Re: [Qemu-devel] [PATCH v3 1/2] CODING_STYLE: specify the indent rule for multiline code

[Igor Mammedov <imammedo@redhat.com>]

On Wed, 20 Feb 2019 11:15:56 +0800
Wei Yang <richardw.yang@linux.intel.com> wrote:

> We didn't specify the indent rule for multiline code here, which may
> mislead users. And in current code, the code use different rules.
> 
> Add this rule in CODING_STYLE to make sure this is clear to every one.
> 
> Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
> Suggested-by: Igor Mammedov <imammedo@redhat.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> 
> ---
> v3:
>    * misleading -> mislead
>    * add comma after arg2 in example
> v2:
>    * rephrase changelog suggested by Eric Blake
>      - remove one redundant line
>      - fix some awkward grammar
>      - add { ; at the end of example
> 
> c1
> ---
>  CODING_STYLE | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/CODING_STYLE b/CODING_STYLE
> index ec075dedc4..1359f9ab81 100644
> --- a/CODING_STYLE
> +++ b/CODING_STYLE
> @@ -29,6 +29,29 @@ Spaces of course are superior to tabs because:
>  
>  Do not leave whitespace dangling off the ends of lines.
>  
> +1.1 Multiline Indent
> +
> +There are several places where indent is necessary:
> +
> + - struct definition
> + - if/else
> + - while/for
> + - function definition & call
> +
> +When breaking up a long line to fit within line widths, align the secondary
s/widths/width/

> +lines just after the opening parenthesis of the first.
> +
> +For example:
> +
> +    if (a == 1 &&
> +        b == 2) {
> +
> +    while (a == 1 &&
> +           b == 2) {
> +
> +    do_something(arg1, arg2,
> +                 arg3);
> +

there is also another widely used acceptable pattern
  func_name(arg1, arg2,
      arg3)

where we indent relative to function name start
(sound weird to me but I'm not sure how to word it properly)

>  2. Line width
>  
>  Lines should be 80 characters; try not to make them longer.