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feat(options): lua closure/function options

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Problem:
Cannot assign Lua functions/closures to "func" ('completefunc',
'tagfun', …) or "expr" ('foldexpr', 'indentexpr', …) options.

Solution:
- Store "func"/"expr" options as `Callback` instead of string.
- Delete oceans of copy-pasted code.
- BREAKING: LuaRef returned via RPC/Vimscript is now represented as
  `"<Lua N: file:line>"` (like what `:map` shows) instead of `nil`.
- Note: `man.vim` still uses `v:lua` string, bc it's a vimscript ftplugin.

Helped-by: Lewis Russell <lewis6991@gmail.com>
This commit is contained in:
Justin M. Keyes
2026-07-29 19:09:48 +02:00
parent 917232b508
commit 726d1a92d2
55 changed files with 778 additions and 572 deletions
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21
src/nvim/buffer.c
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@@ -2170,11 +2170,11 @@ void free_buf_options(buf_T *buf, bool free_p_ff)
}
clear_string_option(&buf->b_p_def);
clear_string_option(&buf->b_p_inc);
clear_string_option(&buf->b_p_inex);
clear_string_option(&buf->b_p_inde);
callback_free(&buf->b_p_inex);
callback_free(&buf->b_p_inde);
clear_string_option(&buf->b_p_indk);
clear_string_option(&buf->b_p_fp);
clear_string_option(&buf->b_p_fex);
callback_free(&buf->b_p_fex);
clear_string_option(&buf->b_p_kp);
clear_string_option(&buf->b_p_mps);
clear_string_option(&buf->b_p_fo);
@@ -2208,12 +2208,9 @@ void free_buf_options(buf_T *buf, bool free_p_ff)
clear_string_option(&buf->b_p_cinw);
clear_string_option(&buf->b_p_cot);
clear_string_option(&buf->b_p_cpt);
clear_string_option(&buf->b_p_cfu);
callback_free(&buf->b_cfu_cb);
clear_string_option(&buf->b_p_ofu);
callback_free(&buf->b_ofu_cb);
clear_string_option(&buf->b_p_tsrfu);
callback_free(&buf->b_tsrfu_cb);
callback_free(&buf->b_p_cfu);
callback_free(&buf->b_p_ofu);
callback_free(&buf->b_p_tsrfu);
clear_cpt_callbacks(&buf->b_p_cpt_cb, buf->b_p_cpt_count);
buf->b_p_cpt_count = 0;
clear_string_option(&buf->b_p_gefm);
@@ -2224,10 +2221,8 @@ void free_buf_options(buf_T *buf, bool free_p_ff)
clear_string_option(&buf->b_p_path);
clear_string_option(&buf->b_p_tags);
clear_string_option(&buf->b_p_tc);
clear_string_option(&buf->b_p_tfu);
callback_free(&buf->b_tfu_cb);
clear_string_option(&buf->b_p_ffu);
callback_free(&buf->b_ffu_cb);
callback_free(&buf->b_p_tfu);
callback_free(&buf->b_p_ffu);
clear_string_option(&buf->b_p_dict);
clear_string_option(&buf->b_p_dia);
clear_string_option(&buf->b_p_tsr);