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scratch/file_finder.lua

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+local telescope = require('telescope')
+
+-- Goals:
+-- 1. You pick a directory
+-- 2. We `git ls-files` in that directory ONCE and ONLY ONCE to get the results.
+-- 3. You can fuzzy find those results w/ fzf
+-- 4. Select one and go to file.
+
+
+--[[
+ls_files_job.start()
+fzf_job.stdin = ls_files_job.stdout
+
+  self.stdin = vim.loop.new_pipe(false)
+  -> self.stdin = finder.stdout
+
+
+  -- Finder:
+  intermediary_pipe = self.stdout
+
+  -- repeat send this pipe when we want to get new filtering
+  self.stdin = intermediary_pipe
+
+
+  -- Filter + Sort
+  ok, we could do scoring + cutoff and have that always be the case.
+
+  OR
+
+  filter takes a function, signature (prompt: str, line: str): number
+
+  => echo $line | fzf --filter "prompt"
+      return stdout != ""
+
+  => lua_fuzzy_finder(prompt, line) return true if good enough
+
+  TODO: Rename everything to be more clear like the name below.
+  IFilterSorterAbstractFactoryGeneratorv1ProtoBeta
+
+--]]
+
+local string_distance = require('telescope.algos.string_distance')
+
+local file_finder = telescope.finders.new {
+  fn_command = function(self, prompt)
+    -- todo figure out how to cache this later
+    if false then
+      if self[prompt] == nil then
+        self[prompt] = nil
+      end
+
+      return self[prompt]
+    else
+      return 'git ls-files'
+    end
+  end,
+}
+
+local file_sorter = telescope.sorters.new {
+  scoring_function = function(self, prompt, line)
+    if prompt == '' then return 0 end
+    if not line then return -1 end
+
+    local dist = string_distance(prompt, line)
+    -- if dist > (0.75 * #line) and #prompt > 3 then
+    --   return -1
+    -- end
+
+    return dist
+  end
+}
+
+local file_previewer = telescope.previewers.vim_buffer
+
+local file_picker = telescope.pickers.new {
+  previewer = file_previewer
+}
+
+file_picker:find {
+  prompt = 'Find File',
+  finder = file_finder,
+  sorter = file_sorter,
+}
+