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lua: add vim.schedule(cb)

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This executes Lua callback on main loop's event queue so that nvim API
is safe to call.
This commit is contained in:
Andrey Popp
2019-01-24 19:52:05 +03:00
committed by Björn Linse
parent 16ee24082f
commit 81e1dbca99
1 changed files with 39 additions and 0 deletions
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39
src/nvim/lua/executor.c
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@ -36,6 +36,12 @@ typedef struct {
String lua_err_str;
} LuaError;
/// We use this to store Lua callbacks
typedef struct {
// TODO: store more info for debugging, traceback?
int cb;
} nlua_ctx;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "lua/vim_module.generated.h"
# include "lua/executor.c.generated.h"
@ -108,6 +114,36 @@ static int nlua_stricmp(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
return 1;
}
static void nlua_schedule_cb(void **argv)
{
nlua_ctx *ctx = argv[0];
lua_State *const lstate = nlua_enter();
lua_rawgeti(lstate, LUA_REGISTRYINDEX, ctx->cb);
luaL_unref(lstate, LUA_REGISTRYINDEX, ctx->cb);
lua_pcall(lstate, 0, 0, 0);
free(ctx);
}
/// Schedule Lua callback on main loop's event queue
///
/// This is used to make sure nvim API is called at the right moment.
///
/// @param lstate Lua interpreter state.
/// @param[in] msg Message base, must contain one `%s`.
static int nlua_schedule(lua_State *const lstate)
FUNC_ATTR_NONNULL_ALL
{
// TODO: report error using nlua_error instead
luaL_checktype(lstate, 1, LUA_TFUNCTION);
nlua_ctx* ctx = (nlua_ctx*)malloc(sizeof(nlua_ctx));
lua_pushvalue(lstate, 1);
ctx->cb = luaL_ref(lstate, LUA_REGISTRYINDEX);
multiqueue_put(main_loop.events, nlua_schedule_cb, 1, ctx);
return 0;
}
/// Initialize lua interpreter state
///
/// Called by lua interpreter itself to initialize state.
@ -143,6 +179,9 @@ static int nlua_state_init(lua_State *const lstate) FUNC_ATTR_NONNULL_ALL
// stricmp
lua_pushcfunction(lstate, &nlua_stricmp);
lua_setfield(lstate, -2, "stricmp");
// schedule
lua_pushcfunction(lstate, &nlua_schedule);
lua_setfield(lstate, -2, "schedule");
lua_setglobal(lstate, "vim");
return 0;