Add convenience constructor to HTTPServerSettings.

[s-ludwig]

Allows to specify the bind interface and port as a single constructor argument

[wilzbach]

I like this - LGTM!

A future extension might accept commas to allow multiple addresses, though I highly doubt that this is a common use case and would need to be part of the convenience constructor.

[s-ludwig]

Something still appears to be wrong with CodeCov - it doesn't pick up the unit test that is added by this patch at all: https://codecov.io/gh/rejectedsoftware/vibe.d/compare/3048f34149ecbd1fdd0362cebe0432e65105e008...4517e3769887f8912df66a8527479e43188aa589/src/http/vibe/http/server.d#L642

[wilzbach]

Something still appears to be wrong with CodeCov - it doesn't pick up the unit test that is added by this patch at all

It's most likely a problem on our side - one can download the uploaded report if one clicks on a respective commit and then on the "Build" tab:

https://codecov.io/gh/rejectedsoftware/vibe.d/commit/4517e3769887f8912df66a8527479e43188aa589/build

I guess a first problem is that we don't merge the coverage files as they seem to be in different folder:

> grep "server.lst" 8846e4fb-15c9-4040-9693-f2b13f93840d.txt
# path=tests/args/..-..-http-vibe-http-server.lst
# path=tests/dirwatcher/..-..-http-vibe-http-fileserver.lst
# path=tests/dirwatcher/..-..-http-vibe-http-server.lst
# path=tests/mongodb/..-..-http-vibe-http-server.lst
# path=tests/redis/..-..-http-vibe-http-server.lst
# path=tests/rest/..-..-http-vibe-http-server.lst
# path=tests/restclient/..-..-http-vibe-http-fileserver.lst
# path=tests/restclient/..-..-http-vibe-http-server.lst
# path=tests/restcollections/..-..-http-vibe-http-fileserver.lst
# path=tests/restcollections/..-..-http-vibe-http-server.lst
# path=tests/tcpproxy/..-..-http-vibe-http-server.lst
# path=tests/tls/..-..-http-vibe-http-server.lst
# path=tests/vibe.http.client.1389/..-..-http-vibe-http-server.lst
# path=tests/vibe.http.client.1426/..-..-http-vibe-http-server.lst
# path=tests/vibe.http.server.1388/..-..-http-vibe-http-server.lst
# path=tests/vibe.http.server.1721/..-..-http-vibe-http-server.lst
# path=tests/vibe.http.server.host-header/..-..-http-vibe-http-server.lst
# path=tests/vibe.http.websocket/..-..-http-vibe-http-server.lst
# path=tests/vibe.web.rest.1125/..-..-http-vibe-http-fileserver.lst
# path=tests/vibe.web.rest.1125/..-..-http-vibe-http-server.lst
# path=tests/vibe.web.rest.1140/..-..-http-vibe-http-fileserver.lst
# path=tests/vibe.web.rest.1140/..-..-http-vibe-http-server.lst
# path=tests/vibe.web.rest.1230/..-..-http-vibe-http-fileserver.lst
# path=tests/vibe.web.rest.1230/..-..-http-vibe-http-server.lst
# path=tests/vibe.web.rest.auth/..-..-http-vibe-http-server.lst
# path=tests/vibe.web.web.auth/..-..-http-vibe-http-server.lst
# path=tests/vibe.web.web/..-..-http-vibe-http-server.lst
# path=http-vibe-http-server.lst
# path=http-vibe-http-fileserver.lst

This can be done with dmd_coverDestPath.

However, I don't know why in all of 22 server files, there's none which coverage:

>  grep -A10 -i "this(string bind_string)" 8846e4fb-15c9-4040-9693-f2b13f93840d.txt | less
0000000|        this(string bind_string)
       |        @safe {
0000000|                this();
       |
0000000|                if (bind_string.startsWith('[')) {
0000000|                        auto idx = bind_string.indexOf(']');
0000000|                        enforce(idx > 0, "Missing closing bracket for IPv6 address.");
0000000|                        bindAddresses = [bind_string[1 .. idx]];
0000000|                        bind_string = bind_string[idx+1 .. $];
       |
0000000|                        enforce(bind_string.length == 0 || bind_string.startsWith(':'),

Not sure why the all server.lst are effectively empty - dub test :http -b unittest-cov --build-mode=singleFile --force works (and yields a covered lst file) on my machine.