CMakeWorkflowTargetBridge.cmake

include_guard(GLOBAL)

# Opt-in adapter. The native target is prepared by CMake before the CLI runs.
set(WORKFLOW_RUNNER_EXECUTABLE "" CACHE FILEPATH "Optional published CMakeWorkflow CLI binary")

function(cmake_workflow_add_target_bridge bridge_name)
    cmake_parse_arguments(PARSE_ARGV 1 ARG "" "TARGET" "ARGS")
    if (ARG_UNPARSED_ARGUMENTS OR ARG_KEYWORDS_MISSING_VALUES OR NOT ARG_TARGET OR NOT TARGET "${ARG_TARGET}")
        message(FATAL_ERROR "cmake_workflow_add_target_bridge(${bridge_name}): TARGET must exist")
    endif ()
    if (NOT WORKFLOW_RUNNER_EXECUTABLE OR NOT EXISTS "${WORKFLOW_RUNNER_EXECUTABLE}")
        message(FATAL_ERROR "Set WORKFLOW_RUNNER_EXECUTABLE to the published CMakeWorkflow binary")
    endif ()
    if (CMAKE_CROSSCOMPILING)
        message(FATAL_ERROR "This bridge requires a native executable; cross-compiled execution is not supported")
    endif ()
    get_target_property(_type "${ARG_TARGET}" TYPE)
    if (NOT _type STREQUAL "EXECUTABLE")
        message(FATAL_ERROR "Only CMake executable targets are supported by this bridge")
    endif ()

    # The first configure works on CMake 3.26: unlike a File API query created
    # mid-configure, file(GENERATE) writes this manifest in the current generate.
    # Generator expressions preserve OUTPUT_NAME, per-config output directories,
    # executable suffixes and IDE multi-config generators.
    set(_manifest "${CMAKE_BINARY_DIR}/cmake-workflow/targets/$<CONFIG>/${ARG_TARGET}.json")
    set(_json "{\n  \"schemaVersion\": 1,\n  \"target\": \"${ARG_TARGET}\",\n  \"configuration\": \"$<CONFIG>\",\n  \"executable\": \"$<TARGET_FILE:${ARG_TARGET}>\"\n}\n")
    file(GENERATE OUTPUT "${_manifest}" CONTENT "${_json}")

    add_custom_target("${bridge_name}"
            COMMAND "${WORKFLOW_RUNNER_EXECUTABLE}" target run
            --build-dir "${CMAKE_BINARY_DIR}"
            --target "${ARG_TARGET}"
            --config "$<CONFIG>"
            --prepared -- ${ARG_ARGS}
            DEPENDS "${ARG_TARGET}"
            USES_TERMINAL
            VERBATIM
    )
    set_property(TARGET "${bridge_name}" PROPERTY FOLDER "cmake-workflow")
endfunction()