refactor: add cache logic

lua/Trans/core/frontend.lua

@@ -1,17 +1,40 @@
 local Trans = require('Trans')
-local M = Trans.metatable('frontend')
+local conf = Trans.conf
+local frontend_opts = conf.frontend
 
 
--- local default_opts = vim.deepcopy(Trans.conf.frontend)
--- for name, private_opts in pairs(result or {}) do
---     local opts = vim.tbl_extend('keep', Trans.conf.backend[name] or {}, default_opts, private_opts)
+local function set_frontend_keymap(frontend)
+    local set = vim.keymap.set
+    local keymap_opts = { silent = true, expr = true }
+
+    for action, key in pairs(frontend.opts.keymap) do
+        set('n', key, function()
+            local instance = frontend.get_active_instance()
+            if instance then
+                instance:execute(action)
+            else
+                return key
+            end
+        end, keymap_opts)
+    end
+end
+
+
+local M = setmetatable({}, {
+    __index = function(self, name)
+        local opts = vim.tbl_extend('keep', frontend_opts[name] or {}, frontend_opts.default)
+        local frontend = require('Trans.frontend.' .. name)
+
+
+        frontend.opts = opts
+        self[name] = frontend
+
+        set_frontend_keymap(frontend)
+
+        return frontend
+    end
+})
+
 
---     local backend = M[name]
---     for k, v in pairs(opts) do
---         if not backend[k] then
---             backend[k] = v
---         end
---     end
--- end
 
 return M