##
# GIT

# target git-branch-create-upstream-%: Create git BRANCH from upstream/% branch
.PHONY: git-branch-create-upstream-%
git-branch-create-upstream-%: myos-base update-upstream
	$(RUN) $(call exec,git fetch --prune upstream)
	$(call exec,git rev-parse --verify $(BRANCH) >/dev/null 2>&1) \
		&& $(call WARNING,present branch,$(BRANCH)) \
		|| $(RUN) $(call exec,git branch $(BRANCH) upstream/$*)
	$(call exec,[ $$(git ls-remote --heads upstream $(BRANCH) |wc -l) -eq 0 ]) \
		&& $(RUN) $(call exec,git push upstream $(BRANCH)) \
		|| $(call WARNING,present branch,$(BRANCH),upstream)
	$(RUN) $(call exec,git checkout $(BRANCH))

# target git-branch-delete: Delete git BRANCH
.PHONY: git-branch-delete
git-branch-delete: myos-base update-upstream
	$(call exec,git rev-parse --verify $(BRANCH) >/dev/null 2>&1) \
		&& $(RUN) $(call exec,git branch -d $(BRANCH)) \
		|| $(call WARNING,no branch,$(BRANCH))
	$(foreach remote,upstream,$(call exec,[ $$(git ls-remote --heads $(remote) $(BRANCH) |wc -l) -eq 1 ]) \
		&& $(RUN) $(call exec,git push $(remote) :$(BRANCH)) \
		|| $(call WARNING,no branch,$(BRANCH),$(remote)) \
		&&) true

# target git-branch-merge-upstream-%: Merge git BRANCH into upstream/% branch
.PHONY: git-branch-merge-upstream-%
git-branch-merge-upstream-%: myos-base update-upstream
	$(RUN) $(call exec,git rev-parse --verify $(BRANCH) >/dev/null 2>&1)
	$(RUN) $(call exec,git checkout $(BRANCH))
	$(RUN) $(call exec,git pull --ff-only upstream $(BRANCH))
	$(RUN) $(call exec,git push upstream $(BRANCH))
	$(RUN) $(call exec,git checkout $*)
	$(RUN) $(call exec,git pull --ff-only upstream $*)
	$(RUN) $(call exec,git merge --no-ff --no-edit $(BRANCH))
	$(RUN) $(call exec,git push upstream $*)

# target git-stash: git stash
.PHONY: git-stash
git-stash: myos-base git-status
	if [ ! $(STATUS) -eq 0 ]; then \
		$(RUN) $(call exec,git stash); \
	fi

# target git-status: Define STATUS with number of lines of git status
.PHONY: git-status
git-status: myos-base
	$(eval IGNORE_DRYRUN := true)
	$(eval STATUS := $(shell $(call exec,sh -c 'git status -uno --porcelain 2>/dev/null |wc -l')))
	$(eval IGNORE_DRYRUN := false)

# target git-tag-create-upstream-%: Create git TAG to reference upstream/% branch
.PHONY: git-tag-create-upstream-%
git-tag-create-upstream-%: myos-base update-upstream
ifneq ($(words $(TAG)),0)
	$(RUN) $(call exec,git checkout $*)
	$(RUN) $(call exec,git pull --tags --prune upstream $*)
	$(RUN) $(call sed,s/^##\? $(TAG).*/## $(TAG) - $(shell date +%Y-%m-%d)/,CHANGELOG.md)
	$(call exec,[ $$(git diff CHANGELOG.md 2>/dev/null |wc -l) -eq 0 ]) \
		|| $(RUN) $(call exec,git commit -m "$$(cat CHANGELOG.md |sed -n '/$(TAG)/,/^$$/{s/##\(.*\)/release\1\n/;p;}')" CHANGELOG.md)
	$(call exec,[ $$(git tag -l $(TAG) |wc -l) -eq 0 ]) \
		|| $(RUN) $(call exec,git tag -d $(TAG))
	$(RUN) $(call exec,git tag $(TAG))
	$(call exec,[ $$(git ls-remote --tags upstream $(TAG) |wc -l) -eq 0 ]) \
		|| $(RUN) $(call exec,git push upstream :refs/tags/$(TAG))
	$(RUN) $(call exec,git push --tags upstream $*)
endif

# target git-tag-merge-upstream-%: Merge git TAG into upstream/% branch
.PHONY: git-tag-merge-upstream-%
git-tag-merge-upstream-%: myos-base update-upstream
ifneq ($(words $(TAG)),0)
	$(RUN) $(call exec,git fetch --tags -u --prune upstream $*:$*)
	$(RUN) $(call exec,git checkout $*)
	$(RUN) $(call exec,git merge --ff --no-edit $(TAG))
	$(RUN) $(call exec,git push upstream $*)
endif

# target git-unstash: git stash pop
.PHONY: git-unstash
git-unstash: myos-base
	$(eval STATUS ?= 0)
	if [ ! $(STATUS) -eq 0 ]; then \
		$(RUN) $(call exec,git stash pop); \
	fi