feat: make it easier to completely override the default keymappings

There's still a bit of manual work involved, and I think in the future
it might be necessary to add some smarter way of overriding only some of
the keymappings. Not sure what the best way to do this would be.

Partial overrides could also be added.

lua/yazi/config.lua

@@ -22,37 +22,22 @@ function M.default()
   }
 end
 
+--- This sets the default keymappings for yazi. If you want to use your own
+--- keymappings, you can set the set_keymappings_function in your config. Copy
+--- this function as the basis.
 ---@param yazi_buffer integer
 ---@param config YaziConfig
 function M.default_set_keymappings_function(yazi_buffer, config)
   vim.keymap.set({ 't' }, '<c-v>', function()
-    config.open_file_function = openers.open_file_in_vertical_split
-    config.hooks.yazi_opened_multiple_files = function(chosen_files)
-      for _, chosen_file in ipairs(chosen_files) do
-        config.open_file_function(chosen_file, config)
-      end
-    end
-    M.select_current_file_and_close_yazi()
+    M.open_file_in_vertical_split(config)
   end, { buffer = yazi_buffer })
 
   vim.keymap.set({ 't' }, '<c-x>', function()
-    config.open_file_function = openers.open_file_in_horizontal_split
-    config.hooks.yazi_opened_multiple_files = function(chosen_files)
-      for _, chosen_file in ipairs(chosen_files) do
-        config.open_file_function(chosen_file, config)
-      end
-    end
-    M.select_current_file_and_close_yazi()
+    M.open_file_in_horizontal_split(config)
   end, { buffer = yazi_buffer })
 
   vim.keymap.set({ 't' }, '<c-t>', function()
-    config.open_file_function = openers.open_file_in_tab
-    config.hooks.yazi_opened_multiple_files = function(chosen_files)
-      for _, chosen_file in ipairs(chosen_files) do
-        config.open_file_function(chosen_file, config)
-      end
-    end
-    M.select_current_file_and_close_yazi()
+    M.open_file_in_tab(config)
   end, { buffer = yazi_buffer })
 end
 
@@ -68,4 +53,37 @@ function M.select_current_file_and_close_yazi()
   )
 end
 
+---@param config YaziConfig
+function M.open_file_in_vertical_split(config)
+  config.open_file_function = openers.open_file_in_vertical_split
+  config.hooks.yazi_opened_multiple_files = function(chosen_files)
+    for _, chosen_file in ipairs(chosen_files) do
+      config.open_file_function(chosen_file, config)
+    end
+  end
+  M.select_current_file_and_close_yazi()
+end
+
+---@param config YaziConfig
+function M.open_file_in_horizontal_split(config)
+  config.open_file_function = openers.open_file_in_horizontal_split
+  config.hooks.yazi_opened_multiple_files = function(chosen_files)
+    for _, chosen_file in ipairs(chosen_files) do
+      config.open_file_function(chosen_file, config)
+    end
+  end
+  M.select_current_file_and_close_yazi()
+end
+
+---@param config YaziConfig
+function M.open_file_in_tab(config)
+  config.open_file_function = openers.open_file_in_tab
+  config.hooks.yazi_opened_multiple_files = function(chosen_files)
+    for _, chosen_file in ipairs(chosen_files) do
+      config.open_file_function(chosen_file, config)
+    end
+  end
+  M.select_current_file_and_close_yazi()
+end
+
 return M