Replace osc52yank.vim with autoload script

autoload/osc52.vim

@@ -1,19 +1,12 @@
 " Use the OSC 52 escape sequence to copy text to the local system clipboard
 " when connected to a remote machine.
 
-function! osc52#init()
+" Add an autocmd to run after text is yanked.
+function! osc52#autocmd()
   augroup osc52
     autocmd!
-    " Add an autocmd to run after text is yanked.
     autocmd TextYankPost * call osc52#copy()
   augroup END
-  " When connected to a remote session the + selection register is not
-  " available and the unnamed register is used instead. Add normal and visual
-  " mode mappings using the z register instead.
-  nnoremap <leader>y "zy
-  nnoremap <leader>Y "zY
-  vnoremap <leader>y "zy
-  vnoremap <leader>Y "zY
 endfunction
 
 function! osc52#copy()

plugin/mappings.vim

@@ -95,8 +95,14 @@ nnoremap <leader>tm :tabmove<Space>
 " Clear search highlights
 nnoremap <leader><Space> :nohlsearch<CR>
 
-if exists('loaded_oscyank')
-  noremap <leader>y :Oscyank<CR>
+if tmux#isOption('set-clipboard', 'on') || $SSH_CONNECTION !=# ''
+  " When connected to a remote session the + selection register is not
+  " available and the unnamed register is used instead. Add mappings using the
+  " z register instead.
+  noremap <leader>y "zy
+  noremap <leader>Y "zY
+  " Enable OSC 52 copy on yank.
+  call osc52#autocmd()
 else
   " System clipboard yank/put
   noremap <leader>y "+y

vimrc

@@ -183,7 +183,3 @@ Pack 'mustache/vim-mustache-handlebars'
 Pack 'joshglendenning/vim-caddyfile'
 Pack 'kbenzie/vim-khr'
 Pack 'jrozner/vim-antlr'
-
-if tmux#isOption('set-clipboard', 'on')
-  call osc52#init()
-endif