# This directory contains Lean builtin libraries and Lua scripts
# needed to run Lean. The builtin Lean libraries are compiled
# using ${LEAN_BINARY_DIR}/shell/lean
# The library builtin is not a real library.
# It is just a hack to force CMake to consider our custom targets
add_library(builtin builtin.cpp)

# We copy files to the shell directory, to make sure we can test lean
# without installing it.
set(SHELL_DIR ${LEAN_BINARY_DIR}/shell)

file(GLOB LEANLIB "*.lua")
FOREACH(FILE ${LEANLIB})
  get_filename_component(FNAME ${FILE} NAME)
  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${FNAME}
    COMMAND ${CMAKE_COMMAND} -E copy ${FILE} ${CMAKE_CURRENT_BINARY_DIR}/${FNAME}
    COMMAND ${CMAKE_COMMAND} -E copy ${FILE} ${SHELL_DIR}/${FNAME}
    DEPENDS ${FILE})
  add_custom_target("${FNAME}_builtin" DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${FNAME})
  add_dependencies(builtin "${FNAME}_builtin")
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${FNAME} DESTINATION library)
ENDFOREACH(FILE)

# The following command invokes the lean binary.
# So, it CANNOT be executed if we are cross-compiling.
function(add_theory_core FILE ARG EXTRA_DEPS)
  get_filename_component(BASENAME ${FILE} NAME_WE)
  set(FNAME "${BASENAME}.olean")
  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${FNAME}
    COMMAND ${SHELL_DIR}/lean ${ARG} -o ${CMAKE_CURRENT_BINARY_DIR}/${FNAME} ${CMAKE_CURRENT_SOURCE_DIR}/${FILE}
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/${FNAME} ${SHELL_DIR}/${FNAME}
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/${FNAME} ${CMAKE_CURRENT_SOURCE_DIR}/obj/${FNAME}
    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/${FILE} ${SHELL_DIR}/lean ${EXTRA_DEPS})
  add_custom_target("${BASENAME}_builtin" DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${FNAME} ${EXTRA_DEPS})
  add_dependencies(builtin ${BASENAME}_builtin)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${FNAME} DESTINATION library)
endfunction()

# When cross compiling, we cannot execute lean during the build.
# So, we just copy the precompiled .olean files.
function(copy_olean FILE)
  get_filename_component(BASENAME ${FILE} NAME_WE)
  set(FNAME "${BASENAME}.olean")
  add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${FNAME}
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/obj/${FNAME} ${CMAKE_CURRENT_BINARY_DIR}/${FNAME}
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/obj/${FNAME} ${SHELL_DIR}/${FNAME}
    DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/obj/${FNAME})
  add_custom_target("${BASENAME}_builtin" DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${FNAME})
  add_dependencies(builtin ${BASENAME}_builtin)
  install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${FNAME} DESTINATION library)
endfunction()

function(add_kernel_theory FILE DEPS)
  if(CMAKE_CROSSCOMPILING)
    copy_olean(${FILE})
  else()
    add_theory_core(${FILE} "-n" "${DEPS}")
  endif()
endfunction()

function(add_theory FILE DEPS)
  if(CMAKE_CROSSCOMPILING)
    copy_olean(${FILE})
  else()
    add_theory_core(${FILE} "" "${DEPS}")
  endif()
endfunction()

add_kernel_theory("kernel.lean"    "${CMAKE_CURRENT_BINARY_DIR}/macros.lua")
add_kernel_theory("nat.lean"       "${CMAKE_CURRENT_BINARY_DIR}/kernel.olean")

add_theory("int.lean"       "${CMAKE_CURRENT_BINARY_DIR}/nat.olean")
add_theory("real.lean"      "${CMAKE_CURRENT_BINARY_DIR}/int.olean")
add_theory("specialfn.lean" "${CMAKE_CURRENT_BINARY_DIR}/real.olean")
add_theory("cast.lean"      "${CMAKE_CURRENT_BINARY_DIR}/nat.olean")