Requs syntax exception: conditional use case branches

[antonxt]

In thindeck project in #64 @yegor256 said that "when" cannot be used to define contitional branches of use case flows. "When" could only be used for exceptional flows.

Therefore, the only way left to define conditions is inside informals, like this (the condition is defined as "If the system detected changes after last pull"):

Repository is "a repository".
Container is "a container".

UC2 where User registers Repository:
    1. The system reads the repo "periodically (every 5 minutes) pulling the changes from repository remote source";
    2. The system redeploys the repo "If the system detected changes after last pull".

UC2.1 where System(a system) redeploys using Repository(a repo):
    1. The system deletes Container(a containers) "terminates all Docker containers of the repo";
    2. The system creates Container(a newContainers).

I think we should avoid informals whenever possible, so I suggest to add some syntax extension to allow conditional branches inside use case definitions.

[davvd]

I'll find a developer for the task soon...

[davvd]

thanks for the report, I topped your acc for 15 mins, payment ID 40419698

[davvd]

@yegor256 please proceed, it's yours

[yegor256]

@davvd assign someone else pls

[davvd]

@davvd assign someone else pls

@yegor256 30 points deducted from your rating

[davvd]

@davvd assign someone else pls

@yegor256 I will ask somebody else to pick this up