Vi&Vim使用技巧

对多行添加注释

例如，选中下面代码片的前四行，并通过在每行的行首添加#号，将它们注释掉：

def foo(a,b):
    for each in (a,b):
        print each
    return a+b
print "2"

最终形成这样的效果：

#def foo(a,b):
# for each in (a,b):
# print each
# return a+b
print "2"

方法：

1. 有现成的插件nerdcommenter可以实现对不同语言添加注释的功能。

2. 只用现成的插件感觉不过瘾的话，利用vi内置的操作同样可以实现效果。

3. Option 1:

** V-blocks
:1 Enter (Go to line 1)
Ctrl-V (V-Block mode)
jjj (Down 3 more lines)
Shift-I (Enter insert mode before the block)

(Insert a ‘#’)

Esc (Back to normal mode)

1. Option #2:

Substitution

:1,4s/^/#/

Breakdown:

Ex command follows
1,4 on lines from 1 through 4
s substitute
/ separator for pieces of the substitution command.
(You can also use a different character, e.g. :)
^ beginning of the line
/ separator

the comment character for python

/ final separator

1. Option #3:

   Repeat application of a macro (source)
   :1 Enter (Go to line 1)
   qa (Start recording on register a)
   Shift-I (Enter insert mode at the beginning of the line

(Add a ‘#’ at the beginning of the line)

Esc (Back to normal mode)
q (Stop recording)

:2,4 normal @a (re-run the macro recorded to register a on lines between 2 and 4)

OR

you can select the lines in visual mode and hit : to automatically populate the Ex line with :’<,’> (a range from the beginning to the end of the visual selection) then type normal @a and hit Enter (source).

Now, whenever you want to comment some lines just re-run the macro recorded to register a on those lines:

:9,22 normal @a (comment out lines 9-22)