本文介绍vim宏以及它的魔法。

宏是什么

vim的宏就是把一系列动作录制起来，然后可以进行播放可以执行同样动作的功能。
它是vim中最具有魔法的操作了。可能会有人觉得.重复操作更具有魔法，但是.只能记 重复上一次命令，能做的事情有限，所以它最多就是最经常使用的命令而已，并没有魔法。

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很多人在使用feedkeys函数的时候会得取不预期的输出，怎么折腾也搞不明白为什么会得到 这样的结果。这篇文章来给大家解疑一下。

feedkeys函数文档

feedkeys({string} [, {mode}])				*feedkeys()*
		Characters in {string} are queued for processing as if they
		come from a mapping or were typed by the user.
		By default the string is added to the end of the typeahead
		buffer, thus if a mapping is still being executed the
		characters come after them.  Use the 'i' flag to insert before
		other characters, they will be executed next, before any
		characters from a mapping.
		The function does not wait for processing of keys contained in
		{string}.
		To include special keys into {string}, use double-quotes
		and "\..." notation |expr-quote|. For example,
		feedkeys("\<CR>") simulates pressing of the <Enter> key. But
		feedkeys('\<CR>') pushes 5 characters.
		If {mode} is absent, keys are remapped.
		{mode} is a String, which can contain these character flags:
		'm'	Remap keys. This is default.
		'n'	Do not remap keys.
		't'	Handle keys as if typed; otherwise they are handled as
			if coming from a mapping.  This matters for undo,
			opening folds, etc.
		'i'	Insert the string instead of appending (see above).
		'x'	Execute commands until typeahead is empty.  This is
			similar to using ":normal!".  You can call feedkeys()
			several times without 'x' and then one time with 'x'
			(possibly with an empty {string}) to execute all the
			typeahead.  Note that when Vim ends in Insert mode it
			will behave as if <Esc> is typed, to avoid getting
			stuck, waiting for a character to be typed before the
			script continues.
		'!'	When used with 'x' will not end Insert mode. Can be
			used in a test when a timer is set to exit Insert mode
			a little later.  Useful for testing CursorHoldI.

		Return value is always 0.

说明文档说了这个函数的使用方式，但是对于大部分人，只理解了一部分，帮而会产生很多 不解的行为。这个函数会把参数中的{string}当前是用户输入的。默认的，它会把string 的内容放到预输入的buffer(下面直接引用说明文档中的typeahead buffer)中。
对于不解行为，主要都是由这个typeahead buffer产生了。这个typeahead buffer并不是我 们所熟悉的vim与文档内容关联的buffer，下面会对它进行详细的说明。很多人认为，只要 一调用feedkeys，它就立刻产生作用。例如下面这个例子：

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