	# Note: With Travis CI:
	#  - the path to urchin is passed via the command line.
	#  - the other utilties are NOT needed, so we skip the test for their existence.
URCHIN := urchin
ifeq ($(findstring /,$(URCHIN)),) # urchin path was NOT passed in.
		# Add the local npm packages' bin folder to the PATH, so that `make` can find them, when invoked directly.
	export PATH := $(shell printf '%s' "$$(npm bin):$$PATH")
		# The list of all supporting utilities, installed with `npm install`.
	UTILS := $(URCHIN) replace semver
		# Make sure that all required utilities can be located.
	UTIL_CHECK := $(or $(shell PATH="$(PATH)" which $(UTILS) >/dev/null && echo 'ok'),$(error Did you forget to run `npm install` after cloning the repo? At least one of the required supporting utilities not found: $(UTILS)))
endif
	# The files that need updating when incrementing the version number.
VERSIONED_FILES := nvm.sh install.sh README.markdown package.json
	# Define all shells to test with. Can be overridden with `make SHELLS=... <target>`.
SHELLS := sh bash dash zsh # ksh (#574)
	# Generate 'test-<shell>' target names from specified shells.
	# The embedded shell names are extracted on demand inside the recipes.
SHELL_TARGETS := $(addprefix test-,$(SHELLS))
	# Determine if the installed Urchin version supports cross-shell testing, based on whether its usage information mentions the -s option.
HAVE_CROSS_SHELL_TESTS := $(shell PATH="$(PATH)" $(URCHIN) -h | grep -qE '(^|\s)-s\s' && echo 'yes')
NO_CROSS_SHELL_TESTS_WARNING := $(if $(HAVE_CROSS_SHELL_TESTS),,$(warning WARNING: This version of Urchin does not support cross-shell tests. All tests will run with 'sh'.))
	# Define the default test suite(s). This can be overridden with `make TEST_SUITE=<...>  <target>`.
	# Test suites are the names of subfolders of './test'.
TEST_SUITE := $(shell find ./test/* -type d -prune -exec basename {} \;)


# Default target (by virtue of being the first non '.'-prefixed in the file).
.PHONY: _no-target-specified
_no-target-specified:
	$(error Please specify the target to make - `make list` shows targets. Alternatively, use `npm test` to run the default tests; `npm run` shows all tests)

# Lists all targets defined in this makefile.
.PHONY: list
list:
	@$(MAKE) -pRrn : -f $(MAKEFILE_LIST) 2>/dev/null | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' | egrep -v -e '^[^[:alnum:]]' -e '^$@$$' | sort

# Set of test-<shell> targets; each runs the specified test suites for a single shell.
# Note that preexisting NVM_* variables are unset to avoid interfering with tests, except when running the Travis tests (where NVM_DIR must be passed in and the env. is assumed to be pristine).
.PHONY: $(SHELL_TARGETS)
$(SHELL_TARGETS):
	@shell='$@'; shell=$${shell##*-}; which "$$shell" >/dev/null || { printf '\033[0;31m%s\033[0m\n' "WARNING: Cannot test with shell '$$shell': not found." >&2; exit 0; } && \
	 printf '\n\033[0;34m%s\033[0m\n' "Running tests in $$shell"; \
	 [ -z "$$TRAVIS_BUILD_DIR" ] && for v in $$(export -p | awk -F'[ =]' '$$2 ~ "^NVM_" { print $$2 }'); do unset $$v; done && unset v; \
	 [ "$(HAVE_CROSS_SHELL_TESTS)" = 'yes' ] && targetShellOpt="-s $$shell" || targetShellOpt=; \
	 for suite in $(TEST_SUITE); do $(URCHIN) -f $$targetShellOpt test/$$suite || exit; done

# All-tests target: invokes the specified test suites for ALL shells defined in $(SHELLS).
.PHONY: test
test: $(SHELL_TARGETS)

.PHONY: _ensure-tag
_ensure-tag:
ifndef TAG
	$(error Please invoke with `make TAG=<new-version> release`, where <new-version> is either an increment specifier (patch, minor, major, prepatch, preminor, premajor, prerelease), or an explicit major.minor.patch version number)
endif

# Ensures that the git workspace is clean.
.PHONY: _ensure-clean
_ensure-clean:
	@[ -z "$$(git status --porcelain --untracked-files=no || echo err)" ] || { echo "Workspace is not clean; please commit changes first." >&2; exit 2; }

# Makes a release; invoke with `make TAG=<versionOrIncrementSpec> release`.
.PHONY: release
release: _ensure-tag _ensure-clean
	@old_ver=`git describe --abbrev=0 --tags --match 'v[0-9]*.[0-9]*.[0-9]*'` || { echo "Failed to determine current version." >&2; exit 1; }; old_ver=$${old_ver#v}; \
	 new_ver=`echo "$(TAG)" | sed 's/^v//'`; new_ver=$${new_ver:-patch}; \
	 if printf "$$new_ver" | grep -q '^[0-9]'; then \
	   semver "$$new_ver" >/dev/null || { echo 'Invalid version number specified: $(TAG) - must be major.minor.patch' >&2; exit 2; }; \
	   semver -r "> $$old_ver" "$$new_ver" >/dev/null || { echo 'Invalid version number specified: $(TAG) - must be HIGHER than current one.' >&2; exit 2; } \
	 else \
	   new_ver=`semver -i "$$new_ver" "$$old_ver"` || { echo 'Invalid version-increment specifier: $(TAG)' >&2; exit 2; } \
	 fi; \
	 printf "=== Bumping version **$$old_ver** to **$$new_ver** before committing and tagging:\n=== TYPE 'proceed' TO PROCEED, anything else to abort: " && read response && [ "$$response" = 'proceed' ] || { echo 'Aborted.' >&2; exit 2; };  \
	 replace "$$old_ver" "$$new_ver" -- $(VERSIONED_FILES) && \
	 git commit -m "v$$new_ver" $(VERSIONED_FILES) && \
	 git tag -a -m "v$$new_ver" "v$$new_ver"