Feature: add set end pair length

It help to determine the length of end_pair string when it have a special
key like <left> <right> and it can help to move cursor to a middle
of end pair

lua/nvim-autopairs.lua

@@ -295,7 +295,8 @@ M.autopairs_map = function(bufnr, char)
                 and rule:can_pair(cond_opt)
             then
                 local end_pair = rule:get_end_pair(cond_opt)
-                local move_text = utils.repeat_key(utils.key.join_left,#end_pair)
+                local end_pair_length = rule:get_end_pair_length(end_pair)
+                local move_text = utils.repeat_key(utils.key.join_left, end_pair_length)
                 if add_char == 0 then
                     move_text =""
                     char = ""
@@ -352,7 +353,7 @@ M.autopairs_insert = function(bufnr, char)
                 local end_pair = rule:get_end_pair(cond_opt)
                 utils.set_vchar(char .. end_pair)
                 vim.schedule(function()
-                    utils.feed(utils.key.left, #end_pair)
+                    utils.feed(utils.key.left, rule:get_end_pair_length(end_pair))
                 end)
                 return
             end

lua/nvim-autopairs/rule.lua

@@ -32,7 +32,10 @@ function Rule.new(...)
         -- only use on end_wise
         is_endwise    = false,
         -- use regex to compare
-        is_regex      = false
+        is_regex      = false,
+        -- some end_pair have key map like <left>.. then the length of string is
+        -- not correct
+        end_pair_length = nil,
     },opt)
     return setmetatable(opt, {__index = Rule})
 end
@@ -52,7 +55,17 @@ function Rule:get_end_pair(opts)
     if self.end_pair_func then
         return self.end_pair_func(opts)
     end
-    return  self.end_pair
+    return self.end_pair
+end
+
+function Rule:get_end_pair_length(opts)
+    if self.end_pair_length then
+        return self.end_pair_length
+    end
+    if type(opts) == 'string' then
+        return #opts
+    end
+    return self.get_end_pair(opts):length()
 end
 
 function Rule:replace_endpair(value,check_pair)
@@ -67,6 +80,11 @@ function Rule:replace_endpair(value,check_pair)
     return self
 end
 
+function Rule:set_end_pair_length(length)
+    self.end_pair_length = length
+    return self
+end
+
 function Rule:with_move(cond)
     if self.move_cond == nil then self.move_cond = {}end
     table.insert(self.move_cond, cond)

tests/nvim-autopairs_spec.lua

@@ -390,14 +390,20 @@ local data = {
     },
     {
         setup_func = function()
-            npairs.add_rule(Rule("!", "!"):with_pair(cond.not_filetypes({"lua"})))
+            npairs.clear_rules()
+            npairs.add_rules({
+                Rule("%(.*%)%s*%=>", " {  }", {"typescript", "typescriptreact","javascript"})
+                :use_regex(true)
+                :set_end_pair_length(2)
+            })
         end,
-        name="enable pairs in html",
-        filetype="html",
-        key="!",
-        before = [[x| ]],
-        after  = [[x!|! ]]
-    },
+        name="mapping regex with custom end_pair_length",
+        filetype="typescript",
+        key=">",
+        before = [[(o)=| ]],
+        after  = [[(o)=> { | } ]]
+
+    }
 }
 
 local run_data = {}
@@ -436,6 +442,7 @@ local function Test(test_data)
             if value.key ~= '<cr>' then
                 eq(after, result , "\n\n text error: " .. value.name .. "\n")
                 eq(p_after, pos[3] + 1, "\n\n pos error: " .. value.name .. "\n")
+
             else
                 local line2 = vim.fn.getline(line + 2)
                 eq(line + 1, pos[2], '\n\n breakline error:' .. value.name .. "\n")