Stop using rebar in the Makefile

First and foremost: yes, you can still use Cowboy as a rebar dependency.
This commit only removes the use of rebar when *developing* Cowboy, not
when *using* Cowboy.

Over the past two years I went from very happy with rebar to unsatisfied
and most recently found it counter productive in many ways, from having
insane default configuration to various unefficient operations. The earlier
reversal from 'rebar ct' to 'ct_run' made my workflow much more natural,
as I always needed to look at 'logs/raw.log' to find out what was wrong,
anyway. Why not let 'ct_run' output it directly instead? Removing rebar
made my life easier.

If you wonder why I don't patch rebar, there's two reasons. First is that
the direction taken by rebar isn't compatible with my views, and this
would be a huge fight to steer it in another direction. I got other,
more important fights to make. Second is that I'd rather patch OTP so
that everyone benefits from it, not just users of rebar.

Anyway this isn't my personal blog so I will stop babbling here. There's
a few important things to note relative to this commit:

 *  You don't need rebar to work on Cowboy anymore
 *  The eunit tests are now ran through common_test

Ping me if it doesn't work out for you.

1 files changed, 30 insertions, 22 deletions

diff --git a/Makefile b/Makefile
index 410dda6..d1441fc 100644
--- a/Makefile
+++ b/Makefile
@@ -1,24 +1,42 @@
 # See LICENSE for licensing information.
 
 PROJECT = cowboy
+RANCH_VSN = 0.6.0
+ERLC_OPTS = -Werror +debug_info +warn_export_all # +bin_opt_info +warn_missing_spec
 
-REBAR = rebar
+.PHONY: all clean-all app clean docs clean-docs tests autobahn build-plt dialyze
+
+# Application.
 
 all: app
 
-# Application.
+clean-all: clean clean-docs
+	rm -f .$(PROJECT).plt
+	rm -rf deps logs
 
 deps/ranch:
-	@$(REBAR) get-deps
+	@mkdir -p deps/
+	git clone -n -- https://github.com/extend/ranch.git deps/ranch
+	cd deps/ranch ; git checkout -q $(RANCH_VSN)
+
+MODULES = $(shell ls src/*.erl | sed 's/src\///;s/\.erl/,/' | sed '$$s/.$$//')
 
 app: deps/ranch
-	@$(REBAR) compile
+	@cd deps/ranch ; make
+	@mkdir -p ebin/
+	@cat src/cowboy.app.src \
+		| sed 's/{modules, \[\]}/{modules, \[$(MODULES)\]}/' \
+		> ebin/cowboy.app
+	erlc -v $(ERLC_OPTS) -o ebin/ -pa ebin/ src/cowboy_middleware.erl src/*.erl
 
 clean:
-	@$(REBAR) clean
+	-@cd deps/ranch && make clean
+	rm -rf ebin/
 	rm -f test/*.beam
 	rm -f erl_crash.dump
 
+# Documentation.
+
 docs: clean-docs
 	erl -noshell -eval 'edoc:application(cowboy, ".", []), init:stop().'
 
@@ -30,24 +48,16 @@ clean-docs:
 
 # Tests.
 
-deps/proper:
-	@$(REBAR) -C rebar.tests.config get-deps
-	cd deps/proper && $(REBAR) compile
-
-tests: clean deps/proper app eunit ct
-
-eunit:
-	@$(REBAR) -C rebar.tests.config eunit skip_deps=true
-
 CT_RUN = ct_run \
 	-pa ebin deps/*/ebin \
 	-dir test \
 	-logdir logs \
 	-cover test/cover.spec
 
-ct:
+tests: ERLC_OPTS += -DTEST=1
+tests: clean app
 	@mkdir -p logs/
-	@$(CT_RUN) -suite http_SUITE ws_SUITE
+	@$(CT_RUN) -suite eunit_SUITE http_SUITE ws_SUITE
 
 autobahn:
 	@mkdir -p logs/
@@ -55,12 +65,10 @@ autobahn:
 
 # Dialyzer.
 
-DIALYZER = dialyzer
-
-build-plt:
-	@$(DIALYZER) --build_plt --output_plt .$(PROJECT).plt \
-		--apps kernel stdlib sasl inets crypto public_key ssl deps/*
+build-plt: app
+	@dialyzer --build_plt --output_plt .$(PROJECT).plt \
+		--apps kernel stdlib sasl inets crypto public_key ssl deps/ranch
 
 dialyze:
-	@$(DIALYZER) --src src --plt .$(PROJECT).plt --no_native \
+	@dialyzer --src src --plt .$(PROJECT).plt --no_native \
 		-Werror_handling -Wrace_conditions -Wunmatched_returns # -Wunderspecs