function(add_tikz_target TIKZ_FILE TEMPLATE)
    get_filename_component(basename ${TIKZ_FILE} NAME_WE)
    set(pdf_file "${basename}.pdf")
    set(svg_file "${basename}.svg")

    add_custom_command(OUTPUT ${pdf_file}
        COMMAND echo "'\\def\\\\tikzfile{${CMAKE_CURRENT_SOURCE_DIR}/${TIKZ_FILE}}'" > tmp.tex
        COMMAND echo "'\\input{${CMAKE_CURRENT_SOURCE_DIR}/template-tex.tex}}'" >> tmp.tex
        COMMAND pdflatex -jobname ${basename} -file-line-error -interaction nonstopmode tmp.tex >/dev/null
        COMMAND cmake -E remove tmp.tex
        MAIN_DEPENDENCY ${TIKZ_FILE}
        COMMENT "Generating ${pdf_file}"
        )

    add_custom_command(OUTPUT ${svg_file}
        COMMAND pdf2svg ${pdf_file} ${svg_file}
        COMMAND cmake -E copy_if_different ${svg_file} ${CMAKE_CURRENT_SOURCE_DIR}/${svg_file}
        MAIN_DEPENDENCY ${pdf_file}
        COMMENT "Generating ${svg_file}"
        )
endfunction()

add_tikz_target(flow.tikz template-qtikz.tex)
add_custom_target(doc DEPENDS flow.svg)