feat: Add livegrep and lsp referecnes

lua/telescope/builtin.lua

@@ -4,29 +4,37 @@ A collection of builtin pipelines for telesceope.
 Meant for both example and for easy startup.
 --]]
 
+local finders = require('telescope.finders')
+local previewers = require('telescope.previewers')
+local pickers = require('telescope.pickers')
+local sorters = require('telescope.sorters')
+
 local builtin = {}
 
-builtin.git_files = function(_)
+builtin.git_files = function()
   -- TODO: Auto select bottom row
   -- TODO: filter out results when they don't match at all anymore.
 
-  local telescope = require('telescope')
-
-  local file_finder = telescope.finders.new {
+  local file_finder = finders.new {
     static = true,
 
-    fn_command = function() return 'git ls-files' end,
+    fn_command = function(self)
+      return {
+        command = 'git',
+        args = {'ls-files'}
+      }
+    end,
   }
 
-  local file_previewer = telescope.previewers.vim_buffer
+  local file_previewer = previewers.cat
 
-  local file_picker = telescope.pickers.new {
+  local file_picker = pickers.new {
     previewer = file_previewer
   }
 
   -- local file_sorter = telescope.sorters.get_ngram_sorter()
   -- local file_sorter = require('telescope.sorters').get_levenshtein_sorter()
-  local file_sorter = telescope.sorters.get_norcalli_sorter()
+  local file_sorter = sorters.get_norcalli_sorter()
 
   file_picker:find {
     prompt = 'Simple File',
@@ -35,5 +43,113 @@ builtin.git_files = function(_)
   }
 end
 
+builtin.live_grep = function()
+  local live_grepper = finders.new {
+    maximum_results = 1000,
+
+    fn_command = function(self, prompt)
+      -- TODO: Make it so that we can start searching on the first character.
+      if not prompt or prompt == "" then
+        return nil
+      end
+
+      return {
+        command = 'rg',
+        args = {"--vimgrep", prompt},
+      }
+    end
+  }
+
+  local file_previewer = previewers.vimgrep
+  local file_picker = pickers.new {
+    previewer = file_previewer
+  }
+
+  -- local file_sorter = telescope.sorters.get_ngram_sorter()
+  -- local file_sorter = require('telescope.sorters').get_levenshtein_sorter()
+  -- local file_sorter = sorters.get_norcalli_sorter()
+
+  -- Weight the results somehow to be more likely to be the ones that you've opened.
+  -- local old_files = {}
+  -- for _, f in ipairs(vim.v.oldfiles) do
+  --   old_files[f] = true
+  -- end
+
+  -- local oldfiles_sorter = sorters.new {
+  --   scoring_function = function(prompt, entry)
+  --     local line = entry.value
+
+  --     if not line then
+  --       return
+  --     end
+
+  --     local _, finish = string.find(line, ":")
+  --     local filename = string.sub(line, 1, finish - 1)
+  --     local expanded_fname = vim.fn.fnamemodify(filename, ':p')
+  --     if old_files[expanded_fname] then
+  --       print("Found oldfiles: ", entry.value)
+  --       return 0
+  --     else
+  --       return 1
+  --     end
+  --   end
+  -- }
+
+  file_picker:find {
+    prompt = 'Live Grep',
+    finder = live_grepper,
+    sorter = oldfiles_sorter,
+  }
+end
+
+builtin.lsp_references = function()
+  local params = vim.lsp.util.make_position_params()
+  params.context = { includeDeclaration = true }
+
+  local results_lsp = vim.lsp.buf_request_sync(0, "textDocument/references", params)
+  local locations = {}
+  for _, server_results in pairs(results_lsp) do
+    vim.list_extend(locations, vim.lsp.util.locations_to_items(server_results.result) or {})
+  end
+
+  local results = {}
+  for _, entry in ipairs(locations) do
+    local vimgrep_str = string.format(
+      "%s:%s:%s: %s",
+      vim.fn.fnamemodify(entry.filename, ":."),
+      entry.lnum,
+      entry.col,
+      entry.text
+    )
+
+    table.insert(results, {
+      valid = true,
+      value = entry,
+      ordinal = vimgrep_str,
+      display = vimgrep_str,
+    })
+  end
+
+  if vim.tbl_isempty(results) then
+    return
+  end
+
+  local lsp_reference_finder = finders.new {
+    results = results
+  }
+
+  local reference_previewer = previewers.qflist
+  local reference_picker = pickers.new {
+    previewer = reference_previewer
+  }
+
+  reference_picker:find {
+    prompt = 'LSP References',
+    finder = lsp_reference_finder,
+    sorter = sorters.get_norcalli_sorter(),
+  }
+end
+
+
 
 return builtin

lua/telescope/finders.lua

@@ -1,8 +1,15 @@
-local a = vim.api
+local Job = require('plenary.job')
+
 local log = require('telescope.log')
 
 local finders = {}
 
+
+-- TODO: We should make a few different "FinderGenerators":
+--  SimpleListFinder(my_list)
+--  FunctionFinder(my_func)
+--  JobFinder(my_job_args)
+
 ---@class Finder
 local Finder = {}
 
@@ -30,10 +37,14 @@ function Finder:new(opts)
   --    ...
   return setmetatable({
     results = opts.results,
+
     fn_command = opts.fn_command,
     static = opts.static,
     state = {},
-    job_id = -1,
+
+    -- Maximum number of results to process.
+    --  Particularly useful for live updating large queries.
+    maximum_results = opts.maximum_results,
   }, Finder)
 end
 
@@ -57,8 +68,8 @@ function Finder:_find(prompt, process_result, process_complete)
     return
   end
 
-  if (self.state.job_id or 0) > 0 then
-    vim.fn.jobstop(self.job_id)
+  if self.job and not self.job.is_shutdown then
+    self.job:shutdown()
   end
 
   log.info("Finding...")
@@ -78,30 +89,57 @@ function Finder:_find(prompt, process_result, process_complete)
 
   self.done = false
 
+  -- TODO: Should consider ways to allow "transformers" to be run here.
+  --        So that a finder can choose to "transform" the text into something much more easily usable.
+  local entries_processed = 0
+
+  local on_output = function(_, line, _)
+    if not line then
+      return
+    end
+
+    if maximum_results then
+      entries_processed = entries_processed + 1
+      if entries_processed > maximum_results then
+        log.info("Shutting down job early...")
+        self.job:shutdown()
+      end
+    end
+
+    if vim.trim(line) ~= "" then
+      line = line:gsub("\n", "")
+
+      process_result(line)
+
+      if self.static then
+        table.insert(self._cached_lines, line)
+      end
+    end
+  end
+
   -- TODO: How to just literally pass a list...
   -- TODO: How to configure what should happen here
   -- TODO: How to run this over and over?
-  self.job_id = vim.fn.jobstart(self:fn_command(prompt), {
-    stdout_buffered = true,
+  local opts = self:fn_command(prompt)
+  if not opts then return end
 
-    on_stdout = function(_, data, _)
-      for _, line in ipairs(data) do
-        if vim.trim(line) ~= "" then
-          process_result(line)
+  self.job = Job:new {
+    command = opts.command,
+    args = opts.args,
 
-          if self.static then
-            table.insert(self._cached_lines, line)
-          end
-        end
-      end
-    end,
+    maximum_results = self.maximum_results,
+
+    on_stdout = on_output,
+    on_stderr = on_output,
 
     on_exit = function()
       self.done = true
 
       process_complete()
     end,
-  })
+  }
+
+  self.job:start()
 end
 
 --- Return a new Finder

lua/telescope/init.lua

@@ -11,22 +11,15 @@ local state = require('telescope.state')
 local builtin = require('telescope.builtin')
 
 local telescope = {
-  -- <module>.new { }
-  finders = finders,
-  pickers = pickers,
-  previewers = previewers,
-  sorters = sorters,
+--   -- <module>.new { }
+--   finders = finders,
+--   pickers = pickers,
+--   previewers = previewers,
+--   sorters = sorters,
 
-  state = state,
+--   state = state,
 
-  builtin = builtin,
+--   builtin = builtin,
 }
 
-function __TelescopeOnLeave(prompt_bufnr)
-  local status = state.get_status(prompt_bufnr)
-  local picker = status.picker
-
-  picker:close_windows(status)
-end
-
 return telescope

lua/telescope/mappings.lua

@@ -52,18 +52,19 @@ keymap["control-p"] = function(prompt_bufnr, _)
 end
 
 keymap["enter"] = function(prompt_bufnr, results_bufnr)
-  local row = state.get_status(prompt_bufnr).picker:get_selection()
-  if row == nil then
-    print("Could not do anything...")
+  local entry = state.get_status(prompt_bufnr).picker:get_selection()
+
+  if not entry then
+    print("[telescope] Nothing currently selected")
     return
   else
-    local line = a.nvim_buf_get_lines(results_bufnr, row, row + 1, false)[1]
-    if line == nil then
+    local value = entry.value
+    if not value then
       print("Could not do anything with blank line...")
       return
     end
 
-    local sections = vim.split(line, ":")
+    local sections = vim.split(value, ":")
 
     local filename = sections[1]
     local row = tonumber(sections[2])
@@ -77,6 +78,8 @@ keymap["enter"] = function(prompt_bufnr, results_bufnr)
     if row and col then
       a.nvim_win_set_cursor(0, {row, col})
     end
+
+    vim.cmd [[stopinsert]]
   end
 end
 

lua/telescope/pickers.lua

@@ -1,12 +1,15 @@
 local a = vim.api
 local popup = require('popup')
 
-
 local log = require('telescope.log')
 local mappings = require('telescope.mappings')
 local state = require('telescope.state')
 local utils = require('telescope.utils')
 
+local Entry = require('telescope.entry')
+local Sorter = require('telescope.sorters').Sorter
+local Previewer = require('telescope.previewers').Previewer
+
 local pickers = {}
 
 --- Picker is the main UI that shows up to interact w/ your results.
@@ -14,10 +17,6 @@ local pickers = {}
 local Picker = {}
 Picker.__index = Picker
 
-
-local Sorter = require('telescope.sorters').Sorter
-local Previewer = require('telescope.previewers').Previewer
-
 assert(Sorter)
 assert(Previewer)
 
@@ -53,7 +52,9 @@ function Picker._get_window_options(max_columns, max_lines, prompt_title)
   }
 
   local width_padding = 10
-  if max_columns < 200 then
+  if max_columns < 150 then
+    preview.width = 60
+  elseif max_columns < 200 then
     preview.width = 80
   else
     preview.width = 120
@@ -94,7 +95,6 @@ function Picker:find(opts)
   assert(finder, "Finder is required to do picking")
 
   local sorter = opts.sorter
-
   local prompt_string = opts.prompt
 
   -- Create three windows:
@@ -107,6 +107,9 @@ function Picker:find(opts)
   local results_win, results_opts = popup.create('', popup_opts.results)
   local results_bufnr = a.nvim_win_get_buf(results_win)
 
+  -- TODO: Should probably always show all the line for results win, so should implement a resize for the windows
+  a.nvim_win_set_option(results_win, 'wrap', false)
+
   local preview_win, preview_opts = popup.create('', popup_opts.preview)
   local preview_bufnr = a.nvim_win_get_buf(preview_win)
 
@@ -124,28 +127,15 @@ function Picker:find(opts)
 
   -- First thing we want to do is set all the lines to blank.
   self.max_results = popup_opts.results.height - 1
-  local initial_lines = {}
-  for _ = 1, self.max_results do table.insert(initial_lines, "") end
-  vim.api.nvim_buf_set_lines(results_bufnr, 0, self.max_results, false, initial_lines)
+
+  vim.api.nvim_buf_set_lines(results_bufnr, 0, self.max_results, false, utils.repeated_table(self.max_results, ""))
 
   local on_lines = function(_, _, _, first_line, last_line)
     local prompt = vim.api.nvim_buf_get_lines(prompt_bufnr, first_line, last_line, false)[1]
 
-    -- Create a closure that has all the data we need
-    -- We pass a function called "newResult" to get_results
-    --    get_results calles "newResult" every time it gets a new result
-    --    picker then (if available) calls sorter
-    --    and then appropriately places new result in the buffer.
-
-    -- TODO: We need to fix the sorting
-    -- TODO: We should provide a simple fuzzy matcher in Lua for people
-    -- TODO: We should get all the stuff on the bottom line directly, not floating around
-    -- TODO: We need to handle huge lists in a good way, cause currently we'll just put too much stuff in the buffer
-    -- TODO: Stop having things crash if we have an error.
-
-    local line_manager = pickers.line_manager(
+    self.manager = pickers.entry_manager(
       self.max_results,
-      function(index, line)
+      vim.schedule_wrap(function(index, entry)
         local row = self.max_results - index + 1
 
         -- If it's less than 0, then we don't need to show it at all.
@@ -153,43 +143,48 @@ function Picker:find(opts)
           return
         end
 
-        log.trace("Setting row", row, "with value", line)
-        vim.api.nvim_buf_set_lines(results_bufnr, row, row + 1, false, {line})
+        -- log.info("Setting row", row, "with value", entry)
+        vim.api.nvim_buf_set_lines(results_bufnr, row, row + 1, false, {entry.display})
       end
-    )
+    ))
 
     local process_result = function(line)
-      if vim.trim(line) == "" then
+      local entry = Entry:new(line)
+
+      if not entry.valid then
         return
       end
 
-      log.trace("Processing result... ", line)
+      log.trace("Processing result... ", entry)
 
-      local sort_score = 0
-      local sort_ok
+      local sort_ok, sort_score = nil, 0
       if sorter then
         sort_ok, sort_score = pcall(function ()
-          return sorter:score(prompt, line)
+          return sorter:score(prompt, entry)
         end)
 
         if not sort_ok then
-          log.warn("Sorting failed with:", prompt, line, sort_score)
+          log.warn("Sorting failed with:", prompt, entry, sort_score)
           return
         end
 
         if sort_score == -1 then
-          log.trace("Filtering out result: ", line)
+          log.trace("Filtering out result: ", entry)
           return
         end
       end
 
-      line_manager:add_result(sort_score, line)
+      self.manager:add_entry(sort_score, entry)
     end
 
-    local process_complete = function()
-      local worst_line = self.max_results - line_manager.num_results()
+    local process_complete = vim.schedule_wrap(function()
+      local worst_line = self.max_results - self.manager.num_results()
+      if worst_line == 0 then
+        return
+      end
+
       local empty_lines = utils.repeated_table(worst_line, "")
-      -- vim.api.nvim_buf_set_lines(results_bufnr, 0, worst_line + 1, false, empty_lines)
+      vim.api.nvim_buf_set_lines(results_bufnr, 0, worst_line, false, empty_lines)
 
       log.debug("Worst Line after process_complete: %s", worst_line, results_bufnr)
 
@@ -201,7 +196,7 @@ function Picker:find(opts)
       --   a.nvim_buf_get_lines(results_bufnr, worst_line, self.max_results, false),
       --   self.line_scores
       -- )))
-    end
+    end)
 
     local ok, msg = pcall(function()
       return finder(prompt, process_result, process_complete)
@@ -229,7 +224,7 @@ function Picker:find(opts)
 
   -- TODO: Use WinLeave as well?
   local on_buf_leave = string.format(
-    [[  autocmd BufLeave <buffer> ++nested ++once :lua __TelescopeOnLeave(%s)]],
+    [[  autocmd BufLeave <buffer> ++nested ++once :lua require('telescope.pickers').on_close_prompt(%s)]],
     prompt_bufnr)
 
   vim.cmd([[augroup PickerInsert]])
@@ -304,11 +299,15 @@ end
 local ns_telescope_selection = a.nvim_create_namespace('telescope_selection')
 
 function Picker:get_selection()
-  return self.selection or self.max_results
+  return self._selection
+end
+
+function Picker:get_selection_row()
+  return self._selection_row or self.max_results
 end
 
 function Picker:move_selection(change)
-  self:set_selection(self:get_selection() + change)
+  self:set_selection(self:get_selection_row() + change)
 end
 
 function Picker:set_selection(row)
@@ -318,6 +317,7 @@ function Picker:set_selection(row)
     row = 1
   end
 
+  local entry = self.manager:get_entry(self.max_results - row + 1)
   local status = state.get_status(self.prompt_bufnr)
 
   a.nvim_buf_clear_namespace(status.results_bufnr, ns_telescope_selection, 0, -1)
@@ -334,14 +334,13 @@ function Picker:set_selection(row)
   -- TODO: Make sure you start exactly at the bottom selected
 
   -- TODO: Get row & text in the same obj
-  self.selection = row
+  self._selection = entry
+  self._selection_row = row
 
   if self.previewer then
     self.previewer:preview(
-      status.preview_win,
-      status.preview_bufnr,
-      status.results_bufnr,
-      row
+      entry,
+      status
     )
   end
 end
@@ -350,10 +349,10 @@ pickers.new = function(...)
   return Picker:new(...)
 end
 
--- TODO: We should consider adding `process_bulk` or `bulk_line_manager` for things
+-- TODO: We should consider adding `process_bulk` or `bulk_entry_manager` for things
 -- that we always know the items and can score quickly, so as to avoid drawing so much.
-pickers.line_manager = function(max_results, set_line)
-  log.debug("Creating line_manager...")
+pickers.entry_manager = function(max_results, set_entry)
+  log.debug("Creating entry_manager...")
 
   -- state contains list of
   --    {
@@ -361,19 +360,24 @@ pickers.line_manager = function(max_results, set_line)
   --        line = ...
   --        metadata ? ...
   --    }
-  local line_state = {}
+  local entry_state = {}
 
-  set_line = set_line or function() end
+  set_entry = set_entry or function() end
 
   return setmetatable({
-    add_result = function(self, score, line)
+    add_entry = function(self, score, entry)
+      -- TODO: Consider forcing people to make these entries before we add them.
+      if type(entry) == "string" then
+        entry = Entry:new(entry)
+      end
+
       score = score or 0
 
-      for index, item in ipairs(line_state) do
+      for index, item in ipairs(entry_state) do
         if item.score > score then
           return self:insert(index, {
             score = score,
-            line = line,
+            entry = entry,
           })
         end
 
@@ -385,36 +389,44 @@ pickers.line_manager = function(max_results, set_line)
 
       return self:insert({
         score = score,
-        line = line,
+        entry = entry,
       })
     end,
 
-    insert = function(self, index, item)
-      if item == nil then
-        item = index
-        index = #line_state + 1
+    insert = function(self, index, entry)
+      if entry == nil then
+        entry = index
+        index = #entry_state + 1
       end
 
       -- To insert something, we place at the next available index (or specified index)
       -- and then shift all the corresponding items one place.
-      local next_item
+      local next_entry
       repeat
-        next_item = line_state[index]
+        next_entry = entry_state[index]
 
-        set_line(index, item.line)
-        line_state[index] = item
+        set_entry(index, entry.entry)
+        entry_state[index] = entry
 
         index = index + 1
-        item = next_item
-      until not next_item
+        entry = next_entry
+      until not next_entry
     end,
 
     num_results = function()
-      return #line_state
+      return #entry_state
+    end,
+
+    get_ordinal = function(self, index)
+      return self:get_entry(index).ordinal
+    end,
+
+    get_entry = function(_, index)
+      return (entry_state[index] or {}).entry
     end,
 
     _get_state = function()
-      return line_state
+      return entry_state
     end,
   }, {
     -- insert =
@@ -428,4 +440,13 @@ pickers.line_manager = function(max_results, set_line)
 end
 
 
+
+function pickers.on_close_prompt(prompt_bufnr)
+  local status = state.get_status(prompt_bufnr)
+  local picker = status.picker
+
+  picker:close_windows(status)
+end
+
+
 return pickers

lua/telescope/previewers.lua

@@ -9,12 +9,22 @@ function Previewer:new(opts)
   opts = opts or {}
 
   return setmetatable({
+    state = nil,
+    _setup_func = opts.setup,
     preview_fn = opts.preview_fn,
   }, Previewer)
 end
 
-function Previewer:preview(preview_win, preview_bufnr, results_bufnr, row)
-  return self.preview_fn(preview_win, preview_bufnr, results_bufnr, row)
+function Previewer:preview(entry, status)
+  if not entry then
+    return
+  end
+
+  if not self.state and self._setup_func then
+    self.state = self._setup_func()
+  end
+
+  return self:preview_fn(entry, status)
 end
 
 previewers.new = function(...)
@@ -22,12 +32,12 @@ previewers.new = function(...)
 end
 
 previewers.vim_buffer = previewers.new {
-  preview_fn = function(preview_win, preview_bufnr, results_bufnr, row)
-    local line = vim.api.nvim_buf_get_lines(results_bufnr, row, row + 1, false)[1]
-    if line == nil then
+  preview_fn = function(_, entry, status)
+    local value = entry.value
+    if value == nil then
       return
     end
-    local file_name = vim.split(line, ":")[1]
+    local file_name = vim.split(value, ":")[1]
 
     log.trace("Previewing File: %s", file_name)
 
@@ -39,23 +49,24 @@ previewers.vim_buffer = previewers.new {
 
     -- TODO: We should probably call something like this because we're not always getting highlight and all that stuff.
     -- api.nvim_command('doautocmd filetypedetect BufRead ' .. vim.fn.fnameescape(filename))
-    vim.api.nvim_win_set_buf(preview_win, bufnr)
-    vim.api.nvim_win_set_option(preview_win, 'wrap', false)
-    vim.api.nvim_win_set_option(preview_win, 'winhl', 'Normal:Normal')
+    vim.api.nvim_win_set_buf(status.preview_win, bufnr)
+    vim.api.nvim_win_set_option(status.preview_win, 'wrap', false)
+    vim.api.nvim_win_set_option(status.preview_win, 'winhl', 'Normal:Normal')
     -- vim.api.nvim_win_set_option(preview_win, 'winblend', 20)
-    vim.api.nvim_win_set_option(preview_win, 'signcolumn', 'no')
-    vim.api.nvim_win_set_option(preview_win, 'foldlevel', 100)
+    vim.api.nvim_win_set_option(status.preview_win, 'signcolumn', 'no')
+    vim.api.nvim_win_set_option(status.preview_win, 'foldlevel', 100)
   end,
 }
 
 
 previewers.vim_buffer_or_bat = previewers.new {
-  preview_fn = function(preview_win, preview_bufnr, results_bufnr, row)
-    local line = vim.api.nvim_buf_get_lines(results_bufnr, row, row + 1, false)[1]
-    if line == nil then
+  preview_fn = function(_, entry, status)
+      local value = entry.value
+    if value == nil then
       return
     end
-    local file_name = vim.split(line, ":")[1]
+
+    local file_name = vim.split(value, ":")[1]
 
     log.info("Previewing File: %s", file_name)
 
@@ -69,18 +80,115 @@ previewers.vim_buffer_or_bat = previewers.new {
 
       -- TODO: We should probably call something like this because we're not always getting highlight and all that stuff.
       -- api.nvim_command('doautocmd filetypedetect BufRead ' .. vim.fn.fnameescape(filename))
-      vim.api.nvim_win_set_buf(preview_win, bufnr)
-      vim.api.nvim_win_set_option(preview_win, 'wrap', false)
-      vim.api.nvim_win_set_option(preview_win, 'winhl', 'Normal:Normal')
+      vim.api.nvim_win_set_buf(status.preview_win, bufnr)
+      vim.api.nvim_win_set_option(status.preview_win, 'wrap', false)
+      vim.api.nvim_win_set_option(status.preview_win, 'winhl', 'Normal:Normal')
       -- vim.api.nvim_win_set_option(preview_win, 'winblend', 20)
-      vim.api.nvim_win_set_option(preview_win, 'signcolumn', 'no')
-      vim.api.nvim_win_set_option(preview_win, 'foldlevel', 100)
+      vim.api.nvim_win_set_option(status.preview_win, 'signcolumn', 'no')
+      vim.api.nvim_win_set_option(status.preview_win, 'foldlevel', 100)
     else
-      vim.api.nvim_buf_set_lines(preview_bufnr, 0, -1, false, vim.fn.systemlist(string.format('bat %s', file_name)))
+      vim.api.nvim_buf_set_lines(status.preview_bufnr, 0, -1, false, vim.fn.systemlist(string.format('bat %s', file_name)))
     end
   end,
 }
 
+previewers.cat = previewers.new {
+  setup = function()
+    local command_string = "cat %s"
+    if vim.fn.executable("bat") then
+      command_string = "bat %s --style=grid --paging=always"
+    end
+
+    return {
+      command_string = command_string
+    }
+  end,
+
+  preview_fn = function(self, entry, status)
+    local bufnr = vim.api.nvim_create_buf(false, true)
+
+    vim.api.nvim_win_set_buf(status.preview_win, bufnr)
+
+    -- HACK! Requires `termopen` to accept buffer argument.
+    vim.cmd(string.format("noautocmd call win_gotoid(%s)", status.preview_win))
+    vim.fn.termopen(string.format(self.state.command_string, entry.value))
+    vim.cmd(string.format("noautocmd call win_gotoid(%s)", status.prompt_win))
+
+    vim.api.nvim_buf_set_name(bufnr, tostring(bufnr))
+  end
+}
+
+previewers.vimgrep = previewers.new {
+  setup = function()
+    local command_string = "cat %s"
+    if vim.fn.executable("bat") then
+      command_string = "bat %s --style=grid --paging=always --highlight-line %s -r %s:%s"
+    end
+
+    return {
+      command_string = command_string
+    }
+  end,
+
+  preview_fn = function(self, entry, status)
+    local bufnr = vim.api.nvim_create_buf(false, true)
+    local win_id = status.preview_win
+    local height = vim.api.nvim_win_get_height(win_id)
+
+    local line = entry.value
+    if type(line) == "table" then
+      line = entry.ordinal
+    end
+
+    local _, _, filename, lnum, col, text = string.find(line, [[([^:]+):(%d+):(%d+):(.*)]])
+
+    local context = math.floor(height / 2)
+    local start = math.max(0, lnum - context)
+    local finish = lnum + context
+
+    vim.api.nvim_win_set_buf(status.preview_win, bufnr)
+
+    -- HACK! Requires `termopen` to accept buffer argument.
+    vim.cmd(string.format("noautocmd call win_gotoid(%s)", status.preview_win))
+    vim.fn.termopen(string.format(self.state.command_string, filename, lnum, start, finish))
+    vim.cmd(string.format("noautocmd call win_gotoid(%s)", status.prompt_win))
+
+  end
+}
+
+previewers.qflist = previewers.new {
+  setup = function()
+    local command_string = "cat %s"
+    if vim.fn.executable("bat") then
+      command_string = "bat %s --style=grid --paging=always --highlight-line %s -r %s:%s"
+    end
+
+    return {
+      command_string = command_string
+    }
+  end,
+
+  preview_fn = function(self, entry, status)
+    local bufnr = vim.api.nvim_create_buf(false, true)
+    local win_id = status.preview_win
+    local height = vim.api.nvim_win_get_height(win_id)
+
+    local filename = entry.value.filename
+    local lnum = entry.value.lnum
+
+    local context = math.floor(height / 2)
+    local start = math.max(0, lnum - context)
+    local finish = lnum + context
+
+    vim.api.nvim_win_set_buf(status.preview_win, bufnr)
+
+    -- HACK! Requires `termopen` to accept buffer argument.
+    vim.cmd(string.format("noautocmd call win_gotoid(%s)", status.preview_win))
+    vim.fn.termopen(string.format(self.state.command_string, filename, lnum, start, finish))
+    vim.cmd(string.format("noautocmd call win_gotoid(%s)", status.prompt_win))
+  end
+}
+
 previewers.Previewer = Previewer
 
 return previewers

lua/telescope/sorters.lua

@@ -1,5 +1,3 @@
-local ceil = math.ceil
-
 local log = require('telescope.log')
 local util = require('telescope.utils')
 
@@ -26,8 +24,9 @@ function Sorter:new(opts)
   }, Sorter)
 end
 
-function Sorter:score(prompt, line)
-  return self:scoring_function(prompt, line)
+function Sorter:score(prompt, entry)
+  -- TODO: Decide if we actually want to check the type every time.
+  return self:scoring_function(prompt, type(entry) == "string" and entry or entry.ordinal)
 end
 
 function sorters.new(...)
@@ -143,6 +142,10 @@ sorters.get_norcalli_sorter = function()
         return -1
       end
 
+      if #prompt > 2 and denominator < 0.5 then
+        return -1
+      end
+
       return 1 / denominator
     end
   }

lua/telescope/state.lua

@@ -1,14 +1,14 @@
 local state = {}
 
-state._statuses = {}
+TelescopeGlobalState = TelescopeGlobalState or {}
 
 --- Set the status for a particular prompt bufnr
 function state.set_status(prompt_bufnr, status)
-  state._statuses[prompt_bufnr] = status
+  TelescopeGlobalState[prompt_bufnr] = status
 end
 
 function state.get_status(prompt_bufnr)
-  return state._statuses[prompt_bufnr] or {}
+  return TelescopeGlobalState[prompt_bufnr] or {}
 end
 
 function state.clear_status(prompt_bufnr)