vim-patch:9.1.0547: No way to get the arity of a Vim function (#29638)

Problem:  No way to get the arity of a Vim function
          (Austin Ziegler)
Solution: Enhance get() Vim script function to return the function
          argument info using get(func, "arity") (LemonBoy)

fixes: vim/vim#15097
closes: vim/vim#15109

https://github.com/vim/vim/commit/48b7d05a4f88c4326bd5d7a73a523f2d953b3e51

Co-authored-by: LemonBoy <thatlemon@gmail.com>

1 files changed, 9 insertions, 7 deletions

diff --git a/scripts/gen_eval_files.lua b/scripts/gen_eval_files.lua
index 76092f8b39..b490e7b480 100755
--- a/scripts/gen_eval_files.lua
+++ b/scripts/gen_eval_files.lua
@@ -432,14 +432,15 @@ local function render_eval_meta(f, fun, write)
 end
 
 --- @param name string
+--- @param name_tag boolean
 --- @param fun vim.EvalFn
 --- @param write fun(line: string)
-local function render_sig_and_tag(name, fun, write)
+local function render_sig_and_tag(name, name_tag, fun, write)
   if not fun.signature then
     return
   end
 
-  local tags = { '*' .. name .. '()*' }
+  local tags = name_tag and { '*' .. name .. '()*' } or {}
 
   if fun.tags then
     for _, t in ipairs(fun.tags) do
@@ -447,6 +448,11 @@ local function render_sig_and_tag(name, fun, write)
     end
   end
 
+  if #tags == 0 then
+    write(fun.signature)
+    return
+  end
+
   local tag = table.concat(tags, ' ')
   local siglen = #fun.signature
   local conceal_offset = 2 * (#tags - 1)
@@ -472,11 +478,7 @@ local function render_eval_doc(f, fun, write)
     return
   end
 
-  if f:find('__%d+$') then
-    write(fun.signature)
-  else
-    render_sig_and_tag(fun.name or f, fun, write)
-  end
+  render_sig_and_tag(fun.name or f, not f:find('__%d+$'), fun, write)
 
   if not fun.desc then
     return