How can I configure shortcut keys in all modes of vim?

Question

I want to configure a shortcut key that can be used in both edit mode and normal mode, usually two commands are required:

:nnoremap <C-s> :w<cr>
:inoremap <C-s> <esc>:w<cr>a

Is there any way to combine them into one instruction that can act on multiple modes at the same time?

Answer 1

:help map-table:

         Mode  | Norm | Ins | Cmd | Vis | Sel | Opr | Term | Lang |
Command        +------+-----+-----+-----+-----+-----+------+------+
[nore]map      | yes  |  -  |  -  | yes | yes | yes |  -   |  -   |
n[nore]map     | yes  |  -  |  -  |  -  |  -  |  -  |  -   |  -   |
[nore]map!     |  -   | yes | yes |  -  |  -  |  -  |  -   |  -   |
i[nore]map     |  -   | yes |  -  |  -  |  -  |  -  |  -   |  -   |
c[nore]map     |  -   |  -  | yes |  -  |  -  |  -  |  -   |  -   |
v[nore]map     |  -   |  -  |  -  | yes | yes |  -  |  -   |  -   |
x[nore]map     |  -   |  -  |  -  | yes |  -  |  -  |  -   |  -   |
s[nore]map     |  -   |  -  |  -  |  -  | yes |  -  |  -   |  -   |
o[nore]map     |  -   |  -  |  -  |  -  |  -  | yes |  -   |  -   |
t[nore]map     |  -   |  -  |  -  |  -  |  -  |  -  | yes  |  -   |
l[nore]map     |  -   | yes | yes |  -  |  -  |  -  |  -   | yes  |

shows that Vim has *map commands that cover more than one mode but it doesn't a have one that covers all modes. You can thus cover all modes with:

• :map,
• :map!,
• :tmap,
• :lmap,

and you must use two :*map commands for normal mode and insert mode.

But the RHS of your two mappings are not identical so, even if such a :*map command existed, you couldn't use it anyway.