[picker]: New action to cd_up when in grep or files picker

[rbhanot4739]

Here is the usecase that some of you might have encountered. You are working on something and jump to library code with lsp go to definition, and then you want to search something in the directory of that library code file. Now this isn't natively possible, I suppose because that file or directory is not in your cwd or project root. Even if your project include that build/site-packages, node-modules type of directory its not efficient because there will huge number of files/directories in those folders and most of the times you are interested in searching a particular directory.

So in order to solve this, I added a mapping that lets me grep in adjacent directory of currently opened file and then define a custom action mapped to a key that sets the cwd of the picker to one level up. Combining these two things gives me a nice workflow which mimics a feature from i used to like from IntellIJ. Here is how I did it

local function cd_up(picker, _)
  local snacks = require("snacks")
  local cwd = picker.input.filter.cwd
  local picker_type = picker.opts.source
  picker:close()
  if picker_type == "grep" then
    local pattern = picker.input.filter.search or ""
    snacks.picker.grep({ cwd = vim.fs.dirname(cwd), search = pattern })
  else
    local pattern = picker.input.filter.pattern or ""
    snacks.picker.files({ cwd = vim.fs.dirname(cwd), search = pattern })
  end
end

And here is how I map it

grep = {
          actions = {
            cd_up = function(picker, _)
              cd_up(picker, _)
            end,
          },
          win = {
            input = {
              keys = {
                ["<c-u>"] = { "cd_up", desc = "cd_up", mode = { "i", "n" } },
              },
            },
          },
        }

Finally, this mapping will bring it all together.

{
      "<leader>sa",
      function()
        Snacks.picker.grep({ cwd = vim.fn.expand("%:p:h") })
      end,
      desc = "Find adjacent files",
    }

Is there a way to update the cwd of the picker without having to close/reopen it again? Also Please share your feedback/ideas if you find this useful and/or how I can improve it.