Re: [Qemu-devel] [PATCH v4 1/2] CODING_STYLE: specify the indent rule for multiline code

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 25 Feb 2019 09:25:29 +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.
diffrent from what? I'd use "various styles"

> 
> 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>
> 
> ---
> v4:
>    * widths -> width
>    * add an exception example for function
> 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
> ---
>  CODING_STYLE | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/CODING_STYLE b/CODING_STYLE
> index ec075dedc4..1bccf4f865 100644
> --- a/CODING_STYLE
> +++ b/CODING_STYLE
> @@ -29,6 +29,35 @@ 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 width, align the secondary
> +lines just after the opening parenthesis of the first.
 Probably it's not true for struct/function, they could use 4 spaces indent
 relative to previous line. I'd drop struct as it just follow generic block
 4 spaces rule. And describe possible function variants separately


> +
> +For example:
> +
> +    if (a == 1 &&
> +        b == 2) {
> +
> +    while (a == 1 &&
> +           b == 2) {
> +
> +    do_something(arg1, arg2,
> +                 arg3);
> +
> +One exception for function is indenting following lines relative to function
> +name start:
it's not really exception and used not only with functions, it's basically
generic 4 spaces indent. Another variant I've seen used is
    foo(x, y(z,
             h);
and variations of that


> +
> +    do_something(arg1, arg2,
> +        arg3);
> +
>  2. Line width
>  
>  Lines should be 80 characters; try not to make them longer.