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image_ocr

0.1.0
0.2.0 0.1.0

Idiomatic Elixir interface to the Tesseract OCR engine via a NIF, accepting Vix.Vips.Image structs, file paths, or in-memory image binaries.

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image_ocr Makefile
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Makefile 

PRIV_DIR    = $(MIX_APP_PATH)/priv

NIF_LIB     = $(PRIV_DIR)/image_ocr_nif.so



ERTS_INCLUDE_DIR ?= $(shell erl -noshell -eval 'io:format("~ts/erts-~ts/include/", [code:root_dir(), erlang:system_info(version)]).' -s init stop)



PKG_CFLAGS  = $(shell pkg-config --cflags tesseract lept)

PKG_LDLIBS  = $(shell pkg-config --libs tesseract lept)



CXX        ?= c++

CXXFLAGS   ?= -O3 -fPIC -std=c++17 -Wall -Wextra

CPPFLAGS   += -I"$(ERTS_INCLUDE_DIR)" $(PKG_CFLAGS)

LDFLAGS    +=

LDLIBS     += $(PKG_LDLIBS)



UNAME_S := $(shell uname -s)

ifeq ($(UNAME_S),Darwin)

  LDFLAGS += -dynamiclib -undefined dynamic_lookup -flat_namespace

else

  LDFLAGS += -shared

endif



SRC = c_src/image_ocr_nif.cc



all: check_version $(NIF_LIB)



check_version:

	@pkg-config --atleast-version=5.0.0 tesseract || \

	  (echo "ERROR: image_ocr requires tesseract >= 5.0.0 (found $$(pkg-config --modversion tesseract 2>/dev/null || echo none))"; exit 1)



$(NIF_LIB): $(SRC)

	@mkdir -p $(PRIV_DIR)

	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS) $(SRC) -o $@ $(LDLIBS)



clean:

	rm -f $(NIF_LIB)



.PHONY: all clean check_version