diff --git a/lua/telescope/WIP.lua b/lua/telescope/WIP.lua
new file mode 100644
index 0000000..cab745a
--- /dev/null
+++ b/lua/telescope/WIP.lua
@@ -0,0 +1,61 @@
+
+local finders = require('telescope.finders')
+local previewers = require('telescope.previewers')
+local pickers = require('telescope.pickers')
+local sorters = require('telescope.sorters')
+
+local WIP = {}
+
+WIP.git_diff = function()
+  local file_picker = pickers.new {
+    previewer = previewers.new_termopen {
+      command = "git diff %s"
+    },
+  }
+
+  file_picker:find {
+    prompt = "Git Diff Viewier",
+
+    finder = finders.new {
+      static = true,
+
+      fn_command = function()
+        return {
+          command = 'git',
+          args = {'ls-files', '-m'}
+        }
+      end,
+    },
+
+    sorter = sorters.get_norcalli_sorter()
+  }
+end
+
+-- TODO: Make it so that when you select stuff, it's inserted
+-- TODO: Make it so the previewer shows the help text.
+WIP.completion = function()
+  local results = {}
+  for k, v in pairs(vim.api) do
+    table.insert(results, k)
+  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
+
+-- TODO: Use tree sitter to get "everything" in your current scope / file / etc.
+-- Fuzzy find ofver it, go to its definition.
+
+return WIP
diff --git a/lua/telescope/actions.lua b/lua/telescope/actions.lua
index a03323b..abd5bf8 100644
--- a/lua/telescope/actions.lua
+++ b/lua/telescope/actions.lua
@@ -1,9 +1,14 @@
 -- Actions functions that are useful for people creating their own mappings.
 
+local a = vim.api
+
 local state = require('telescope.state')
 
-local actions = {}
-
+local actions = setmetatable({}, {
+  __index = function(t, k)
+    error("Actions does not have a value: " .. tostring(k))
+  end
+})
 
 --- Get the current picker object for the prompt
 function actions.get_current_picker(prompt_bufnr)
@@ -16,10 +21,62 @@ function actions.shift_current_selection(prompt_bufnr, change)
   actions.get_current_picker(prompt_bufnr):move_selection(change)
 end
 
+function actions.move_selection_next(prompt_bufnr)
+  actions.shift_current_selection(prompt_bufnr, 1)
+end
+
+function actions.move_selection_previous(prompt_bufnr)
+  actions.shift_current_selection(prompt_bufnr, -1)
+end
+
 --- Get the current entry
 function actions.get_selected_entry(prompt_bufnr)
   return actions.get_current_picker(prompt_bufnr):get_selection()
 end
 
+function actions.goto_file_selection(prompt_bufnr)
+  local picker = actions.get_current_picker(prompt_bufnr)
+  local entry = actions.get_selected_entry(prompt_bufnr)
+
+  if not entry then
+    print("[telescope] Nothing currently selected")
+    return
+  else
+    local value = entry.value
+    if not value then
+      print("Could not do anything with blank line...")
+      return
+    end
+
+    -- TODO: This is not great.
+    if type(value) == "table" then
+      value = entry.display
+    end
+
+    local sections = vim.split(value, ":")
+
+    local filename = sections[1]
+    local row = tonumber(sections[2])
+    local col = tonumber(sections[3])
+
+    vim.cmd(string.format([[bwipeout! %s]], prompt_bufnr))
+
+    a.nvim_set_current_win(picker.original_win_id or 0)
+    vim.cmd(string.format(":e %s", filename))
+
+    local bufnr = vim.api.nvim_get_current_buf()
+    a.nvim_buf_set_option(bufnr, 'buflisted', true)
+    if row and col then
+      a.nvim_win_set_cursor(0, {row, col})
+    end
+
+    vim.cmd [[stopinsert]]
+  end
+end
+
+actions.close = function(prompt_bufnr)
+  vim.cmd(string.format([[bwipeout! %s]], prompt_bufnr))
+end
+
 
 return actions
diff --git a/lua/telescope/builtin.lua b/lua/telescope/builtin.lua
index 7aa255b..4542108 100644
--- a/lua/telescope/builtin.lua
+++ b/lua/telescope/builtin.lua
@@ -18,9 +18,6 @@ builtin.git_files = function(opts)
 
   local show_preview = ifnil(opts.show_preview, true, opts.show_preview)
 
-  -- TODO: Auto select bottom row
-  -- TODO: filter out results when they don't match at all anymore.
-
   local file_finder = finders.new {
     static = true,
 
@@ -236,6 +233,4 @@ builtin.grep_string = function(opts)
   }
 end
 
-
-
 return builtin
diff --git a/lua/telescope/finders.lua b/lua/telescope/finders.lua
index 6fa4099..7866c87 100644
--- a/lua/telescope/finders.lua
+++ b/lua/telescope/finders.lua
@@ -149,6 +149,12 @@ finders.new = function(...)
   return Finder:new(...)
 end
 
+-- We should add a few utility functions here...
+--
+-- finders.new_job
+-- finders.new_one_shot_job
+-- finders.new_table
+
 finders.Finder = Finder
 
 return finders
diff --git a/lua/telescope/mappings.lua b/lua/telescope/mappings.lua
index 38c664a..ba618d4 100644
--- a/lua/telescope/mappings.lua
+++ b/lua/telescope/mappings.lua
@@ -1,17 +1,36 @@
 -- TODO: Customize keymap
 local a = vim.api
 
-local actions = require('telescope.actions')
-local state = require('telescope.state')
-
 local mappings = {}
-local keymap = {}
 
-local keymap_store = {}
+local keymap_store = setmetatable({}, {
+  __index = function(t, k)
+    rawset(t, k, {})
+
+    return rawget(t, k)
+  end
+})
+
+local _mapping_key_id = 0
+local get_next_id = function()
+  _mapping_key_id = _mapping_key_id + 1
+  return _mapping_key_id
+end
+
+local assign_function = function(prompt_bufnr, func)
+  local func_id = get_next_id()
+
+  keymap_store[prompt_bufnr][func_id] = func
+
+  return func_id
+end
+
 
 --[[
+Usage:
+
 mappings.apply_keymap(42, {
-  normal = {
+  n = {
     ["<leader>x"] = "just do this string",
 
     ["<CR>"] = function(picker, prompt_bufnr)
@@ -21,11 +40,49 @@ mappings.apply_keymap(42, {
       vim.cmd(string.format(":e %s", filename))
     end,
   },
-  insert = {
+
+  i = {
   }
 })
 --]]
 mappings.apply_keymap = function(prompt_bufnr, buffer_keymap)
+  for mode, mode_map in pairs(buffer_keymap) do
+    for key_bind, key_func in pairs(mode_map) do
+      if type(key_func) == "string" then
+        a.nvim_buf_set_keymap(
+          prompt_bufnr,
+          mode,
+          key_bind,
+          key_func,
+          {
+            silent = true
+          }
+        )
+      else
+        local key_id = assign_function(prompt_bufnr, key_func)
+        local prefix = ""
+        if mode == "i" then
+          prefix = "<C-O>"
+        end
+
+        a.nvim_buf_set_keymap(
+          prompt_bufnr,
+          mode,
+          key_bind,
+          string.format(
+            "%s:lua require('telescope.mappings').execute_keymap(%s, %s)<CR>",
+            prefix,
+            prompt_bufnr,
+            key_id
+          ),
+          {
+            silent = true
+          }
+        )
+
+      end
+    end
+  end
 
   vim.cmd(string.format(
     [[autocmd BufDelete %s :lua require('telescope.mappings').clear(%s)]],
@@ -34,95 +91,23 @@ mappings.apply_keymap = function(prompt_bufnr, buffer_keymap)
   ))
 end
 
+mappings.execute_keymap = function(prompt_bufnr, keymap_identifier)
+  local key_func = keymap_store[prompt_bufnr][keymap_identifier]
+
+  assert(
+    key_func,
+    string.format(
+      "Unsure of how we got this failure: %s %s",
+      prompt_bufnr,
+      keymap_identifier
+    )
+  )
+
+  key_func(prompt_bufnr)
+end
+
 mappings.clear = function(prompt_bufnr)
   keymap_store[prompt_bufnr] = nil
 end
 
-mappings.set_keymap = function(prompt_bufnr, results_bufnr)
-  local function default_mapper(mode, map_key, table_key)
-    a.nvim_buf_set_keymap(
-      prompt_bufnr,
-      mode,
-      map_key,
-      string.format(
-        [[<C-O>:lua __TelescopeMapping(%s, %s, '%s')<CR>]],
-        prompt_bufnr,
-        results_bufnr,
-        table_key
-        ),
-      {
-        silent = true,
-      }
-    )
-  end
-
-  default_mapper('i', '<c-n>', 'next_selection')
-  default_mapper('i', '<c-p>', 'previous_selection')
-  default_mapper('i', '<CR>', 'enter')
-
-  default_mapper('n', '<esc>', 'escape')
-end
-
-
-function __TelescopeMapping(prompt_bufnr, results_bufnr, characters)
-  if keymap[characters] then
-    keymap[characters](prompt_bufnr, results_bufnr)
-  end
-end
-
--- TODO: Refactor this to use shared code.
--- TODO: Move from top to bottom, etc.
--- TODO: It seems like doing this brings us back to the beginning of the prompt, which is not great.
-keymap["next_selection"] = function(prompt_bufnr, _)
-  actions.shift_current_selection(prompt_bufnr, 1)
-end
-
-keymap["previous_selection"] = function(prompt_bufnr, _)
-  actions.shift_current_selection(prompt_bufnr, -1)
-end
-
-keymap["enter"] = function(prompt_bufnr, results_bufnr)
-  local picker = actions.get_current_picker(prompt_bufnr)
-  local entry = actions.get_selected_entry(prompt_bufnr)
-
-  if not entry then
-    print("[telescope] Nothing currently selected")
-    return
-  else
-    local value = entry.value
-    if not value then
-      print("Could not do anything with blank line...")
-      return
-    end
-
-    -- TODO: This is not great.
-    if type(value) == "table" then
-      value = entry.display
-    end
-
-    local sections = vim.split(value, ":")
-
-    local filename = sections[1]
-    local row = tonumber(sections[2])
-    local col = tonumber(sections[3])
-
-    vim.cmd(string.format([[bwipeout! %s]], prompt_bufnr))
-
-    a.nvim_set_current_win(picker.original_win_id or 0)
-    vim.cmd(string.format(":e %s", filename))
-
-    local bufnr = vim.api.nvim_get_current_buf()
-    a.nvim_buf_set_option(bufnr, 'buflisted', true)
-    if row and col then
-      a.nvim_win_set_cursor(0, {row, col})
-    end
-
-    vim.cmd [[stopinsert]]
-  end
-end
-
-keymap["escape"] = function(prompt_bufnr)
-  vim.cmd(string.format([[bwipeout! %s]], prompt_bufnr))
-end
-
 return mappings
diff --git a/lua/telescope/pickers.lua b/lua/telescope/pickers.lua
index 4a08262..ce01f23 100644
--- a/lua/telescope/pickers.lua
+++ b/lua/telescope/pickers.lua
@@ -1,6 +1,7 @@
 local a = vim.api
 local popup = require('popup')
 
+local actions = require('telescope.actions')
 local log = require('telescope.log')
 local mappings = require('telescope.mappings')
 local state = require('telescope.state')
@@ -16,6 +17,18 @@ 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,
+    ["<C-p>"] = actions.move_selection_previous,
+    ["<CR>"] = actions.goto_file_selection,
+  },
+
+  n = {
+    ["<esc>"] = actions.close,
+  },
+}
+
 -- Picker takes a function (`get_window_options`) that returns the configurations required for three windows:
 --  prompt
 --  results
@@ -325,7 +338,8 @@ function Picker:find(opts)
     finder = finder,
   })
 
-  mappings.set_keymap(prompt_bufnr, results_bufnr)
+  -- mappings.set_keymap(prompt_bufnr, results_bufnr)
+  mappings.apply_keymap(prompt_bufnr, opts.mappings or default_mappings)
 
   vim.cmd [[startinsert]]
 end
diff --git a/lua/telescope/previewers.lua b/lua/telescope/previewers.lua
index 3e79ad3..4743639 100644
--- a/lua/telescope/previewers.lua
+++ b/lua/telescope/previewers.lua
@@ -34,6 +34,27 @@ previewers.new = function(...)
   return Previewer:new(...)
 end
 
+previewers.new_termopen = function(opts)
+  local entry_value = opts.get_value or function(entry)
+    return entry.value
+  end
+
+  local command_string = opts.command
+
+  return previewers.new {
+    preview_fn = function(_, 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(command_string, entry_value(entry)))
+      vim.cmd(string.format("noautocmd call win_gotoid(%s)", status.prompt_win))
+    end
+  }
+end
+
 previewers.vim_buffer = previewers.new {
   preview_fn = function(_, entry, status)
     local value = entry.value