From 3a5d17d9d062b6b63397384a8600a03d1626231a Mon Sep 17 00:00:00 2001
From: DevFortunato <57877156+MovieMaker93@users.noreply.github.com>
Date: Fri, 17 May 2024 05:08:28 +0200
Subject: [PATCH] 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>
(cherry picked from commit 96610122a40f0bb4ce2e452c6d2429bf093d6700)
---
 lua/telescope/builtin/__internal.lua | 81 +++++++++++++++-------------
 1 file changed, 44 insertions(+), 37 deletions(-)

diff --git a/lua/telescope/builtin/__internal.lua b/lua/telescope/builtin/__internal.lua
index c209a65..9592b38 100644
--- a/lua/telescope/builtin/__internal.lua
+++ b/lua/telescope/builtin/__internal.lua
@@ -974,43 +974,20 @@ 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
-            del_win(status.preview_win)
-            del_win(status.preview_border_win)
-          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, {
@@ -1032,9 +1009,39 @@ 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