zig fmt: allow multi-line function headers

[benjif]

Currently if I have a long function header/prototype with lots of parameters, zig fmt will force all of the parameters onto a single line.

e.g.

pub fn sgemv(
    order: Order,
    trans: Trans,
    m: usize,
    n: usize,
    alpha: f32,
    a: []const f32,
    lda: usize,
    x: []const f32,
    x_add: usize,
    beta: f32,
    y: []f32,
    y_add: usize
) void {
    ...
}

... will be changed to:

pub fn sgemv(order: Order, trans: Trans, m: usize, n: usize, alpha: f32, a: []const f32, lda: usize, x: []const f32, x_add: usize, beta: f32, y: []f32, y_add: usize) void {
    ...
}

[hryx]

Add a trailing comma to the final parameter -- that should fix it.

pub fn sgemv(
    order: Order,
    trans: Trans,
    m: usize,
    n: usize,
    alpha: f32,
    a: []const f32,
    lda: usize,
    x: []const f32,
    x_add: usize,
    beta: f32,
    y: []f32,
    y_add: usize,
) void {
    //
}

[benjif]

Interesting, thank you. Has it been decided that this is a mandatory style? Unsure about whether or not to close this.

[hryx]

I believe this style is the result of already-accepted proposals/changes. Here are some relevant issues: #1003, #2181

So I would close it unless you want to bring up a counterargument to the policy or propose an enhancement to it.