.PHONY: shellcheck
shellcheck: $(SCRIPTS) $(SHELLCHECKSCRIPTS)

# ShellCheck exclusions
#
# ShellCheck can't follow non-constant source. Use a directive to specify location. [SC1090]
# Not following: a was not specified as input (see shellcheck -x). [SC1091]
# Prefer putting braces around variable references even when not strictly required. [SC2250]
# In POSIX sh, 'local' is undefined. [SC2039] # older ShellCheck versions
# In POSIX sh, 'local' is undefined. [SC3043] # newer ShellCheck versions
if HAVE_SHELLCHECK
	[ -z "$(SCRIPTS)$(SHELLCHECKSCRIPTS)" ] && exit; shellcheck --format=gcc --enable=all --exclude=SC1090,SC1091,SC2039,SC2250,SC3043 $$([ -n "$(SHELLCHECK_SHELL)" ] && echo "--shell=$(SHELLCHECK_SHELL)") $(SHELLCHECK_OPTS) $(SCRIPTS) $(SHELLCHECKSCRIPTS)
else
	@[ -z "$(SCRIPTS)$(SHELLCHECKSCRIPTS)" ] && exit; echo "skipping shellcheck of" $(SCRIPTS) $(SHELLCHECKSCRIPTS) "because shellcheck is not installed"
endif
	@set -e; for dir in $(SHELLCHECKDIRS); do $(MAKE) -C $$dir shellcheck; done


# command -v *is* specified by POSIX and every shell in existence supports it
.PHONY: checkbashisms
checkbashisms: $(SCRIPTS) $(SHELLCHECKSCRIPTS)
if HAVE_CHECKBASHISMS
	[ -z "$(SCRIPTS)$(SHELLCHECKSCRIPTS)" ] && exit; ! if [ -z "$(SHELLCHECK_SHELL)" ]; then \
	    checkbashisms -npx $(SCRIPTS) $(SHELLCHECKSCRIPTS); else \
	    for f in $(SCRIPTS) $(SHELLCHECKSCRIPTS); do echo $$f >&3; { echo '#!/bin/$(SHELLCHECK_SHELL)'; cat $$f; } | checkbashisms -npx; done; \
	fi 3>&2 2>&1 | grep -vFe "'command' with option other than -p" -e 'command -v' $(CHECKBASHISMS_IGNORE) >&2
else
	@[ -z "$(SCRIPTS)$(SHELLCHECKSCRIPTS)" ] && exit; echo "skipping checkbashisms of" $(SCRIPTS) $(SHELLCHECKSCRIPTS) "because checkbashisms is not installed"
endif
	@set -e; for dir in $(SHELLCHECKDIRS); do $(MAKE) -C $$dir checkbashisms; done