Add more formatting checks of this repository's files

- Files starting with a blank line
- Non-Unix line endings
- Blank lines at end of file
- Some minor formatting improvements to the previous checks

Author: per1234

.travis.yml

@@ -43,12 +43,19 @@ before_install:
   # Check for issues in the script
   - bash -c 'shopt -s globstar; shellcheck arduino-ci-script.sh'
 
-  # Check for trailing whitespace in all files in the repository
-  - "if grep --line-number --recursive --exclude-dir=.git '[[:blank:]]$' .; then echo 'Trailing whitespace found.'; false; fi"
-  # Check for tabs in all files in the repository
-  - "if grep --line-number --recursive --exclude-dir=.git $'\t' .; then echo 'Tab found.'; false; fi"
-  # Check if all files in the repository end in a newline (https://stackoverflow.com/a/25686825)
-  - find . -path ./.git -prune -o -type f -print0 | xargs -0 -L1 bash -c 'if test "$(tail --bytes=1 "$0")"; then echo "No new line at end of $0"; false; fi'
+  # Formatting checks:
+  # Check for files starting with a blank line
+  - find . -path ./.git -prune -o -type f -print0 | xargs -0 -L1 bash -c 'head -1 "$0" | grep --regexp="^$"; if [[ "$?" == "0" ]]; then echo "Blank line found at start of $0."; false; fi'
+  # Check for tabs
+  - "if grep --line-number --recursive --exclude-dir=.git --regexp=$'\t' .; then echo 'Tab found.'; false; fi"
+  # Check for trailing whitespace
+  - "if grep --line-number --recursive --binary-files=without-match --exclude-dir=.git --regexp='[[:blank:]]$' .; then echo 'Trailing whitespace found.'; false; fi"
+  # Check for non-Unix line endings
+  - "if grep --files-with-matches --recursive --binary-files=without-match --exclude-dir=.git --regexp=$'\r$' .; then echo 'Non-Unix EOL detected.'; false; fi"
+  # Check for blank lines at end of files
+  - find . -path ./.git -prune -o -type f -print0 | xargs -0 -L1 bash -c 'tail -1 "$0" | grep --regexp="^$"; if [[ "$?" == "0" ]]; then echo "Blank line found at end of $0."; false; fi'
+  # Check for files that don't end in a newline (https://stackoverflow.com/a/25686825)
+  - find . -path ./.git -prune -o -type f -print0 | xargs -0 -L1 bash -c 'if test "$(tail --bytes=1 "$0")"; then echo "No new line at end of $0."; false; fi'
 
   - source "${TRAVIS_BUILD_DIR}/arduino-ci-script.sh"
 

LICENSE

@@ -19,4 +19,3 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
-