IMG_SRC_PATH ?= image_path
IMG_SRC ?= $(shell find $(IMG_SRC_PATH) -maxdepth 1 -name "*.jpg" | \
		sed -e s,.*/,,)

THUMB_RES		?= 200x200
THUMB_DIR		?= thumbnails_$(THUMB_RES)
IMAGE_DIR		?= images
HTML_TEMPLATES_DIR	?= ~/projects/thumbnailer

CONVERT		?= convert
EXIF		?= exif
JHEAD		?= jhead

thumbnails := $(patsubst %,$(THUMB_DIR)/%,$(IMG_SRC))

thumbnails := $(sort $(thumbnails))
images := $(patsubst %,$(IMAGE_DIR)/%,$(IMG_SRC))

ifeq ($(V),1)
	Q		=
	QUIET_CONVERT	=
	QUIET_CP	=
	QUIET_ROTATE	=
	QUIET_HTML	=
else
	Q		= @
	QUIET_CP	= @echo "     COPY " $@;
	QUIET_CONVERT	= @echo "  CONVERT " $@;
	QUIET_ROTATE	=  echo "   ROTATE " $@;
	QUIET_HTML	= @echo "     HTML " $@;
endif

all: index.html

%/:
	mkdir $@

$(IMAGE_DIR)/%.jpg: $(IMG_SRC_PATH)/%.jpg $(IMAGE_DIR)/
	$(QUIET_CP)cp $< $@
	$(Q)$(EXIF) $@ | grep Orientation | grep -q Top-left || \
		$(QUIET_ROTATE)$(JHEAD) -autorot $@
	$(Q)touch $@
	$(Q)chmod 644 $@

$(THUMB_DIR)/%.jpg: $(IMAGE_DIR)/%.jpg $(THUMB_DIR)/
	$(QUIET_CONVERT)$(CONVERT) $< -thumbnail $(THUMB_RES) $@

index.html: $(thumbnails) $(images)
	$(QUIET_HTML)cat $(HTML_TEMPLATES_DIR)/index.html.header > $@ ;	\
	for t in $(thumbnails) ; do					\
		img=`echo $$t | sed -e s,.*/,,` ;			\
		cat $(HTML_TEMPLATES_DIR)/index.html.img |		\
			sed -e s=\$$thumb=$$t=				\
			    -e s=\$$img=$(IMAGE_DIR)/$$img= >> $@ ;	\
	done ;								\
	cat $(HTML_TEMPLATES_DIR)/index.html.footer >> $@ ;

.PHONY: all