Format json structs

[jonasdiemer]

Hi,

this is a prototype to simplify formatting/printing of structs that contain strings (which fall back to list of characters using the default formatter). It uses the specifier 'j' to json.stringify the struct.

Please consider this a "request for comment" - is this a good idea? Alternatively, maybe enable use of 's' specifier to format structs as ZON (with "proper" handling of strings)?

The rationale is that I think it's rather common to debug.print structs that contain strings (e.g. HTTP responses), and the default behavior with strings as character lists is clumsy.

Looking forward to comments.

[rohlem]

I believe the formatter function std.json.fmt already exists exactly for this purpose.
It takes any argument and wraps it with an std.fmt.Formatter specialization that provides an appropriate format method.
Current usage example: std.log.warn("{}", .{std.json.fmt(.{.a = "asdf", .x = 30}, .{})}).

[jonasdiemer]

Thanks, for some reason I only found json.stringify (which needs a writer).

Still, for the proposal feels more convenient:

std.debug.print("json: {}\n", .{std.json.fmt(x, .{})});

vs

std.debug.print("struct: {j}\n", .{x});