[vim/vim] Add a new attribute to `command` and offer functions to change Vim-modes more free. (Issue #14157)

[appleWhiteMm]

Add a new attribute to command and offer some functions to change Vim-modes more free.

I want to use a command to accomplish these:

1. Stay in to the command-line mode after running the command;
2. And the put a new command in the command-line without leaving the command-line mode -- so I can do some (casual) edit to the new command before execute it manually or by setcmdline().

But the problem: after running the Vim command, Vim will enter into the normal mode automatically, in which setcmdline() takes no effect.

The alternatives I've considered, but I prefer not to adopt them for some personal reasions:

• Using feedkeys(): it's hacky;
• Using map, setcmdline(): for example, cnoremap kk <Cmd>call setcmdline(':echon 1')<CR>: I don't want use map, but just want to use the "command" way!
• Using input(): it cannot lead to the command-line mode.
• Using -nargs attribute of command: it's too rigid to make make changes to the command content.

So, the feature requests or solutions I'd like are:

• Offering a command( for example, :startcmdline, just like :startinsert) and a function( for example, setcmdmode(), just like setcmdline()) to enter into and stay in the command-line mode, by which user can use setcmdline() to input some new commands.
  • May setnormalmode(), setinsertmode() are also needed.
• Offering an new attribute to command, to make command work like <Cmd> -- it begins a "new command mapping", and executes the command directly without changing modes.

--Thanks for the valuable contributions to Vim!

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