_RANGE | grep '^src/[^.]*[.]\(cpp\|h\)$')"
+    else
+        # Check everything for branch pushes
+        files_to_lint="$(find src/ -name '*.cpp' -or -name '*.h')"
+    fi
+
+    # Turn off tracing for this because it's too verbose
+    set +x
+
+    for f in $files_to_lint; do
+        d=$(diff -u "$f" <($CLANG_FORMAT "$f"))
+        if ! [ -z "$d" ]; then
+            echo "!!! $f not compliant to coding style, here is the fix:"
+            echo "$d"
+            fail=1
+        fi
+    done
+
+    set -x
+
+    if [ "$fail" = 1 ]; then
+        exit 1
+    fi
+fi
+
 #if OS is linux or is not set
 if [ "$TRAVIS_OS_NAME" = "linux" -o -z "$TRAVIS_OS_NAME" ]; then
     export CC=gcc-6