erlang.mk

# Copyright (c) 2013-2016, Loïc Hoguin <essen@ninenines.eu>
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

.PHONY: all app apps deps search rel relup docs install-docs check tests clean distclean help erlang-mk

ERLANG_MK_FILENAME := $(realpath $(lastword $(MAKEFILE_LIST)))

ERLANG_MK_VERSION = 2017.04.25-6-g5922969

# Make 3.81 and 3.82 are deprecated.

#ifeq ($(MAKE_VERSION),3.81)
#$(warning Please upgrade to GNU Make 4 or later: https://erlang.mk/guide/installation.html)
#endif

#ifeq ($(MAKE_VERSION),3.82)
#$(warning Please upgrade to GNU Make 4 or later: https://erlang.mk/guide/installation.html)
#endif

# Core configuration.

PROJECT ?= $(notdir $(CURDIR))
PROJECT := $(strip $(PROJECT))

PROJECT_VERSION ?= rolling
PROJECT_MOD ?= $(PROJECT)_app
PROJECT_ENV ?= []

# Verbosity.

V ?= 0

verbose_0 = @
verbose_2 = set -x;
verbose = $(verbose_$(V))

gen_verbose_0 = @echo " GEN   " $@;
gen_verbose_2 = set -x;
gen_verbose = $(gen_verbose_$(V))

# Temporary files directory.

ERLANG_MK_TMP ?= $(CURDIR)/.erlang.mk
export ERLANG_MK_TMP

# "erl" command.

ERL = erl +A0 -noinput -boot start_clean

# Platform detection.

ifeq ($(PLATFORM),)
UNAME_S := $(shell uname -s)

ifeq ($(UNAME_S),Linux)
PLATFORM = linux
else ifeq ($(UNAME_S),Darwin)
PLATFORM = darwin
else ifeq ($(UNAME_S),SunOS)
PLATFORM = solaris
else ifeq ($(UNAME_S),GNU)
PLATFORM = gnu
else ifeq ($(UNAME_S),FreeBSD)
PLATFORM = freebsd
else ifeq ($(UNAME_S),NetBSD)
PLATFORM = netbsd
else ifeq ($(UNAME_S),OpenBSD)
PLATFORM = openbsd
else ifeq ($(UNAME_S),DragonFly)
PLATFORM = dragonfly
else ifeq ($(shell uname -o),Msys)
PLATFORM = msys2
else
$(error Unable to detect platform. Please open a ticket with the output of uname -a.)
endif

export PLATFORM
endif

# Core targets.

all:: deps app rel

# Noop to avoid a Make warning when there's nothing to do.
rel::
	$(verbose) :

relup:: deps app

check:: tests

clean:: clean-crashdump

clean-crashdump:
ifneq ($(wildcard erl_crash.dump),)
	$(gen_verbose) rm -f erl_crash.dump
endif

distclean:: clean distclean-tmp

distclean-tmp:
	$(gen_verbose) rm -rf $(ERLANG_MK_TMP)

help::
	$(verbose) printf "%s\n" \
		"erlang.mk (version $(ERLANG_MK_VERSION)) is distributed under the terms of the ISC License." \
		"Copyright (c) 2013-2016 Loïc Hoguin <essen@ninenines.eu>" \
		"" \
		"Usage: [V=1] $(MAKE) [target]..." \
		"" \
		"Core targets:" \
		"  all           Run deps, app and rel targets in that order" \
		"  app           Compile the project" \
		"  deps          Fetch dependencies (if needed) and compile them" \
		"  fetch-deps    Fetch dependencies recursively (if needed) without compiling them" \
		"  list-deps     List dependencies recursively on stdout" \
		"  search q=...  Search for a package in the built-in index" \
		"  rel           Build a release for this project, if applicable" \
		"  docs          Build the documentation for this project" \
		"  install-docs  Install the man pages for this project" \
		"  check         Compile and run all tests and analysis for this project" \
		"  tests         Run the tests for this project" \
		"  clean         Delete temporary and output files from most targets" \
		"  distclean     Delete all temporary and output files" \
		"  help          Display this help and exit" \
		"  erlang-mk     Update erlang.mk to the latest version"

# Core functions.

empty :=
space := $(empty) $(empty)
tab := $(empty)	$(empty)
comma := ,

define newline


endef

define comma_list
$(subst $(space),$(comma),$(strip $(1)))
endef

# Adding erlang.mk to make Erlang scripts who call init:get_plain_arguments() happy.
define erlang
$(ERL) $(2) -pz $(ERLANG_MK_TMP)/rebar/ebin -eval "$(subst $(newline),,$(subst ",\",$(1)))" -- erlang.mk
endef

ifeq ($(PLATFORM),msys2)
core_native_path = $(subst \,\\\\,$(shell cygpath -w $1))
else
core_native_path = $1
endif

core_http_get = curl -Lf$(if $(filter-out 0,$(V)),,s)o $(call core_native_path,$1) $2

core_eq = $(and $(findstring $(1),$(2)),$(findstring $(2),$(1)))

core_find = $(if $(wildcard $1),$(shell find $(1:%/=%) -type f -name $(subst *,\*,$2)))

core_lc = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$(1)))))))))))))))))))))))))))

core_ls = $(filter-out $(1),$(shell echo $(1)))

# @todo Use a solution that does not require using perl.
core_relpath = $(shell perl -e 'use File::Spec; print File::Spec->abs2rel(@ARGV) . "\n"' $1 $2)

# Automated update.

ERLANG_MK_REPO ?= https://github.com/ninenines/erlang.mk
ERLANG_MK_COMMIT ?=
ERLANG_MK_BUILD_CONFIG ?= build.config
ERLANG_MK_BUILD_DIR ?= .erlang.mk.build

erlang-mk:
	git clone $(ERLANG_MK_REPO) $(ERLANG_MK_BUILD_DIR)
ifdef ERLANG_MK_COMMIT
	cd $(ERLANG_MK_BUILD_DIR) && git checkout $(ERLANG_MK_COMMIT)
endif
	if [ -f $(ERLANG_MK_BUILD_CONFIG) ]; then cp $(ERLANG_MK_BUILD_CONFIG) $(ERLANG_MK_BUILD_DIR)/build.config; fi
	$(MAKE) -C $(ERLANG_MK_BUILD_DIR)
	cp $(ERLANG_MK_BUILD_DIR)/erlang.mk ./erlang.mk
	rm -rf $(ERLANG_MK_BUILD_DIR)

# The erlang.mk package index is bundled in the default erlang.mk build.
# Search for the string "copyright" to skip to the rest of the code.

# Copyright (c) 2013-2016, Loïc Hoguin <essen@ninenines.eu>
# This file is part of erlang.mk and subject to the terms of the ISC License.

.PHONY: clean-app

# Configuration.

ERLC_OPTS ?= -Werror +debug_info +warn_export_vars +warn_shadow_vars \
	+warn_obsolete_guard # +bin_opt_info +warn_export_all +warn_missing_spec
COMPILE_FIRST ?=
COMPILE_FIRST_PATHS = $(addprefix src/,$(addsuffix .erl,$(COMPILE_FIRST)))
ERLC_EXCLUDE ?=
ERLC_EXCLUDE_PATHS = $(addprefix src/,$(addsuffix .erl,$(ERLC_EXCLUDE)))

ERLC_ASN1_OPTS ?=

ERLC_MIB_OPTS ?=
COMPILE_MIB_FIRST ?=
COMPILE_MIB_FIRST_PATHS = $(addprefix mibs/,$(addsuffix .mib,$(COMPILE_MIB_FIRST)))

# Verbosity.

app_verbose_0 = @echo " APP   " $(PROJECT);
app_verbose_2 = set -x;
app_verbose = $(app_verbose_$(V))

appsrc_verbose_0 = @echo " APP   " $(PROJECT).app.src;
appsrc_verbose_2 = set -x;
appsrc_verbose = $(appsrc_verbose_$(V))

makedep_verbose_0 = @echo " DEPEND" $(PROJECT).d;
makedep_verbose_2 = set -x;
makedep_verbose = $(makedep_verbose_$(V))

erlc_verbose_0 = @echo " ERLC  " $(filter-out $(patsubst %,%.erl,$(ERLC_EXCLUDE)),\
	$(filter %.erl %.core,$(?F)));
erlc_verbose_2 = set -x;
erlc_verbose = $(erlc_verbose_$(V))

xyrl_verbose_0 = @echo " XYRL  " $(filter %.xrl %.yrl,$(?F));
xyrl_verbose_2 = set -x;
xyrl_verbose = $(xyrl_verbose_$(V))

asn1_verbose_0 = @echo " ASN1  " $(filter %.asn1,$(?F));
asn1_verbose_2 = set -x;
asn1_verbose = $(asn1_verbose_$(V))

mib_verbose_0 = @echo " MIB   " $(filter %.bin %.mib,$(?F));
mib_verbose_2 = set -x;
mib_verbose = $(mib_verbose_$(V))

ifneq ($(wildcard src/),)

# Targets.

ifeq ($(wildcard ebin/test),)
app:: deps $(PROJECT).d
	$(verbose) $(MAKE) --no-print-directory app-build
else
app:: clean deps $(PROJECT).d
	$(verbose) $(MAKE) --no-print-directory app-build
endif

ifeq ($(wildcard src/$(PROJECT_MOD).erl),)
define app_file
{application, '$(PROJECT)', [
	{description, "$(PROJECT_DESCRIPTION)"},
	{vsn, "$(PROJECT_VERSION)"},$(if $(IS_DEP),
	{id$(comma)$(space)"$(1)"}$(comma))
	{modules, [$(call comma_list,$(2))]},
	{registered, []},
	{applications, [$(call comma_list,kernel stdlib $(OTP_DEPS) $(LOCAL_DEPS) $(DEPS))]},
	{env, $(subst \,\\,$(PROJECT_ENV))}$(if $(findstring {,$(PROJECT_APP_EXTRA_KEYS)),$(comma)$(newline)$(tab)$(subst \,\\,$(PROJECT_APP_EXTRA_KEYS)),)
]}.
endef
else
define app_file
{application, '$(PROJECT)', [
	{description, "$(PROJECT_DESCRIPTION)"},
	{vsn, "$(PROJECT_VERSION)"},$(if $(IS_DEP),
	{id$(comma)$(space)"$(1)"}$(comma))
	{modules, [$(call comma_list,$(2))]},
	{registered, [$(call comma_list,$(PROJECT)_sup $(PROJECT_REGISTERED))]},
	{applications, [$(call comma_list,kernel stdlib $(OTP_DEPS) $(LOCAL_DEPS) $(DEPS))]},
	{mod, {$(PROJECT_MOD), []}},
	{env, $(subst \,\\,$(PROJECT_ENV))}$(if $(findstring {,$(PROJECT_APP_EXTRA_KEYS)),$(comma)$(newline)$(tab)$(subst \,\\,$(PROJECT_APP_EXTRA_KEYS)),)
]}.
endef
endif

app-build: ebin/$(PROJECT).app
	$(verbose) :

# Source files.

ALL_SRC_FILES := $(sort $(call core_find,src/,*))

ERL_FILES := $(filter %.erl,$(ALL_SRC_FILES))
CORE_FILES := $(filter %.core,$(ALL_SRC_FILES))

# ASN.1 files.

ifneq ($(wildcard asn1/),)
ASN1_FILES = $(sort $(call core_find,asn1/,*.asn1))
ERL_FILES += $(addprefix src/,$(patsubst %.asn1,%.erl,$(notdir $(ASN1_FILES))))

define compile_asn1
	$(verbose) mkdir -p include/
	$(asn1_verbose) erlc -v -I include/ -o asn1/ +noobj $(ERLC_ASN1_OPTS) $(1)
	$(verbose) mv asn1/*.erl src/
	$(verbose) mv asn1/*.hrl include/
	$(verbose) mv asn1/*.asn1db include/
endef

$(PROJECT).d:: $(ASN1_FILES)
	$(if $(strip $?),$(call compile_asn1,$?))
endif

# SNMP MIB files.

ifneq ($(wildcard mibs/),)
MIB_FILES = $(sort $(call core_find,mibs/,*.mib))

$(PROJECT).d:: $(COMPILE_MIB_FIRST_PATHS) $(MIB_FILES)
	$(verbose) mkdir -p include/ priv/mibs/
	$(mib_verbose) erlc -v $(ERLC_MIB_OPTS) -o priv/mibs/ -I priv/mibs/ $?
	$(mib_verbose) erlc -o include/ -- $(addprefix priv/mibs/,$(patsubst %.mib,%.bin,$(notdir $?)))
endif

# Leex and Yecc files.

XRL_FILES := $(filter %.xrl,$(ALL_SRC_FILES))
XRL_ERL_FILES = $(addprefix src/,$(patsubst %.xrl,%.erl,$(notdir $(XRL_FILES))))
ERL_FILES += $(XRL_ERL_FILES)

YRL_FILES := $(filter %.yrl,$(ALL_SRC_FILES))
YRL_ERL_FILES = $(addprefix src/,$(patsubst %.yrl,%.erl,$(notdir $(YRL_FILES))))
ERL_FILES += $(YRL_ERL_FILES)

$(PROJECT).d:: $(XRL_FILES) $(YRL_FILES)
	$(if $(strip $?),$(xyrl_verbose) erlc -v -o src/ $(YRL_ERLC_OPTS) $?)

# Erlang and Core Erlang files.

define makedep.erl
	E = ets:new(makedep, [bag]),
	G = digraph:new([acyclic]),
	ErlFiles = lists:usort(string:tokens("$(ERL_FILES)", " ")),
	Modules = [{list_to_atom(filename:basename(F, ".erl")), F} || F <- ErlFiles],
	Add = fun (Mod, Dep) ->
		case lists:keyfind(Dep, 1, Modules) of
			false -> ok;
			{_, DepFile} ->
				{_, ModFile} = lists:keyfind(Mod, 1, Modules),
				ets:insert(E, {ModFile, DepFile}),
				digraph:add_vertex(G, Mod),
				digraph:add_vertex(G, Dep),
				digraph:add_edge(G, Mod, Dep)
		end
	end,
	AddHd = fun (F, Mod, DepFile) ->
		case file:open(DepFile, [read]) of
			{error, enoent} -> ok;
			{ok, Fd} ->
				F(F, Fd, Mod),
				{_, ModFile} = lists:keyfind(Mod, 1, Modules),
				ets:insert(E, {ModFile, DepFile})
		end
	end,
	Attr = fun
		(F, Mod, behavior, Dep) -> Add(Mod, Dep);
		(F, Mod, behaviour, Dep) -> Add(Mod, Dep);
		(F, Mod, compile, {parse_transform, Dep}) -> Add(Mod, Dep);
		(F, Mod, compile, Opts) when is_list(Opts) ->
			case proplists:get_value(parse_transform, Opts) of
				undefined -> ok;
				Dep -> Add(Mod, Dep)
			end;
		(F, Mod, include, Hrl) ->
			case filelib:is_file("include/" ++ Hrl) of
				true -> AddHd(F, Mod, "include/" ++ Hrl);
				false ->
					case filelib:is_file("src/" ++ Hrl) of
						true -> AddHd(F, Mod, "src/" ++ Hrl);
						false -> false
					end
			end;
		(F, Mod, include_lib, "$1/include/" ++ Hrl) -> AddHd(F, Mod, "include/" ++ Hrl);
		(F, Mod, include_lib, Hrl) -> AddHd(F, Mod, "include/" ++ Hrl);
		(F, Mod, import, {Imp, _}) ->
			IsFile =
				case lists:keyfind(Imp, 1, Modules) of
					false -> false;
					{_, FilePath} -> filelib:is_file(FilePath)
				end,
			case IsFile of
				false -> ok;
				true -> Add(Mod, Imp)
			end;
		(_, _, _, _) -> ok
	end,
	MakeDepend = fun(F, Fd, Mod) ->
		case io:parse_erl_form(Fd, undefined) of
			{ok, {attribute, _, Key, Value}, _} ->
				Attr(F, Mod, Key, Value),
				F(F, Fd, Mod);
			{eof, _} ->
				file:close(Fd);
			_ ->
				F(F, Fd, Mod)
		end
	end,
	[begin
		Mod = list_to_atom(filename:basename(F, ".erl")),
		{ok, Fd} = file:open(F, [read]),
		MakeDepend(MakeDepend, Fd, Mod)
	end || F <- ErlFiles],
	Depend = sofs:to_external(sofs:relation_to_family(sofs:relation(ets:tab2list(E)))),
	CompileFirst = [X || X <- lists:reverse(digraph_utils:topsort(G)), [] =/= digraph:in_neighbours(G, X)],
	TargetPath = fun(Target) ->
		case lists:keyfind(Target, 1, Modules) of
			false -> "";
			{_, DepFile} ->
				DirSubname = tl(string:tokens(filename:dirname(DepFile), "/")),
				string:join(DirSubname ++ [atom_to_list(Target)], "/")
		end
	end,
	ok = file:write_file("$(1)", [
		[[F, "::", [[" ", D] || D <- Deps], "; @touch \$$@\n"] || {F, Deps} <- Depend],
		"\nCOMPILE_FIRST +=", [[" ", TargetPath(CF)] || CF <- CompileFirst], "\n"
	]),
	halt()
endef

ifeq ($(if $(NO_MAKEDEP),$(wildcard $(PROJECT).d),),)
$(PROJECT).d:: $(ERL_FILES) $(call core_find,include/,*.hrl) $(MAKEFILE_LIST)
	$(makedep_verbose) $(call erlang,$(call makedep.erl,$@))
endif

ifneq ($(words $(ERL_FILES) $(CORE_FILES) $(ASN1_FILES) $(MIB_FILES) $(XRL_FILES) $(YRL_FILES)),0)
# Rebuild everything when the Makefile changes.
$(ERLANG_MK_TMP)/last-makefile-change: $(MAKEFILE_LIST)
	$(verbose) mkdir -p $(ERLANG_MK_TMP)
	$(verbose) if test -f $@; then \
		touch $(ERL_FILES) $(CORE_FILES) $(ASN1_FILES) $(MIB_FILES) $(XRL_FILES) $(YRL_FILES); \
		touch -c $(PROJECT).d; \
	fi
	$(verbose) touch $@

$(ERL_FILES) $(CORE_FILES) $(ASN1_FILES) $(MIB_FILES) $(XRL_FILES) $(YRL_FILES):: $(ERLANG_MK_TMP)/last-makefile-change
ebin/$(PROJECT).app:: $(ERLANG_MK_TMP)/last-makefile-change
endif

include $(wildcard $(PROJECT).d)

ebin/$(PROJECT).app:: ebin/

ebin/:
	$(verbose) mkdir -p ebin/

define compile_erl
	$(erlc_verbose) erlc -v $(if $(IS_DEP),$(filter-out -Werror,$(ERLC_OPTS)),$(ERLC_OPTS)) -o ebin/ \
		-pa ebin/ -I include/ $(filter-out $(ERLC_EXCLUDE_PATHS),$(COMPILE_FIRST_PATHS) $(1))
endef

ebin/$(PROJECT).app:: $(ERL_FILES) $(CORE_FILES) $(wildcard src/$(PROJECT).app.src)
	$(eval FILES_TO_COMPILE := $(filter-out src/$(PROJECT).app.src,$?))
	$(if $(strip $(FILES_TO_COMPILE)),$(call compile_erl,$(FILES_TO_COMPILE)))
	$(eval GITDESCRIBE := $(shell git describe --dirty --abbrev=7 --tags --always --first-parent 2>/dev/null || true))
	$(eval MODULES := $(patsubst %,'%',$(sort $(notdir $(basename \
		$(filter-out $(ERLC_EXCLUDE_PATHS),$(ERL_FILES) $(CORE_FILES) $(BEAM_FILES)))))))
ifeq ($(wildcard src/$(PROJECT).app.src),)
	$(app_verbose) printf '$(subst %,%%,$(subst $(newline),\n,$(subst ','\'',$(call app_file,$(GITDESCRIBE),$(MODULES)))))' \
		> ebin/$(PROJECT).app
else
	$(verbose) if [ -z "$$(grep -e '^[^%]*{\s*modules\s*,' src/$(PROJECT).app.src)" ]; then \
		echo "Empty modules entry not found in $(PROJECT).app.src. Please consult the erlang.mk README for instructions." >&2; \
		exit 1; \
	fi
	$(appsrc_verbose) cat src/$(PROJECT).app.src \
		| sed "s/{[[:space:]]*modules[[:space:]]*,[[:space:]]*\[\]}/{modules, \[$(call comma_list,$(MODULES))\]}/" \
		| sed "s/{id,[[:space:]]*\"git\"}/{id, \"$(subst /,\/,$(GITDESCRIBE))\"}/" \
		> ebin/$(PROJECT).app
endif

clean:: clean-app

clean-app:
	$(gen_verbose) rm -rf $(PROJECT).d ebin/ priv/mibs/ $(XRL_ERL_FILES) $(YRL_ERL_FILES) \
		$(addprefix include/,$(patsubst %.mib,%.hrl,$(notdir $(MIB_FILES)))) \
		$(addprefix include/,$(patsubst %.asn1,%.hrl,$(notdir $(ASN1_FILES)))) \
		$(addprefix include/,$(patsubst %.asn1,%.asn1db,$(notdir $(ASN1_FILES)))) \
		$(addprefix src/,$(patsubst %.asn1,%.erl,$(notdir $(ASN1_FILES))))

endif

# Copyright (c) 2016, Loïc Hoguin <essen@ninenines.eu>
# Copyright (c) 2015, Viktor Söderqvist <viktor@zuiderkwast.se>
# This file is part of erlang.mk and subject to the terms of the ISC License.

.PHONY: docs-deps

# Configuration.

ALL_DOC_DEPS_DIRS = $(addprefix $(DEPS_DIR)/,$(DOC_DEPS))

# Targets.

$(foreach dep,$(DOC_DEPS),$(eval $(call dep_target,$(dep))))

ifneq ($(SKIP_DEPS),)
doc-deps:
else
doc-deps: $(ALL_DOC_DEPS_DIRS)
	$(verbose) for dep in $(ALL_DOC_DEPS_DIRS) ; do $(MAKE) -C $$dep; done
endif

# Copyright (c) 2015-2016, Loïc Hoguin <essen@ninenines.eu>
# This file is part of erlang.mk and subject to the terms of the ISC License.

.PHONY: rebar.config

# We strip out -Werror because we don't want to fail due to
# warnings when used as a dependency.

compat_prepare_erlc_opts = $(shell echo "$1" | sed 's/, */,/g')

define compat_convert_erlc_opts
$(if $(filter-out -Werror,$1),\
	$(if $(findstring +,$1),\
		$(shell echo $1 | cut -b 2-)))
endef

define compat_erlc_opts_to_list
[$(call comma_list,$(foreach o,$(call compat_prepare_erlc_opts,$1),$(call compat_convert_erlc_opts,$o)))]
endef

define compat_rebar_config
{deps, [
$(call comma_list,$(foreach d,$(DEPS),\
	$(if $(filter hex,$(call dep_fetch,$d)),\
		{$(call dep_name,$d)$(comma)"$(call dep_repo,$d)"},\
		{$(call dep_name,$d)$(comma)".*"$(comma){git,"$(call dep_repo,$d)"$(comma)"$(call dep_commit,$d)"}})))
]}.
{erl_opts, $(call compat_erlc_opts_to_list,$(ERLC_OPTS))}.
endef

$(eval _compat_rebar_config = $$(compat_rebar_config))
$(eval export _compat_rebar_config)

rebar.config:
	$(gen_verbose) echo "$${_compat_rebar_config}" > rebar.config

# Copyright (c) 2014-2016, Loïc Hoguin <essen@ninenines.eu>
# This file is part of erlang.mk and subject to the terms of the ISC License.

.PHONY: clean-c_src distclean-c_src-env

# Configuration.

C_SRC_DIR ?= $(CURDIR)/c_src
C_SRC_ENV ?= $(C_SRC_DIR)/env.mk
C_SRC_OUTPUT ?= $(CURDIR)/priv/$(PROJECT)
C_SRC_TYPE ?= shared

# System type and C compiler/flags.

ifeq ($(PLATFORM),msys2)
	C_SRC_OUTPUT_EXECUTABLE_EXTENSION ?= .exe
	C_SRC_OUTPUT_SHARED_EXTENSION ?= .dll
else
	C_SRC_OUTPUT_EXECUTABLE_EXTENSION ?=
	C_SRC_OUTPUT_SHARED_EXTENSION ?= .so
endif

ifeq ($(C_SRC_TYPE),shared)
	C_SRC_OUTPUT_FILE = $(C_SRC_OUTPUT)$(C_SRC_OUTPUT_SHARED_EXTENSION)
else
	C_SRC_OUTPUT_FILE = $(C_SRC_OUTPUT)$(C_SRC_OUTPUT_EXECUTABLE_EXTENSION)
endif

ifeq ($(PLATFORM),msys2)
# We hardcode the compiler used on MSYS2. The default CC=cc does
# not produce working code. The "gcc" MSYS2 package also doesn't.
	CC = /mingw64/bin/gcc
	export CC
	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -finline-functions -Wall
else ifeq ($(PLATFORM),darwin)
	CC ?= cc
	CFLAGS ?= -O3 -std=c99 -arch x86_64 -finline-functions -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -arch x86_64 -finline-functions -Wall
	LDFLAGS ?= -arch x86_64 -flat_namespace -undefined suppress
else ifeq ($(PLATFORM),freebsd)
	CC ?= cc
	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -finline-functions -Wall
else ifeq ($(PLATFORM),linux)
	CC ?= gcc
	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -finline-functions -Wall
endif

ifneq ($(PLATFORM),msys2)
	CFLAGS += -fPIC
	CXXFLAGS += -fPIC
endif

CFLAGS += -I"$(ERTS_INCLUDE_DIR)" -I"$(ERL_INTERFACE_INCLUDE_DIR)"
CXXFLAGS += -I"$(ERTS_INCLUDE_DIR)" -I"$(ERL_INTERFACE_INCLUDE_DIR)"

LDLIBS += -L"$(ERL_INTERFACE_LIB_DIR)" -lerl_interface -lei

# Verbosity.

c_verbose_0 = @echo " C     " $(?F);
c_verbose = $(c_verbose_$(V))

cpp_verbose_0 = @echo " CPP   " $(?F);
cpp_verbose = $(cpp_verbose_$(V))

link_verbose_0 = @echo " LD    " $(@F);
link_verbose = $(link_verbose_$(V))

# Targets.

ifeq ($(wildcard $(C_SRC_DIR)),)
else ifneq ($(wildcard $(C_SRC_DIR)/Makefile),)
app:: app-c_src

test-build:: app-c_src

app-c_src:
	$(MAKE) -C $(C_SRC_DIR)

clean::
	$(MAKE) -C $(C_SRC_DIR) clean

else

ifeq ($(SOURCES),)
SOURCES := $(sort $(foreach pat,*.c *.C *.cc *.cpp,$(call core_find,$(C_SRC_DIR)/,$(pat))))
endif
OBJECTS = $(addsuffix .o, $(basename $(SOURCES)))

COMPILE_C = $(c_verbose) $(CC) $(CFLAGS) $(CPPFLAGS) -c
COMPILE_CPP = $(cpp_verbose) $(CXX) $(CXXFLAGS) $(CPPFLAGS) -c

app:: $(C_SRC_ENV) $(C_SRC_OUTPUT_FILE)

test-build:: $(C_SRC_ENV) $(C_SRC_OUTPUT_FILE)

$(C_SRC_OUTPUT_FILE): $(OBJECTS)
	$(verbose) mkdir -p priv/
	$(link_verbose) $(CC) $(OBJECTS) \
		$(LDFLAGS) $(if $(filter $(C_SRC_TYPE),shared),-shared) $(LDLIBS) \
		-o $(C_SRC_OUTPUT_FILE)

%.o: %.c
	$(COMPILE_C) $(OUTPUT_OPTION) $<

%.o: %.cc
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

%.o: %.C
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

%.o: %.cpp
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

clean:: clean-c_src

clean-c_src:
	$(gen_verbose) rm -f $(C_SRC_OUTPUT_FILE) $(OBJECTS)

endif

ifneq ($(wildcard $(C_SRC_DIR)),)
$(C_SRC_ENV):
	$(verbose) $(ERL) -eval "file:write_file(\"$(call core_native_path,$(C_SRC_ENV))\", \
		io_lib:format( \
			\"ERTS_INCLUDE_DIR ?= ~s/erts-~s/include/~n\" \
			\"ERL_INTERFACE_INCLUDE_DIR ?= ~s~n\" \
			\"ERL_INTERFACE_LIB_DIR ?= ~s~n\", \
			[code:root_dir(), erlang:system_info(version), \
			code:lib_dir(erl_interface, include), \
			code:lib_dir(erl_interface, lib)])), \
		halt()."

distclean:: distclean-c_src-env

distclean-c_src-env:
	$(gen_verbose) rm -f $(C_SRC_ENV)

-include $(C_SRC_ENV)
endif

# Templates.

define bs_c_nif
#include "erl_nif.h"

static int loads = 0;

static int load(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
{
	/* Initialize private data. */
	*priv_data = NULL;

	loads++;

	return 0;
}

static int upgrade(ErlNifEnv* env, void** priv_data, void** old_priv_data, ERL_NIF_TERM load_info)
{
	/* Convert the private data to the new version. */
	*priv_data = *old_priv_data;

	loads++;

	return 0;
}

static void unload(ErlNifEnv* env, void* priv_data)
{
	if (loads == 1) {
		/* Destroy the private data. */
	}

	loads--;
}

static ERL_NIF_TERM hello(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
	if (enif_is_atom(env, argv[0])) {
		return enif_make_tuple2(env,
			enif_make_atom(env, "hello"),
			argv[0]);
	}

	return enif_make_tuple2(env,
		enif_make_atom(env, "error"),
		enif_make_atom(env, "badarg"));
}

static ErlNifFunc nif_funcs[] = {
	{"hello", 1, hello}
};

ERL_NIF_INIT($n, nif_funcs, load, NULL, upgrade, unload)
endef

define bs_erl_nif
-module($n).

-export([hello/1]).

-on_load(on_load/0).
on_load() ->
	PrivDir = case code:priv_dir(?MODULE) of
		{error, _} ->
			AppPath = filename:dirname(filename:dirname(code:which(?MODULE))),
			filename:join(AppPath, "priv");
		Path ->
			Path
	end,
	erlang:load_nif(filename:join(PrivDir, atom_to_list(?MODULE)), 0).

hello(_) ->
	erlang:nif_error({not_loaded, ?MODULE}).
endef

new-nif:
ifneq ($(wildcard $(C_SRC_DIR)/$n.c),)
	$(error Error: $(C_SRC_DIR)/$n.c already exists)
endif
ifneq ($(wildcard src/$n.erl),)
	$(error Error: src/$n.erl already exists)
endif
ifdef in
	$(verbose) $(MAKE) -C $(APPS_DIR)/$(in)/ new-nif n=$n in=
else
	$(verbose) mkdir -p $(C_SRC_DIR) src/
	$(call render_template,bs_c_nif,$(C_SRC_DIR)/$n.c)
	$(call render_template,bs_erl_nif,src/$n.erl)
endif

# Copyright (c) 2013-2016, Loïc Hoguin <essen@ninenines.eu>
# This file is part of erlang.mk and subject to the terms of the ISC License.

.PHONY: distclean-edoc edoc

# Configuration.

EDOC_OPTS ?=

# Core targets.

ifneq ($(wildcard doc/overview.edoc),)
docs:: edoc
endif

distclean:: distclean-edoc

# Plugin-specific targets.

edoc: distclean-edoc doc-deps
	$(gen_verbose) $(ERL) -eval 'edoc:application($(PROJECT), ".", [$(EDOC_OPTS)]), halt().'

distclean-edoc:
	$(gen_verbose) rm -f doc/*.css doc/*.html doc/*.png doc/edoc-info