feat: copy/paste to system clipboard (#559)

* feat: copy/paste to system clipboard on macOS

* stylua

* feat: copy/paste to system clipboard on linux

* force mime type

* fix string.gsub

* vim.uv or vim.loop

* fix stylua

* support gnome directly

* support wayland

* refactor: extract clipboard actions into separate file

* fix: copy/paste in KDE

* refactor: simplify file loading

* fix: copy/paste on x11

* fix: better error message when clipboard command not found

* fix: paste on mac

* fix: pasting in Gnome

* feat: support pasting multiple files

* feat: support copying multiple files to clipboard

---------

Co-authored-by: Steve Walker <65963536+etherswangel@users.noreply.github.com>
Co-authored-by: Steven Arcangeli <stevearc@stevearc.com>

lua/oil/init.lua

@@ -30,8 +30,6 @@ local M = {}
 ---@field filter_action? fun(action: oil.Action): boolean When present, filter out actions as they are created
 ---@field filter_error? fun(action: oil.ParseError): boolean When present, filter out errors from parsing a buffer
 
-local load_oil_buffer
-
 ---Get the entry on a specific line (1-indexed)
 ---@param bufnr integer
 ---@param lnum integer
@@ -593,7 +591,7 @@ M.open_preview = function(opts, callback)
     -- If we called open_preview during an autocmd, then the edit command may not trigger the
     -- BufReadCmd to load the buffer. So we need to do it manually.
     if util.is_oil_bufnr(filebufnr) then
-      load_oil_buffer(filebufnr)
+      M.load_oil_buffer(filebufnr)
     end
 
     vim.api.nvim_set_option_value("previewwindow", true, { scope = "local", win = 0 })
@@ -1013,8 +1011,9 @@ local function restore_alt_buf()
   end
 end
 
+---@private
 ---@param bufnr integer
-load_oil_buffer = function(bufnr)
+M.load_oil_buffer = function(bufnr)
   local config = require("oil.config")
   local keymap_util = require("oil.keymap_util")
   local loading = require("oil.loading")
@@ -1218,7 +1217,7 @@ M.setup = function(opts)
     pattern = scheme_pattern,
     nested = true,
     callback = function(params)
-      load_oil_buffer(params.buf)
+      M.load_oil_buffer(params.buf)
     end,
   })
   vim.api.nvim_create_autocmd("BufWriteCmd", {
@@ -1388,7 +1387,7 @@ M.setup = function(opts)
       local util = require("oil.util")
       local scheme = util.parse_url(params.file)
       if config.adapters[scheme] and vim.api.nvim_buf_line_count(params.buf) == 1 then
-        load_oil_buffer(params.buf)
+        M.load_oil_buffer(params.buf)
       end
     end,
   })
@@ -1397,7 +1396,7 @@ M.setup = function(opts)
   if maybe_hijack_directory_buffer(bufnr) and vim.v.vim_did_enter == 1 then
     -- manually call load on a hijacked directory buffer if vim has already entered
     -- (the BufReadCmd will not trigger)
-    load_oil_buffer(bufnr)
+    M.load_oil_buffer(bufnr)
   end
 end