signatures: show all overloads (#774)

* signatures: show all overloads

* dont show duplicates

* Update lua/blink/cmp/signature/window.lua

Co-authored-by: Liam Dyer <liamcdyer@gmail.com>

* simplify

---------

Co-authored-by: Liam Dyer <liamcdyer@gmail.com>

lua/blink/cmp/lib/window/docs.lua

@@ -4,7 +4,7 @@ local docs = {}
 
 --- @class blink.cmp.RenderDetailAndDocumentationOpts
 --- @field bufnr number
---- @field detail? string
+--- @field detail? string|string[]
 --- @field documentation? lsp.MarkupContent | string
 --- @field max_width number
 --- @field use_treesitter_highlighting boolean?
@@ -19,7 +19,13 @@ local docs = {}
 --- @param opts blink.cmp.RenderDetailAndDocumentationOpts
 function docs.render_detail_and_documentation(opts)
   local detail_lines = {}
-  if opts.detail and opts.detail ~= '' then detail_lines = docs.split_lines(opts.detail) end
+
+  local details = type(opts.detail) == 'string' and { opts.detail } or opts.detail
+  details = require('blink.cmp.lib.utils').deduplicate(details)
+
+  for _, v in ipairs(details) do
+    vim.list_extend(detail_lines, docs.split_lines(v))
+  end
 
   local doc_lines = {}
   if opts.documentation ~= nil then

lua/blink/cmp/signature/window.lua

@@ -52,10 +52,12 @@ function signature.open_with_signature_help(context, signature_help)
 
   local active_signature = signature_help.signatures[(signature_help.activeSignature or 0) + 1]
 
+  local labels = vim.tbl_map(function(signature) return signature.label end, signature_help.signatures)
+
   if signature.shown_signature ~= active_signature then
     require('blink.cmp.lib.window.docs').render_detail_and_documentation({
       bufnr = signature.win:get_buf(),
-      detail = active_signature.label,
+      detail = labels,
       documentation = active_signature.documentation,
       max_width = config.max_width,
       use_treesitter_highlighting = config.treesitter_highlighting,