tools: add makefile for local formatting and linting

Signed-off-by: Packet Please <[email protected]>

Makefile

@@ -0,0 +1,40 @@
+
+LUAPATH = $(HOME)/.luarocks/bin
+PIPPATH = $(HOME)/.local/bin
+
+help:
+	@echo
+	@echo 'Available commands:'
+	@echo '  make deps - Install the prerequisite code analysis tools.'
+	@echo '  make fmt - Apply automatic code formatting. (shell)'
+	@echo '  make lint - Check for frequent issues in code. (shell, lua)'
+	@echo
+.PHONY: help
+
+deps:
+	luarocks --local install luacheck
+	pip install black isort pylint flake8
+	@echo
+	@echo 'Done. Please also install manually with apt or dnf: shellcheck shfmt gitleaks'
+	@echo
+.PHONY: deps
+
+fmt: shfmt # TODO: black isort
+.PHONY: fmt
+
+lint: shellcheck luacheck # TODO: gitleaks flake8 pylint
+.PHONY: lint
+
+shfmt:
+	shfmt -w -l -ln=mksh -i 4 -ci -bn ./luci/ ./packages/
+.PHONY: shfmt
+
+shellcheck:
+	# The excluded cases are supported by Busybox but not POSIX.
+	# TODO update to shellcheck 0.10 for busybox sh support
+	grep -rIzl '^#![[:blank:]]*/bin/sh' ./packages ./luci | xargs shellcheck -S warning -e SC3003,SC3014,SC3018,SC3020,SC3039,SC3043,SC3060
+.PHONY: shellcheck
+
+luacheck:
+	$(LUAPATH)/luacheck ./packages ./luci -q -o 'nowarningsplease'
+.PHONY: luacheck