diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 0000000..e29383c
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,19 @@
+name: Linting and style checking
+
+on: [push, pull_request]
+
+jobs:
+  luacheck:
+    name: Luacheck
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Prepare
+        run: |
+          sudo apt-get update
+          sudo apt-get install luarocks
+          sudo luarocks install luacheck
+
+      - name: Lint
+        run: sudo make lint
diff --git a/.luacheckrc b/.luacheckrc
new file mode 100644
index 0000000..0fb34a9
--- /dev/null
+++ b/.luacheckrc
@@ -0,0 +1,26 @@
+-- Rerun tests only if their modification time changed.
+cache = true
+
+std = luajit
+codes = true
+
+self = false
+
+-- Glorious list of warnings: https://luacheck.readthedocs.io/en/stable/warnings.html
+ignore = {
+  "212", -- Unused argument, In the case of callback function, _arg_name is easier to understand than _, so this option is set to off.
+  "122", -- Indirectly setting a readonly global
+}
+
+globals = {
+  "TelescopeGlobalState",
+  "TelescopeCachedUppers",
+  "TelescopeCachedTails",
+  "TelescopeCachedNgrams",
+  "_TelescopeConfigurationValues",
+}
+
+-- Global objects defined by the C code
+read_globals = {
+  "vim",
+}
diff --git a/Makefile b/Makefile
index ca6b84d..982d6c6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,5 @@
 test:
 	nvim --headless -c 'lua require("plenary.test_harness"):test_directory("busted", "./lua/tests/automated/")'
+
+lint:
+	luacheck lua/telescope
diff --git a/lua/telescope/_compat.lua b/lua/telescope/_compat.lua
index 3d280ef..6253074 100644
--- a/lua/telescope/_compat.lua
+++ b/lua/telescope/_compat.lua
@@ -1,4 +1,3 @@
-
 vim.deepcopy = (function()
   local function _id(v)
     return v
@@ -55,17 +54,3 @@ vim.deepcopy = (function()
     end
   end
 end)()
-
-
-
-table.clear = table.clear or function(t)
-  for k in pairs (t) do
-      t[k] = nil
-  end
-end
-
-table.pop = table.pop or function(t, k)
-  local val = t[k]
-  t[k] = nil
-  return val
-end
diff --git a/lua/telescope/_private/NGRam.lua b/lua/telescope/_private/NGRam.lua
deleted file mode 100644
index 15006c6..0000000
--- a/lua/telescope/_private/NGRam.lua
+++ /dev/null
@@ -1,109 +0,0 @@
-local NGram = {}
-NGram.__index = NGram
-
-function NGram:new(opts)
-  -- TODO: Add padding
-  opts = opts or {}
-  return setmetatable({
-    N = opts.N or 2,
-    split = opts.split or "/",
-    _depth = 5,
-    _grams = setmetatable({}, utils.default_table_mt)
-  }, self)
-end
-
-local min = math.min
-
-function NGram:_split(word)
-  local word_len = #word
-
-  local result = {}
-  for i = 1, word_len - 1 do
-    -- for j = i + (self.N - 1), min(i + self._depth - 1, word_len) do
-    --   table.insert(result, string.sub(word, i, j))
-    -- end
-    table.insert(result, string.sub(word, i, i + self.N - 1))
-  end
-
-  return result
-end
-
--- local function pairsByKeys (t, f)
---   local a = {}
---   for n in pairs(t) do table.insert(a, n) end
---   table.sort(a, f)
---   local i = 0      -- iterator variable
---   local iter = function ()   -- iterator function
---     i = i + 1
---     if a[i] == nil then return nil
---     else return a[i], t[a[i]]
---     end
---   end
---   return iter
--- end
-
-function NGram:add(word)
-  local split_word = self:_split(word)
-
-  for _, k in ipairs(split_word) do
-    local counts = self._grams[k]
-    if counts[word] == nil then
-      counts[word] = 0
-    end
-
-    counts[word] = counts[word] + 1
-  end
-end
-
-function NGram:_items_sharing_ngrams(query)
-  local split_query = self:_split(query)
-
-  -- Matched string to number of N-grams shared with the query string.
-  local shared = {}
-
-  local remaining = {}
-
-  for _, ngram in ipairs(split_query) do
-    remaining = {}
-    for match, count in pairs(self._grams[ngram] or {}) do
-      remaining[match] = remaining[match] or count
-
-      if remaining[match] > 0 then
-        remaining[match] = remaining[match] - 1
-        shared[match] = (shared[match] or 0) + 1
-      end
-    end
-  end
-
-  return shared
-end
-
-function NGram:search(query, show_values)
-  local sharing_ngrams = self:_items_sharing_ngrams(query)
-
-  local results = {}
-  for name, count in pairs(sharing_ngrams) do
-    local allgrams = #query + #name - (2 * self.N) - count + 2
-    table.insert(results, {name, count / allgrams})
-  end
-
-  table.sort(results, function(left, right)
-    return left[2] > right[2]
-  end)
-
-  if not show_values then
-    for k, v in ipairs(results) do
-      results[k] = v[1]
-    end
-  end
-
-  return results
-end
-
-function NGram:find(query)
-  return self:search(query)[1]
-end
-
-function NGram:score(query)
-  return (self:search(query, true)[1] or {})[2] or 0
-end
diff --git a/lua/telescope/actions/init.lua b/lua/telescope/actions/init.lua
index e479d1b..aaeffab 100644
--- a/lua/telescope/actions/init.lua
+++ b/lua/telescope/actions/init.lua
@@ -198,7 +198,7 @@ actions.edit_register = function(prompt_bufnr)
 
   -- update entry in results table
   -- TODO: find way to redraw finder content
-  for k, v in pairs(picker.finder.results) do
+  for _, v in pairs(picker.finder.results) do
     if v == entry then
       v.content = updated_value
     end
diff --git a/lua/telescope/actions/mt.lua b/lua/telescope/actions/mt.lua
index 909e7bb..5ad14a1 100644
--- a/lua/telescope/actions/mt.lua
+++ b/lua/telescope/actions/mt.lua
@@ -1,5 +1,4 @@
-
-local action_mt = {}   
+local action_mt = {}
 
 action_mt.create = function(mod)
   local mt = {
diff --git a/lua/telescope/builtin/files.lua b/lua/telescope/builtin/files.lua
index 15d657a..c1c947f 100644
--- a/lua/telescope/builtin/files.lua
+++ b/lua/telescope/builtin/files.lua
@@ -71,7 +71,8 @@ files.find_files = function(opts)
   end
 
   if not find_command then
-    print("You need to install either find, fd, or rg. You can also submit a PR to add support for another file finder :)")
+    print("You need to install either find, fd, or rg. " ..
+          "You can also submit a PR to add support for another file finder :)")
     return
   end
 
diff --git a/lua/telescope/builtin/internal.lua b/lua/telescope/builtin/internal.lua
index 42f1893..0b2b626 100644
--- a/lua/telescope/builtin/internal.lua
+++ b/lua/telescope/builtin/internal.lua
@@ -54,8 +54,7 @@ internal.planets = function(opts)
   local globbed_files = vim.fn.globpath(base_directory .. '/data/memes/planets/', '*', true, true)
   local acceptable_files = {}
   for _, v in ipairs(globbed_files) do
-    if not show_pluto and v:find("pluto") then
-    else
+    if show_pluto or not v:find("pluto") then
       table.insert(acceptable_files,vim.fn.fnamemodify(v, ':t'))
     end
   end
@@ -212,7 +211,8 @@ end
 
 internal.vim_options = function(opts)
   -- Load vim options.
-  local vim_opts = loadfile(utils.data_directory() .. path.separator .. 'options' .. path.separator .. 'options.lua')().options
+  local vim_opts = loadfile(utils.data_directory() .. path.separator .. 'options' ..
+                            path.separator .. 'options.lua')().options
 
   pickers.new(opts, {
     prompt = 'options',
@@ -250,12 +250,13 @@ internal.vim_options = function(opts)
         -- float_opts.anchor = "sw"
         -- float_opts.focusable = false
         -- float_opts.style = "minimal"
-        -- float_opts.row = vim.api.nvim_get_option("lines") - 2 -- TODO: include `cmdheight` and `laststatus` in this calculation
+        -- float_opts.row = vim.api.nvim_get_option("lines") - 2 -- TODO: inc `cmdheight` and `laststatus` in this calc
         -- float_opts.col = 2
         -- float_opts.height = 10
         -- float_opts.width = string.len(selection.last_set_from)+15
         -- local buf = vim.fn.nvim_create_buf(false, true)
-        -- vim.fn.nvim_buf_set_lines(buf, 0, 0, false, {"default value: abcdef", "last set from: " .. selection.last_set_from})
+        -- vim.fn.nvim_buf_set_lines(buf, 0, 0, false,
+        --                           {"default value: abcdef", "last set from: " .. selection.last_set_from})
         -- local status_win = vim.fn.nvim_open_win(buf, false, float_opts)
         -- -- vim.api.nvim_win_set_option(status_win, "winblend", 100)
         -- vim.api.nvim_win_set_option(status_win, "winhl", "Normal:PmenuSel")
@@ -308,9 +309,7 @@ internal.help_tags = function(opts)
 end
 
 internal.man_pages = function(opts)
-  local cmd = opts.man_cmd or "apropos --sections=1 ''"
-
-  local pages = utils.get_os_command_output(cmd)
+  local pages = utils.get_os_command_output(opts.man_cmd or "apropos --sections=1 ''")
 
   local lines = {}
   for s in pages:gmatch("[^\r\n]+") do
@@ -350,7 +349,9 @@ internal.reloader = function(opts)
   -- filter out packages we don't want and track the longest package name
   opts.column_len = 0
   for index, module_name in pairs(package_list) do
-    if type(require(module_name)) ~= 'table' or module_name:sub(1,1) == "_" or package.searchpath(module_name, package.path) == nil then
+    if type(require(module_name)) ~= 'table' or
+       module_name:sub(1,1) == "_" or
+       package.searchpath(module_name, package.path) == nil then
       table.remove(package_list, index)
     elseif #module_name > opts.column_len then
       opts.column_len = #module_name
@@ -649,10 +650,10 @@ internal.autocommands = function(opts)
     previewer = previewers.autocommands.new(opts),
     sorter = conf.generic_sorter(opts),
     attach_mappings = function(prompt_bufnr)
-      actions._goto_file_selection:replace(function(_, cmd)
+      actions._goto_file_selection:replace(function(_, vim_cmd)
         local selection = actions.get_selected_entry()
         actions.close(prompt_bufnr)
-        vim.cmd(cmd .. ' ' .. selection.value)
+        vim.cmd(vim_cmd .. ' ' .. selection.value)
       end)
 
       return true
diff --git a/lua/telescope/builtin/lsp.lua b/lua/telescope/builtin/lsp.lua
index 4505101..d90052d 100644
--- a/lua/telescope/builtin/lsp.lua
+++ b/lua/telescope/builtin/lsp.lua
@@ -2,7 +2,6 @@ local actions = require('telescope.actions')
 local finders = require('telescope.finders')
 local make_entry = require('telescope.make_entry')
 local pickers = require('telescope.pickers')
-local previewers = require('telescope.previewers')
 local utils = require('telescope.utils')
 
 local conf = require('telescope.config').values
diff --git a/lua/telescope/config.lua b/lua/telescope/config.lua
index 1f793b8..de01fbd 100644
--- a/lua/telescope/config.lua
+++ b/lua/telescope/config.lua
@@ -52,13 +52,17 @@ function config.set_defaults(defaults)
   set("border", {})
   set("borderchars", { '─', '│', '─', '│', '╭', '╮', '╯', '╰'})
 
-  set("get_status_text", function(self) return string.format("%s / %s", self.stats.processed - self.stats.filtered, self.stats.processed) end)
+  set("get_status_text", function(self)
+    return string.format("%s / %s", self.stats.processed - self.stats.filtered, self.stats.processed)
+  end)
 
   -- Builtin configuration
 
   -- List that will be executed.
   --    Last argument will be the search term (passed in during execution)
-  set("vimgrep_arguments", {'rg', '--color=never', '--no-heading', '--with-filename', '--line-number', '--column', '--smart-case'})
+  set("vimgrep_arguments",
+      {'rg', '--color=never', '--no-heading', '--with-filename', '--line-number', '--column', '--smart-case'}
+  )
   set("use_less", true)
   set("color_devicons", true)
 
diff --git a/lua/telescope/debounce.lua b/lua/telescope/debounce.lua
index 329cdc5..d223e41 100644
--- a/lua/telescope/debounce.lua
+++ b/lua/telescope/debounce.lua
@@ -9,8 +9,8 @@ local function td_validate(fn, ms)
     fn = { fn, 'f' },
     ms = {
       ms,
-      function(ms)
-        return type(ms) == 'number' and ms > 0
+      function(v)
+        return type(v) == 'number' and v > 0
       end,
       "number > 0",
     },
diff --git a/lua/telescope/entry_manager.lua b/lua/telescope/entry_manager.lua
index fea0b7a..ec1ec2b 100644
--- a/lua/telescope/entry_manager.lua
+++ b/lua/telescope/entry_manager.lua
@@ -32,7 +32,7 @@ function EntryManager:new(max_results, set_entry, info)
       return #entry_state
     end,
 
-    get_ordinal = function(self, index)
+    get_ordinal = function(_, index)
       return self:get_entry(index).ordinal
     end,
 
diff --git a/lua/telescope/finders.lua b/lua/telescope/finders.lua
index 3943a51..f968ad3 100644
--- a/lua/telescope/finders.lua
+++ b/lua/telescope/finders.lua
@@ -133,9 +133,9 @@ function OneshotJobFinder:new(opts)
       end
     })
 
-    local job_opts = finder:fn_command(prompt)
+    local job_opts = finder:fn_command(_)
     if not job_opts then
-      error(debug.trackeback("expected `job_opts` from fn_command"))
+      error(debug.traceback("expected `job_opts` from fn_command"))
     end
 
     local writer = nil
diff --git a/lua/telescope/make_entry.lua b/lua/telescope/make_entry.lua
index 66cbcd1..aee7f86 100644
--- a/lua/telescope/make_entry.lua
+++ b/lua/telescope/make_entry.lua
@@ -77,7 +77,7 @@ do
 
     mt_file_entry.cwd = cwd
     mt_file_entry.display = function(entry)
-      local display, hl_group = entry.value, nil
+      local display, hl_group = entry.value
       if shorten_path then
         display = utils.path_shorten(display)
       end
@@ -168,8 +168,6 @@ do
 
     mt_vimgrep_entry.cwd = vim.fn.expand(opts.cwd or vim.fn.getcwd())
     mt_vimgrep_entry.display = function(entry)
-      local display, hl_group = entry.value, nil
-
       local display_filename
       if shorten_path then
         display_filename = utils.path_shorten(entry.filename)
@@ -182,7 +180,7 @@ do
         coordinates = string.format("%s:%s:", entry.lnum, entry.col)
       end
 
-      display, hl_group = transform_devicons(
+      local display, hl_group = transform_devicons(
         entry.filename,
         string.format(display_string, display_filename,  coordinates, entry.text),
         disable_devicons
@@ -215,9 +213,7 @@ do
   end
 end
 
-function make_entry.gen_from_git_commits(opts)
-  opts = opts or {}
-
+function make_entry.gen_from_git_commits()
   return function(entry)
     if entry == "" then
       return nil
@@ -361,7 +357,7 @@ function make_entry.gen_from_treesitter(opts)
 
   return function(entry)
     local ts_utils = require('nvim-treesitter.ts_utils')
-    local start_row, start_col, end_row, end_col = ts_utils.get_node_range(entry.node)
+    local start_row, start_col, end_row, _ = ts_utils.get_node_range(entry.node)
     local node_text = ts_utils.get_node_text(entry.node)[1]
     return {
       valid = true,
@@ -420,9 +416,7 @@ function make_entry.gen_from_packages(opts)
   end
 end
 
-function make_entry.gen_from_apropos(opts)
-  opts = opts or {}
-
+function make_entry.gen_from_apropos()
   return function(line)
     local cmd, _, desc = line:match("^(.*)%s+%((.*)%)%s+%-%s(.*)$")
 
@@ -481,21 +475,21 @@ function make_entry.gen_from_registers(_)
 end
 
 function make_entry.gen_from_highlights()
+  local make_display = function(entry)
+    local display = entry.value
+    return display, { { { 0, #display }, display } }
+  end
+
+  local preview_command = function(entry, bufnr)
+    local hl = entry.value
+    vim.api.nvim_buf_set_option(bufnr, 'filetype', 'vim')
+    local output = vim.split(vim.fn.execute('hi ' .. hl), '\n')
+    local start = string.find(output[2], 'xxx', 1, true)
+    vim.api.nvim_buf_set_lines(bufnr, 0, -1, true, output)
+    vim.api.nvim_buf_add_highlight(bufnr, -1, hl, 1, start - 1, start + 2)
+  end
+
   return function(entry)
-    local make_display = function(entry)
-      local display = entry.value
-      return display, { { { 0, #display }, display } }
-    end
-
-    local preview_command = function(entry, bufnr)
-      local hl = entry.value
-      vim.api.nvim_buf_set_option(bufnr, 'filetype', 'vim')
-      local output = vim.split(vim.fn.execute('hi ' .. hl), '\n')
-      local start = string.find(output[2], 'xxx', 1, true)
-      vim.api.nvim_buf_set_lines(bufnr, 0, -1, true, output)
-      vim.api.nvim_buf_add_highlight(bufnr, -1, hl, 1, start - 1, start + 2)
-    end
-
     return {
       value = entry,
       display = make_display,
@@ -508,12 +502,6 @@ function make_entry.gen_from_highlights()
 end
 
 function make_entry.gen_from_vimoptions()
-
-  -- TODO: Can we just remove this from `options.lua`?
-  function N_(s)
-    return s
-  end
-
   local process_one_opt = function(o)
     local ok, value_origin
 
diff --git a/lua/telescope/path.lua b/lua/telescope/path.lua
index cdfbc48..0a47a83 100644
--- a/lua/telescope/path.lua
+++ b/lua/telescope/path.lua
@@ -4,7 +4,6 @@ local path = {}
 path.separator = package.config:sub(1, 1)
 path.home = vim.fn.expand("~")
 
-
 path.make_relative = function(filepath, cwd)
   if not cwd or not filepath then return filepath end
 
@@ -83,14 +82,14 @@ path.read_file = function(filepath)
 end
 
 path.read_file_async = function(filepath, callback)
-  vim.loop.fs_open(filepath, "r", 438, function(err, fd)
-    assert(not err, err)
-    vim.loop.fs_fstat(fd, function(err, stat)
-      assert(not err, err)
-      vim.loop.fs_read(fd, stat.size, 0, function(err, data)
-        assert(not err, err)
-        vim.loop.fs_close(fd, function(err)
-          assert(not err, err)
+  vim.loop.fs_open(filepath, "r", 438, function(err_open, fd)
+    assert(not err_open, err_open)
+    vim.loop.fs_fstat(fd, function(err_fstat, stat)
+      assert(not err_fstat, err_fstat)
+      vim.loop.fs_read(fd, stat.size, 0, function(err_read, data)
+        assert(not err_read, err_read)
+        vim.loop.fs_close(fd, function(err_close)
+          assert(not err_close, err_close)
           return callback(data)
         end)
       end)
diff --git a/lua/telescope/pickers.lua b/lua/telescope/pickers.lua
index bf35aa2..77d183b 100644
--- a/lua/telescope/pickers.lua
+++ b/lua/telescope/pickers.lua
@@ -328,7 +328,9 @@ function Picker:find()
   a.nvim_win_set_option(results_win, 'winhl', 'Normal:TelescopeNormal')
   a.nvim_win_set_option(results_win, 'winblend', self.window.winblend)
   local results_border_win = results_opts.border and results_opts.border.win_id
-  if results_border_win then vim.api.nvim_win_set_option(results_border_win, 'winhl', 'Normal:TelescopeResultsBorder') end
+  if results_border_win then
+    vim.api.nvim_win_set_option(results_border_win, 'winhl', 'Normal:TelescopeResultsBorder')
+  end
 
 
   local preview_win, preview_opts, preview_bufnr
@@ -339,8 +341,9 @@ function Picker:find()
     a.nvim_win_set_option(preview_win, 'winhl', 'Normal:TelescopeNormal')
     a.nvim_win_set_option(preview_win, 'winblend', self.window.winblend)
     local preview_border_win = preview_opts and preview_opts.border and preview_opts.border.win_id
-    if preview_border_win then vim.api.nvim_win_set_option(preview_border_win, 'winhl', 'Normal:TelescopePreviewBorder') end
-
+    if preview_border_win then
+      vim.api.nvim_win_set_option(preview_border_win, 'winhl', 'Normal:TelescopePreviewBorder')
+    end
   end
 
   -- TODO: We need to center this and make it prettier...
@@ -407,7 +410,9 @@ function Picker:find()
       return
     end
 
-    local prompt = vim.trim(vim.api.nvim_buf_get_lines(prompt_bufnr, first_line, last_line, false)[1]:sub(#prompt_prefix))
+    local prompt = vim.trim(
+      vim.api.nvim_buf_get_lines(prompt_bufnr, first_line, last_line, false)[1]:sub(#prompt_prefix)
+    )
 
     if self.sorter then
       self.sorter:_start(prompt)
@@ -448,7 +453,8 @@ function Picker:find()
         end
       end
 
-      local sort_ok, sort_score = nil, 0
+      local sort_ok
+      local sort_score = 0
       if self.sorter then
         sort_ok, sort_score = self:_track("_sort_time", pcall, self.sorter.score, self.sorter, prompt, entry)
 
@@ -472,7 +478,7 @@ function Picker:find()
     local process_complete = function()
       if self:is_done() then return end
 
-      -- TODO: We should either: always leave one result or make sure we actually clean up the results when nothing matches
+      -- TODO: Either: always leave one result or make sure we actually clean up the results when nothing matches
       if selection_strategy == 'row' then
         if self._selection_row == nil and self.default_selection_index ~= nil then
           self:set_selection(self:get_row(self.default_selection_index))
@@ -758,7 +764,9 @@ function Picker:set_selection(row)
     end
 
     local caret = '>'
-    local display = string.format('%s %s', caret, (a.nvim_buf_get_lines(results_bufnr, row, row + 1, false)[1] or ''):sub(3))
+    local display = string.format('%s %s', caret,
+      (a.nvim_buf_get_lines(results_bufnr, row, row + 1, false)[1] or ''):sub(3)
+    )
 
     -- TODO: You should go back and redraw the highlights for this line from the sorter.
     -- That's the only smart thing to do.
@@ -835,7 +843,7 @@ function Picker:entry_adder(index, entry, score)
   -- This is the two spaces to manage the '> ' stuff.
   -- Maybe someday we can use extmarks or floaty text or something to draw this and not insert here.
   -- until then, insert two spaces
-  local prefix = TELESCOPE_DEBUG and ('  ' .. score) or '  '
+  local prefix = '  '
   display = prefix .. display
 
   self:_increment("displayed")
@@ -851,7 +859,12 @@ function Picker:entry_adder(index, entry, score)
     if set_ok and display_highlights then
       -- TODO: This should actually be done during the cursor moving stuff annoyingly.... didn't see this bug yesterday.
       for _, hl_block in ipairs(display_highlights) do
-        a.nvim_buf_add_highlight(self.results_bufnr, ns_telescope_entry, hl_block[2], row, #prefix + hl_block[1][1], #prefix + hl_block[1][2])
+        a.nvim_buf_add_highlight(self.results_bufnr,
+                                 ns_telescope_entry,
+                                 hl_block[2],
+                                 row,
+                                 #prefix + hl_block[1][1],
+                                 #prefix + hl_block[1][2])
       end
     end
 
diff --git a/lua/telescope/pickers/entry_display.lua b/lua/telescope/pickers/entry_display.lua
index 2a156b6..a6bf8f9 100644
--- a/lua/telescope/pickers/entry_display.lua
+++ b/lua/telescope/pickers/entry_display.lua
@@ -1,46 +1,5 @@
-local log = require('telescope.log')
-
 local entry_display = {}
 
--- index are used to determine the correct order
--- elements = {
---   [1] = { element, max width }, -- max width should be greater than 0
---   [2] = { a, 0 } -- Use 0 to disable max width
---   [3] = { b, 0 } -- If b is nil, skip this column, should skip column for all rows
--- },
--- separator = " " -- either arbitrary string, when you wanna use the same separator between all elements
--- separator = { " ", ":" }  -- or table, where [1] is separator between elements[1] and elements[2], etc
-
--- TODO: Remove this and move ONLY to create method.
-
-local table_format = function(picker, elements, separator)
-  -- TODO: Truncate...
-  local win_width = vim.api.nvim_win_get_width(picker.results_win)
-
-  local output = ""
-  for k, v in ipairs(elements) do
-    local text = v[1]
-    local width = v[2]
-    if text ~= nil then
-      if k > 1 then
-        output = output .. (type(separator) == "table" and separator[k - 1] or separator)
-      end
-      if width then
-        if width == 0 then
-          output = output .. string.format("%s", text)
-        elseif width < 1 then
-          output = output .. string.format("%-" .. math.floor(width * win_width) .. "s", text)
-        else
-          output = output .. string.format("%-" .. width .."s", text)
-        end
-      else
-        output = output .. text
-      end
-    end
-  end
-  return output
-end
-
 local function truncate(str, len)
   -- TODO: This doesn't handle multi byte chars...
   if vim.fn.strdisplaywidth(str) > len then
@@ -94,9 +53,10 @@ entry_display.create = function(configuration)
 
     if configuration.separator_hl then
       local width = #configuration.separator or 1
-      local hl_start, hl_end = 0, 0
+
+      local hl_start, hl_end
       for _, v in ipairs(results) do
-        hl_start = hl_end + #tostring(v)
+        hl_start = (hl_end or 0) + #tostring(v)
         hl_end = hl_start + width
         table.insert(highlights, { { hl_start, hl_end }, configuration.separator_hl })
       end
@@ -122,8 +82,6 @@ entry_display.resolve = function(self, entry)
 
   if type(display) == 'string' then
     return display, display_highlights
-  elseif type(display) == 'table' then
-    return table_format(self, display, "│"), display_highlights
   end
 end
 
diff --git a/lua/telescope/pickers/layout_strategies.lua b/lua/telescope/pickers/layout_strategies.lua
index adf22ca..334ac2f 100644
--- a/lua/telescope/pickers/layout_strategies.lua
+++ b/lua/telescope/pickers/layout_strategies.lua
@@ -240,7 +240,7 @@ layout_strategies.vertical = function(self, max_columns, max_lines)
 
   -- Height
   local height_padding = math.max(
-    1, 
+    1,
     resolve.resolve_height(layout_config.height_padding or 3)(self, max_columns, max_lines)
   )
   local picker_height = max_lines - 2 * height_padding
diff --git a/lua/telescope/previewers.lua b/lua/telescope/previewers.lua
index a2877e0..d12211f 100644
--- a/lua/telescope/previewers.lua
+++ b/lua/telescope/previewers.lua
@@ -3,7 +3,6 @@ local context_manager = require('plenary.context_manager')
 local conf = require('telescope.config').values
 local debounce = require('telescope.debounce')
 local from_entry = require('telescope.from_entry')
-local log = require('telescope.log')
 local utils = require('telescope.utils')
 local path = require('telescope.path')
 
@@ -332,7 +331,7 @@ previewers.new_buffer_previewer = function(opts)
       self.state.bufnr = get_bufnr_by_bufname(self, self.state.bufname)
       vim.api.nvim_win_set_buf(status.preview_win, self.state.bufnr)
     else
-      bufnr = vim.api.nvim_create_buf(false, true)
+      local bufnr = vim.api.nvim_create_buf(false, true)
       set_bufnr(self, bufnr)
 
       vim.api.nvim_win_set_buf(status.preview_win, bufnr)
@@ -454,16 +453,16 @@ previewers.new_termopen_previewer = function(opts)
     }
 
     -- TODO(conni2461): Workaround for neovim/neovim#11751.
-    local get_cmd = function(status)
+    local get_cmd = function(st)
       local shell = vim.o.shell
       if string.find(shell, 'powershell.exe') or string.find(shell, 'cmd.exe') then
-        return opts.get_command(entry, status)
+        return opts.get_command(entry, st)
       else
         local env = {}
         for k, v in pairs(termopen_env) do
           table.insert(env, k .. '=' .. v)
         end
-        return table.concat(env, ' ') .. ' ' .. table.concat(opts.get_command(entry, status), ' ')
+        return table.concat(env, ' ') .. ' ' .. table.concat(opts.get_command(entry, st), ' ')
       end
     end
 
@@ -514,7 +513,8 @@ previewers.git_branch_log = defaulter(function(_)
   return previewers.new_termopen_previewer {
     get_command = function(entry)
       return { 'git', '-p', 'log', '--graph',
-               "--pretty=format:" .. add_quotes .. "%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr)%Creset" .. add_quotes,
+               "--pretty=format:" .. add_quotes .. "%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr)%Creset"
+               .. add_quotes,
                '--abbrev-commit', '--date=relative', entry.value }
     end
   }
@@ -533,10 +533,10 @@ previewers.cat = defaulter(function(opts)
 
   return previewers.new_termopen_previewer {
     get_command = function(entry)
-      local path = from_entry.path(entry, true)
-      if path == nil or path == '' then return end
+      local p = from_entry.path(entry, true)
+      if p == nil or p == '' then return end
 
-      return maker(path)
+      return maker(p)
     end
   }
 end, {})
@@ -569,9 +569,9 @@ previewers.vim_buffer_cat = defaulter(function(_)
 
     define_preview = function(self, entry, status)
       with_preview_window(status, nil, function()
-        local path = from_entry.path(entry, true)
-        if path == nil or path == '' then return end
-        file_maker_async(path, self.state.bufnr, self.state.bufname)
+        local p = from_entry.path(entry, true)
+        if p == nil or p == '' then return end
+        file_maker_async(p, self.state.bufnr, self.state.bufname)
       end)
     end
   }
@@ -598,10 +598,10 @@ previewers.vim_buffer_vimgrep = defaulter(function(_)
     define_preview = function(self, entry, status)
       with_preview_window(status, nil, function()
         local lnum = entry.lnum or 0
-        local path = from_entry.path(entry, true)
-        if path == nil or path == '' then return end
+        local p = from_entry.path(entry, true)
+        if p == nil or p == '' then return end
 
-        file_maker_sync(path, self.state.bufnr, self.state.bufname)
+        file_maker_sync(p, self.state.bufnr, self.state.bufname)
 
         if lnum ~= 0 then
           if self.state.last_set_bufnr then
@@ -739,15 +739,14 @@ previewers.help = defaulter(function(_)
         local escaped = vim.fn.escape(entry.value, special_chars)
         local tags = {}
 
-        local find_rtp_file = function(path, count)
-          return vim.fn.findfile(path, vim.o.runtimepath, count)
+        local find_rtp_file = function(p, count)
+          return vim.fn.findfile(p, vim.o.runtimepath, count)
         end
 
-        local matches = {}
         for _,file in pairs(find_rtp_file('doc/tags', -1)) do
           local f = assert(io.open(file, "rb"))
             for line in f:lines() do
-              matches = {}
+              local matches = {}
 
               for match in (line..delim):gmatch("(.-)" .. delim) do
                 table.insert(matches, match)
diff --git a/lua/telescope/themes.lua b/lua/telescope/themes.lua
index 809b853..eba3d11 100644
--- a/lua/telescope/themes.lua
+++ b/lua/telescope/themes.lua
@@ -17,7 +17,7 @@ function themes.get_dropdown(opts)
     layout_strategy = "center",
     results_title = false,
     preview_title = "Preview",
-    preview_cutoff = 1, -- Preview should always show (unless previewer = false) 
+    preview_cutoff = 1, -- Preview should always show (unless previewer = false)
     width = 80,
     results_height = 15,
     borderchars = {
diff --git a/lua/telescope/utils.lua b/lua/telescope/utils.lua
index 81f4408..e1ef7f3 100644
--- a/lua/telescope/utils.lua
+++ b/lua/telescope/utils.lua
@@ -79,10 +79,6 @@ utils.quickfix_items_to_entries = function(locations)
   return results
 end
 
-utils.new_ngram = function()
-  return require("telescope._private.NGram"):new()
-end
-
 -- TODO: Figure out how to do this... could include in plenary :)
 -- NOTE: Don't use this yet. It will segfault sometimes.
 --
@@ -142,7 +138,7 @@ function utils.buf_delete(bufnr)
   if bufnr == nil then return end
 
   -- Suppress the buffer deleted message for those with &report<2
-  start_report = vim.o.report
+  local start_report = vim.o.report
   if start_report < 2 then vim.o.report = 2 end
 
   if vim.api.nvim_buf_is_valid(bufnr) and vim.api.nvim_buf_is_loaded(bufnr) then
diff --git a/lua/tests/automated/telescope_spec.lua b/lua/tests/automated/telescope_spec.lua
index 933cfc5..dd437df 100644
--- a/lua/tests/automated/telescope_spec.lua
+++ b/lua/tests/automated/telescope_spec.lua
@@ -115,95 +115,6 @@ describe('Picker', function()
       assert.are.same(1, counts_executed)
     end)
   end)
-
-  -- describe('ngrams', function()
-  --   it('should capture intself in the ngram', function()
-  --     local n = utils.new_ngram()
-
-  --     n:add("hi")
-  --     assert.are.same(n._grams.hi, {hi = 1})
-  --   end)
-
-  --   it('should have repeated strings count more than once', function()
-  --     local n = utils.new_ngram()
-
-  --     n:add("llll")
-  --     assert.are.same(n._grams.ll, {llll = 3})
-  --   end)
-
-  --   describe('_items_sharing_ngrams', function()
-  --     -- it('should be able to find similar strings', function()
-  --     -- end)
-  --     local n
-  --     before_each(function()
-  --       n = utils.new_ngram()
-
-  --       n:add("SPAM")
-  --       n:add("SPAN")
-  --       n:add("EG")
-  --     end)
-
-  --     it('should find items at the start', function()
-  --       assert.are.same({ SPAM = 1, SPAN = 1 }, n:_items_sharing_ngrams("SP"))
-  --     end)
-
-  --     it('should find items at the end', function()
-  --       assert.are.same({ SPAM = 1, }, n:_items_sharing_ngrams("AM"))
-  --     end)
-
-  --     it('should find items at the end', function()
-  --       assert.are.same({ SPAM = 2, SPAN = 1}, n:_items_sharing_ngrams("PAM"))
-  --     end)
-  --   end)
-
-  --   describe('search', function()
-  --     describe('for simple strings', function()
-  --       local n
-  --       before_each(function()
-  --         n = utils.new_ngram()
-
-  --         n:add("SPAM")
-  --         n:add("SPAN")
-  --         n:add("EG")
-  --       end)
-
-  --       it('should sort for equal cases', function()
-  --         assert.are.same({ "SPAM", "SPAN" }, n:search("SPAM"))
-  --       end)
-
-  --       it('should sort for obvious cases', function()
-  --         assert.are.same({ "SPAM", "SPAN" }, n:search("PAM"))
-  --       end)
-  --     end)
-
-  --     describe('for file paths', function()
-  --       local n
-  --       before_each(function()
-  --         n = utils.new_ngram()
-
-  --         n:add("sho/rt")
-  --         n:add("telescope/init.lua")
-  --         n:add("telescope/utils.lua")
-  --         n:add("telescope/pickers.lua")
-  --         n:add("a/random/file/pickers.lua")
-  --         n:add("microscope/init.lua")
-  --       end)
-
-  --       it("should find exact match", function()
-  --         assert.are.same(n:find("telescope/init.lua"), "telescope/init.lua")
-  --         assert.are.same(n:score("telescope/init.lua"), 1)
-  --       end)
-
-  --       it("should find unique match", function()
-  --         assert.are.same(n:find("micro"), "microscope/init.lua")
-  --       end)
-
-  --       it("should find some match", function()
-  --         assert.are.same(n:find("telini"), "telescope/init.lua")
-  --       end)
-  --     end)
-  --   end)
-  -- end)
 end)
 
 describe('Sorters', function()