feat: add git_stash picker (#800)

lua/telescope/previewers/buffer_previewer.lua

@@ -502,6 +502,23 @@ previewers.git_branch_log = defaulter(function(opts)
   }
 end, {})
 
+previewers.git_stash_diff = defaulter(function(opts)
+  return previewers.new_buffer_previewer {
+    get_buffer_by_name = function(_, entry)
+      return entry.value
+    end,
+
+    define_preview = function(self, entry, _)
+      putils.job_maker({ 'git', '--no-pager', 'stash', 'show', '-p',  entry.value }, self.state.bufnr, {
+        value = entry.value,
+        bufname = self.state.bufname,
+        cwd = opts.cwd
+      })
+      putils.regex_highlighter(self.state.bufnr, 'diff')
+    end
+  }
+end, {})
+
 previewers.git_commit_diff = defaulter(function(opts)
   return previewers.new_buffer_previewer {
     get_buffer_by_name = function(_, entry)

lua/telescope/previewers/init.lua

@@ -263,6 +263,7 @@ previewers.vim_buffer_qflist = buffer_previewer.qflist
 previewers.git_branch_log = buffer_previewer.git_branch_log
 previewers.git_commit_diff = buffer_previewer.git_commit_diff
 previewers.git_file_diff = buffer_previewer.git_file_diff
+previewers.git_stash_diff = buffer_previewer.git_stash_diff
 
 
 previewers.ctags = buffer_previewer.ctags