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Move files from src/ to src/nvim/.
- src/nvim/ becomes the new root dir for nvim executable sources.
- src/libnvim/ is planned to become root dir of the neovim library.
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- Add a job control module for spawning and controlling co-processes
- Add three vimscript functions for interfacing with the module
- Use dedicated header files for typedefs/structs in event/job modules
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- Add a new macro to klist.h: kl_empty()
The whole point of abstract data structures is to avoid reimplementing
common actions. The emptiness test seems to be such an action.
- Add a new function attribute to func_attr.h: FUNC_ATTR_UNUSED
Some of the many functions created by the macros in klist.h may end up not
being used. Unused functions cause compilation errors as we compile with
-Werror. To mark those functions as possibly unused we can use the
FUNC_ATTR_UNUSED now.
- Pass `Event` by value
`Event` is such a small struct that I don't think we should allocate heap space
and pass it by reference. Let's use the stack and memory cache in our favor
passing it by value.
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This removes all signal handling code from os_unix.c to os/signal.c. Now signal
handling is done like this:
- Watchers for signals are registered with libuv default event loop
- `event_poll` continuously calls `poll_uv_loop` to produce events until it
receives user input, SIGINT or a timeout
- Any signals received in `poll_uv_loop` will push events to a queue that is
drained and processed by `event_poll`
Signals aren't handled directly in the libuv callback to avoid recursion in the
event loop(which isn't supported by libuv).
The same principle will apply to other events in the future: Push to a queue
from a libuv callback and drain it from `event_poll`
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