# -*- makefile -*-

PYTHON_VERSION  ?= 2.4.6
PYTHON_URL      ?= http://www.python.org/ftp/python/$(PYTHON_VERSION)/Python-$(PYTHON_VERSION).tgz
SETUPTOOLS_URL  ?= http://peak.telecommunity.com/dist/ez_setup.py
PYTHON_DIR      ?= python

###########################################################################

PYTHON       = $(BASEDIR)/$(PYTHON_DIR)/bin/python
EASY_INSTALL = $(BASEDIR)/$(PYTHON_DIR)/bin/easy_install
PIP          = $(BASEDIR)/$(PYTHON_DIR)/bin/pip
PASTER       = $(BASEDIR)/$(PYTHON_DIR)/bin/paster

# Usage:
#     @$(dlegg) <package>
#
# Downloads egg to '$(DLCACHE)/<package>-*.egg' unless a file with that name
# already exists.
#
# THIS DOES NOT WORK WITH ALL PACKAGES !!! USE WITH CARE
define dlegg
    _dlegg() {								\
	if [ -r $(DLCACHE)/$$1-*.egg ]; then				\
	    name="`cd $(DLCACHE); echo $$1-*.egg`";			\
	    echo "Fetching '$$name' from cache.";			\
	else								\
	    [ -z "$(NONET)" ] || ( echo "Missing '$$1'."; exit 2 );	\
	    $(EASY_INSTALL) -zmaxd $(DLCACHE) $$1;			\
	    name="`cd $(DLCACHE); echo $$1-*.egg`";			\
	    if [ -d $(DLCACHE)/$$name ]; then				\
		cd $(DLCACHE)/$$name;					\
		zip -r ../$$name.zip .;					\
		cd ..;							\
		rm -r $$name;						\
		mv $$name.zip $$name;					\
	    fi;								\
	fi;								\
    };									\
    _dlegg
endef

# Usage:
#     @$(install) <package>
#
# Downloads egg to '$(DLCACHE)/<package>-*.egg' and installs it unless a file
# with that name already exists.
define install
    _install() {									\
	echo "$(PIP) install --download-cache="$(DLCACHE)/pip" $(PIP_OPTS) $$1";	\
	$(PIP) install --download-cache="$(DLCACHE)/pip" $(PIP_OPTS) "$$1";		\
	cd $(DLCACHE)/pip;								\
	for file in *.tar.gz; do							\
	    name="$${file##*%2F}";							\
	    if [ "$$name" != "$$file" -a ! -r "$$name" ]; then				\
		ln -s $$file $$name || exit 1;						\
	    fi;										\
	done										\
    };											\
    _install
endef

###########################################################################

python-unpack: $(PYTHON_DIR)/Python-$(PYTHON_VERSION)/README
$(PYTHON_DIR)/Python-$(PYTHON_VERSION)/README:
	mkdir -p $(PYTHON_DIR)
	@$(httpget) $(PYTHON_URL) $(PYTHON_DIR)/python.tgz
	tar -C $(PYTHON_DIR) -xzf $(PYTHON_DIR)/python.tgz
	rm -f $(PYTHON_DIR)/python.tgz
.PHONY: python-unpack

python-build: $(PYTHON)
$(PYTHON):
	cd $(PYTHON_DIR)/Python-$(PYTHON_VERSION) && ./configure --prefix=$(BASEDIR)/$(PYTHON_DIR)
	cd $(PYTHON_DIR)/Python-$(PYTHON_VERSION) && make
	cd $(PYTHON_DIR)/Python-$(PYTHON_VERSION) && make install
.PHONY: python-build

python-rebuild: python-clean python-build
.PHONY: python-rebuild

python-clean:
	cd $(PYTHON_DIR)/Python-$(PYTHON_VERSION) && make clean
	rm -f $(PYTHON)
.PHONY: python-clean

python: python-unpack python-build
.PHONY: python

setuptools: $(BASEDIR)/$(PYTHON_DIR)/bin/easy_install
$(BASEDIR)/$(PYTHON_DIR)/bin/easy_install:
	mkdir -p $(PYTHON_DIR)/Extensions
	@$(httpget) $(SETUPTOOLS_URL) $(PYTHON_DIR)/Extensions/ez_setup.py
	@(														\
	    if [ -r $(DLCACHE)/setuptools-*.egg ]; then									\
		name="`cd $(DLCACHE); echo setuptools-*.egg`";								\
		echo "Fetching '$$name' from cache.";									\
		cp "$(DLCACHE)/$$name" $(PYTHON_DIR)/Extensions;							\
	    else													\
	        echo "Downloading setuptools.";										\
		( cd $(PYTHON_DIR)/Extensions && $(PYTHON) -c 'import ez_setup; ez_setup.download_setuptools()' );	\
		cp $(PYTHON_DIR)/Extensions/setuptools-*.egg $(DLCACHE);						\
	    fi;														\
	)
	cd $(PYTHON_DIR)/Extensions && $(PYTHON) ez_setup.py
.PHONY: setuptools

pip: $(PIP)
$(PIP):
	@$(dlegg) pip
	$(EASY_INSTALL) $(DLCACHE)/pip-*.egg
.PHONY: pip

pybase: python setuptools pip
.PHONY: pybase

###########################################################################

debdepends::
	aptitude install build-essential zlibc

eggs::
	@$(install) zc.buildout

.gitignore::
	@$(gitignore) "*.pyc"
	@$(gitignore) "/python/"

.env::
	@$(env) PATH $(BASEDIR)/$(PYTHON_DIR)/bin

clean::
	rm -rf "$(PYTHON_DIR)"

setup:: pybase

PIP_CACHE_FILES := $(shell cd $(DLCACHE)/pip; ls *.tar.gz | grep -vF '%2F')

init-nonet: PIP_OPTS  = --no-index $(patsubst %,--find-link=file://$(BASEDIR)/$(DLCACHE)/pip/%,$(PIP_CACHE_FILES))

fullhelp::
	@echo "    python-rebuild"
	@echo "        recompile python from source. This may be needed after"
	@echo "        upgrading the host distribution."
	@echo

varhelp::
	@echo "    PYTHON_VERSION ($(PYTHON_VERSION))"
	@echo "        Python version to download and compile."
	@echo
	@echo "    PYTHON_URL ($(PYTHON_URL))"
	@echo "        URL to download python from. The default value is automatically"
	@echo "        generated from PYTHON_VERSION."
	@echo
	@echo "    SETUPTOOLS_URL ($(SETUPTOOLS_URL))"
	@echo "        URL to download 'ez_setup.py' from."
	@echo
	@echo "    PYTHON_DIR ($(PYTHON_DIR))"
	@echo "        Name of subdirectory for the local python installation."
	@echo