# hotswap_copy_glob.cmake — stage glob-matched artifacts into a directory.
#
# Invoked via `cmake -P` from the HotSwap ExternalProject install steps in
# cmake/Hotswap.cmake. It copies the files a HotSwap build stage produces
# (the comgr/ROCR shared libraries and the LLVM tools) into the flat
# `${stage}/lib`, `${stage}/llvm-tools` layout mirage discovers.
#
# Inputs (all passed with -D):
#   HOTSWAP_ROOT            Directory to resolve patterns against (a build tree).
#   HOTSWAP_GLOB            ;-separated list of filename glob patterns, e.g.
#                          "libamd_comgr.so*" or "lld;ld.lld;llc;llvm-mc".
#   HOTSWAP_DST            Destination directory (created if absent).
#   HOTSWAP_RECURSE_ANCHOR Optional. When set, the file with this name is located
#                          recursively under HOTSWAP_ROOT and its parent directory
#                          is used as the glob base instead of HOTSWAP_ROOT (ROCR
#                          buries libhsa-runtime64.so in a build subdirectory whose
#                          path is not known ahead of time).
#
# FOLLOW_SYMLINK_CHAIN is used so versioned SONAME links (e.g.
# libhsa-runtime64.so -> libhsa-runtime64.so) are reproduced verbatim.

if(NOT DEFINED HOTSWAP_ROOT OR NOT DEFINED HOTSWAP_GLOB OR NOT DEFINED HOTSWAP_DST)
  message(FATAL_ERROR "hotswap_copy_glob: HOTSWAP_ROOT, HOTSWAP_GLOB and HOTSWAP_DST are required")
endif()

set(_base "${HOTSWAP_ROOT}")
if(DEFINED HOTSWAP_RECURSE_ANCHOR AND NOT HOTSWAP_RECURSE_ANCHOR STREQUAL "")
  file(GLOB_RECURSE _anchor "${HOTSWAP_ROOT}/${HOTSWAP_RECURSE_ANCHOR}")
  if(NOT _anchor)
    message(FATAL_ERROR "hotswap_copy_glob: ${HOTSWAP_RECURSE_ANCHOR} not found under ${HOTSWAP_ROOT}")
  endif()
  list(GET _anchor 0 _anchor0)
  get_filename_component(_base "${_anchor0}" DIRECTORY)
endif()

set(_patterns)
foreach(_g IN LISTS HOTSWAP_GLOB)
  list(APPEND _patterns "${_base}/${_g}")
endforeach()

file(GLOB _files LIST_DIRECTORIES false ${_patterns})
if(NOT _files)
  message(FATAL_ERROR "hotswap_copy_glob: no files matched ${_patterns}")
endif()

file(MAKE_DIRECTORY "${HOTSWAP_DST}")
foreach(_f IN LISTS _files)
  file(INSTALL "${_f}" DESTINATION "${HOTSWAP_DST}"
       USE_SOURCE_PERMISSIONS FOLLOW_SYMLINK_CHAIN)
endforeach()
message(STATUS "hotswap: staged ${_files} -> ${HOTSWAP_DST}")