definition: better sub filename

lua/lspsaga/definition.lua

@@ -121,6 +121,10 @@ function def:create_win(bufnr, root_dir)
   if util.ismac and (vim.bo[bufnr].filetype == 'c' or vim.bo[bufnr].filetype == 'cpp') then
     fname = util.sub_mac_c_header(fname)
   end
+  if vim.bo[bufnr].filetype == 'rust' then
+    fname = util.sub_rust_toolchains(fname)
+  end
+
   if not self.list or vim.tbl_isempty(self.list) then
     local float_opt = {
       width = math.floor(api.nvim_win_get_width(0) * config.definition.width),

lua/lspsaga/util.lua

@@ -235,4 +235,12 @@ function M.get_bold_num()
   return num
 end
 
+function M.sub_rust_toolchains(fname)
+  local rustup_home = os.getenv('RUSTUP_HOME') or vim.fs.joinpath(vim.env.HOME, '.rustup')
+  local toolchains = vim.fs.joinpath(rustup_home, 'toolchains')
+  local parts = vim.split(fname, M.path_sep, { trimempty = true })
+  local count = #vim.split(toolchains, M.path_sep, { trimempty = true })
+  return vim.fs.joinpath(unpack(parts, count + 1))
+end
+
 return M