update lua API to 1-based indices; add renderer

lua/u/opkeymap.lua

@@ -1,24 +1,17 @@
 local Range = require 'u.range'
-local vim_repeat = require 'u.repeat'
 
----@type fun(range: Range): nil|(fun():any)
+--- @type fun(range: u.Range): nil|(fun():any)
 local __U__OpKeymapOpFunc_rhs = nil
 
 --- This is the global utility function used for operatorfunc
 --- in opkeymap
----@type nil|fun(range: Range): fun():any|nil
----@param ty 'line'|'char'|'block'
+--- @type nil|fun(range: u.Range): fun():any|nil
+--- @param ty 'line'|'char'|'block'
 -- selene: allow(unused_variable)
-function __U__OpKeymapOpFunc(ty)
+function _G.__U__OpKeymapOpFunc(ty)
   if __U__OpKeymapOpFunc_rhs ~= nil then
     local range = Range.from_op_func(ty)
-    local repeat_inject = __U__OpKeymapOpFunc_rhs(range)
-
-    vim_repeat.set(function()
-      vim.o.operatorfunc = 'v:lua.__U__OpKeymapOpFunc'
-      if repeat_inject ~= nil and type(repeat_inject) == 'function' then repeat_inject() end
-      vim_repeat.native_repeat()
-    end)
+    __U__OpKeymapOpFunc_rhs(range)
   end
 end
 
@@ -28,12 +21,17 @@ end
 ---    g@: tells vim to way for a motion, and then call operatorfunc.
 --- 2. The operatorfunc is set to a lua function that computes the range being operated over, that
 ---    then calls the original passed callback with said range.
----@param mode string|string[]
----@param lhs string
----@param rhs fun(range: Range): nil|(fun():any) This function may return another function, which is called whenever the operator is repeated
----@param opts? vim.keymap.set.Opts
+--- @param mode string|string[]
+--- @param lhs string
+--- @param rhs fun(range: u.Range): nil
+--- @diagnostic disable-next-line: undefined-doc-name
+--- @param opts? vim.keymap.set.Opts
 local function opkeymap(mode, lhs, rhs, opts)
   vim.keymap.set(mode, lhs, function()
+    -- We don't need to wrap the operation in a repeat, because expr mappings are
+    -- repeated seamlessly by Vim anyway. In addition, the u.repeat:`.` mapping will
+    -- set IS_REPEATING to true, so that callbacks can check if they should used cached
+    -- values.
     __U__OpKeymapOpFunc_rhs = rhs
     vim.o.operatorfunc = 'v:lua.__U__OpKeymapOpFunc'
     return 'g@'