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.
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
}