42 lines
1.9 KiB
CMake
42 lines
1.9 KiB
CMake
# Copyright (C) 2020 Google, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# parse_version() reads and parses the version string from FILE, assigning the
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# version string to ${PROJECT}_VERSION and the parsed version to
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# ${PROJECT}_VERSION_MAJOR, ${PROJECT}_VERSION_MINOR, ${PROJECT}_VERSION_PATCH,
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# and the optional ${PROJECT}_VERSION_FLAVOR.
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#
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# The version string take one of the forms:
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# <major>.<minor>.<patch>
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# <major>.<minor>.<patch>-<flavor>
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function(parse_version FILE PROJECT)
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configure_file(${FILE} "${CMAKE_CURRENT_BINARY_DIR}/CHANGES.md") # Required to re-run cmake on version change
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file(READ ${FILE} CHANGES)
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if(${CHANGES} MATCHES "#+ *([0-9]+)\\.([0-9]+)\\.([0-9]+)(-[a-zA-Z0-9]+)?")
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set(FLAVOR "")
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if(NOT "${CMAKE_MATCH_4}" STREQUAL "")
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string(SUBSTRING ${CMAKE_MATCH_4} 1 -1 FLAVOR)
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endif()
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set("${PROJECT}_VERSION_MAJOR" ${CMAKE_MATCH_1} PARENT_SCOPE)
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set("${PROJECT}_VERSION_MINOR" ${CMAKE_MATCH_2} PARENT_SCOPE)
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set("${PROJECT}_VERSION_PATCH" ${CMAKE_MATCH_3} PARENT_SCOPE)
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set("${PROJECT}_VERSION_FLAVOR" ${FLAVOR} PARENT_SCOPE)
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set("${PROJECT}_VERSION"
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"${CMAKE_MATCH_1}.${CMAKE_MATCH_2}.${CMAKE_MATCH_3}${CMAKE_MATCH_4}"
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PARENT_SCOPE)
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else()
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message(FATAL_ERROR "Unable to parse version from '${FILE}'")
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endif()
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endfunction()
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