Add CI workflow to check line endings of all source files (#2082)

In addition, all found errors (formatting & line ending) have been fixed in this PR.

tools/check-format.sh

@@ -4,12 +4,14 @@ set -eu
 
 fail="0"
 
+clang-format --version
+
 while read -r file; do
     if ! diff -u <(cat "$file") <(clang-format "$file"); then
         echo "$file differs!!!!!!!"
         fail="1"
     fi
-done < <(find src/ \( -iname "*.hpp" -o -iname "*.cpp" \))
+done < <(find src/ -type f \( -iname "*.hpp" -o -iname "*.cpp" \))
 
 if [ "$fail" = "1" ]; then
     echo "At least one file is poorly formatted - check the output above"

tools/check-line-endings.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+set -eu
+
+fail="0"
+
+dos2unix --version
+
+while read -r file; do
+    num_dos_line_endings=$(dos2unix -id "$file" | awk '/[0-9]+/{print $(NF-1)}')
+    if [ "$num_dos_line_endings" -gt "0" ]; then
+        >&2 echo "File '$file' contains $num_dos_line_endings DOS line-endings, it should only be using unix line-endings!"
+        fail="1"
+    fi
+done < <(find src/ -type f \( -iname "*.hpp" -o -iname "*.cpp" \))
+
+if [ "$fail" = "1" ]; then
+    >&2 echo "At least one file is not using unix line-endings - check the output above"
+    exit 1
+fi
+
+>&2 echo "Every file seems to be using unix line-endings. Good job!"