Refactor previewers (#345)

lua/telescope/previewers/init.lua

@@ -0,0 +1,33 @@
+local Previewer = require('telescope.previewers.previewer')
+local term_previewer = require('telescope.previewers.term_previewer')
+local buffer_previewer = require('telescope.previewers.buffer_previewer')
+
+local previewers = {}
+
+previewers.new = function(...)
+  return Previewer:new(...)
+end
+
+previewers.new_termopen_previewer = term_previewer.new_termopen_previewer
+previewers.git_commit_diff        = term_previewer.git_commit_diff
+previewers.git_branch_log         = term_previewer.git_branch_log
+previewers.git_file_diff          = term_previewer.git_file_diff
+previewers.cat                    = term_previewer.cat
+previewers.vimgrep                = term_previewer.vimgrep
+previewers.qflist                 = term_previewer.qflist
+
+previewers.new_buffer_previewer = buffer_previewer.new_buffer_previewer
+previewers.vim_buffer_cat       = buffer_previewer.cat
+previewers.vim_buffer_vimgrep   = buffer_previewer.vimgrep
+previewers.vim_buffer_qflist    = buffer_previewer.qflist
+previewers.ctags                = buffer_previewer.ctags
+previewers.builtin              = buffer_previewer.builtin
+previewers.help                 = buffer_previewer.help
+previewers.man                  = buffer_previewer.man
+previewers.autocommands         = buffer_previewer.autocommands
+previewers.highlights           = buffer_previewer.highlights
+previewers.display_content      = buffer_previewer.display_content
+
+previewers.Previewer = Previewer
+
+return previewers