本文详细解释了Vim中为何某些映射会包含冒号，以及如何通过映射实现特定的功能，例如在视觉选择模式下使用F键启动一系列命令。文章深入探讨了Vim映射的语法和工作原理。
Why do some Vim mappings include after a colon?
That isn’t part of the syntax for the onoremap command, that is explaining what a particular mapping does. That mapping is:
onoremap <silent> F :<C-U>normal! 0f(hviw<CR>
So, when the F key is used while an operator is pending vim will replace that with the bits in the next argument to the onoremap command. That starts with a : to begin an ex mode command. If there is a visual selection when the mapping is used, vim will automatically insert the range '<,'>so that the following ex command will apply to the visual selection, leaving the command line looking like:
:'<,'>
The <C-U> in the mapping tells vim that after the : is entered the Control+U combination should be used to clear the command line, eliminating the automatically inserted range leaving the command line looking like:
:
Then the remainder of the mapping is used.
You can see this for yourself by using V to begin a line-wise visual selection, then : to start entering a command. The range will show up, you can then use Control+U to clear it just as the example mapping does.
The portion of vim help that contains that mapping explains the remainder of it.
扫一扫
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
