cc-mode indent, exception for long lines

cc-mode indent, exception for long lines

[Matt Armstrong]

I like to keep my C code lines to 80 columns, for easier
editing/printing.

But, sometimes I have a long string constant or identifier, and
cc-mode's indentation isn't optimal.  E.g.

    if (ReallyLongFunctionName(AnotherReallyLongFunctionName("a really long string constant") 
    {
    }

I haven't been able to get cc-mode to help me much here.  It'd be great
if it had a way to sense that the result of an indentation will go
beyond N columns and go into an alternate mode that results in something
like this:

    if (ReallyLongFunctionName(
                AnotherReallyLongFunctionName(
                    "a really long string constant") 
    {
    }

(the above indentation is the "vim" editor's default indentation -- the
first line after a paren is indented 8 spaces, all subsequent lines 8+4
spaces).

Any tips?

-- 
matt

Re: cc-mode indent, exception for long lines

[Benjamin Riefenstahl]

Hi Matt,


Matt Armstrong <matt@lickey.com> writes:
> I like to keep my C code lines to 80 columns, for easier
> editing/printing.

Lots of people agree with that rule ;-). 

> But, sometimes I have a long string constant or identifier, and
> cc-mode's indentation isn't optimal.  E.g.
> 
>     if (ReallyLongFunctionName(AnotherReallyLongFunctionName("a really long string constant") 
>     {
>     }

? There is no problem with indentation here, is there?  What you seem
to want is automatic insertion of line ends for wrapping.  cc-mode
doesn't do that, I admit.  I'm not sure I would want it either.

>     if (ReallyLongFunctionName(
>                 AnotherReallyLongFunctionName(
>                     "a really long string constant") 
>     {
>     }

With my settings and adding the missing parentheses to your code I get

        if (ReallyLongFunctionName(
                    AnotherReallyLongFunctionName(
                            "a really long string constant")))
        {
        }

Which is pretty near to what you seem to want.  I did have to add line
breaks manually, of course. 


so long, benny

Re: cc-mode indent, exception for long lines

[maierh]

Matt Armstrong <matt@lickey.com> writes:

> I like to keep my C code lines to 80 columns, for easier
> editing/printing.
>
> But, sometimes I have a long string constant or identifier, and
> cc-mode's indentation isn't optimal.  E.g.
>
>     if (ReallyLongFunctionName(AnotherReallyLongFunctionName("a really long string constant") 
>     {
>     }
>
> I haven't been able to get cc-mode to help me much here.  It'd be great
> if it had a way to sense that the result of an indentation will go
> beyond N columns and go into an alternate mode that results in something
> like this:
>
>     if (ReallyLongFunctionName(
>                 AnotherReallyLongFunctionName(
>                     "a really long string constant") 
>     {
>     }

I am using this. Looks closely to your example:

  ;; (c-set-offset 'arglist-intro '+)

  if (ReallyLongFunctionName(
	AnotherReallyLongFunctionName(
	  "a really long string constant") 
	{
	}