Vim 向程序员提供的功能：
1. Folding;
(1)Manual Folding, for example,
3zF/2zfj hide three lines in a fold
(2)indent
(3)expr
(4)syntax
(5)diff
(6)marker
2. Auto and smart indenting;
3. Key word and dictionary word completion;
The methods of completion include: Whole line, Current file keywords, dictionary option keywords, thesaurus option keywords, Current and included file keywords, Tags(as in ctags),
Filenames, Macros, Vim command line, User-defined, Omni, Spelling suggestions, complete option keywords.
4. Tags and extended tags;
5. Syntax highlighting;
6. Syntax highlighting authoring(roll your own)
7. Quickfix, Vim' mini-IDE