# 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)))
export ERLANG_MK_FILENAME

ERLANG_MK_VERSION = rolling
ERLANG_MK_WITHOUT =

# Make 3.81 and 3.82 are deprecated.

ifeq ($(MAKELEVEL)$(MAKE_VERSION),03.81)
$(warning Please upgrade to GNU Make 4 or later: https://erlang.mk/guide/installation.html)
endif

ifeq ($(MAKELEVEL)$(MAKE_VERSION),03.82)
$(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))

ifeq ($(V),3)
SHELL := $(SHELL) -x
endif

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

gen_verbose_esc_0 = @echo " GEN   " $$@;
gen_verbose_esc_2 = set -x;
gen_verbose_esc = $(gen_verbose_esc_$(V))

# Temporary files directory.

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

# "erl" command.

ERL = erl +A1 -noinput -boot no_dot_erlang

# 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

$(ERLANG_MK_TMP):
	$(verbose) mkdir -p $(ERLANG_MK_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

define escape_dquotes
$(subst ",\",$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 $(newline),,$(call escape_dquotes,$1))" -- erlang.mk
endef

ifeq ($(PLATFORM),msys2)
core_native_path = $(shell cygpath -m $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)))

# We skip files that contain spaces because they end up causing issues.
core_find = $(if $(wildcard $1),$(shell find $(1:%/=%) \( -type l -o -type f \) -name $(subst *,\*,$2) | grep -v " "))

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)

define core_render
	printf -- '$(subst $(newline),\n,$(subst %,%%,$(subst ','\'',$(subst $(tab),$(WS),$(call $(1))))))\n' > $(2)
endef

# 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: WITHOUT ?= $(ERLANG_MK_WITHOUT)
erlang-mk:
ifdef ERLANG_MK_COMMIT
	$(verbose) git clone $(ERLANG_MK_REPO) $(ERLANG_MK_BUILD_DIR)
	$(verbose) cd $(ERLANG_MK_BUILD_DIR) && git checkout $(ERLANG_MK_COMMIT)
else
	$(verbose) git clone --depth 1 $(ERLANG_MK_REPO) $(ERLANG_MK_BUILD_DIR)
endif
	$(verbose) if [ -f $(ERLANG_MK_BUILD_CONFIG) ]; then cp $(ERLANG_MK_BUILD_CONFIG) $(ERLANG_MK_BUILD_DIR)/build.config; fi
	$(gen_verbose) $(MAKE) --no-print-directory -C $(ERLANG_MK_BUILD_DIR) WITHOUT='$(strip $(WITHOUT))' UPGRADE=1
	$(verbose) cp $(ERLANG_MK_BUILD_DIR)/erlang.mk ./erlang.mk
	$(verbose) rm -rf $(ERLANG_MK_BUILD_DIR)
	$(verbose) rm -rf $(ERLANG_MK_TMP)

# 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.