api: allow open non-current buffer as terminal (+ xmas bonus)

vim.api.nvim_chan_send(vim.api.nvim_open_term(0), io.open("/path/to/smile.cat", "r"):read("*a"))

src/nvim/generators/gen_eval.lua

@@ -25,7 +25,7 @@ local gperfpipe = io.open(funcsfname .. '.gperf', 'wb')
 local funcs = require('eval').funcs
 local metadata = mpack.unpack(io.open(metadata_file, 'rb'):read("*all"))
 for _,fun in ipairs(metadata) do
-  if not (fun.remote_only or fun.lua_only) then
+  if fun.eval then
     funcs[fun.name] = {
       args=#fun.parameters,
       func='api_wrapper',