# +--------------------------------------------------------------+
# | * * *                moul.io/rules.mk                        |
# +--------------------------------------------------------------+
# |                                                              |
# |     ++              ______________________________________   |
# |     ++++           /                                      \  |
# |      ++++          |                                      |  |
# |    ++++++++++      |   https://moul.io/rules.mk is a set  |  |
# |   +++       |      |   of common Makefile rules that can  |  |
# |   ++         |     |   be configured from the Makefile    |  |
# |   +  -==   ==|     |   or with environment variables.     |  |
# |  (   <*>   <*>     |                                      |  |
# |   |          |    /|                      Manfred Touron  |  |
# |   |         _)   / |                        manfred.life  |  |
# |   |      +++    /  \______________________________________/  |
# |    \      =+   /                                             |
# |     \      +                                                 |
# |     |\++++++                                                 |
# |     |  ++++      ||//                                        |
# |  ___|   |___    _||/__                                     __|
# | /    ---    \   \|  |||                   __ _  ___  __ __/ /|
# |/  |       |  \    \ /                    /  ' \/ _ \/ // / / |
# ||  |       |  |    | |                   /_/_/_/\___/\_,_/_/  |
# +--------------------------------------------------------------+

.PHONY: _default_entrypoint
_default_entrypoint: help

##
## Common helpers
##

rwildcard = $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) $(filter $(subst *,%,$2),$d))
check-program = $(foreach exec,$(1),$(if $(shell PATH="$(PATH)" which $(exec)),,$(error "No $(exec) in PATH")))
my-filter-out = $(foreach v,$(2),$(if $(findstring $(1),$(v)),,$(v)))
novendor = $(call my-filter-out,vendor/,$(1))

##
## rules.mk
##
ifneq ($(wildcard rules.mk),)
.PHONY: rulesmk.bumpdeps
rulesmk.bumpdeps:
	wget -O rules.mk https://raw.githubusercontent.com/moul/rules.mk/master/rules.mk
BUMPDEPS_STEPS += rulesmk.bumpdeps
endif

##
## Maintainer
##

ifneq ($(wildcard .git/HEAD),)
.PHONY: generate.authors
generate.authors: AUTHORS
AUTHORS: .git/
	echo "# This file lists all individuals having contributed content to the repository." > AUTHORS
	echo "# For how it is generated, see 'https://github.com/moul/rules.mk'" >> AUTHORS
	echo >> AUTHORS
	git log --format='%aN <%aE>' | LC_ALL=C.UTF-8 sort -uf >> AUTHORS
GENERATE_STEPS += generate.authors
endif

##
## Golang
##

ifndef GOPKG
ifneq ($(wildcard go.mod),)
GOPKG = $(shell sed '/module/!d;s/^omdule\ //' go.mod)
endif
endif
ifdef GOPKG
GO ?= go
GOPATH ?= $(HOME)/go
GO_INSTALL_OPTS ?=
GO_TEST_OPTS ?= -test.timeout=30s
GOMOD_DIRS ?= $(sort $(call novendor,$(dir $(call rwildcard,*,*/go.mod go.mod))))
GOCOVERAGE_FILE ?= ./coverage.txt
GOTESTJSON_FILE ?= ./go-test.json
GOBUILDLOG_FILE ?= ./go-build.log
GOINSTALLLOG_FILE ?= ./go-install.log

ifdef GOBINS
.PHONY: go.install
go.install:
ifeq ($(CI),true)
	@rm -f /tmp/goinstall.log
	@set -e; for dir in $(GOBINS); do ( set -xe; \
	  cd $$dir; \
	  $(GO) install -v $(GO_INSTALL_OPTS) .; \
	); done 2>&1 | tee $(GOINSTALLLOG_FILE)

else
	@set -e; for dir in $(GOBINS); do ( set -xe; \
	  cd $$dir; \
	  $(GO) install $(GO_INSTALL_OPTS) .; \
	); done
endif
INSTALL_STEPS += go.install

.PHONY: go.release
go.release:
	$(call check-program, goreleaser)
	goreleaser --snapshot --skip-publish --rm-dist
	@echo -n "Do you want to release? [y/N] " && read ans && \
	  if [ $${ans:-N} = y ]; then set -xe; goreleaser --rm-dist; fi
RELEASE_STEPS += go.release
endif

.PHONY: go.unittest
go.unittest:
ifeq ($(CI),true)
	@echo "mode: atomic" > /tmp/gocoverage
	@rm -f $(GOTESTJSON_FILE)
	@set -e; for dir in $(GOMOD_DIRS); do (set -e; (set -euf pipefail; \
		cd $$dir; \
		(($(GO) test ./... $(GO_TEST_OPTS) -cover -coverprofile=/tmp/profile.out -covermode=atomic -race -json && touch $@.ok) | tee -a $(GOTESTJSON_FILE) 3>&1 1>&2 2>&3 | tee -a $(GOBUILDLOG_FILE); \
	  ); \
	  rm $@.ok 2>/dev/null || exit 1; \
	  if [ -f /tmp/profile.out ]; then \
		cat /tmp/profile.out | sed "/mode: atomic/d" >> /tmp/gocoverage; \
		rm -f /tmp/profile.out; \
	  fi)); done
	@mv /tmp/gocoverage $(GOCOVERAGE_FILE)
else
	@echo "mode: atomic" > /tmp/gocoverage
	@set -e; for dir in $(GOMOD_DIRS); do (set -e; (set -xe; \
	  cd $$dir; \
	  $(GO) test ./... $(GO_TEST_OPTS) -cover -coverprofile=/tmp/profile.out -covermode=atomic -race); \
	  if [ -f /tmp/profile.out ]; then \
		cat /tmp/profile.out | sed "/mode: atomic/d" >> /tmp/gocoverage; \
		rm -f /tmp/profile.out; \
	  fi); done
	@mv /tmp/gocoverage $(GOCOVERAGE_FILE)
endif

.PHONY: go.checkdoc
go.checkdoc:
	go doc $(first $(GOMOD_DIRS))

.PHONY: go.coverfunc
go.coverfunc: go.unittest
	go tool cover -func=$(GOCOVERAGE_FILE) | grep -v .pb.go: | grep -v .pb.gw.go:

.PHONY: go.lint
go.lint:
	@set -e; for dir in $(GOMOD_DIRS); do ( set -xe; \
	  cd $$dir; \
	  golangci-lint run --verbose ./...; \
	); done

.PHONY: go.tidy
go.tidy:
	@# tidy dirs with go.mod files
	@set -e; for dir in $(GOMOD_DIRS); do ( set -xe; \
	  cd $$dir; \
	  $(GO)	mod tidy; \
	); done

.PHONY: go.depaware-update
go.depaware-update: go.tidy
	@# gen depaware for bins
	@set -e; for dir in $(GOBINS); do ( set -xe; \
	  cd $$dir; \
	  $(GO) run github.com/tailscale/depaware --update .; \
	); done
	@# tidy unused depaware deps if not in a tools_test.go file
	@set -e; for dir in $(GOMOD_DIRS); do ( set -xe; \
	  cd $$dir; \
	  $(GO)	mod tidy; \
	); done

.PHONY: go.depaware-check
go.depaware-check: go.tidy
	@# gen depaware for bins
	@set -e; for dir in $(GOBINS); do ( set -xe; \
	  cd $$dir; \
	  $(GO) run github.com/tailscale/depaware --check .; \
	); done


.PHONY: go.build
go.build:
	@set -e; for dir in $(GOMOD_DIRS); do ( set -xe; \
	  cd $$dir; \
	  $(GO)	build ./...; \
	); done

.PHONY: go.bump-deps
go.bumpdeps:
	@set -e; for dir in $(GOMOD_DIRS); do ( set -xe; \
	  cd $$dir; \
	  $(GO)	get -u ./...; \
	); done

.PHONY: go.fmt
go.fmt:
	@set -e; for dir in $(GOMOD_DIRS); do ( set -xe; \
	  cd $$dir; \
	  $(GO) run golang.org/x/tools/cmd/goimports -w `go list -f '{{.Dir}}' ./...` \
	); done

VERIFY_STEPS += go.depaware-check
BUILD_STEPS += go.build
BUMPDEPS_STEPS += go.bumpdeps go.depaware-update
TIDY_STEPS += go.tidy
LINT_STEPS += go.lint
UNITTEST_STEPS += go.unittest
FMT_STEPS += go.fmt

# FIXME: disabled, because currently slow
# new rule that is manually run sometimes, i.e. `make pre-release` or `make maintenance`.
# alternative: run it each time the go.mod is changed
#GENERATE_STEPS += go.depaware-update
endif

##
## Gitattributes
##

ifneq ($(wildcard .gitattributes),)
.PHONY: _linguist-ignored
_linguist-kept:
	@git check-attr linguist-vendored $(shell git check-attr linguist-generated $(shell find . -type f | grep -v .git/) | grep unspecified | cut -d: -f1) | grep unspecified | cut -d: -f1 | sort

.PHONY: _linguist-kept
_linguist-ignored:
	@git check-attr linguist-vendored linguist-ignored `find . -not -path './.git/*' -type f` | grep '\ set$$' | cut -d: -f1 | sort -u
endif

##
## Node
##

ifndef NPM_PACKAGES
ifneq ($(wildcard package.json),)
NPM_PACKAGES = .
endif
endif
ifdef NPM_PACKAGES
.PHONY: npm.publish
npm.publish:
	@echo -n "Do you want to npm publish? [y/N] " && read ans && \
	@if [ $${ans:-N} = y ]; then \
	  set -e; for dir in $(NPM_PACKAGES); do ( set -xe; \
		cd $$dir; \
		npm publish --access=public; \
	  ); done; \
	fi
RELEASE_STEPS += npm.publish
endif

##
## Docker
##

docker_build =	docker build \
	  --build-arg VCS_REF=`git rev-parse --short HEAD` \
	  --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
	  --build-arg VERSION=`git describe --tags --always` \
	  -t "$2" -f "$1" "$(dir $1)"

ifndef DOCKERFILE_PATH
DOCKERFILE_PATH = ./Dockerfile
endif
ifndef DOCKER_IMAGE
ifneq ($(wildcard Dockerfile),)
DOCKER_IMAGE = $(notdir $(PWD))
endif
endif
ifdef DOCKER_IMAGE
ifneq ($(DOCKER_IMAGE),none)
.PHONY: docker.build
docker.build:
	$(call check-program, docker)
	$(call docker_build,$(DOCKERFILE_PATH),$(DOCKER_IMAGE))

BUILD_STEPS += docker.build
endif
endif

##
## Common
##

TEST_STEPS += $(UNITTEST_STEPS)
TEST_STEPS += $(LINT_STEPS)
TEST_STEPS += $(TIDY_STEPS)

ifneq ($(strip $(TEST_STEPS)),)
.PHONY: test
test: $(PRE_TEST_STEPS) $(TEST_STEPS)
endif

ifdef INSTALL_STEPS
.PHONY: install
install: $(PRE_INSTALL_STEPS) $(INSTALL_STEPS)
endif

ifdef UNITTEST_STEPS
.PHONY: unittest
unittest: $(PRE_UNITTEST_STEPS) $(UNITTEST_STEPS)
endif

ifdef LINT_STEPS
.PHONY: lint
lint: $(PRE_LINT_STEPS) $(FMT_STEPS) $(LINT_STEPS)
endif

ifdef TIDY_STEPS
.PHONY: tidy
tidy: $(PRE_TIDY_STEPS) $(TIDY_STEPS)
endif

ifdef BUILD_STEPS
.PHONY: build
build: $(PRE_BUILD_STEPS) $(BUILD_STEPS)
endif

ifdef VERIFY_STEPS
.PHONY: verify
verify: $(PRE_VERIFY_STEPS) $(VERIFY_STEPS)
endif

ifdef RELEASE_STEPS
.PHONY: release
release: $(PRE_RELEASE_STEPS) $(RELEASE_STEPS)
endif

ifdef BUMPDEPS_STEPS
.PHONY: bumpdeps
bumpdeps: $(PRE_BUMDEPS_STEPS) $(BUMPDEPS_STEPS)
endif

ifdef FMT_STEPS
.PHONY: fmt
fmt: $(PRE_FMT_STEPS) $(FMT_STEPS)
endif

ifdef GENERATE_STEPS
.PHONY: generate
generate: $(PRE_GENERATE_STEPS) $(GENERATE_STEPS)
endif

.PHONY: help
help::
	@echo "General commands:"
	@[ "$(BUILD_STEPS)" != "" ]     && echo "  build"     || true
	@[ "$(BUMPDEPS_STEPS)" != "" ]  && echo "  bumpdeps"  || true
	@[ "$(FMT_STEPS)" != "" ]       && echo "  fmt"       || true
	@[ "$(GENERATE_STEPS)" != "" ]  && echo "  generate"  || true
	@[ "$(INSTALL_STEPS)" != "" ]   && echo "  install"   || true
	@[ "$(LINT_STEPS)" != "" ]      && echo "  lint"      || true
	@[ "$(RELEASE_STEPS)" != "" ]   && echo "  release"   || true
	@[ "$(TEST_STEPS)" != "" ]      && echo "  test"      || true
	@[ "$(TIDY_STEPS)" != "" ]      && echo "  tidy"      || true
	@[ "$(UNITTEST_STEPS)" != "" ]  && echo "  unittest"  || true
	@[ "$(VERIFY_STEPS)" != "" ]    && echo "  verify"    || true
	@# FIXME: list other commands

print-% : ; $(info $* is a $(flavor $*) variable set to [$($*)]) @true