# Use --installed to limit to installed packages only
function __fish_print_packages
    set -l args $argv
    argparse --name=__fish_print_packages i/installed -- $argv
    or return

    set -l only_installed 1
    if not set -q _flag_installed
        set -e only_installed
    end

    switch (commandline -ct)
        case '-**'
            return
    end

    __fish_print_apt_packages $args
    and return

    __fish_print_pkg_packages $args
    and return

    __fish_print_pkg_add_packages $args
    and return

    ### BEGIN CACHED RESULTS ###

    __fish_print_pacman_packages $args
    and return

    __fish_print_zypper_packages
    and return

    # Set up cache directory
    set -l xdg_cache_home (__fish_make_cache_dir)
    or return

    # yum is slow, just like rpm, so go to the background
    if type -q -f /usr/share/yum-cli/completion-helper.py

        # If the cache is less than six hours old, we do not recalculate it

        set -l cache_file $xdg_cache_home/.yum-cache.$USER
        if test -f $cache_file
            cat $cache_file
            set -l age (math (date +%s) - (stat -c '%Y' $cache_file))
            set -l max_age 21600
            if test $age -lt $max_age
                return
            end
        end

        # Remove package version information from output and pipe into cache file
        /usr/share/yum-cli/completion-helper.py list all -d 0 -C | sed "s/\..*/\tPackage/" >$cache_file &
        return
    end

    # Rpm is too slow for this job, so we set it up to do completions
    # as a background job and cache the results.

    if type -q -f rpm

        # If the cache is less than five minutes old, we do not recalculate it

        set -l cache_file $xdg_cache_home/.rpm-cache.$USER
        if test -f $cache_file
            cat $cache_file
            set -l age (math (date +%s) - (stat -c '%Y' $cache_file))
            set -l max_age 250
            if test $age -lt $max_age
                return
            end
        end

        # Remove package version information from output and pipe into cache file
        rpm -qa | sed -e 's/-[^-]*-[^-]*$/\t'Package'/' >$cache_file &
        return
    end

    # Eopkg is slow in showing list of available packages

    if type -q -f eopkg

        # If the cache is less than max_age, we do not recalculate it
        # Determine whether to print installed/available packages

        if set -q only_installed
            set -l cache_file $xdg_cache_home/.eopkg-installed-cache.$USER
            if test -f $cache_file
                cat $cache_file
                set -l age (math (date +%s) - (stat -c '%Y' $cache_file))
                set -l max_age 500
                if test $age -lt $max_age
                    return
                end
            end

            # Remove package version information from output and pipe into cache file
            eopkg list-installed -N | cut -d ' ' -f 1 >$cache_file &
            return
        else
            set -l cache_file $xdg_cache_home/.eopkg-available-cache.$USER
            if test -f $cache_file
                cat $cache_file
                set -l age (math (date +%s) - (stat -c '%Y' $cache_file))
                set -l max_age 500
                if test $age -lt $max_age
                    return
                end
            end

            # Remove package version information from output and pipe into cache file
            eopkg list-available -N | cut -d ' ' -f 1 >$cache_file &
            return
        end
    end

    # This completes the package name from the portage tree.
    # True for installing new packages. Function for printing
    # installed on the system packages is in completions/emerge.fish

    # eix is MUCH faster than emerge so use it if it is available
    if type -q -f eix
        eix --only-names "^"(commandline -ct) | cut -d/ -f2
        return
    else
        # FIXME?  Seems to be broken
        if type -q -f emerge
            emerge -s \^(commandline -ct) | string match -r "^\*.*" | cut -d' ' -f3 | cut -d/ -f2
            return
        end
    end

    # port needs caching, as it tends to be slow
    # BSD find is used for determining file age because HFS+ and APFS
    # don't save unix time, but the actual date. Also BSD stat is vastly
    # different from linux stat and converting its time format is tedious
    if type -q -f port
        set -l cache_file $xdg_cache_home/.port-cache.$USER
        if test -e $cache_file
            # Delete if cache is older than 15 minutes
            find "$cache_file" -ctime +15m | awk '{$1=$1;print}' | xargs rm
            if test -f $cache_file
                cat $cache_file
                return
            end
        end
        # Remove trailing whitespace and pipe into cache file
        printf "all\ncurrent\nactive\ninactive\ninstalled\nuninstalled\noutdated" >$cache_file
        port echo all | awk '{$1=$1};1' >>$cache_file &
        cat $cache_file
        return
    end

    if type -q -f opkg
        if set -q only_installed
            opkg list-installed 2>/dev/null | sed -r 's/^([a-zA-Z0-9\-]+) - ([a-zA-Z0-9\-]+)/\1\t\2/g'
            return
        else
            opkg list 2>/dev/null | sed -r 's/^([a-zA-Z0-9\-]+) - ([a-zA-Z0-9\-]+)/\1\t\2/g'
            return
        end
    end

    if type -q -f apk
        if set -q only_installed
            apk info -q
            return
        else
            apk search -q
            return
        end
    end

    # Caches for 5 minutes
    if type -q -f xbps-query
        if not set -q only_installed
            set -l cache_file $xdg_cache_home/.xbps-cache.$USER
            if test -f $cache_file
                set -l age (math (date +%s) - (stat -c '%Y' $cache_file))
                set -l max_age 300
                if test $age -lt $max_age
                    cat $cache_file
                    return
                end
            end
            # prints: <package name>	Package
            xbps-query -Rsl | sed 's/^... \([^ ]*\)-.* .*/\1/; s/$/\t'Package'/' | tee $cache_file
            return
        else
            xbps-query -l | sed 's/^.. \([^ ]*\)-.* .*/\1/' # TODO: actually put package versions in tab for locally installed packages
            return
        end
    end

end