# GIT_LFS_SHA is the '--short'-form SHA1 of the current revision of Git LFS.
GIT_LFS_SHA ?= $(shell git rev-parse --short HEAD)
# VERSION is the longer-form describe output of the current revision of Git LFS,
# used for identifying intermediate releases.
#
# If Git LFS is being built for a published release, VERSION and GIT_LFS_SHA
# should be identical.
VERSION ?= $(shell git describe HEAD)

# GO is the name of the 'go' binary used to compile Git LFS.
GO ?= go

# GO_TEST_EXTRA_ARGS are extra arguments given to invocations of 'go test'.
#
# Examples include:
#
# 	make test GO_TEST_EXTRA_ARGS=-v
# 	make test GO_TEST_EXTRA_ARGS='-run TestMyExample'
GO_TEST_EXTRA_ARGS =

# BUILTIN_LD_FLAGS are the internal flags used to pass to the linker. By default
# the config.GitCommit variable is always set via this variable, and
# DWARF-stripping is enabled unless DWARF=YesPlease.
BUILTIN_LD_FLAGS =
BUILTIN_LD_FLAGS += -X github.com/git-lfs/git-lfs/config.GitCommit=$(GIT_LFS_SHA)
ifneq ("$(DWARF)","YesPlease")
BUILTIN_LD_FLAGS += -s
BUILTIN_LD_FLAGS += -w
endif
# EXTRA_LD_FLAGS are given by the caller, and are passed to the Go linker after
# BUILTIN_LD_FLAGS are processed.
EXTRA_LD_FLAGS =
# LD_FLAGS is the union of the above two BUILTIN_LD_FLAGS and EXTRA_LD_FLAGS.
LD_FLAGS = $(BUILTIN_LD_FLAGS) $(EXTRA_LD_FLAGS)

# BUILTIN_GC_FLAGS are the internal flags used to pass compiler.
BUILTIN_GC_FLAGS =
# EXTRA_GC_FLAGS are the caller-provided flags to pass to the compiler.
EXTRA_GC_FLAGS =
# GC_FLAGS are the union of the above two BUILTIN_GC_FLAGS and EXTRA_GC_FLAGS.
GC_FLAGS = $(BUILTIN_GC_FLAGS) $(EXTRA_GC_FLAGS)

# GLIDE is the name of the 'glide' binary used to manage vendored dependencies.
GLIDE ?= glide

# RONN is the name of the 'ronn' program used to generate man pages.
RONN ?= ronn
# RONN_EXTRA_ARGS are extra arguments given to the $(RONN) program when invoked.
RONN_EXTRA_ARGS ?=

# GREP is the name of the program used for regular expression matching, or
# 'grep' if unset.
GREP ?= grep
# RM is the name of the program used removing files, or 'rm -f' if unset.
RM ?= rm -f
# XARGS is the name of the program used to turn stdin into program arguments, or
# 'xargs' if unset.
XARGS ?= xargs

# GOIMPORTS is the name of the program formatter used before compiling.
GOIMPORTS ?= goimports
# GOIMPORTS_EXTRA_OPTS are the default options given to the $(GOIMPORTS)
# program.
GOIMPORTS_EXTRA_OPTS ?= -w -l

# SOURCES is a listing of all .go files in this and child directories, excluding
# that in vendor.
SOURCES = $(shell find . -type f -name '*.go' | grep -v vendor)
# PKGS is a listing of packages that are considered to be a part of Git LFS, and
# are used in package-specific commands, such as the 'make test' targets. For
# example:
#
# 	make test                               # run 'go test' in all packages
# 	make PKGS='config git/githistory' test  # run 'go test' in config and
# 	                                        # git/githistory
#
# By default, it is a listing of all packages in Git LFS. When new packages (or
# sub-packages) are created, they should be added here.
ifndef PKGS
PKGS =
PKGS += commands
PKGS += config
PKGS += errors
PKGS += filepathfilter
PKGS += fs
PKGS += git
PKGS += git/gitattr
PKGS += git/githistory
PKGS += git
PKGS += lfs
PKGS += lfsapi
PKGS += locking
PKGS += subprocess
PKGS += tasklog
PKGS += tools
PKGS += tools/humanize
PKGS += tools/kv
PKGS += tq
endif

# X is the platform-specific extension for Git LFS binaries. It is automatically
# set to .exe on Windows, and the empty string on all other platforms. It may be
# overridden.
#
# BUILD_MAIN is the main ".go" file that contains func main() for Git LFS. On
# macOS and other non-Windows platforms, it is required that a specific
# entrypoint be given, hence the below conditional. On Windows, it is required
# that an entrypoint not be given so that goversioninfo can successfully embed
# the resource.syso file (for more, see below).
ifeq ($(OS),Windows_NT)
X ?= .exe
BUILD_MAIN ?=
else
X ?=
BUILD_MAIN ?= ./git-lfs.go
endif

# BUILD is a macro used to build a single binary of Git LFS using the above
# LD_FLAGS and GC_FLAGS.
#
# It takes three arguments:
#
# 	$(1) - a valid GOOS value, or empty-string
# 	$(2) - a valid GOARCH value, or empty-string
# 	$(3) - an optional program extension. If $(3) is given as '-foo', then the
# 	       program will be written to bin/git-lfs-foo.
#
# It uses BUILD_MAIN as defined above to specify the entrypoint for building Git
# LFS.
BUILD = GOOS=$(1) GOARCH=$(2) \
	$(GO) build \
	-ldflags="$(LD_FLAGS)" \
	-gcflags="$(GC_FLAGS)" \
	-o ./bin/git-lfs$(3) $(BUILD_MAIN)

# BUILD_TARGETS is the set of all platforms and architectures that Git LFS is
# built for.
BUILD_TARGETS = bin/git-lfs-darwin-amd64 bin/git-lfs-darwin-386 \
	bin/git-lfs-linux-amd64 bin/git-lfs-linux-386 \
	bin/git-lfs-freebsd-amd64 bin/git-lfs-freebsd-386 \
	bin/git-lfs-windows-amd64.exe bin/git-lfs-windows-386.exe

# mangen is a shorthand for ensuring that commands/mancontent_gen.go is kept
# up-to-date with the contents of docs/man/*.ronn.
.PHONY : mangen
mangen : commands/mancontent_gen.go

# commands/mancontent_gen.go is generated by running 'go generate' on package
# 'commands' of Git LFS. It depends upon the contents of the 'docs' directory
# and converts those manpages into code.
commands/mancontent_gen.go : $(wildcard docs/man/*.ronn)
	$(GO) generate github.com/git-lfs/git-lfs/commands

# Targets 'all' and 'build' build binaries of Git LFS for the above release
# matrix.
.PHONY : all build
all build : $(BUILD_TARGETS)

# The following bin/git-lfs-% targets make a single binary compilation of Git
# LFS for a specific operating system and architecture pair.
#
# They function by translating target names into arguments for the above BUILD
# builtin, and appending the appropriate suffix to the build target.
#
# On Windows, they also depend on the resource.syso target, which installs and
# embeds the versioninfo into the binary.
bin/git-lfs-darwin-amd64 : $(SOURCES) mangen
	$(call BUILD,darwin,amd64,-darwin-amd64)
bin/git-lfs-darwin-386 : $(SOURCES) mangen
	$(call BUILD,darwin,386,-darwin-386)
bin/git-lfs-linux-amd64 : $(SOURCES) mangen
	$(call BUILD,linux,amd64,-linux-amd64)
bin/git-lfs-linux-386 : $(SOURCES) mangen
	$(call BUILD,linux,386,-linux-386)
bin/git-lfs-freebsd-amd64 : $(SOURCES) mangen
	$(call BUILD,freebsd,amd64,-freebsd-amd64)
bin/git-lfs-freebsd-386 : $(SOURCES) mangen
	$(call BUILD,freebsd,386,-freebsd-386)
bin/git-lfs-windows-amd64.exe : resource.syso $(SOURCES) mangen
	$(call BUILD,windows,amd64,-windows-amd64.exe)
bin/git-lfs-windows-386.exe : resource.syso $(SOURCES) mangen
	$(call BUILD,windows,386,-windows-386.exe)

# .DEFAULT_GOAL sets the operating system-appropriate Git LFS binary as the
# default output of 'make'.
.DEFAULT_GOAL := bin/git-lfs$(X)

# bin/git-lfs targets the default output of Git LFS on non-Windows operating
# systems, and respects the build knobs as above.
bin/git-lfs : $(SOURCES) fmt mangen
	$(call BUILD,$(GOOS),$(GOARCH),)

# bin/git-lfs.exe targets the default output of Git LFS on Windows systems, and
# respects the build knobs as above.
bin/git-lfs.exe : $(SOURCES) resource.syso mangen
	$(call BUILD,$(GOOS),$(GOARCH),.exe)

# resource.syso installs the 'goversioninfo' command and uses it in order to
# generate a binary that has information included necessary to create the
# Windows installer.
#
# Generating a new resource.syso is a pure function of the contents in the
# prerequisites listed below.
resource.syso : \
versioninfo.json script/windows-installer/git-lfs-logo.bmp \
script/windows-installer/git-lfs-logo.ico \
script/windows-installer/git-lfs-wizard-image.bmp
	@$(GO) get github.com/josephspurrier/goversioninfo/cmd/goversioninfo
	$(GO) generate

# RELEASE_TARGETS is the set of all release artifacts that we generate over a
# particular release. They each have a corresponding entry in BUILD_TARGETS as
# above.
#
# Unlike BUILD_TARGETS above, each of the below create a compressed directory
# containing the matching binary, as well as the contents of RELEASE_INCLUDES
# below.
#
# To build a specific release, execute the following:
#
# 	make bin/releases/git-lfs-darwin-amd64-$(git describe HEAD).tar.gz
#
# To build a specific release with a custom VERSION suffix, run the following:
#
# 	make VERSION=my-version bin/releases/git-lfs-darwin-amd64-my-version.tar.gz
RELEASE_TARGETS = bin/releases/git-lfs-darwin-amd64-$(VERSION).tar.gz \
	bin/releases/git-lfs-darwin-386-$(VERSION).tar.gz \
	bin/releases/git-lfs-linux-amd64-$(VERSION).tar.gz \
	bin/releases/git-lfs-linux-386-$(VERSION).tar.gz \
	bin/releases/git-lfs-freebsd-amd64-$(VERSION).tar.gz \
	bin/releases/git-lfs-freebsd-386-$(VERSION).tar.gz \
	bin/releases/git-lfs-windows-amd64-$(VERSION).zip \
	bin/releases/git-lfs-windows-386-$(VERSION).zip

# RELEASE_INCLUDES are the names of additional files that are added to each
# release artifact.
RELEASE_INCLUDES = README.md CHANGELOG.md

# release is a phony target that builds all of the release artifacts, and then
# shows the SHA 256 signature of each.
#
# To build all of the release binaries for a given Git LFS release:
#
# 	make release
.PHONY : release
release : $(RELEASE_TARGETS)
	shasum -a 256 $(RELEASE_TARGETS)

# bin/releases/git-lfs-%-$(VERSION).tar.gz generates a gzip-compressed TAR of
# the non-Windows release artifacts.
#
# It includes all of RELEASE_INCLUDES, as well as script/install.sh.
bin/releases/git-lfs-%-$(VERSION).tar.gz : \
$(RELEASE_INCLUDES) bin/git-lfs-% script/install.sh
	@mkdir -p bin/releases
	tar -s '!bin/git-lfs-.*!git-lfs!' -s '!script/!!' -czf $@ $^

# bin/releases/git-lfs-%-$(VERSION).zip generates a ZIP compression of all of
# the Windows release artifacts.
#
# It includes all of the RELEASE_INCLUDES, and converts LF-style line endings to
# CRLF in the non-binary components of the artifact.
bin/releases/git-lfs-%-$(VERSION).zip : $(RELEASE_INCLUDES) bin/git-lfs-%.exe
	@mkdir -p bin/releases
	zip -j -l $@ $^

# TEST_TARGETS is a list of all phony test targets. Each one of them corresponds
# to a specific kind or subset of tests to run.
TEST_TARGETS := test-bench test-verbose test-race
.PHONY : $(TEST_TARGETS) test
$(TEST_TARGETS) : test

# test-bench runs all Go benchmark tests, and nothing more.
test-bench : GO_TEST_EXTRA_ARGS=-run=__nothing__ -bench=.
# test-verbose runs all Go tests in verbose mode.
test-verbose : GO_TEST_EXTRA_ARGS=-v
# test-race runs all Go tests in race-detection mode.
test-race : GO_TEST_EXTRA_ARGS=-race

# test runs the Go tests with GO_TEST_EXTRA_ARGS in all specified packages,
# given by the PKGS variable.
#
# For example, a caller can invoke the race-detection tests in just the config
# package by running:
#
# 		make PKGS=config test-race
#
# Or in a series of packages, like:
#
# 		make PKGS="config lfsapi tools/kv" test-race
#
# And so on.
test : fmt
	$(GO) test $(GO_TEST_EXTRA_ARGS) $(addprefix ./,$(PKGS))

# integration is a shorthand for running 'make' in the 't' directory.
.PHONY : integration
integration : bin/git-lfs$(X)
	make -C t test

# glide.lock is the permanent record of the glide.yaml file, and it is built by
# running 'glide update'.
glide.lock : glide.yaml
	$(GLIDE) update

# vendor updates the glide.lock-file, and installs vendored dependencies into
# the vendor/ sub-tree, removing sub-packages (listed below) that are unused by
# Git LFS.
.PHONY : vendor
vendor : glide.lock
	$(GLIDE) install
	$(RM) -r vendor/github.com/ThomsonReutersEikon/go-ntlm/utils
	$(RM) -r vendor/github.com/davecgh/go-spew
	$(RM) -r vendor/github.com/pmezard/go-difflib

# fmt runs goimports over all files in Git LFS (as defined by $(SOURCES) above),
# and replaces their contents with a formatted one in-place.
#
# If $(GOIMPORTS) does not exist, or isn't otherwise executable, this recipe
# still performs the linting sequence, but gracefully skips over running a
# non-existent command.
.PHONY : fmt
ifeq ($(shell test -x "`which $(GOIMPORTS)`"; echo $$?),0)
fmt : $(SOURCES) | lint
	@$(GOIMPORTS) $(GOIMPORTS_EXTRA_OPTS) $?;
else
fmt : $(SOURCES) | lint
	@echo "git-lfs: skipping fmt, no goimports found at \`$(GOIMPORTS)\` ..."
endif

# lint ensures that there are all dependencies outside of the standard library
# are vendored in via vendor (see: above).
.PHONY : lint
lint : $(SOURCES)
	@$(GO) list -f '{{ join .Deps "\n" }}' . \
	| $(XARGS) $(GO) list -f '{{ if not .Standard }}{{ .ImportPath }}{{ end }}' \
	| $(GREP) -v "github.com/git-lfs/git-lfs" || exit 0

# MAN_ROFF_TARGETS is a list of all ROFF-style targets in the man pages.
MAN_ROFF_TARGETS = man/git-lfs-checkout.1 \
  man/git-lfs-clean.1 \
  man/git-lfs-clone.1 \
  man/git-lfs-config.5 \
  man/git-lfs-env.1 \
  man/git-lfs-ext.1 \
  man/git-lfs-fetch.1 \
  man/git-lfs-filter-process.1 \
  man/git-lfs-fsck.1 \
  man/git-lfs-install.1 \
  man/git-lfs-lock.1 \
  man/git-lfs-locks.1 \
  man/git-lfs-logs.1 \
  man/git-lfs-ls-files.1 \
  man/git-lfs-migrate.1 \
  man/git-lfs-pointer.1 \
  man/git-lfs-post-checkout.1 \
  man/git-lfs-post-merge.1 \
  man/git-lfs-pre-push.1 \
  man/git-lfs-prune.1 \
  man/git-lfs-pull.1 \
  man/git-lfs-push.1 \
  man/git-lfs-smudge.1 \
  man/git-lfs-status.1 \
  man/git-lfs-track.1 \
  man/git-lfs-uninstall.1 \
  man/git-lfs-unlock.1 \
  man/git-lfs-untrack.1 \
  man/git-lfs-update.1 \
  man/git-lfs.1

# MAN_HTML_TARGETS is a list of all HTML-style targets in the man pages.
MAN_HTML_TARGETS = man/git-lfs-checkout.1.html \
  man/git-lfs-clean.1.html \
  man/git-lfs-clone.1.html \
  man/git-lfs-config.5.html \
  man/git-lfs-env.1.html \
  man/git-lfs-ext.1.html \
  man/git-lfs-fetch.1.html \
  man/git-lfs-filter-process.1.html \
  man/git-lfs-fsck.1.html \
  man/git-lfs-install.1.html \
  man/git-lfs-lock.1.html \
  man/git-lfs-locks.1.html \
  man/git-lfs-logs.1.html \
  man/git-lfs-ls-files.1.html \
  man/git-lfs-migrate.1.html \
  man/git-lfs-pointer.1.html \
  man/git-lfs-post-checkout.1.html \
  man/git-lfs-post-merge.1.html \
  man/git-lfs-pre-push.1.html \
  man/git-lfs-prune.1.html \
  man/git-lfs-pull.1.html \
  man/git-lfs-push.1.html \
  man/git-lfs-smudge.1.html \
  man/git-lfs-status.1.html \
  man/git-lfs-track.1.html \
  man/git-lfs-uninstall.1.html \
  man/git-lfs-unlock.1.html \
  man/git-lfs-untrack.1.html \
  man/git-lfs-update.1.html \
  man/git-lfs.1.html

# man generates all ROFF- and HTML-style manpage targets.
.PHONY : man
man : $(MAN_ROFF_TARGETS) $(MAN_HTML_TARGETS)

# man/% generates ROFF-style man pages from the corresponding .ronn file.
man/% : docs/man/%.ronn
	@mkdir -p man
	$(RONN) $(RONN_EXTRA_ARGS) -r --pipe < $^ > $@

# man/%.html generates HTML-style man pages from the corresponding .ronn file.
man/%.html : docs/man/%.ronn
	@mkdir -p man
	$(RONN) $(RONN_EXTRA_ARGS) -5 --pipe < $^ > $@