Cut erlang.mk into many small components

 *  The build.config says what gets into the generated erlang.mk.
 *  The default erlang.mk in the repository hasn't changed yet.
 *  Clean targets were separated into "clean" and "distclean".
 *  The "help" target was added to display some help message.

I probably broke a couple things...

3 files changed, 227 insertions, 0 deletions

diff --git a/core/core.mk b/core/core.mk
new file mode 100644
index 0000000..caa28d0
--- /dev/null
+++ b/core/core.mk
@@ -0,0 +1,66 @@
+# Copyright (c) 2013-2014, Loïc Hoguin <[email protected]>
+#
+# 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 deps app rel docs tests clean distclean help
+
+ERLANG_MK_VERSION = 1
+
+# Core configuration.
+
+PROJECT ?= $(notdir $(CURDIR))
+
+# Verbosity.
+
+V ?= 0
+
+gen_verbose_0 = @echo " GEN   " $@;
+gen_verbose = $(gen_verbose_$(V))
+
+# Core targets.
+
+all:: deps app rel
+
+clean::
+	$(gen_verbose) rm -f erl_crash.dump
+
+distclean:: clean
+
+help::
+	@printf "%s\n" \
+		"erlang.mk (version $(ERLANG_MK_VERSION)) is distributed under the terms of the ISC License." \
+		"Copyright (c) 2013-2014 Loïc Hoguin <[email protected]>" \
+		"" \
+		"Usage: [V=1] make [target]" \
+		"" \
+		"Core targets:" \
+		"  all         Run deps, app and rel targets in that order" \
+		"  deps        Fetch dependencies (if needed) and compile them" \
+		"  app         Compile the project" \
+		"  rel         Build a release for this project, if applicable" \
+		"  docs        Build the documentation 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" \
+		"" \
+		"The target clean only removes files that are commonly removed." \
+		"Dependencies and releases are left untouched." \
+		"" \
+		"Setting V=1 when calling make enables verbose mode."
+
+# Core functions.
+
+define core_http_get
+	wget --no-check-certificate -O $(1) $(2)|| rm $(1)
+endef
diff --git a/core/deps.mk b/core/deps.mk
new file mode 100644
index 0000000..12bc90c
--- /dev/null
+++ b/core/deps.mk
@@ -0,0 +1,99 @@
+# Copyright (c) 2013-2014, Loïc Hoguin <[email protected]>
+# This file is part of erlang.mk and subject to the terms of the ISC License.
+
+.PHONY: distclean-deps distclean-pkg pkg-list pkg-search
+
+# Configuration.
+
+DEPS_DIR ?= $(CURDIR)/deps
+export DEPS_DIR
+
+REBAR_DEPS_DIR = $(DEPS_DIR)
+export REBAR_DEPS_DIR
+
+ALL_DEPS_DIRS = $(addprefix $(DEPS_DIR)/,$(DEPS))
+
+ifeq ($(filter $(DEPS_DIR),$(subst :, ,$(ERL_LIBS))),)
+ifeq ($(ERL_LIBS),)
+	ERL_LIBS = $(DEPS_DIR)
+else
+	ERL_LIBS := $(ERL_LIBS):$(DEPS_DIR)
+endif
+endif
+export ERL_LIBS
+
+PKG_FILE ?= $(CURDIR)/.erlang.mk.packages.v1
+export PKG_FILE
+
+PKG_FILE_URL ?= https://raw.github.com/extend/erlang.mk/master/packages.v1.tsv
+
+# Core targets.
+
+deps:: $(ALL_DEPS_DIRS)
+	@for dep in $(ALL_DEPS_DIRS) ; do \
+		if [ -f $$dep/Makefile ] ; then \
+			$(MAKE) -C $$dep ; \
+		else \
+			echo "include $(CURDIR)/erlang.mk" | $(MAKE) -f - -C $$dep ; \
+		fi ; \
+	done
+
+distclean:: distclean-deps distclean-pkg
+
+# Deps related targets.
+
+define dep_fetch
+	@mkdir -p $(DEPS_DIR)
+ifeq (,$(findstring pkg://,$(word 1,$(dep_$(1)))))
+	git clone -n -- $(word 1,$(dep_$(1))) $(DEPS_DIR)/$(1)
+else
+	@if [ ! -f $(PKG_FILE) ]; then $(call get_pkg_file); fi
+	git clone -n -- `awk 'BEGIN { FS = "\t" }; \
+		$$$$1 == "$(subst pkg://,,$(word 1,$(dep_$(1))))" { print $$$$2 }' \
+		$(PKG_FILE)` $(DEPS_DIR)/$(1)
+endif
+	cd $(DEPS_DIR)/$(1) ; git checkout -q $(word 2,$(dep_$(1)))
+endef
+
+define dep_target
+$(DEPS_DIR)/$(1):
+	$(call dep_fetch,$(1))
+endef
+
+$(foreach dep,$(DEPS),$(eval $(call dep_target,$(dep))))
+
+distclean-deps:
+	$(gen_verbose) rm -rf $(DEPS_DIR)
+
+# Packages related targets.
+
+$(PKG_FILE):
+	$(call core_http_get,$(PKG_FILE),$(PKG_FILE_URL))
+
+pkg-list: $(PKG_FILE)
+	@cat $(PKG_FILE) | awk 'BEGIN { FS = "\t" }; { print \
+		"Name:\t\t" $$1 "\n" \
+		"Repository:\t" $$2 "\n" \
+		"Website:\t" $$3 "\n" \
+		"Description:\t" $$4 "\n" }'
+
+ifdef q
+pkg-search: $(PKG_FILE)
+	@cat $(PKG_FILE) | grep -i ${q} | awk 'BEGIN { FS = "\t" }; { print \
+		"Name:\t\t" $$1 "\n" \
+		"Repository:\t" $$2 "\n" \
+		"Website:\t" $$3 "\n" \
+		"Description:\t" $$4 "\n" }'
+else
+pkg-search:
+	@echo "Usage: make pkg-search q=STRING"
+endif
+
+distclean-pkg:
+	$(gen_verbose) rm -f $(PKG_FILE)
+
+help::
+	@printf "%s\n" "" \
+		"Package-related targets:" \
+		"  pkg-list              List all known packages" \
+		"  pkg-search q=STRING   Search for STRING in the package index"
diff --git a/core/erlc.mk b/core/erlc.mk
new file mode 100644
index 0000000..cca85ba
--- /dev/null
+++ b/core/erlc.mk
@@ -0,0 +1,62 @@
+# Copyright (c) 2013-2014, Loïc Hoguin <[email protected]>
+# This file is part of erlang.mk and subject to the terms of the ISC License.
+
+.PHONY: clean-app
+
+# Configuration.
+
+ERLC_OPTS ?= -Werror +debug_info +warn_export_all +warn_export_vars \
+	+warn_shadow_vars +warn_obsolete_guard # +bin_opt_info +warn_missing_spec
+COMPILE_FIRST ?=
+COMPILE_FIRST_PATHS = $(addprefix src/,$(addsuffix .erl,$(COMPILE_FIRST)))
+
+# Verbosity.
+
+appsrc_verbose_0 = @echo " APP   " $(PROJECT).app.src;
+appsrc_verbose = $(appsrc_verbose_$(V))
+
+erlc_verbose_0 = @echo " ERLC  " $(filter %.erl %.core,$(?F));
+erlc_verbose = $(erlc_verbose_$(V))
+
+xyrl_verbose_0 = @echo " XYRL  " $(filter %.xrl %.yrl,$(?F));
+xyrl_verbose = $(xyrl_verbose_$(V))
+
+# Core targets.
+
+app:: ebin/$(PROJECT).app
+	$(eval MODULES := $(shell find ebin -type f -name \*.beam \
+		| sed 's/ebin\///;s/\.beam/,/' | sed '$$s/.$$//'))
+	$(appsrc_verbose) cat src/$(PROJECT).app.src \
+		| sed 's/{modules,[[:space:]]*\[\]}/{modules, \[$(MODULES)\]}/' \
+		> ebin/$(PROJECT).app
+
+define compile_erl
+	$(erlc_verbose) erlc -v $(ERLC_OPTS) -o ebin/ \
+		-pa ebin/ -I include/ $(COMPILE_FIRST_PATHS) $(1)
+endef
+
+define compile_xyrl
+	$(xyrl_verbose) erlc -v -o ebin/ $(1)
+	$(xyrl_verbose) erlc $(ERLC_OPTS) -o ebin/ ebin/*.erl
+	@rm ebin/*.erl
+endef
+
+ifneq ($(wildcard src/),)
+ebin/$(PROJECT).app::
+	@mkdir -p ebin/
+
+ebin/$(PROJECT).app:: $(shell find src -type f -name \*.erl) \
+		$(shell find src -type f -name \*.core)
+	$(if $(strip $?),$(call compile_erl,$?))
+
+ebin/$(PROJECT).app:: $(shell find src -type f -name \*.xrl) \
+		$(shell find src -type f -name \*.yrl)
+	$(if $(strip $?),$(call compile_xyrl,$?))
+endif
+
+clean:: clean-app
+
+# Extra targets.
+
+clean-app:
+	$(gen_verbose) rm -rf ebin/