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feat(eval): exists() function supports checking v:lua functions (#26485)
Problem: Vimscript function exists() can't check v:lua functions. Solution: Add support for v:lua functions to exists().
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@ -339,6 +339,8 @@ The following changes to existing APIs or features add new behavior.
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• |vim.wait()| is no longer allowed to be called in |api-fast|.
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• Vimscript function |exists()| supports checking |v:lua| functions.
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==============================================================================
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REMOVED FEATURES *news-removed*
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@ -1716,6 +1716,8 @@ static void f_exists(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
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} else {
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n = au_exists(p + 1);
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}
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} else if (strncmp(p, "v:lua.", 6) == 0 && nlua_func_exists(p + 6)) {
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n = true;
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} else { // Internal variable.
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n = var_exists(p);
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}
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@ -2313,3 +2313,21 @@ void nlua_init_defaults(void)
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os_errmsg("\n");
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}
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}
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/// check lua function exist
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bool nlua_func_exists(const char *lua_funcname)
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{
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MAXSIZE_TEMP_ARRAY(args, 1);
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size_t length = strlen(lua_funcname) + 8;
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char *str = xmalloc(length);
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vim_snprintf(str, length, "return %s", lua_funcname);
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ADD_C(args, CSTR_AS_OBJ(str));
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Error err = ERROR_INIT;
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Object result = NLUA_EXEC_STATIC("return type(loadstring(...)()) =='function'", args, &err);
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xfree(str);
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if (result.type != kObjectTypeBoolean) {
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return false;
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}
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return result.data.boolean;
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}
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@ -3352,4 +3352,31 @@ describe('vim.keymap', function()
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eq(1, exec_lua[[return GlobalCount]])
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end)
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it('exists() can check a lua function', function()
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eq(true, exec_lua[[
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_G.test = function() print("hello") end
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return vim.fn.exists('v:lua.test') == 1
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]])
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eq(true, exec_lua[[
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return vim.fn.exists('v:lua.require("mpack").decode') == 1
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]])
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eq(true, exec_lua[[
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return vim.fn.exists("v:lua.require('vim.lsp').start") == 1
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]])
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eq(true, exec_lua[[
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return vim.fn.exists('v:lua.require"vim.lsp".start') == 1
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]])
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eq(true, exec_lua[[
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return vim.fn.exists("v:lua.require'vim.lsp'.start") == 1
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]])
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eq(false, exec_lua[[
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return vim.fn.exists("v:lua.require'vim.lsp'.unknown") == 1
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]])
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end)
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end)
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