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prezto/modules/command-not-found/init.zsh

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#
# Displays installation information for not found commands.
#
# Authors:
# Joseph Jon Booker <joe@neoturbine.net>
# Indrajit Raychaudhuri <irc+code@indrajit.com>
#
# Load command-not-found on Debian-based distributions.
if [[ -s '/etc/zsh_command_not_found' ]]; then
source '/etc/zsh_command_not_found'
# Load command-not-found on Arch Linux-based distributions.
elif [[ -s '/usr/share/doc/pkgfile/command-not-found.zsh' ]]; then
source '/usr/share/doc/pkgfile/command-not-found.zsh'
# Load command-not-found on macOS when Homebrew tap is configured.
# To avoid performance penalty, we do not use Homebrew's ruby based command
# lookup mechanism (viz., `brew command command-not-found-init`) and instead
# `find` it ourselves from `TAP_DIRECTORY` defined internally in Homebrew.
elif (( $+commands[brew] )); then
cnf_command="$(brew --repository 2> /dev/null)"/Library/Taps/homebrew/homebrew-command-not-found/cmd/brew-command-not-found-init.rb
if [[ -s "$cnf_command" ]]; then
cache_file="${TMPDIR:-/tmp}/prezto-brew-command-not-found-cache.$UID.zsh"
if [[ "$cnf_command" -nt "$cache_file" \
|| "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" \
|| ! -s "$cache_file" ]]; then
# brew command-not-found-init is slow; cache its output.
brew command-not-found-init >! "$cache_file" 2> /dev/null
fi
source "$cache_file"
unset cache_file
fi
unset cnf_command
# Return if requirements are not found.
else
return 1
fi