Help with a custom definition for Find/Delete/Replace - Add already working

[DominikMendel]

I have created this pattern which I have been absolutely loving:

    local function get_matching_delims(string_left_delimiter, string_right_delimiter)
      local prompt = "Enter the left delimiter to be surrounded by '"
        .. string_left_delimiter
        .. " "
        .. string_right_delimiter
        .. "' (Can add multiple, i.e., 'Array Gd': "
      local base_delimiter = config.get_input(prompt)
      -- Replace spaces with "the left delimiter"
      local left_delimiter = string.gsub(base_delimiter, " ", string_left_delimiter)

      local right_delimiter = string_right_delimiter
      -- Ballance any added "left delimiters"
      for char in string.gmatch(left_delimiter, ".") do
        if char == string_left_delimiter then right_delimiter = right_delimiter .. string_right_delimiter end
      end
      left_delimiter = left_delimiter .. string_left_delimiter
      return { { left_delimiter }, { right_delimiter } }
    end
...
      surrounds = {
        ["("] = {
          add = function() return get_matching_delims("(", ")") end,
          find = function() end,
          delete = function() end,
        },
      }

This allows me to do normal parentheses surround with ) but if I do ( I am prompted for something where I can put foo and it will surround bar with foo(bar). Very handy for other things like some_type<foo> etc.

However, I don't really know how best to extend this to the find/delete or whatever is needed for me to do cs< (change the surrounding < custom definition).
Any help here would be great.

I've looked at the docs but couldn't get any traction. I essentially need my < behavior to be similar to the > behavior, but it has the added left_delimiter = some_non_white_space_string<.

[kylechui]

I'm not exactly sure what you are trying to do here (specifically not sure what you mean by < behavior since your code snippet has parentheses), but here's the relevant code from the default configuration: https://github.com/kylechui/nvim-surround/blob/main/lua/nvim-surround/config.lua#L192

[DominikMendel]

I'm not exactly sure what you are trying to do here (specifically not sure what you mean by < behavior since your code snippet has parentheses), but here's the relevant code from the default configuration: https://github.com/kylechui/nvim-surround/blob/main/lua/nvim-surround/config.lua#L192

Yeah sorry I was a bit unclear. My ( and < behavior is the same.

If I have foo(bar) and cursor is in bar, I would like to be able to do a cs(TEST which would replace the prefix word like so TEST(foo)
I think this is somewhat similar behavior to the Tags surround, but used more so with coding syntax.

[kylechui]

I actually think that this would be more similar to the function surround; you can probably modify the < surround's find/delete bindings to match the one I linked previously, but update the pattern to match on %b<> pair instead of %b()

[DominikMendel]

Ok I see, thank you for the clarification. So for my ( I changes it to:

        ["("] = {
          add = function() return get_matching_delims("(", ")") end,
          find = function() return require("nvim-surround.config").get_selection({ pattern = "[^=%s%(%){}]+%b()" }) end,
          delete = "^(.-%()().-(%))()$",
          change = {
            target = "^.-([%w_]+)()%(.-%)()()$",
            replacement = function()
              local result = require("nvim-surround.config").get_input("Enter the function name: ")
              if result then return { { result }, { "" } } end
            end,
          },
        },

And this works just as expected!
However, I don't think I can just replace the %b() to %b<> for my < keybind. I think I need to change something in the delete and target as well? Could you assisst? Lots of () going on in this strings.

What I have now where only add is working:

        ["<"] = {
          add = function() return get_matching_delims("<", ">") end,
          find = function() return require("nvim-surround.config").get_selection({ pattern = "[^=%s%(%){}]+%b<>" }) end,
          delete = "^(.-%()().-(%))()$",
          change = {
            target = "^.-([%w_]+)()%(.-%)()()$",
            replacement = function()
              local result = require("nvim-surround.config").get_input("Enter the function name: ")
              if result then return { { result }, { "" } } end
            end,
          },

[kylechui]

Ah yes, in the delete/change.target strings you should see exactly one pair of escaped parens (i.e. %( and %)). Replace each of the escaped parens with its respective angle bracket, i.e. %( → < and %) → >.

[DominikMendel]

This was it! Very helpful, thank you so much :)