feat: cycle prompt history (#521)

history is enabled on default but cycle_history_next and cycle_history_prev is not mapped yet

Example:
require('telescope').setup {
  defaults = {
    mappings = {
      i = {
        ["<C-Down>"] = require('telescope.actions').cycle_history_next,
        ["<C-Up>"] = require('telescope.actions').cycle_history_prev,
      }
    }
  }
}

For more information :help telescope.defaults.history

big thanks to clason and all other testers :)

lua/telescope/actions/mt.lua

@@ -19,6 +19,9 @@ action_mt.create = function(mod)
     __call = function(t, ...)
       local values = {}
       for _, action_name in ipairs(t) do
+        if t._static_pre[action_name] then
+          t._static_pre[action_name](...)
+        end
         if t._pre[action_name] then
           t._pre[action_name](...)
         end
@@ -34,6 +37,9 @@ action_mt.create = function(mod)
           table.insert(values, res)
         end
 
+        if t._static_post[action_name] then
+          t._static_post[action_name](...)
+        end
         if t._post[action_name] then
           t._post[action_name](...)
         end
@@ -55,8 +61,10 @@ action_mt.create = function(mod)
       return setmetatable(new_actions, getmetatable(lhs))
     end,
 
+    _static_pre = {},
     _pre = {},
     _replacements = {},
+    _static_post = {},
     _post = {},
   }
 
@@ -119,8 +127,14 @@ action_mt.create = function(mod)
   return mt
 end
 
-action_mt.transform = function(k, mt)
-  return setmetatable({k}, mt)
+action_mt.transform = function(k, mt, mod, v)
+  local res = setmetatable({k}, mt)
+  if type(v) == "table" then
+    res._static_pre[k] = v.pre
+    res._static_post[k] = v.post
+    mod[k] = v.action
+  end
+  return res
 end
 
 action_mt.transform_mod = function(mod)
@@ -130,8 +144,8 @@ action_mt.transform_mod = function(mod)
   --    This allows for custom errors, lookups, etc.
   local redirect = setmetatable({}, getmetatable(mod) or {})
 
-  for k, _ in pairs(mod) do
-    redirect[k] = action_mt.transform(k, mt)
+  for k, v in pairs(mod) do
+    redirect[k] = action_mt.transform(k, mt, mod, v)
   end
 
   redirect._clear = mt.clear