#
# This file is part of the GROMACS molecular simulation package.
#
# Copyright (c) 2014, by the GROMACS development team, led by
# Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
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set(INSTALL_GUIDE_BUILD_IS_POSSIBLE OFF)
if(NOT ${CMAKE_BINARY_DIR} STREQUAL ${CMAKE_SOURCE_DIR})
    # We can only build the install guide outside of the source dir
    find_package(Pandoc)
    if(PANDOC_EXECUTABLE)
        set(INSTALL_GUIDE_BUILD_IS_POSSIBLE ON)
    endif()
endif()

if(INSTALL_GUIDE_BUILD_IS_POSSIBLE)
    # Do replacement of CMake variables for version strings, etc.
    configure_file(configure-install-guide.cmake.in
        ${CMAKE_CURRENT_BINARY_DIR}/configure-install-guide.cmake
        @ONLY)

    # This defers until build time the configuration of
    # install-guide.md, which could be faster
    add_custom_command(
        OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/install-guide.md
        COMMAND ${CMAKE_COMMAND}
            -P ${CMAKE_CURRENT_BINARY_DIR}/configure-install-guide.cmake
        DEPENDS
            ${CMAKE_CURRENT_BINARY_DIR}/configure-install-guide.cmake
            ${CMAKE_CURRENT_SOURCE_DIR}/install-guide.md
        COMMENT "Configuring install guide"
        VERBATIM
        )

    # Make the HTML install guide
    add_custom_command(
        OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/install-guide.html
        COMMAND pandoc -t html -o ${CMAKE_CURRENT_BINARY_DIR}/install-guide.html install-guide.md -s --toc
        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/install-guide.md
        VERBATIM
        )

    # Make the INSTALL file for CPack for the tarball
    add_custom_command(
        OUTPUT ${CMAKE_BINARY_DIR}/INSTALL
        COMMAND pandoc -t plain -o ../INSTALL install-guide.md
        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/install-guide.md
        VERBATIM
        )

    # Add a top-level target for the others to hook onto
    add_custom_target(install-guide
        DEPENDS
           ${CMAKE_CURRENT_BINARY_DIR}/install-guide.html
           ${CMAKE_BINARY_DIR}/INSTALL
        VERBATIM
        )
endif()
