{ nix2lua, vim, lib, ... }:

with nix2lua.lib;

{ configs ? { }
, keymaps ? [
    { mode = "n"; bind = "]h"; command = raw "next_hunk"; }
    { mode = "n"; bind = "[h"; command = raw "prev_hunk"; }
    { mode = "n"; bind = "<leader>gs"; command = raw "gs.stage_hunk"; }
    { mode = "n"; bind = "<leader>gr"; command = raw "gs.reset_hunk"; }
    { mode = "n"; bind = "<leader>gu"; command = raw "gs.undo_stage_hunk"; }
    { mode = "n"; bind = "<leader>gp"; command = raw "gs.preview_hunk"; }
    { mode = "n"; bind = "<leader>gb"; command = lambda0 (call "gs.blame_line" { full = true; }); }
    { mode = "n"; bind = "<leader>gd"; command = raw "gs.diffthis"; }
    { mode = "n"; bind = "<leader>gD"; command = lambda0 (call "gs.diffthis" "~"); }
    { mode = "n"; bind = "<leader>gtb"; command = raw "gs.toggle_current_line_blame"; }
    { mode = "n"; bind = "<leader>gtd"; command = raw "gs.toggle_deleted"; }
  ]
}:

let
  bufferedKeymaps = map (args: lib.recursiveUpdate args { opts.buffer = var "bufnr"; }) keymaps;
in
{
  gitsigns-nvim = [
    (local (func "on_attach" [ "bufnr" ] (
      [
        (local (set "gs" (var "package.loaded.gitsigns")))

        (local (func0 "next_hunk"
          (ifelse (var "vim.wo.diff")
            (call1 "vim.cmd.normal" [ "]h" (nf "bang" true) ])
            (call1 "gs.nav_hunk" "next")
          )
        ))
        (local (func0 "prev_hunk"
          (ifelse (var "vim.wo.diff")
            (call1 "vim.cmd.normal" [ "[h" (nf "bang" true) ])
            (call1 "gs.nav_hunk" "prev"))
        ))
      ]
      ++ map vim.keymap.set bufferedKeymaps
    )))

    (pipe1
      (require "gitsigns")
      (call "setup" (configs // {
        on_attach = var "on_attach";
      }))
    )
  ];

}