Add std.parseUrl

[jgustie]

Having a std.parseUrl(str) that returns a JSON object with "scheme", "host", "path", "query" and "fragment" fields would be useful for generating configurations where some applications accept parts of the URL as individual fields.

I suppose "host" could be more complicated, e.g. it may be useful to have "host" and "port" separated out, it may be useful to have "hostport" as a single string, have "port" always populated with the default for the "scheme", etc.

[sbarzowski]

With this sort of thing it's good to first have a working implementation in Jsonnet.

FYI I've been working for some time now on a small library which makes parsing things in Jsonnet easier in general.

This RFC describes in detail what can be inside https://tools.ietf.org/html/rfc3986. Splitting the thing once we can assume it's correct is quite easy. The tricky part is making is validating it and making it, compliant in all weird cases. But I guess even quite permissive splitting could be useful.

[toloco]

I'd love to see this moving on :)