fix: Reduce memory leaks (#148)

It is not 100% clear that we've gotten ALL the memory leaks, but it
seems much much much better and doesn't look like it's going to die
immediately or as often anymore :)

lua/tests/manual/newline_tables.lua

@@ -1,15 +1,23 @@
-require('plenary.reload').reload_module('telescope')
+-- require('plenary.reload').reload_module('telescope')
 
 local finders = require('telescope.finders')
 local pickers = require('telescope.pickers')
 local sorters = require('telescope.sorters')
+local previewers = require('telescope.previewers')
 
-local my_list = {'a', 'b', 'c'}
+local my_list = {
+  'lua/telescope/WIP.lua',
+  'lua/telescope/actions.lua',
+  'lua/telescope/builtin.lua',
+}
 
-pickers.new({
+local opts = {}
+
+pickers.new(opts, {
   prompt    = 'Telescope Builtin',
   finder    = finders.new_table {
     results = my_list,
   },
   sorter    = sorters.get_generic_fuzzy_sorter(),
+  previewer = previewers.cat.new(opts),
 }):find()

lua/tests/manual/reference_tracker.lua

@@ -0,0 +1,48 @@
+
+-- local actions = require('telescope.actions')
+-- local utils = require('telescope.utils')
+require('telescope')
+local finders = require('telescope.finders')
+local make_entry = require('telescope.make_entry')
+local previewers = require('telescope.previewers')
+local pickers = require('telescope.pickers')
+local sorters = require('telescope.sorters')
+
+local log = require('telescope.log')
+
+local real_opts = setmetatable({}, { __mode = 'v' })
+local opts = setmetatable({}, { 
+  __index = function(t, k) log.debug("accessing:", k); return real_opts[k] end,
+  __newindex = function(t, k, v) log.debug("setting:", k, v); real_opts[k] = v end
+})
+
+opts.entry_maker = opts.entry_maker or make_entry.gen_from_file()
+if opts.cwd then
+  opts.cwd = vim.fn.expand(opts.cwd)
+end
+
+-- local get_finder_opts = function(opts)
+--   local t = {}
+--   t.entry_maker = table.pop(opts, 'entry_maker')
+--   return t
+-- end
+
+-- local finder_opts = get_finder_opts(opts)
+-- assert(not opts.entry_maker)
+
+local picker_config = {
+  prompt    = 'Git File',
+  finder    = finders.new_oneshot_job(
+    { "git", "ls-files", "-o", "--exclude-standard", "-c" }
+    , opts
+  ),
+  -- previewer = previewers.cat.new(opts),
+  -- sorter    = sorters.get_fuzzy_file(opts),
+  -- sorter    = sorters.get_fuzzy_file(),
+}
+
+log.debug("Done with config")
+
+local x = pickers.new(picker_config)
+x:find()
+x = nil