Small World,Big deal

l鼓弄了半天，这时你除了需要hyperref宏包以外，还需要和hyperref一起的xr宏包

将 \usepackage{xr-hyper} 放在 hyperref package的引用前面。

在preamble里面加入 \externaldocument[symbol]{folder/filename}

比如我们这里用 \externaldocument[a,]{folder/filename} ，那么引用时用 see \hyperref[a,eqn:lj-force]{eqn.~\ref*{a,eqn:lj-force}}。

注意引用的文件的编译等也要放在文件夹里，不然无法正确显示。

I : insert from the beginning of the line
A: insert from the end of the line

C-g: report the filename and file status

vim -r : recover from the .swp files, rember to delete the swp file after recovery.

. :repeat command

C-t, C-d: insert or delete an indent in the current line

map ,, : mapping the autocomplete to a handy sequence

:X : keep your files secret, it will need a password to open it. Rember the lower case x is equal to the wq command.

dw: delete a word from the cursor
cw: change a word from the cursor
C-f: pageup
C-b: pagedown

R: goes to –Replace– mode,besides, the Insert key can toggle between the Insert mode and Replace mode.

—————————————————–

V     : linewise visual mode      (prompting -- VISUAL LINE --)
v     : characterwise visual mode (prompting -- VISUAL --)
C-v   : blockwise visual mode     (prompting -- VISUAL BLOCK --)

The Visual mode can also be abandoned by Esc.

In visual mode there are many available operations, among them here are some common and useful ones:

d     : delete
y     : yank
U     : uppercase all characters
u     : lowercase all characters
~     : toggle case
: indent
o     : changing the start of a block
  : indent to left or right a with of SHIFTWIDTH, you can :set shiftwidth=2

---------------------------------search and replace--------------------------------------

The syntax format is

:%s/oldpattern/newpattern/gcI

g             : global (optional)
c             : confirm for every replacement (optional)
I             : smart case (optional)

The first part indicates the range, % means the whole file, and you can define the range of part of the file, as

:2,46/oldpattern/newpattern/gc

In the visual mode, you can mark the range and do the substitution easily.

In the Normal mode, you can search for the word under the cursor by pressing * for the next matchings and # for the previous ones.

—————–Wrap up and reformatting——————–

set the text width

:set textwidth=65

Remember that tw can override wm and they are both zero by the default. With your favorite margin, you can reformat a paragraph by marking a visual block and then typing gq .
Another useful reformat command is J (join, in the Normal mode) which can join the current lines and the next line as one.

————————Complile files———————————

To compile you C code when editing it, :!gcc kernel.c, or :!gcc % to compile the current editing file. Note that % represents the current buffer you edit, i.e., current file.

If you have a Makefile for your program, simply

:make

can do the compilation. Open an error window

:copen

The errors will be prompted in the error window and you can jump to the error location by moving the cursor to the error and hit the Enter.

Diff Function

The diff function can be used when startup with vertical splitting

vim -d arm.c arm.orig.c

Or using horizontal splitting

vim -od arm.c arm.orig.c