Collect Neovim Feature Flags

has.lua

-- :source this file to collect feature flag values and write to has_list.log

-- src/nvim/eval/funcs.c
local has_list = {
  "bsd",
  "linux",
  "sun",
  "unix",
  "win32",
  "win64",
  "fname_case",
  "acl",
  "autochdir",
  "arabic",
  "autocmd",
  "browsefilter",
  "byte_offset",
  "cindent",
  "cmdline_compl",
  "cmdline_hist",
  "cmdwin",
  "comments",
  "conceal",
  "cursorbind",
  "cursorshape",
  "dialog_con",
  "diff",
  "digraphs",
  "eval",
  "ex_extra",
  "extra_search",
  "file_in_path",
  "filterpipe",
  "find_in_path",
  "float",
  "folding",
  "fork",
  "gettext",
  "iconv",
  "insert_expand",
  "jumplist",
  "keymap",
  "lambda",
  "langmap",
  "libcall",
  "linebreak",
  "lispindent",
  "listcmds",
  "localmap",
  "mac",
  "macunix",
  "osx",
  "osxdarwin",
  "menu",
  "mksession",
  "modify_fname",
  "mouse",
  "multi_byte",
  "multi_lang",
  "nanotime",
  "num64",
  "packages",
  "path_extra",
  "persistent_undo",
  "profile",
  "pythonx",
  "reltime",
  "quickfix",
  "rightleft",
  "scrollbind",
  "showcmd",
  "cmdline_info",
  "shada",
  "signs",
  "smartindent",
  "startuptime",
  "statusline",
  "spell",
  "syntax",
  "system",
  "tablineat",
  "tag_binary",
  "termguicolors",
  "termresponse",
  "textobjects",
  "timers",
  "title",
  "user_commands",
  "vartabs",
  "vertsplit",
  "virtualedit",
  "visual",
  "visualextra",
  "vreplace",
  "wildignore",
  "wildmenu",
  "windows",
  "winaltkeys",
  "writebackup",
  "nvim",

  -- hardcoded
  "gui_running",
  "patch",
  "ttyin",
  "ttyout",
  "multi_byte_encoding",
  "syntax_items",
  "clipboard_working",
  "clipboard",
  "wsl",
  "vim_starting",
}

local log_name = "has_list.log"

local log_file = io.open(log_name, "w")
if not log_file then
  print("could not open " .. log_name)
  return
end
io.output(log_file)

for _, f in ipairs(has_list) do
  io.write(string.format("%s=%d\n", f, vim.fn.has(f)))
end

io.close(log_file)

print("wrote " .. log_name)