CI: extend check style for Fortran

.gitlab-ci.yml

@@ -45,12 +45,25 @@ check_style:
     RED: '\033[0;31m'
     STYLE_PATCH: ${CI_PROJECT_DIR}/style.patch
   before_script:
-    - apk add git clang-extra-tools
+    - apk add git clang-extra-tools python3 py3-pip
+    # We use --break-system-packages because fprettify is not installable via
+    # "apk add py3-fprettify":
+    - python -m pip install --break-system-packages fprettify
   script:
     # Exclude the automatically generated mtime_iso8601.c:
     - >-
       clang-format --style=file -i
       $(find ${CI_PROJECT_DIR} -name 'mtime_iso8601.c' -prune -o \( -name '*.h' -o -name '*.c' \) -print)
+    # We do not use a config file but specify the formatting arguments on the
+    # command line because the feature does not work for certain arguments even
+    # in the latest release
+    # (e.g., see https://github.com/pseewald/fprettify/issues/94):
+    - >-
+      fprettify
+      --case 2 2 2 1
+      --indent 2
+      --whitespace 2
+      --recursive ${CI_PROJECT_DIR}
     - git -C ${CI_PROJECT_DIR} diff --patch-with-raw > ${STYLE_PATCH}
     - |
       # Test if patching is necessary: