grep: better regex handling of . and %

lua/fzf-lua/make_entry.lua

@@ -235,6 +235,8 @@ M.preprocess = function(opts)
         glob_args = glob_args .. ("%s %s ")
           :format(opts.glob_flag, vim.fn.shellescape(s))
       end
+      -- gsub doesn't like single % on rhs
+      search_query = search_query:gsub("%%", "%%%%")
       -- reset argvz so it doesn't get replaced again below
       opts.cmd = opts.cmd:gsub(argvz,
         glob_args .. vim.fn.shellescape(search_query))

lua/fzf-lua/providers/grep.lua

@@ -267,7 +267,7 @@ M.live_grep_mt = function(opts)
     opts.fzf_fn = {}
     if opts.exec_empty_query or (opts.search and #opts.search > 0) then
       opts.fzf_fn = initial_command:gsub(placeholder,
-        libuv.shellescape(query))
+        libuv.shellescape(query:gsub("%%", "%%%%")))
     end
     opts.fzf_opts['--phony'] = ''
     opts.fzf_opts['--query'] = libuv.shellescape(query)

lua/fzf-lua/utils.lua

@@ -103,8 +103,8 @@ end
 function M.rg_escape(str)
   if not str then return str end
   --  [(~'"\/$?'`*&&||;[]<>)]
-  --  escape "\~$?*|[()-^"
-  return str:gsub('[\\~$?*|{\\[()%-^]', function(x)
+  --  escape "\~$?*|[()^-."
+  return str:gsub('[\\~$?*|{\\[()^%-%.]', function(x)
     return '\\' .. x
   end)
 end