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# Installation policy belongs in doc/build.md. All lookups use local, then system.
function(cpsc_find_dependency kind output)
cmake_parse_arguments(dependency "REQUIRED" "" "NAMES;PATH_SUFFIXES" ${ARGN})
if(kind STREQUAL "PROGRAM")
set(directories ${CPSC_LOCAL_BIN_DIRS})
set(cache_type FILEPATH)
elseif(kind STREQUAL "LIBRARY")
set(directories ${CPSC_LOCAL_LIBRARY_DIRS})
set(cache_type FILEPATH)
elseif(kind STREQUAL "PATH")
set(directories ${CPSC_LOCAL_PREFIXES} ${CPSC_LOCAL_INCLUDE_DIRS})
set(cache_type PATH)
else()
message(FATAL_ERROR "Unknown dependency kind: ${kind}")
endif()
# Preserve a system path supplied by the caller, after checking local paths.
set(system_hint)
if(DEFINED ${output} AND EXISTS "${${output}}")
if(IS_DIRECTORY "${${output}}")
set(system_hint "${${output}}")
else()
get_filename_component(system_hint "${${output}}" DIRECTORY)
endif()
endif()
set(selected "${output}-NOTFOUND")
set(is_local FALSE)
foreach(location LOCAL SYSTEM)
unset(candidate CACHE)
unset(candidate)
if(location STREQUAL "LOCAL")
if(NOT directories)
continue()
endif()
set(search PATHS ${directories} NO_DEFAULT_PATH)
else()
set(search HINTS ${system_hint})
endif()
if(kind STREQUAL "PROGRAM")
find_program(candidate NAMES ${dependency_NAMES}
PATH_SUFFIXES ${dependency_PATH_SUFFIXES} ${search})
elseif(kind STREQUAL "LIBRARY")
find_library(candidate NAMES ${dependency_NAMES}
PATH_SUFFIXES ${dependency_PATH_SUFFIXES} ${search})
else()
find_path(candidate NAMES ${dependency_NAMES}
PATH_SUFFIXES ${dependency_PATH_SUFFIXES} ${search})
endif()
if(candidate)
set(selected "${candidate}")
if(location STREQUAL "LOCAL")
set(is_local TRUE)
endif()
break()
endif()
endforeach()
unset(candidate CACHE)
if(NOT selected AND dependency_REQUIRED)
message(FATAL_ERROR "Required dependency ${output} (${dependency_NAMES}) was not found locally or in the system")
endif()
set(${output} "${selected}" CACHE ${cache_type} "Resolved dependency" FORCE)
set(${output} "${selected}" PARENT_SCOPE)
set(${output}_LOCAL "${is_local}" PARENT_SCOPE)
endfunction()
macro(cpsc_find_library output)
cpsc_find_dependency(LIBRARY ${output} NAMES ${ARGN})
endmacro()
macro(cpsc_find_include output name)
cpsc_find_dependency(PATH ${output} NAMES "${name}")
endmacro()
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