tags|btags: properly handle all special characters (closes #371)

lua/fzf-lua/make_entry.lua

@@ -332,7 +332,13 @@ M.tag = function(opts, x)
   local name, file, text = x:match("([^\t]+)\t([^\t]+)\t(.*)")
   if not file or not name or not text then return x end
   text = text:match('(.*);"') or text   -- remove ctag comments
-  local line, tag = text:gsub("\\/", "/"):match("(%d-);?(/.*/)")
+  -- unescape ctags special chars
+  -- '\/' -> '/'
+  -- '\\' -> '\'
+  for _, s in ipairs({ '/',  '\\' }) do
+    text = text:gsub([[\]]..s, s)
+  end
+  local line, tag = text:match("(%d-);?(/.*/)")
   line = line and #line>0 and tonumber(line)
   return ("%s%s: %s %s"):format(
     M.file(opts, file),

lua/fzf-lua/path.lua

@@ -140,18 +140,20 @@ end
 
 
 function M.entry_to_ctag(entry, noesc)
-  local scode = entry:match("%:.-/^?\t?(.*)/")
+  local ctag = entry:match("%:.-/^?\t?(.*)/")
   -- if tag name contains a slash we could
   -- have the wrong match, most tags start
   -- with ^ so try to match based on that
-  scode = scode and scode:match("/^(.*)") or scode
-  if scode and not noesc then
-    -- scode = string.gsub(scode, "[$]$", "")
-    scode = string.gsub(scode, [[\\]], [[\]])
-    scode = string.gsub(scode, [[\/]], [[/]])
-    scode = string.gsub(scode, "[*]", [[\*]])
+  ctag = ctag and ctag:match("/^(.*)") or ctag
+  if ctag and not noesc then
+    -- required escapes for vim.fn.search()
+    -- \ ] ~ *
+    ctag = ctag:gsub('[\\%]~*]',
+      function(x)
+        return '\\' .. x
+      end)
   end
-  return scode
+  return ctag
 end
 
 function M.entry_to_location(entry)