Another way in which the commit d768447 forced the client to wait for
the server to start was the UpdateDiagnosticNotifications call from the
FileReadyToParse which is called right after a buffer is loaded. In any
way if we don't have any previous FileReadyToParse request done for the
current file we bail out, so we we can wait for a FileReadyToParse
response to be available before asking if a completer is usable for the
current filetype.
ref: #1529
When we enter a new buffer we need to know if the ycmd server has a
native completer for the current filetype, this means that when we start
vim we need to know if the server has a completer available for the
buffer which means that we have to wait for the server to be up and
running. To mitigate this defer the setting of the omnifunction closer
to its need which is when we enter insert mode; this should give room
for the ycmd server to start before we ask for anything or at least
should reduce the time waiting.
ref: #1529
Previously we were checking if the `hook.py` file existed for the given
filetype. ycmd has an endpoint for checking if given a filetype a
semantic completer is available. To avoid redundant requests we cache
those requests for every filetype. A semantic engine cannot be added
*after* the ycmd server is started so to avoid redundant requests we
cache those requests for every filetype and we clear the cache at server
setup, in this way if we issue a `YcmRestartServer` command the server
will be setup again and if a semantic completer is available we can use
it. Should fix#1284.
No need to mention semantic engine submodule conf because correct
submodule checkout is mandatory (and has been for years) for YCM to work
correctly. Not to mention that ycmd is what has the Jedi/OmniSharp
submodules now, not YCM itself.
This is required to allow the ycmd GetType and GetParent subcommands to echo
their reults in vim. The apporach is to display any text returned from a
subcommand in the 'message' property assuming that the command is not a known
'GoTo' command.
