The complete source code of IdealIRC http://www.idealirc.org/
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idealirc/CMake/Git.cmake

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# From http://xit0.org/2013/04/cmake-use-git-branch-and-commit-details-in-project/
#
# Produces two self-explanatory variables;
# GIT_BRANCH
# GIT_COMMIT_HASH
#
# Get the current working branch
execute_process(
COMMAND git rev-parse --abbrev-ref HEAD
WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
OUTPUT_VARIABLE GIT_BRANCH
OUTPUT_STRIP_TRAILING_WHITESPACE
)
# Get the latest abbreviated commit hash of the working branch
execute_process(
COMMAND git log -1 --format=%h
WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
OUTPUT_VARIABLE GIT_COMMIT_HASH
OUTPUT_STRIP_TRAILING_WHITESPACE
)