转自<http://blog.chinaunix.net/uid-25885064-id-3363736.html>
astyle是一个开源工具，它可以方便的将代码格式化成自己想要的样式而不必人工修改。可以到网站（http://astyle.sourceforge.net/）上下载源码自己编译，也可以使用指令（apt-get install astyle）安装。
下面介绍一下astyle的简单使用。例如有以下的源码：
#include <stdio.h>
int main()
{int i;printf("Just a test!\n");for(i=0;i<10;++i)printf("%d\n",i);}return 0;}
然后在终端下输入一下指令：
- astyle test1.c
效果如下：
#include <stdio.h>
int main()
{
int i;
printf("Just a test!\n");
for(i=0; i<10; ++i) {
printf("%d\n",i);
}
return 0;
}
当然也可以加上一些选项，例如“astyle --style=bsd test1.c”，“ astyle --style=gnu test1.c”等等。
在vim中的命令模式下，可以使用下面的某一种方式来格式化代码。
%!astyle (simple case - astyle default mode is C/C++)
或者
%!astyle --mode=c --style=ansi -s2 (ansi C++ style, use two spaces per indent level)
或者
%!astyle --mode=c --style=ansi -s2 (ansi C++ style, use two spaces per indent level)
为方便使用，可以把它写成一个脚本，代码如下：
#! /bin/bash
for f in $(find . -name '*.c' -or -name '*.cpp' -type f)
do
astyle $f
done
在格式化完代码后，会生成一个后缀为orig的文件，将脚本更改如下：
#! /bin/bash
for f in $(find . -name '*.c' -or -name '*.cpp' -or -name '*.h' -type f)
do
astyle $f
done
# after formate the code,we need to rm '*.orig' files
for f in $(find . -name '*.orig' -type f)
do
rm $f
done
astyle其使用说明如下：
Usage : astyle [options] Source1.cpp Source2.cpp [...]
astyle [options] < Original > Beautified
When indenting a specific file, the resulting indented file RETAINS the
original file-name. The original pre-indented file is renamed, with a
suffix of ".orig" added to the original filename.
Wildcards (* and ?) may be used in the filename.
A 'recursive' option can process directories recursively.
By default, astyle is set up to indent C/C++/C#/Java files, with four
spaces per indent, a maximal indentation of 40 spaces inside continuous
statements, a minimum indentation of eight spaces inside conditional
statements, and NO formatting options.
Option's Format:
----------------
Long options (starting with '--') must be written one at a time.
Short options (starting with '-') may be appended together.
Thus, -bps4 is the same as -b -p -s4.
Predefined Style Options:
-------------------------
--style=allman OR --style=ansi OR --style=bsd OR -A1
Allman style formatting/indenting.
Broken brackets.
--style=java OR -A2
Java style formatting/indenting.
Attached brackets.
--style=k&r OR --style=k/r OR -A3
Kernighan & Ritchie style formatting/indenting.
Linux brackets.
--style=stroustrup OR -A4
Stroustrup style formatting/indenting.
Stroustrup brackets.
--style=whitesmith OR -A5
Whitesmith style formatting/indenting.
Broken, indented brackets.
Indented class blocks and switch blocks.
--style=banner OR -A6
Banner style formatting/indenting.
Attached, indented brackets.
Indented class blocks and switch blocks.
--style=gnu OR -A7
GNU style formatting/indenting.
Broken brackets, indented blocks, indent is 2 spaces.
--style=linux OR -A8
GNU style formatting/indenting.
Linux brackets, indent is 8 spaces.
--style=horstmann OR -A9
Horstmann style formatting/indenting.
Horstmann brackets, indented switches, indent is 3 spaces.
--style=1tbs OR --style=otbs OR -A10
One True Brace Style formatting/indenting.
Linux brackets, add brackets to all conditionals.
Tab and Bracket Options:
------------------------
default indent option
If no indentation option is set,
the default option of 4 spaces will be used.
--indent=spaces=# OR -s#
Indent using # spaces per indent. Not specifying #
will result in a default of 4 spaces per indent.
--indent=tab OR --indent=tab=# OR -t OR -t#
Indent using tab characters, assuming that each
tab is # spaces long. Not specifying # will result
in a default assumption of 4 spaces per tab.
--indent=force-tab=# OR -T#
Indent using tab characters, assuming that each
tab is # spaces long. Force tabs to be used in areas
Astyle would prefer to use spaces.
default brackets option
If no brackets option is set,
the brackets will not be changed.
--brackets=break OR -b
Break brackets from pre-block code (i.e. ANSI C/C++ style).
--brackets=attach OR -a
Attach brackets to pre-block code (i.e. Java/K&R style).
--brackets=linux OR -l
Break definition-block brackets and attach command-block
brackets.
--brackets=stroustrup OR -u
Attach all brackets except function definition brackets.
--brackets=horstmann OR -g
Break brackets from pre-block code, but allow following
run-in statements on the same line as an opening bracket.
Indentation options:
--------------------
--indent-classes OR -C
Indent 'class' blocks, so that the inner 'public:',
'protected:' and 'private: headers are indented in
relation to the class block.
--indent-switches OR -S
Indent 'switch' blocks, so that the inner 'case XXX:'
headers are indented in relation to the switch block.
--indent-cases OR -K
Indent case blocks from the 'case XXX:' headers.
Case statements not enclosed in blocks are NOT indented.
--indent-brackets OR -B
Add extra indentation to '{' and '}' block brackets.
--indent-blocks OR -G
Add extra indentation entire blocks (including brackets).
--indent-namespaces OR -N
Indent the contents of namespace blocks.
--indent-labels OR -L
Indent labels so that they appear one indent less than
the current indentation level, rather than being
flushed completely to the left (which is the default).
--indent-preprocessor OR -w
Indent multi-line #define statements.
--indent-col1-comments OR -Y
Indent line comments that start in column one.
--max-instatement-indent=# OR -M#
Indent a maximal # spaces in a continuous statement,
relative to the previous line.
--min-conditional-indent=# OR -m#
Indent a minimal # spaces in a continuous conditional
belonging to a conditional header.
Padding options:
--------------------
--break-blocks OR -f
Insert empty lines around unrelated blocks, labels, classes, ...
--break-blocks=all OR -F
Like --break-blocks, except also insert empty lines
around closing headers (e.g. 'else', 'catch', ...).
--pad-oper OR -p
Insert space paddings around operators.
--pad-paren OR -P
Insert space padding around parenthesis on both the outside
and the inside.
--pad-paren-out OR -d
Insert space padding around parenthesis on the outside only.
--pad-paren-in OR -D
Insert space padding around parenthesis on the inside only.
--pad-header OR -H
Insert space padding after paren headers (e.g. 'if', 'for'...).
--unpad-paren OR -U
Remove unnecessary space padding around parenthesis. This
can be used in combination with the 'pad' options above.
--delete-empty-lines OR -x
Delete empty lines within a function or method.
It will NOT delete lines added by the break-blocks options.
--fill-empty-lines OR -E
Fill empty lines with the white space of their
previous lines.
Formatting options:
-------------------
--break-closing-brackets OR -y
Break brackets before closing headers (e.g. 'else', 'catch', ...).
Use with --brackets=attach, --brackets=linux,
or --brackets=stroustrup.
--break-elseifs OR -e
Break 'else if()' statements into two different lines.
--add-brackets OR -j
Add brackets to unbracketed one line conditional statements.
--add-one-line-brackets OR -J
Add one line brackets to unbracketed one line conditional
statements.
--keep-one-line-blocks OR -O
Don't break blocks residing completely on one line.
--keep-one-line-statements OR -o
Don't break lines containing multiple statements into
multiple single-statement lines.
--convert-tabs OR -c
Convert tabs to the appropriate number of spaces.
--align-pointer=type OR -k1
--align-pointer=middle OR -k2
--align-pointer=name OR -k3
Attach a pointer or reference operator (* or &) to either
the operator type (left), middle, or operator name (right).
--mode=c
Indent a C or C++ source file (this is the default).
--mode=java
Indent a Java source file.
--mode=cs
Indent a C# source file.
Other options:
--------------
--suffix=####
Append the suffix #### instead of '.orig' to original filename.
--suffix=none OR -n
Do not retain a backup of the original file.
--options=####
Specify an options file #### to read and use.
--options=none
Disable the default options file.
Only the command-line parameters will be used.
--recursive OR -r OR -R
Process subdirectories recursively.
--exclude=####
Specify a file or directory #### to be excluded from processing.
--errors-to-stdout OR -X
Print errors and help information to standard-output rather than
to standard-error.
--preserve-date OR -Z
The date and time modified will not be changed in the formatted file.
--verbose OR -v
Verbose mode. Extra informational messages will be displayed.
--formatted OR -Q
Formatted display mode. Display only the files that have been formatted.
--quiet OR -q
Quiet mode. Suppress all output except error messages.
--lineend=windows OR -z1
--lineend=linux OR -z2
--lineend=macold OR -z3
Force use of the specified line end style. Valid options
are windows (CRLF), linux (LF), and macold (CR).
--version OR -V
Print version number.
--help OR -h OR -?
Print this help message.
Default options file:
---------------------
Artistic Style looks for a default options file in the
following order:
1. The contents of the ARTISTIC_STYLE_OPTIONS environment
variable if it exists.
2. The file called .astylerc in the directory pointed to by the
HOME environment variable ( i.e. $HOME/.astylerc ).
3. The file called astylerc in the directory pointed to by the
USERPROFILE environment variable ( i.e. %USERPROFILE%\astylerc ).
If a default options file is found, the options in this file
will be parsed BEFORE the command-line options.
Long options within the default option file may be written without
the preliminary '--'.