fix(builtin.colorscheme): preview colorscheme without previewer (#3097)

* fix: enable_preview true

* fix: remove buflisted check and colorscheme command in the buffer previewer

---------

Co-authored-by: nobrain <moviemaker@alfonso>

lua/telescope/builtin/__internal.lua

@@ -999,45 +999,20 @@ internal.colorscheme = function(opts)
  local bufnr = vim.api.nvim_get_current_buf()
  local p = vim.api.nvim_buf_get_name(bufnr)
 
- -- don't need previewer
- if vim.fn.buflisted(bufnr) ~= 1 then
- local deleted = false
- local function del_win(win_id)
- if win_id and vim.api.nvim_win_is_valid(win_id) then
- utils.buf_delete(vim.api.nvim_win_get_buf(win_id))
- pcall(vim.api.nvim_win_close, win_id, true)
+ -- show current buffer content in previewer
+ previewer = previewers.new_buffer_previewer {
+ get_buffer_by_name = function()
+ return p
+ end,
+ define_preview = function(self)
+ if vim.loop.fs_stat(p) then
+ conf.buffer_previewer_maker(p, self.state.bufnr, { bufname = self.state.bufname })
+ else
+ local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
+ vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, lines)
  end
- end
-
- previewer = previewers.new {
- preview_fn = function(_, entry, status)
- if not deleted then
- deleted = true
- if status.layout.preview then
- del_win(status.layout.preview.winid)
- del_win(status.layout.preview.border.winid)
- end
- end
- vim.cmd.colorscheme(entry.value)
- end,
- }
- else
- -- show current buffer content in previewer
- previewer = previewers.new_buffer_previewer {
- get_buffer_by_name = function()
- return p
- end,
- define_preview = function(self, entry)
- if vim.loop.fs_stat(p) then
- conf.buffer_previewer_maker(p, self.state.bufnr, { bufname = self.state.bufname })
- else
- local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
- vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, lines)
- end
- vim.cmd.colorscheme(entry.value)
- end,
- }
- end
+ end,
+ }
  end
 
  local picker = pickers.new(opts, {
@@ -1059,9 +1034,39 @@ internal.colorscheme = function(opts)
  need_restore = false
  vim.cmd.colorscheme(selection.value)
  end)
-
+ action_set.shift_selection:enhance {
+ post = function()
+ local selection = action_state.get_selected_entry()
+ if selection == nil then
+ utils.__warn_no_selection "builtin.colorscheme"
+ return
+ end
+ need_restore = true
+ if opts.enable_preview then
+ vim.cmd.colorscheme(selection.value)
+ end
+ end,
+ }
+ actions.close:enhance {
+ post = function()
+ if need_restore then
+ vim.cmd.colorscheme(before_color)
+ end
+ end,
+ }
  return true
  end,
+ on_complete = {
+ function()
+ local selection = action_state.get_selected_entry()
+ if selection == nil then
+ utils.__warn_no_selection "builtin.colorscheme"
+ return
+ end
+ need_restore = true
+ vim.cmd.colorscheme(selection.value)
+ end,
+ },
  })
 
  if opts.enable_preview then