Add more static checks and move to separate file to match main repo

misc/scripts/header_guards.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+if [ ! -f "SConstruct" ]; then
+  echo "Warning: This script is intended to be run from the root of the Godot repository."
+  echo "Some of the paths checks may not work as intended from a different folder."
+fi
+
+files_invalid_guard=""
+
+for file in $(find . -name "*.hpp" -print); do
+  # Skip generated files.
+  if [[ "$file" == "./gen/"* || "$file" == "./include/gen/"* ]]; then continue; fi
+  # Skip the test project.
+  if [[ "$file" == "./test/"* ]]; then continue; fi
+
+  bname=$(basename $file .hpp)
+
+  # NOTE: The "GODOT_CPP_" prefix is already used by the generated
+  # bindings, so we can't use that. We'll use "GODOT_" instead.
+  prefix="GODOT_"
+
+  # ^^ is bash builtin for UPPERCASE.
+  guard="${prefix}${bname^^}_HPP"
+
+  # Replaces guards to use computed name.
+  # We also add some \n to make sure there's a proper separation.
+  sed -i $file -e "0,/ifndef/s/#ifndef.*/\n#ifndef $guard/"
+  sed -i $file -e "0,/define/s/#define.*/#define $guard\n/"
+  sed -i $file -e "$ s/#endif.*/\n#endif \/\/ $guard/"
+  # Removes redundant \n added before, if they weren't needed.
+  sed -i $file -e "/^$/N;/^\n$/D"
+
+  # Check that first ifndef (should be header guard) is at the expected position.
+  # If not it can mean we have some code before the guard that should be after.
+  # "31" is the expected line with the copyright header.
+  first_ifndef=$(grep -n -m 1 "ifndef" $file | sed 's/\([0-9]*\).*/\1/')
+  if [[ "$first_ifndef" != "31" ]]; then
+    files_invalid_guard+="$file\n"
+  fi
+done
+
+if [[ ! -z "$files_invalid_guard" ]]; then
+  echo -e "The following files were found to have potentially invalid header guard:\n"
+  echo -e "$files_invalid_guard"
+fi
+
+diff=$(git diff --color)
+
+# If no diff has been generated all is OK, clean up, and exit.
+if [ -z "$diff" ] ; then
+    printf "Files in this commit comply with the header guards formatting rules.\n"
+    exit 0
+fi
+
+# A diff has been created, notify the user, clean up, and exit.
+printf "\n*** The following differences were found between the code "
+printf "and the header guards formatting rules:\n\n"
+echo "$diff"
+printf "\n*** Aborting, please fix your commit(s) with 'git commit --amend' or 'git rebase -i <hash>'\n"
+exit 1