Allow setting a policy about what context to choose when starting mu4e
and composing a message. Basically:
When you have defined contexts and you start mu4e it decides which
context to use based on the variable `mu4e-context-policy';
similarly, when you compose a new message, the context is determined
using `mu4e-compose-context-policy'.
These policies can be one of the following:
- a symbol always-ask: unconditionally ask the user what context to pick
The other choices only apply if none of the context matches (i.e., if
none of the contexts' match-functions returns t:
- symbol ask: ask the user
- a symbol pick-first: pick the first context
- nil: don't change the context
Update mu4e-context-switch to not call the enter/leave functions when
'changing' to the current context. However, calling those functions (if
defined) can be force through a prefix arg. Document this.
Make mu4e-context-determine recognize 'policies', i.e. what to do when
no context matches. This part is WIP.
When contexts have been defined, automatically select one at startup --
either the first whose match-function returns non-nil, or simply the
first one.
Document this, too.
Define mu4e-context - a structure with settings and enter/leave
functions for contexts, and some functions for switching between
contexts and auto-detecting them.