brew/Library/Homebrew/formula_path.sh

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# does the quickest output of brew --prefix/--cellar possible for the basic cases:
# - `brew --prefix` (output HOMEBREW_PREFIX)
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# - `brew --cellar` (output HOMEBREW_CELLAR)
# - `brew --prefix <formula>` (output HOMEBREW_PREFIX/opt/<formula>)
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# - `brew --cellar <formula>` (output HOMEBREW_CELLAR/<formula>)
# anything else? delegate to the slower cmd/--prefix.rb and cmd/--cellar.rb
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# HOMEBREW_PREFIX and HOMEBREW_REPOSITORY are set by brew.sh
# shellcheck disable=SC2154
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homebrew-formula-path() {
while [[ "$#" -gt 0 ]]
do
case "$1" in
# check we actually have --prefix and not e.g. --prefixsomething
--prefix)
local prefix="1"
shift
;;
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--cellar)
local cellar="1"
shift
;;
# reject all other flags
-*) return 1 ;;
*)
[[ -n "${formula}" ]] && return 1
local formula="$1"
shift
;;
esac
done
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[[ -z "${prefix}" && -z "${cellar}" ]] && return 1
[[ -n "${prefix}" && -n "${cellar}" ]] && return 1 # don't allow both!
if [[ -z "${formula}" ]]
then
if [[ -n "${prefix}" ]]
then
echo "${HOMEBREW_PREFIX}"
else
echo "${HOMEBREW_CELLAR}"
fi
return 0
fi
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local formula_exists
if [[ -f "${HOMEBREW_REPOSITORY}/Library/Taps/homebrew/homebrew-core/Formula/${formula}.rb" ]]
then
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formula_exists="1"
else
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local formula_path
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formula_path="$(
shopt -s nullglob
echo "${HOMEBREW_REPOSITORY}/Library/Taps"/*/*/{Formula/,HomebrewFormula/,Formula/*/,}"${formula}.rb"
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)"
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[[ -n "${formula_path}" ]] && formula_exists="1"
fi
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if [[ -z "${formula_exists}" &&
-z "${HOMEBREW_NO_INSTALL_FROM_API}" ]]
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then
if [[ -f "${HOMEBREW_CACHE}/api/formula_names.txt" ]] &&
grep -Fxq "${formula}" "${HOMEBREW_CACHE}/api/formula_names.txt"
then
formula_exists="1"
elif [[ -f "${HOMEBREW_CACHE}/api/formula_aliases.txt" ]]
then
while IFS="|" read -r alias_name real_name
do
case "${alias_name}" in
"${formula}")
formula_exists="1"
formula="${real_name}"
break
;;
*) ;;
esac
done <"${HOMEBREW_CACHE}/api/formula_aliases.txt"
fi
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fi
[[ -z "${formula_exists}" ]] && return 1
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if [[ -n "${prefix}" ]]
then
echo "${HOMEBREW_PREFIX}/opt/${formula}"
else
echo "${HOMEBREW_CELLAR}/${formula}"
fi
return 0
}