feat(neovim): create helper function that allows me to eval highlighted lua code

modules/home-manager/programs/neovim/polish.lua

@@ -51,6 +51,38 @@ vim.fn.getnixpath = function(packagename, packageoutput)
   )[3]
 end
 
+--- Helper function to allow me to run commands grabbed
+--- by the current selection.
+--- @param isLua boolean
+--- @return string
+vim.fn.runcmdonmark = function(isLua)
+  local beginRow, beginCol = unpack(vim.api.nvim_buf_get_mark(0, "<"))
+  local endRow, endCol = unpack(vim.api.nvim_buf_get_mark(0, ">"))
+
+  if beginRow == nil or beginCol == nil or endRow == nil or endCol == nil then
+    return ""
+  end
+
+  local text = table.concat(
+    vim.tbl_map(function(incoming)
+      return vim.trim(incoming)
+    end, vim.api.nvim_buf_get_text(0, beginRow - 1, beginCol, endRow - 1, endCol + 1, {})),
+    " "
+  )
+
+  vim.notify("Running expression: " .. text, vim.log.levels.INFO)
+
+  return vim.api.nvim_cmd(
+    vim.api.nvim_parse_cmd((isLua == true and ":lua " or "") .. text, {}) --[[@as vim.api.keyset.cmd]],
+    {}
+  )
+end
+
+--- Register the function as a command as well, to facilitate things.
+vim.api.nvim_create_user_command("RunCmdOnMark", function(opts)
+  vim.fn.runcmdonmark((opts.args == "v:false" or opts.args == "false") and false or true)
+end, { range = true, nargs = "?" })
+
 local dap = require("dap")
 
 -- @type DapAdapter