I have wrote the following elisp function. I think it works from my side.
Hopes it's useful for someone else.


(global-set-key [M-f12] 'my_indent_code);;indent code
(defun my_indent_code()
  (interactive)
  ;;remove blank lines
  (goto-char 0)
  (flush-lines "^$")
  (save-buffer)
  (setq current_filename (buffer-name (current-buffer)))
  ;;indent the code, add or remove some space
  (setq commandline "indent ")
  (setq commandline (concat commandline current_filename))
  (shell-command-to-string commandline)
  ;;convert the line endings of text files from DOS style to unix style
  (setq commandline "dos2unix ")
  (setq commandline (concat commandline current_filename))
  (shell-command-to-string commandline)
  ;;reload
  (revert-buffer t t)
)



2008/8/26 filebat Mark <filebat.mark@gmail.com>

> to Peter:
> I think our replace-regex doesn't work well.
> 1) Supposing a code line is "if(s!=0)", it will be changed into "if(s! =
> 0)". That's definitely not the thing we want. The same problem occurs for
> "if (s==0)".
> 2) A line of "strcpy(str, "a=2")", will be changed into "strcpy(str, "a =
> 2").
>
> So we should spend more effort to solve those problems.
>
> -----------------------------------------------------------------------------------------------------------------------
> To David:
> Indent is quite a useful utility. Thanks very much for your suggestion!
> There are still something that doesn't look good for me.
> Such as, script1 will be changed to srcipt2.
> script1
>
> void test(char* str)
> {
>  int i;
> i=    2;
>
> strcpy(str,        "hello");
> }
>
> script2
> void
> test( char* str )
> {
>  int i;
>  i = 2;
>
>  strcpy(str, "hello");
> }
>
>
> But what I want is script3.
> script3:
> void test( char* str )
> {
>  int i;
>  i = 2;
>  strcpy(str, "hello");
> }
>
>
> -----------------------------------------------------------------------------------------------------------------------
> I'am sorry to bother you guys. I just curious how skilled programmers
> indent their codes, to make them look nice. They may have written tons of
> codes, not only C/C++, but also java, python, whatever.
>
>
> 2008/8/26 David Hansen <david.hansen@gmx.net>
>
> On Mon, 25 Aug 2008 21:59:01 +0800 filebat Mark wrote:
>>
>> > I think maybe an elisp function can do this job. I am wondering how to
>> find
>> > this elisp code, cause I don't want to reinvent the wheel.
>>
>> Tried this?  It has tons of options.
>>
>> INDENT(1)
>>
>> NAME
>>       indent  - changes the appearance of a C program by inserting or
>>       deleting whitespace.
>>
>> David
>>
>>
>>
>>
>
>
> --
> Thanks & Regards
>
> Denny Zhang
>
>


-- 
Thanks & Regards

Denny Zhang