Add project files
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# =============================================================================
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# BuildDir.cmake
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#
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# Script-mode bridge, the same idea as PrintConfig.cmake: tells
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# breeze/scripts/*.sh and breeze/scripts/*.bat which build directory to work on, so that
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# logic exists once here instead of twice in two shell dialects.
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#
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# Every preset builds in its own directory, out/build/<name> (see
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# BUILD_OUTPUT_DIR in project/Configuration.cmake), which is what lets you switch
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# presets without one's cache clobbering another's. The scripts have to
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# pick one of them:
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#
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# build.* knows the name already (--preset <name>, else
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# "default") and only needs the path. After a
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# successful configure it also records the choice as
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# the one built last.
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# run.* install.* take an optional --preset <name>; without it they use
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# docs.* the directory that was built last, or the only one
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# that exists, or say what to do if that's ambiguous.
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#
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# Usage:
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# cmake [-DPMN_NAME=<name>] [-DPMN_RECORD=ON] -P breeze/cmake/BuildDir.cmake
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#
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# PMN_NAME a preset name, or "default". Given: the answer is
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# BUILD_OUTPUT_DIR/<name>, whether or not it exists yet (build
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# is about to create it). Not given: discover one -- the one
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# built last, else the only one, else an error.
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# PMN_RECORD also remember PMN_NAME as the one built last (a one-line
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# file, out/build/.last).
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#
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# Prints exactly one line, via message(STATUS ...) for the reason
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# PrintConfig.cmake documents (STATUS is the one message() mode CMake sends
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# to stdout, at the cost of a "-- " prefix every caller strips):
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#
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# -- BUILD_DIR=<path> relative to the project root with forward slashes
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# when it's inside the project (the normal case),
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# absolute otherwise
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# -- ERROR=<text> what to tell the user
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#
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# The exit status is 0 either way -- callers key on which line they got. The
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# error text sticks to plain words and avoids the characters cmd.exe treats
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# specially (& | < > ^ % ! and parentheses), so a .bat can echo it back
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# verbatim.
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# =============================================================================
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get_filename_component(CMAKE_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/../.." ABSOLUTE)
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include("${CMAKE_SOURCE_DIR}/project/Configuration.cmake")
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# <path> shown relative to the project root when it's inside it.
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function(_pmn_display_path ABSOLUTE_PATH OUT_VAR)
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file(RELATIVE_PATH _pmn_rel "${CMAKE_SOURCE_DIR}" "${ABSOLUTE_PATH}")
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if(_pmn_rel MATCHES "^\\.\\.")
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set(${OUT_VAR} "${ABSOLUTE_PATH}" PARENT_SCOPE)
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else()
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set(${OUT_VAR} "${_pmn_rel}" PARENT_SCOPE)
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endif()
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endfunction()
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set(_pmn_root "${BUILD_OUTPUT_DIR}")
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_pmn_display_path("${_pmn_root}" _pmn_root_shown)
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set(_pmn_key "")
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set(_pmn_value "")
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if(NOT "${PMN_NAME}" STREQUAL "")
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# ---- A name was given: the answer is just the path. ----------------------
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if(PMN_NAME MATCHES "[/\\\\]" OR PMN_NAME STREQUAL "." OR PMN_NAME STREQUAL "..")
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set(_pmn_key "ERROR")
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set(_pmn_value "'${PMN_NAME}' is not a valid preset name: it must be a single directory name, not a path.")
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else()
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_pmn_display_path("${_pmn_root}/${PMN_NAME}" _pmn_shown)
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set(_pmn_key "BUILD_DIR")
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set(_pmn_value "${_pmn_shown}")
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if(PMN_RECORD)
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file(MAKE_DIRECTORY "${_pmn_root}")
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file(WRITE "${_pmn_root}/.last" "${PMN_NAME}\n")
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endif()
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endif()
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else()
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# ---- No name: discover one. ---------------------------------------------
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# Candidates are the subdirectories that hold a CMake cache.
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set(_pmn_candidates "")
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file(GLOB _pmn_children LIST_DIRECTORIES true "${_pmn_root}/*")
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foreach(_pmn_child IN LISTS _pmn_children)
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if(IS_DIRECTORY "${_pmn_child}" AND EXISTS "${_pmn_child}/CMakeCache.txt")
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get_filename_component(_pmn_child_name "${_pmn_child}" NAME)
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list(APPEND _pmn_candidates "${_pmn_child_name}")
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endif()
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endforeach()
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list(SORT _pmn_candidates)
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list(LENGTH _pmn_candidates _pmn_count)
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# The one built last, if that pointer still names a real build.
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set(_pmn_last "")
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if(EXISTS "${_pmn_root}/.last")
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file(STRINGS "${_pmn_root}/.last" _pmn_last_lines LIMIT_COUNT 1)
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string(STRIP "${_pmn_last_lines}" _pmn_last)
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endif()
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set(_pmn_chosen "")
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if(NOT "${_pmn_last}" STREQUAL "" AND "${_pmn_last}" IN_LIST _pmn_candidates)
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set(_pmn_chosen "${_pmn_last}")
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elseif(_pmn_count EQUAL 1)
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set(_pmn_chosen "${_pmn_candidates}")
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endif()
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if(NOT "${_pmn_chosen}" STREQUAL "")
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_pmn_display_path("${_pmn_root}/${_pmn_chosen}" _pmn_shown)
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set(_pmn_key "BUILD_DIR")
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set(_pmn_value "${_pmn_shown}")
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elseif(_pmn_count EQUAL 0)
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set(_pmn_key "ERROR")
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if(EXISTS "${_pmn_root}/CMakeCache.txt")
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set(_pmn_value "${_pmn_root_shown} holds a build from the old single-directory layout, which this version no longer uses. Delete it, then run breeze/scripts/build to create one build directory per preset.")
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else()
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set(_pmn_value "No build found under ${_pmn_root_shown}. Run breeze/scripts/build first, optionally with --preset NAME.")
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endif()
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else()
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list(JOIN _pmn_candidates ", " _pmn_names)
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set(_pmn_key "ERROR")
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set(_pmn_value "Several builds exist under ${_pmn_root_shown} and none was built last through the scripts: ${_pmn_names}. Pass --preset NAME to choose one.")
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endif()
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endif()
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message(STATUS "${_pmn_key}=${_pmn_value}")
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