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build: give example on complex regexes
This is just to allow the reader to get a quick understanding without necessarily needing to know all the regex intricasies.
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@ -16,7 +16,9 @@ endif()
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# `git describe` annotates the most recent tagged release; for pre-release
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# builds we append that to the dev version.
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if(NVIM_VERSION_PRERELEASE)
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# Extract pre-release info: "v0.8.0-145-g0f9113907" => "145-g0f9113907"
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string(REGEX REPLACE "^v[0-9]+.[0-9]+.[0-9]+-" "" NVIM_VERSION_GIT "${GIT_TAG}")
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# Replace "-" with "+": "145-g0f9113907" => "145+g0f9113907"
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string(REGEX REPLACE "^([0-9]+)-([a-z0-9]+)" "\\1+\\2" NVIM_VERSION_GIT "${NVIM_VERSION_GIT}")
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set(NVIM_VERSION "${NVIM_VERSION}-${NVIM_VERSION_GIT}")
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endif()
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