diff --git a/lua/telescope/_private/NGRam.lua b/lua/telescope/_private/NGRam.lua
new file mode 100644
index 0000000..15006c6
--- /dev/null
+++ b/lua/telescope/_private/NGRam.lua
@@ -0,0 +1,109 @@
+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/builtin.lua b/lua/telescope/builtin.lua
index cd7e4ab..43e57fc 100644
--- a/lua/telescope/builtin.lua
+++ b/lua/telescope/builtin.lua
@@ -8,50 +8,20 @@ local finders = require('telescope.finders')
 local previewers = require('telescope.previewers')
 local pickers = require('telescope.pickers')
 local sorters = require('telescope.sorters')
+local utils = require('telescope.utils')
 
 local builtin = {}
 
-local ifnil = function(x, was_nil, was_not_nil) if x == nil then return was_nil else return was_not_nil end end
-
 builtin.git_files = function(opts)
-  opts = opts or {}
-
-  local show_preview = ifnil(opts.show_preview, true, opts.show_preview)
-
-  local file_finder = finders.new {
-    static = true,
-
-    fn_command = function(self)
-      return {
-        command = 'git',
-        args = {'ls-files'}
-      }
-    end,
-  }
-
-  local file_previewer = previewers.cat
-
-  local file_picker = pickers.new {
-    previewer = show_preview and file_previewer,
-
-    selection_strategy = opts.selection_strategy,
-  }
-
-  -- local file_sorter = telescope.sorters.get_ngram_sorter()
-  -- local file_sorter = require('telescope.sorters').get_levenshtein_sorter()
-  local file_sorter = sorters.get_norcalli_sorter()
-
-  file_picker:find {
-    prompt = 'Simple File',
-    finder = file_finder,
-    sorter = file_sorter,
-
-    border = opts.border,
-    borderchars = opts.borderchars,
-  }
+  pickers.new(opts, {
+    prompt    = 'Git File',
+    finder    = finders.new_oneshot_job({ "git", "ls-files" }),
+    previewer = previewers.cat,
+    sorter    = sorters.get_norcalli_sorter(),
+  }):find()
 end
 
-builtin.live_grep = function()
+builtin.live_grep = function(opts)
   local live_grepper = finders.new {
     maximum_results = 1000,
 
@@ -68,15 +38,13 @@ builtin.live_grep = function()
     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()
+  pickers.new(opts, {
+    prompt    = 'Live Grep',
+    finder    = live_grepper,
+    previewer = previewers.vimgrep,
+  }):find()
 
+  -- TODO: Incorporate this.
   -- 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
@@ -102,15 +70,9 @@ builtin.live_grep = function()
   --     end
   --   end
   -- }
-
-  file_picker:find {
-    prompt = 'Live Grep',
-    finder = live_grepper,
-    sorter = oldfiles_sorter,
-  }
 end
 
-builtin.lsp_references = function()
+builtin.lsp_references = function(opts)
   local params = vim.lsp.util.make_position_params()
   params.context = { includeDeclaration = true }
 
@@ -120,87 +82,34 @@ builtin.lsp_references = function()
     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
+  local results = utils.quickfix_items_to_entries(locations)
 
   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(),
-  }
+  local reference_picker = pickers.new(opts, {
+    prompt    = 'LSP References',
+    finder    = finders.new_table(results),
+    previewer = previewers.qflist,
+    sorter    = sorters.get_norcalli_sorter(),
+  }):find()
 end
 
-builtin.quickfix = function()
+builtin.quickfix = function(opts)
   local locations = vim.fn.getqflist()
-
-  local results = {}
-  for _, entry in ipairs(locations) do
-    if not entry.filename then
-      entry.filename = vim.api.nvim_buf_get_name(entry.bufnr)
-    end
-
-    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
+  local results = utils.quickfix_items_to_entries(locations)
 
   if vim.tbl_isempty(results) then
     return
   end
 
-  local quickfix_finder = finders.new {
-    results = results
-  }
-
-  local quickfix_previewer = previewers.qflist
-  local quickfix_picker = pickers.new {
-    previewer = quickfix_previewer
-  }
-
-  quickfix_picker:find {
-    prompt = 'Quickfix',
-    finder = quickfix_finder,
-    sorter = sorters.get_norcalli_sorter(),
-  }
+  pickers.new(opts, {
+    prompt    = 'Quickfix',
+    finder    = finders.new_table(results),
+    previewer = previewers.qflist,
+    sorter    = sorters.get_norcalli_sorter(),
+  }):find()
 end
 
 builtin.grep_string = function(opts)
@@ -208,42 +117,23 @@ builtin.grep_string = function(opts)
 
   local search = opts.search or vim.fn.expand("<cword>")
 
-  local grepper = finders.new {
-    maximum_results = 10000,
-
-    -- TODO: We can optimize these.
-    -- static = true,
-
-    fn_command = function()
-      return {
-        command = 'rg',
-        args = {"--vimgrep", search},
-      }
-    end
-  }
-
-  local file_picker = pickers.new {
-    previewer = previewers.vimgrep
-  }
-
-  file_picker:find {
-    prompt = 'Live Grep',
-    finder = grepper,
+  local file_picker = pickers.new(opts, {
+    prompt = 'Find Word',
+    finder = finders.new_oneshot_job {'rg', '--vimgrep', search},
+    previewer = previewers.vimgrep,
     sorter = sorters.get_norcalli_sorter(),
-  }
+  }):find()
 end
 
-builtin.oldfiles = function()
-  local oldfiles_finder = finders.new {
-    results = vim.v.oldfiles
-  }
-  local file_picker = pickers.new{}
-
-  file_picker:find {
+builtin.oldfiles = function(opts)
+  pickers.new(opts, {
     prompt = 'Oldfiles',
-    finder = oldfiles_finder,
-    sorter = sorters.get_norcalli_sorter()
-  }
+    finder = finders.new_table(vim.tbl_filter(function(val)
+      return 0 ~= vim.fn.filereadable(val)
+    end, vim.v.oldfiles)),
+    sorter = sorters.get_norcalli_sorter(),
+    previewer = previewers.cat,
+  }):find()
 end
 
 return builtin
diff --git a/lua/telescope/finders.lua b/lua/telescope/finders.lua
index 7866c87..ae32370 100644
--- a/lua/telescope/finders.lua
+++ b/lua/telescope/finders.lua
@@ -1,17 +1,19 @@
 local Job = require('plenary.job')
 
 local log = require('telescope.log')
+local utils = require('telescope.utils')
 
 local finders = {}
 
-
 -- TODO: We should make a few different "FinderGenerators":
 --  SimpleListFinder(my_list)
 --  FunctionFinder(my_func)
 --  JobFinder(my_job_args)
 
 ---@class Finder
-local Finder = {}
+local Finder = {
+  hello = "world"
+}
 
 Finder.__index = Finder
 Finder.__call = function(t, ... ) return t:_find(...) end
@@ -35,7 +37,7 @@ function Finder:new(opts)
   --    string
   --    list
   --    ...
-  return setmetatable({
+  local obj = setmetatable({
     results = opts.results,
 
     fn_command = opts.fn_command,
@@ -45,7 +47,9 @@ function Finder:new(opts)
     -- Maximum number of results to process.
     --  Particularly useful for live updating large queries.
     maximum_results = opts.maximum_results,
-  }, Finder)
+  }, self)
+
+  return obj
 end
 
 -- Probably should use the word apply here, since we're apply the callback passed to us by
@@ -145,8 +149,38 @@ end
 --- Return a new Finder
 --
 --@return Finder
-finders.new = function(...)
-  return Finder:new(...)
+finders.new = function(opts)
+  return Finder:new(opts)
+end
+
+-- TODO: Is this worth making?
+-- finders.new_responsive_job = function(opts)
+--   return finders.new {
+--     maximum_results = get_default(opts.maximum_results, 2000),
+--   }
+-- end
+
+finders.new_oneshot_job = function(command_list)
+  command_list = vim.deepcopy(command_list)
+
+  local command = table.remove(command_list, 1)
+
+  return finders.new {
+    static = true,
+
+    fn_command = function()
+      return {
+        command = command,
+        args = command_list,
+      }
+    end,
+  }
+end
+
+finders.new_table = function(t)
+  return finders.new {
+    results = t
+  }
 end
 
 -- We should add a few utility functions here...
@@ -155,6 +189,6 @@ end
 -- finders.new_one_shot_job
 -- finders.new_table
 
-finders.Finder = Finder
+-- finders.Finder = Finder
 
 return finders
diff --git a/lua/telescope/pickers.lua b/lua/telescope/pickers.lua
index ce01f23..e75f43e 100644
--- a/lua/telescope/pickers.lua
+++ b/lua/telescope/pickers.lua
@@ -1,5 +1,6 @@
 local a = vim.api
 local popup = require('popup')
+local has_devicons, devicons = pcall(require, 'nvim-web-devicons')
 
 local actions = require('telescope.actions')
 local log = require('telescope.log')
@@ -8,15 +9,23 @@ 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 has_devicons, devicons = pcall(require, 'nvim-web-devicons')
+local get_default = utils.get_default
+
+-- TODO: Make this work with deep extend I think.
+local extend = function(opts, defaults)
+  local result = vim.deepcopy(opts or {})
+  for k, v in pairs(defaults or {}) do
+    if result[k] == nil then
+      result[k] = v
+    end
+  end
+
+  return result
+end
 
 local pickers = {}
 
-local ifnil = function(x, was_nil, was_not_nil) if x == nil then return was_nil else return was_not_nil end end
-
 local default_mappings = {
   i = {
     ["<C-n>"] = actions.move_selection_next,
@@ -42,58 +51,60 @@ local default_mappings = {
 local Picker = {}
 Picker.__index = Picker
 
-assert(Sorter)
-assert(Previewer)
-
----@class PickOpts
----@field filter Sorter
----@field maps table
----@field unseen string
-
 --- Create new picker
---- @param opts PickOpts
 function Picker:new(opts)
   opts = opts or {}
 
   return setmetatable({
-    filter = opts.filter,
+    prompt = opts.prompt,
+
+    finder = opts.finder,
+    sorter = opts.sorter,
     previewer = opts.previewer,
-    maps = opts.maps,
+
+    mappings = get_default(opts.mappings, default_mappings),
 
     get_window_options = opts.get_window_options,
-
     selection_strategy = opts.selection_strategy,
+
+    window = {
+      border = get_default(opts.border, {}),
+      borderchars = get_default(opts.borderchars, { '─', '│', '─', '│', '┌', '┐', '┘', '└'}),
+    },
+
+    preview_cutoff = get_default(opts.preview_cutoff, 120),
   }, Picker)
 end
 
-function Picker:get_window_options(max_columns, max_lines, prompt_title, find_options)
-
-  local popup_border = ifnil(find_options.border, {}, find_options.border)
+function Picker:get_window_options(max_columns, max_lines, prompt_title)
+  local popup_border = self.window.border
+  local popup_borderchars = self.window.borderchars
 
   local preview = {
     border = popup_border,
-    borderchars = find_options.borderchars or nil,
+    borderchars = popup_borderchars,
     enter = false,
     highlight = false
   }
 
   local results = {
     border = popup_border,
-    borderchars = find_options.borderchars or nil,
+    borderchars = popup_borderchars,
     enter = false,
   }
 
   local prompt = {
     title = prompt_title,
     border = popup_border,
-    borderchars = find_options.borderchars or nil,
+    borderchars = popup_borderchars,
     enter = true
   }
 
   -- TODO: Test with 120 width terminal
 
   local width_padding = 10
-  if not self.previewer or max_columns < find_options.preview_cutoff then
+  if not self.previewer or max_columns < self.preview_cutoff then
+    width_padding = 2
     preview.width = 0
   elseif max_columns < 150 then
     width_padding = 5
@@ -110,7 +121,7 @@ function Picker:get_window_options(max_columns, max_lines, prompt_title, find_op
 
   local base_height
   if max_lines < 40 then
-    base_height = math.floor(max_lines * 0.5)
+    base_height = math.min(math.floor(max_lines * 0.8), max_lines - 8)
   else
     base_height = math.floor(max_lines * 0.8)
   end
@@ -143,21 +154,10 @@ function Picker:get_window_options(max_columns, max_lines, prompt_title, find_op
   }
 end
 
--- opts.preview_cutoff = 120
-function Picker:find(opts)
-  opts = opts or {}
-
-  if opts.preview_cutoff == nil then
-    opts.preview_cutoff = 120
-  end
-
-  opts.borderchars = opts.borderchars or { '─', '│', '─', '│', '┌', '┐', '┘', '└'}
-
-  local finder = opts.finder
-  assert(finder, "Finder is required to do picking")
-
-  local sorter = opts.sorter
-  local prompt_string = opts.prompt
+function Picker:find()
+  local prompt_string = assert(self.prompt, "Prompt is required.")
+  local finder = assert(self.finder, "Finder is required to do picking")
+  local sorter = self.sorter
 
   self.original_win_id = a.nvim_get_current_win()
 
@@ -165,7 +165,7 @@ function Picker:find(opts)
   -- 1. Prompt window
   -- 2. Options window
   -- 3. Preview window
-  local popup_opts = self:get_window_options(vim.o.columns, vim.o.lines, prompt_string, opts)
+  local popup_opts = self:get_window_options(vim.o.columns, vim.o.lines, prompt_string)
 
   -- TODO: Add back the borders after fixing some stuff in popup.nvim
   local results_win, results_opts = popup.create('', popup_opts.results)
@@ -338,8 +338,7 @@ function Picker:find(opts)
     finder = finder,
   })
 
-  -- mappings.set_keymap(prompt_bufnr, results_bufnr)
-  mappings.apply_keymap(prompt_bufnr, opts.mappings or default_mappings)
+  mappings.apply_keymap(prompt_bufnr, self.mappings)
 
   vim.cmd [[startinsert]]
 end
@@ -462,8 +461,9 @@ function Picker:set_selection(row)
   end
 end
 
-pickers.new = function(...)
-  return Picker:new(...)
+pickers.new = function(opts, defaults)
+  opts = extend(opts, defaults)
+  return Picker:new(opts)
 end
 
 -- TODO: We should consider adding `process_bulk` or `bulk_entry_manager` for things
diff --git a/lua/telescope/utils.lua b/lua/telescope/utils.lua
index 7ddc428..eba24a6 100644
--- a/lua/telescope/utils.lua
+++ b/lua/telescope/utils.lua
@@ -1,5 +1,25 @@
 local utils = {}
 
+utils.if_nil = function(x, was_nil, was_not_nil)
+  if x == nil then
+    return was_nil
+  else
+    return was_not_nil
+  end
+end
+
+utils.get_default = function(x, default)
+  return utils.if_nil(x, default, x)
+end
+
+utils.get_lazy_default = function(x, defaulter, ...)
+  if x == nil then
+    return defaulter(...)
+  else
+    return x
+  end
+end
+
 local function reversedipairsiter(t, i)
   i = i - 1
   if i ~= 0 then
@@ -27,119 +47,31 @@ utils.repeated_table = function(n, val)
   return empty_lines
 end
 
-
-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)
-
+utils.quickfix_items_to_entries = function(locations)
   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)
+  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
+    )
 
-  if not show_values then
-    for k, v in ipairs(results) do
-      results[k] = v[1]
-    end
+    table.insert(results, {
+      valid = true,
+      value = entry,
+      ordinal = vimgrep_str,
+      display = vimgrep_str,
+    })
   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
-
 utils.new_ngram = function()
-  return NGram:new()
+  return require("telescope._private.NGram"):new()
 end
 
 return utils
diff --git a/scratch/rocker_example.lua b/scratch/rocker_example.lua
new file mode 100644
index 0000000..0e73114
--- /dev/null
+++ b/scratch/rocker_example.lua
@@ -0,0 +1,24 @@
+
+
+builtin.git_files = function(opts)
+  opts = opts or {}
+
+  opts.show_preview = get_default(opts.show_preview, true)
+
+  opts.finder = opts.finder or finders.new {
+    static = true,
+
+    fn_command = function()
+      return {
+        command = 'git',
+        args = {'ls-files'}
+      }
+    end,
+  }
+
+  opts.prompt = opts.prompt or 'Simple File'
+  opts.previewer = opts.previewer or previewers.cat
+  opts.sorter = opts.sorter or sorters.get_norcalli_sorter()
+
+  pickers.new(opts):find()
+end