Create couch_lib application

[iilyak]

Overview

This is a cherry-pick of a 845f917 from main into 3.x.

Testing recommendations

Usual ./configure && make would be sufficient since this commit doesn't provide new functionality.

Related Issues or Pull Requests

• Create couch lib #3529

Checklist

• Code is written and works correctly
• Changes are covered by tests
• Any new configurable parameters are documented in rel/overlay/etc/default.ini
• A PR for documentation changes has been made in https://github.com/apache/couchdb-documentation

[nickva]

Wonder if it would make sense to add/move some functions to it as it seems a bit odd to commit an empty application. Or, do you think it's better to first have the app first, then plan on moving helper functions into it?

Just afraid most committers won't even know about it and will just keep adding functions to couch_util and the app will just stay empty for quite a while.

[iilyak]

Wonder if it would make sense to add/move some functions to it as it seems a bit odd to commit an empty application. Or, do you think it's better to first have the app first, then plan on moving helper functions into it?

Just afraid most committers won't even know about it and will just keep adding functions to couch_util and the app will just stay empty for quite a while.

The original PR #3529 contained some functions.

• couch_lib_parse:parse_boolean/1 - parses given string or binary into Erlang's boolean() type
• couch_lib_parse:parse_integer/1 - parses given string as Erlang's integer() type
• couch_lib_parse:parse_non_neg_integer/1 - parses given string as Erlang's non_neg_integer() type ([0..infinity))

However I was afraid pulling them here since there is no immediate need in them.

[rnewson]

There is nothing in couch_lib, what is the value of this work?

[rnewson]

until this actually does something, -1.