Global CLI flags

[neos-bot]

Jira issue originally created by user @bwaidelich:

It should be possible to define global flags that can be used for all commands

Jira-URL: https://jira.neos.io/browse/FLOW-216

[neos-bot]

Comment created by @bwaidelich:

Some ideas for global flags

help

Allows to append "--help" to any command to see it's description

verbose

A new method could be added AbstractCommandController::isVerbose() that returns TRUE if the flag is set

Considerations:

• do we need multiple verbosity levels (-v, -vv, -vvv)?
• What if a command expects a $verbose argument - I think it should be possible to pass that on anyways.. If it's not a boolean argument, an exception should be thrown
  ** Should we change the signature of the output**() methods to incorporate the verbosity flag? E.g.: protected function output($text, array $arguments = array(), $verbosityLevel = self::VERBOSITY_GENERAL)

context

Allows executing of commands in a different context, e.g. ./flow flow:cache:flush --context Production

Considerations:

• Should it be possible to specify multiple contexts (comma separated)?
  ** Currently it's not possible to determine all defined contexts (a context is implicitly created according to the FLOW_CONTEXT* env variable). An idea to circumvent this is, that a context is only valid if a corresponding directory exists in the global configuration folder, e.g. Configuration/Development/MyContext .This would allow us to fetch all registered (sub)contexts. Also it would make it easier to react to typos in the specified context.