function fish_load_package_manager \
    --description "Load package-manager-specific aliases, abbreviations and functions"

    if test (count $argv) -ne 1
        echo "Usage: fish_load_package_manager <package-manager>" >&2
        return 1
    end

    set -l pkg $argv[1]

    set -l common_dir $__fish_sysconf_dir/pkg/common
    set -l pkg_dir $__fish_sysconf_dir/pkg/$pkg

    if not test -d $pkg_dir
        echo "fish_load_package_manager: '$pkg' not found." >&2
        return 1
    end

    # Common

    test -f $common_dir/01_aliases.fish
    and source $common_dir/01_aliases.fish

    test -f $common_dir/02_abbreviations.fish
    and source $common_dir/02_abbreviations.fish

    if test -d $common_dir/functions
        set -a fish_function_path $common_dir/functions
    end

    # Package-manager-specific

    test -f $pkg_dir/01_aliases.fish
    and source $pkg_dir/01_aliases.fish

    test -f $pkg_dir/02_abbreviations.fish
    and source $pkg_dir/02_abbreviations.fish

    if test -d $pkg_dir/functions
        set -a fish_function_path $pkg_dir/functions
    end
end