Eli Zaretskii <eliz@gnu.org> writes:

>> From: Hong Xu <hong@topbug.net>
>> Date: Sat, 30 May 2015 01:28:13 -0700
>> 
>> Currently it seems that c-indent-line-region ignores the value of
>> indent-tabs-mode. For example, I have the following in a buffer
>> 
>>     int main()
>>     {
>>     <Tab>int x;
>>     }
>> 
>> and my indent-tabs-mode is nil. If 8 spaces is what expected, calling
>> c-indent-line-or-region would do nothing. However, if it's not aligned
>> 
>>     int main()
>>     {
>>     <Tab>   int x;
>>     }
>> 
>> calling c-indent-line-or-region would correct the tab with appropriate
>> number of spaces.
>> 
>> Is there a different line indentation function which respects
>> indent-tabs-mode even the line is already aligned?
>
> You are using the wrong command.  You should use untabify to convert
> tabs to spaces, or tabify to do the opposite.

Thanks. Is there a single command to do formatting though? I think
people want to format the line more than simply "indent" the line.

Hong