feat(clipboard): support other clipboard command

bundle/vim-clipboard/autoload/clipboard.vim

@@ -7,16 +7,57 @@
 "=============================================================================
 
 " This script is based on kamilkrz (Kamil Krześ)'s idea about using clipboard.
+function! s:set_command() abort
+  let yank = ''
+  let paste = ''
+
+  " the logic is based on nvim's clipboard provider
+  
+  if has('mac')
+    let yank = ['pbcopy']
+    let paste = ['pbpaste']
+  elseif !empty($WAYLAND_DISPLAY) && executable('wl-copy') && executable('wl-paste')
+    let yank = ['wl-copy', '--foreground', '--type', 'text/plain']
+    let paste = ['wl-paste', '--no-newline']
+  elseif !empty($DISPLAY) && executable('xclip')
+    let yank = ['xclip', '-quiet', '-i', '-selection', 'clipboard']
+    let paste = ['xclip', '-o', '-selection', 'clipboard']
+  elseif !empty($DISPLAY) && executable('xsel')
+    let yank = ['xsel', '--nodetach', '-i', '-b']
+    let paste = ['xsel', '-o', '-b']
+  elseif executable('lemonade')
+    let yank = ['lemonade', 'copy']
+    let paste = ['lemonade', 'paste']
+  elseif executable('doitclient')
+    let yank = ['doitclient', 'wclip']
+    let paste = ['doitclient', 'wclip', '-r']
+  elseif executable('win32yank.exe')
+    if has('wsl') && getftype(exepath('win32yank.exe')) == 'link'
+      let win32yank = resolve(exepath('win32yank.exe'))
+    else
+      let win32yank = 'win32yank.exe'
+    endif
+    let yank = [win32yank, '-i', '--crlf']
+    let paste = [win32yank, '-o', '--lf']
+  elseif executable('termux-clipboard-set')
+    let yank = ['termux-clipboard-set']
+    let paste = ['termux-clipboard-get']
+  elseif !empty($TMUX) && executable('tmux')
+    let yank = ['tmux', 'load-buffer', '-']
+    let paste = ['tmux', 'save-buffer', '-']
+  endif
+  return [yank, paste]
+endfunction
 
 function! clipboard#yank() abort
-  call system('win32yank.exe -i --crlf', GetSelectedText())
+  call system(s:yank_cmd, GetSelectedText())
 endfunction
 
 
 " The mode can be `p` or `P`
 
 function! clipboard#paste(mode) abort
-  let @" = system('win32yank.exe -o --lf')
+  let @" = system(s:paste_cmd)
   return a:mode
 endfunction
 
@@ -26,3 +67,5 @@ function! GetSelectedText()
   let result = getreg("x")
   return result
 endfunction
+
+let [s:yank_cmd, s:paste_cmd] = s:set_command()