makefilet/include/release.mk

# versioning
BUMP_VERSION_CONFIG = .bumpversion.cfg
# allow missing "patch" number
BUMP_VERSION_PARSE_REGEX = (?P<major>\d+)\.(?P<minor>\d+)(?:\.(?P<patch>\d+))?
CURRENT_VERSION_FILE ?= VERSION
BUMP_VERSION_FILES = $(shell sed -n 's/^\[bumpversion:file:\(.*\)\]$$/\1/p' "$(BUMP_VERSION_CONFIG)")
IS_VERSION_WITH_BUMPVERSION = $(wildcard .bumpversion.cfg)
IS_VERSION_WITH_GIT = $(wildcard .git)
IS_VERSION_WITH_DEB = $(wildcard debian/changelog)

get_current_version = $(shell cat "$(CURRENT_VERSION_FILE)")


.PHONY: help
help: help-release

.PHONY: help-release
help-release:
	@echo "Release-related packaging targets:"
	@echo "    release-major"
	@echo "    release-minor"
	@echo "    release-patch"
	@echo "    release-undo"
	@echo "    release-push"
	@echo

release-major: VERSION_BUMP=major
release-minor: VERSION_BUMP=minor
release-patch: VERSION_BUMP=patch

.PHONY: release-major release-minor release-patch
release-major release-minor release-patch: release-generic

.PHONY: release-generic
ifneq ($(IS_VERSION_WITH_BUMPVERSION),)
release-generic:: | release-bumpversion
endif
ifneq ($(IS_VERSION_WITH_DEB),)
release-generic:: | release-debchange
endif
# take care for the ordering: 'release-git' needs to run before '-debchange' and '-bumpversion'
ifneq ($(IS_VERSION_WITH_GIT),)
release-generic:: release-git
endif


.PHONY: release-bumpversion
release-bumpversion:
	@if [ ! -e "$(BUMP_VERSION_CONFIG)" ]; then \
		echo >&2 "Configuration file '$(BUMP_VERSION_CONFIG)' missing"; \
		exit 1; \
	fi
	@# bump version without committing (done after updating debian/changelog)
	@bumpversion --config-file "$(BUMP_VERSION_CONFIG)" \
		--parse "$(BUMP_VERSION_PARSE_REGEX)" \
		--current-version "$(call get_current_version)" \
		"$(VERSION_BUMP)"

.PHONY: release-debchange
release-debchange:
	debchange --newversion "$(call get_current_version)-1" "New upstream release"
	debchange --release ""

.PHONY: release-git
release-git:
	git add $(BUMP_VERSION_FILES)
	@# add other version-related files (if they exist)
	for file in "$(BUMP_VERSION_CONFIG)" debian/changelog; do \
		if [ -e "$$file" ]; then git add "$$file"; fi; done
	git commit -m "Bump version: $$(git show "HEAD:$(CURRENT_VERSION_FILE)") -> $(call get_current_version)"
	git tag -a "v$(call get_current_version)" -m "Bump version: $(VERSION_BUMP)"

.PHONY: check-release-is-current-commit
check-release-is-current-commit:
	[ "$$(git show -s --format=%H v$(call get_current_version)^{commit})" \
		= "$$(git show -s --format=%H)" ]; # refuse to run if the current commit is not the latest tag

.PHONY: release-undo
release-undo: check-release-is-current-commit
	[ -z "$$(git status -s)" ]; # refuse to run in a non-clean working directory
	git tag -d "v$(call get_current_version)"
	git reset --hard HEAD~

.PHONY: release-push
release-push:
	git push --follow-tags