Add option for mass gradient-based fluxes #386

	name: Linters

	on:
	pull_request:
	# Build when a pull request targets main
	branches:
	- main

	jobs:
	linter:
	name: Lint checks
	runs-on: ubuntu-latest
	timeout-minutes: 10
	steps:
	- uses: actions/checkout@v3
	name: Checkout the repository
	with:
	fetch-depth: 100
	- name: Setup Python
	uses: actions/setup-python@v4
	with:
	python-version: '3.10'
	- name: Check example keywords
	run: python3 doc/example-keywords.py compare
	- name: Get changed C++ files
	if: success() \|\| failure()
	id: changed-cxx-files
	uses: tj-actions/changed-files@v41
	with:
	files: \|
	**.h
	**.cpp
	# Comment blocks starting with "/*!" do not support autobrief
	- name: Check for problematic Doxygen comment blocks
	if: (success() \|\| failure()) && steps.changed-cxx-files.outputs.any_changed == 'true'
	run: \|
	RETCODE=0
	for file in ${{ steps.changed-cxx-files.outputs.all_changed_files }}; do
	RESULT=`perl -0777 -ne 'while(m/\n\n \/\!.?\\//gs){print "$&\n";}' $file`
	if [ "$RESULT" ]; then
	echo ------ ${file} ------
	echo "$RESULT"
	RETCODE=1
	fi
	done
	exit $RETCODE
	- name: Whitespace errors
	if: success() \|\| failure()
	run: \|
	git config --global core.autocrlf false
	git config --global core.whitespace \
	-cr-at-eol,tab-in-indent,blank-at-eol,blank-at-eof
	git diff --check ${{ github.event.pull_request.base.sha }}

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