Levelling up my make skills.

Makefile

REVISION := 1.wut
ARCH := x86_64

PRJ := $(shell basename $(shell pwd))
CABAL := $(PRJ).cabal

VER := $(shell awk '/^version:/{ print $$2 }' $(CABAL))

MAINTAINER := $(shell awk '/^maintainer:/{ print $$2 }' $(CABAL))

DESC := $(shell awk '/^description:/{ print substr($$0, index($$0,$$2)) }' $(CABAL))
SYNOP := $(shell awk '/^synopsis:/{ print substr($$0, index($$0,$$2)) }' $(CABAL))

EXTERNAL_PKGS = external-pkgs.txt
DEPENDS := $(shell awk '{ printf "--depends " $$1 " " }' $(EXTERNAL_PKGS))

BUILD_ROOT := BUILDROOT
RELATIVE_APP_DIR := apps/$(PRJ)
WORK_DIR := build-$(PRJ)_XXXX

EPOCH := $(shell date "+%s")

BLD := stack

TMP_DIR := $(shell mktemp -d "/tmp/$(WORK_DIR)")

BDIR = $(TMP_DIR)/$(BUILD_ROOT)/$(RELATIVE_APP_DIR)
RPM_NAME = $(PRJ)-$(VER)-$(REVISION).$(ARCH).rpm

INIT_F = $(wildcard init/*)
BIN_SCRIPT_F = $(wildcard bin/*.sh)
TEMPLATE_F = $(wildcard templates/*)

.PHONY: all clean
.DEFAULT: build

all:
	@echo $(PRJ)
	@echo $(VER)
	@echo $(DEPENDS)
	@echo $(RPM_NAME)
mk_tmp:
	@echo Making working folder $(TMP_DIR)
	@mkdir -p $(BDIR)

ifneq ($(strip $(INIT_F)),)
init_scripts:
	@echo "Init scripts detected"
	@mkdir $(BDIR)/init
	@cp init/* $(BDIR)/init/
else
init_scripts:
	@echo "No init files - Not necessarily an error"
endif

ifneq ($(strip $(TEMPLATE_F)),)
template_files:
	@echo "Template files detected"
	@mkdir $(BDIR)/templates
	@cp templates/* $(BDIR)/templates/
else
template_files:
	@echo "No template files - Unlikely to be an error"
endif

ifneq ($(strip ($BIN_SCRIPT_F)),)
bin_scripts:
	@echo "Script files detected"
	@mkdir $(BDIR)/bin
	@cp bin/* $(BDIR)/bin/
else
bin_scripts:
	@echo "No bin 'sh' files found - This is probably an error."
endif

build:
	@echo "Running build..."
	$(BLD) build

test:
	@echo "Running tests..."
	$(BLD) test

clean:
	$(BLD) clean

rpm: all mk_tmp init_scripts template_files bin_scripts
	$(BLD) install --local-bin-path $(BDIR)/bin/
	@echo "Building RPM and including the following files..."
	@echo "bin/$(PRJ)"
	@echo $(BIN_SCRIPT_F) $(INIT_F) $(TEMPLATE_F)
	@echo "With the following external dependencies...( $(DEPENDS) )"
	@echo "Starting RPM build with 'fpm'"
	@fpm -n '$(PRJ)' -t rpm -s dir -a native -C $(BDIR) \
    -m '$(MAINTAINER)' --vendor 'Team' --version $(VER) \
    --rpm-changelog Changelog.fpm --license Non-distributable --description '$(DESC) - $(SYNOP)' --iteration $(REVISION) \
    --epoch $(EPOCH) $(DEPENDS) bin/$(PRJ) $(BIN_SCRIPT_F) $(INIT_F) $(TEMPLATE_F)

scp_rpm: rpm
	@scp $(RPM_NAME) dat.build.server:/wut/

clean_tmp:
	@echo "Removing All Project Build Attempts ... /tmp/build-$(PRJ)_*"
	@rm -Rf /tmp/build-$(PRJ)_*