bash和zsh的自动补全

actions_and_arguments = [
    {
        'action': ACTION_ADD,
        'help': 'Subscribe bangumi.',
        'arguments': [
            {'dest': 'name',
             'kwargs': dict(metavar='name', type=unicode_, nargs='+',
                            help='Bangumi name'), },
            {'dest': '--episode',
             'kwargs': dict(metavar='episode',
                            help='Add bangumi and mark it as specified episode.',
                            type=int), },
        ]
    },
    {
        'action': ACTION_DELETE,
        'help': 'Unsubscribe bangumi.',
        'arguments': [
            {'dest': '--name',
             'kwargs': dict(metavar='name', nargs='+', type=unicode_,
                            help='Bangumi name to unsubscribe.'), },
            {'dest': '--batch',
             'kwargs': dict(action='store_true', help='No confirmation.'), },
        ]
    }]

export var=1
echo "$var" # 1
echo "$var 233" # 1 233
echo '$var' # $var
echo "`ls`" # 输出ls命令的输出

complete --help
complete: complete [-abcdefgjksuv] [-pr] [-DE] [-o option] [-A action]
[-G globpat] [-W wordlist] [-F function] [-C command] [-X filterpat]
[-P prefix] [-S suffix] [name ...]
    Specify how arguments are to be completed by Readline.

    For each NAME, specify how arguments are to be completed.  If no options
    are supplied, existing completion specifications are printed in a way that
    allows them to be reused as input.

    Options:
      -p        print existing completion specifications in a reusable format
      -r        remove a completion specification for each NAME, or, if no
                NAMEs are supplied, all completion specifications
      -D        apply the completions and actions as the default for commands
                without any specific completion defined
      -E        apply the completions and actions to "empty" commands --
                completion attempted on a blank line

    When completion is attempted, the actions are applied in the order the
    uppercase-letter options are listed above.  The -D option takes
    precedence over -E.

    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.

_bgmi() {
    local pre cur action
    local actions bangumi config
    actions="add delete update cal config filter fetch download list mark search source complete"
    config="BANGUMI_MOE_URL SAVE_PATH DOWNLOAD_DELEGATE MAX_PAGE TMP_PATH DANMAKU_API_URL"
    COMPREPLY=()

    pre=${COMP_WORDS[COMP_CWORD-1]}
    cur=${COMP_WORDS[COMP_CWORD]}
    if [ $COMP_CWORD -eq 1 ]; then
        COMPREPLY=( $( compgen -W "$actions" -- $cur ) )
    else
        action=${COMP_WORDS[1]}

        case "$action" in

            update )
            local opts
            opts="--download -d --not-ignore"
            COMPREPLY=( $( compgen -W "$opts" -- $cur ) )
            return 0
            ;;

            filter )
            local opts
            opts="--subtitle --include --exclude --regex"
            COMPREPLY=( $( compgen -W "$opts" -- $cur ) )
            return 0
            ;;

            config )
            COMPREPLY=( $( compgen -W "$config" -- $cur ) )
            return 0
            ;;

            cal )
            local opts
            opts="--today -f --force-update --download-cover --no-save"
            COMPREPLY=( $( compgen -W "$opts" -- $cur ) )
            return 0
            ;;

            source )
            local source
            source="bangumi_moe mikan_project dmhy"
            COMPREPLY=( $( compgen -W "$source" -- $cur ) )
            return 0
            ;;

            search )
            local opts
            opts="--count --regex-filter --download --dupe"
            COMPREPLY=( $( compgen -W "$opts" -- $cur ) )
            return 0
            ;;

            download )
            local opts
            opts="--list --mark --status"
            COMPREPLY=( $( compgen -W "$opts" -- $cur ) )
            return 0
            ;;

        esac

    fi

}
complete -F _bgmi bgmi

# run `eval "$(bgmi complete)"` in your bash

$ compgen --help
compgen: compgen [-abcdefgjksuv] [-o option] [-A action]
 [-G globpat] [-W wordlist]  [-F function] [-C command]
 [-X filterpat] [-P prefix] [-S suffix] [word]

    Display possible completions depending on the options.

    Intended to be used from within a shell function generating possible
    completions.  If the optional WORD argument is supplied, matches against
    WORD are generated.

    Exit Status:
    Returns success unless an invalid option is supplied or an error occurs.

_bgmi(){

    if [[ ${#words} -le 2 ]]
            then
        _alternative \
            'action:action options:((add\:"Subscribe bangumi." delete\:"Unsubscribe bangumi." list\:"List subscribed bangumi." filter\:"Set bangumi fetch filter." update\:"Update bangumi calendar and subscribed bangumi episode." cal\:"Print bangumi calendar." config\:"Config BGmi." mark\:"Mark bangumi episode." download\:"Download manager." fetch\:"Fetch bangumi." search\:"Search torrents from data source by keyword" source\:"Select date source bangumi_moe or mikan_project" install\:"Install BGmi front / admin / download delegate" upgrade\:"Check update." history\:"List your history of following bangumi" ))'
    fi

    if [[ ${words[(i)cal]} -le ${#words} ]]
        then
        _alternative \
        'cal:cal options:((--today\:"Show bangumi calendar for today." -f\:"Get the newest bangumi calendar from bangumi.moe." --force-update\:"Get the newest bangumi calendar from bangumi.moe." --download-cover\:"Download the cover to local" --no-save\:"Do not save the bangumi data when force update." ))'
    fi

}

compdef _bgmi bgmi

#usage: eval "$(bgmi complete)"
#if you are using windows, cygwin or babun, try `eval "$(bgmi complete|dos2unix)"`

ubuntu@VM-189-243-ubuntu ~ $ bgmi cal -
--download-cover      -- Download the cover to local
--force-update    -f  -- Get the newest bangumi calendar from bangumi.moe.
--no-save             -- Do not save the bangumi data when force update.
--today               -- Show bangumi calendar for today.