Makefile to use for incremental semantic versioning

Makefile.version

MAKE               := make --no-print-directory

DESCRIBE           := $(shell git describe --match "v*" --always --tags)
DESCRIBE_PARTS     := $(subst -, ,$(DESCRIBE))

VERSION_TAG        := $(word 1,$(DESCRIBE_PARTS))
COMMITS_SINCE_TAG  := $(word 2,$(DESCRIBE_PARTS))

VERSION            := $(subst v,,$(VERSION_TAG))
VERSION_PARTS      := $(subst ., ,$(VERSION))

MAJOR              := $(word 1,$(VERSION_PARTS))
MINOR              := $(word 2,$(VERSION_PARTS))
MICRO              := $(word 3,$(VERSION_PARTS))

NEXT_MAJOR         := $(shell echo $$(($(MAJOR)+1)))
NEXT_MINOR         := $(shell echo $$(($(MINOR)+1)))
NEXT_MICRO          = $(shell echo $$(($(MICRO)+$(COMMITS_SINCE_TAG))))

ifeq ($(strip $(COMMITS_SINCE_TAG)),)
CURRENT_VERSION_MICRO := $(MAJOR).$(MINOR).$(MICRO)
CURRENT_VERSION_MINOR := $(CURRENT_VERSION_MICRO)
CURRENT_VERSION_MAJOR := $(CURRENT_VERSION_MICRO)
else
CURRENT_VERSION_MICRO := $(MAJOR).$(MINOR).$(NEXT_MICRO)
CURRENT_VERSION_MINOR := $(MAJOR).$(NEXT_MINOR).0
CURRENT_VERSION_MAJOR := $(NEXT_MAJOR).0.0
endif

DATE                = $(shell date +'%d.%m.%Y')
TIME                = $(shell date +'%H:%M:%S')
COMMIT             := $(shell git rev-parse HEAD)
AUTHOR             := $(firstword $(subst @, ,$(shell git show --format="%aE" $(COMMIT))))
BRANCH_NAME        := $(shell git rev-parse --abbrev-ref HEAD)

TAG_MESSAGE         = "$(TIME) $(DATE) $(AUTHOR) $(BRANCH_NAME)"
COMMIT_MESSAGE     := $(shell git log --format=%B -n 1 $(COMMIT))

CURRENT_TAG_MICRO  := "v$(CURRENT_VERSION_MICRO)"
CURRENT_TAG_MINOR  := "v$(CURRENT_VERSION_MINOR)"
CURRENT_TAG_MAJOR  := "v$(CURRENT_VERSION_MAJOR)"

# --- Version commands ---

.PHONY: version
version:
	@$(MAKE) version-micro

.PHONY: version-micro
version-micro:
	@echo "$(CURRENT_VERSION_MICRO)"

.PHONY: version-minor
version-minor:
	@echo "$(CURRENT_VERSION_MINOR)"

.PHONY: version-major
version-major:
	@echo "$(CURRENT_VERSION_MAJOR)"

# --- Tag commands ---

.PHONY: tag-micro
tag-micro:
	@echo "$(CURRENT_TAG_MICRO)"

.PHONY: tag-minor
tag-minor:
	@echo "$(CURRENT_TAG_MINOR)"

.PHONY: tag-major
tag-major:
	@echo "$(CURRENT_TAG_MAJOR)"

# -- Meta info ---

.PHONY: tag-message
tag-message:
	@echo "$(TAG_MESSAGE)"

.PHONY: commit-message
commit-message:
	@echo "$(COMMIT_MESSAGE)"

Thank you , very useful!

Brilliant - thanks! Might want to mention that it requires at least one tag to work e.g. git tag v0.0.1.

Love it, perfect for dropping right into an existing Makefile without any complications. Thanks a ton!