brew/Library/Homebrew/cmd/--version.sh

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#: * `--version`, `-v`
#:
#: Print the version numbers of Homebrew, Homebrew/homebrew-core and Homebrew/homebrew-cask (if tapped) to standard output.
# HOMEBREW_CORE_REPOSITORY, HOMEBREW_CASK_REPOSITORY, HOMEBREW_VERSION are set by brew.sh
# shellcheck disable=SC2154
version_string() {
local repo="$1"
if ! [[ -d "${repo}" ]]
then
echo "N/A"
return
fi
local pretty_revision
pretty_revision="$(git -C "${repo}" rev-parse --short --verify --quiet HEAD)"
if [[ -z "${pretty_revision}" ]]
then
echo "(no Git repository)"
return
fi
local git_last_commit_date
git_last_commit_date="$(git -C "${repo}" show -s --format='%cd' --date=short HEAD)"
echo "(git revision ${pretty_revision}; last commit ${git_last_commit_date})"
}
homebrew-version() {
echo "Homebrew ${HOMEBREW_VERSION}"
echo "Homebrew/homebrew-core $(version_string "${HOMEBREW_CORE_REPOSITORY}")"
if [[ -d "${HOMEBREW_CASK_REPOSITORY}" ]]
then
echo "Homebrew/homebrew-cask $(version_string "${HOMEBREW_CASK_REPOSITORY}")"
fi
}