Shellcheck.am

# Global 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]
# Consider invoking this command separately to avoid masking its return value (or use '|| true' to ignore). [SC2312]
# In POSIX sh, 'local' is undefined. [SC2039] # older ShellCheck versions
# In POSIX sh, 'local' is undefined. [SC3043] # newer ShellCheck versions

SHELLCHECKSCRIPTS =

JUST_SHELLCHECK_OPTS    = $(addprefix shellcheck-here-,$(subst /,^,$(1)))
JUST_CHECKBASHISMS_OPTS = $(addprefix checkbashisms-here-,$(subst /,^,$(1)))
SHELLCHECK_OPTS         = $(call JUST_SHELLCHECK_OPTS,$(1)) $(call JUST_CHECKBASHISMS_OPTS,$(1))

PHONY += shellcheck

_STGT = $(subst ^,/,$(subst shellcheck-here-,,$@))
shellcheck-here-%:
if HAVE_SHELLCHECK
	shellcheck --format=gcc --enable=all --exclude=SC1090,SC1091,SC2039,SC2250,SC2312,SC3043 $$([ -n "$(SHELLCHECK_SHELL)" ] && echo "--shell=$(SHELLCHECK_SHELL)") "$$([ -e "$(_STGT)" ] || echo "$(srcdir)/")$(_STGT)"
else
	@echo "skipping shellcheck of" $(_STGT) "because shellcheck is not installed"
endif

shellcheck: $(SHELLCHECKSCRIPTS) $(call JUST_SHELLCHECK_OPTS,$(SHELLCHECKSCRIPTS))


PHONY += checkbashisms

# command -v *is* specified by POSIX and every shell in existence supports it
_BTGT = $(subst ^,/,$(subst checkbashisms-here-,,$@))
checkbashisms-here-%:
if HAVE_CHECKBASHISMS
	! { [ -n "$(SHELLCHECK_SHELL)" ] && echo '#!/bin/$(SHELLCHECK_SHELL)'; cat "$$([ -e "$(_BTGT)" ] || echo "$(srcdir)/")$(_BTGT)"; } | \
	checkbashisms -npx 2>&1 | grep -vFe "'command' with option other than -p" -e 'command -v' -e 'any possible bashisms' $(CHECKBASHISMS_IGNORE) >&2
else
	@echo "skipping checkbashisms of" $(_BTGT) "because checkbashisms is not installed"
endif

checkbashisms: $(SHELLCHECKSCRIPTS) $(call JUST_CHECKBASHISMS_OPTS,$(SHELLCHECKSCRIPTS))