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api: nvim_get_mode()

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Asynchronous API functions are served immediately, which means pending
input could change the state of Nvim shortly after an async API function
result is returned.

nvim_get_mode() is different:
  - If RPCs are known to be blocked, it responds immediately (without
    flushing the input/event queue)
  - else it is handled just-in-time before waiting for input, after
    pending input was processed. This makes the result more reliable
    (but not perfect).

Internally this is handled as a special case, but _semantically_ nothing
has changed: API users never know when input flushes, so this internal
special-case doesn't violate that. As far as API users are concerned,
nvim_get_mode() is just another asynchronous API function.

In all cases nvim_get_mode() never blocks for more than the time it
takes to flush the input/event queue (~µs).

Note: This doesn't address #6166; nvim_get_mode() will provoke #6166 if
e.g. `d` is operator-pending.

Closes #6159
This commit is contained in:
Justin M. Keyes
2017-03-13 15:02:37 +01:00
parent 7044aa6e82
commit 3ea1007753
16 changed files with 250 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
src/nvim/api/vim.c
View File

@@ -11,6 +11,7 @@
#include "nvim/api/vim.h"
#include "nvim/ascii.h"
#include "nvim/log.h"
#include "nvim/api/private/helpers.h"
#include "nvim/api/private/defs.h"
#include "nvim/api/buffer.h"
@@ -27,6 +28,7 @@
#include "nvim/eval.h"
#include "nvim/eval/typval.h"
#include "nvim/option.h"
#include "nvim/state.h"
#include "nvim/syntax.h"
#include "nvim/getchar.h"
#include "nvim/os/input.h"
@@ -701,6 +703,25 @@ Dictionary nvim_get_color_map(void)
}
/// Gets the current mode.
/// mode: Mode string. |mode()|
/// blocking: true if Nvim is waiting for input.
///
/// @returns Dictionary { "mode": String, "blocking": Boolean }
Dictionary nvim_get_mode(void)
FUNC_API_SINCE(2) FUNC_API_ASYNC
{
Dictionary rv = ARRAY_DICT_INIT;
char *modestr = get_mode();
bool blocked = input_blocking();
ILOG("blocked=%d", blocked);
PUT(rv, "mode", STRING_OBJ(cstr_as_string(modestr)));
PUT(rv, "blocking", BOOLEAN_OBJ(blocked));
return rv;
}
Array nvim_get_api_info(uint64_t channel_id)
FUNC_API_SINCE(1) FUNC_API_ASYNC FUNC_API_NOEVAL
{