nvim-config/lua/custom/plugins/conflictmarker.lua

-- Disable the default highlight group
vim.g.conflict_marker_highlight_group = ''

-- Include text after begin and end markers
vim.g.conflict_marker_begin = '^<<<<<<< .*$'
vim.g.conflict_marker_end = '^>>>>>>> .*$'

-- Highlight groups
vim.cmd 'highlight ConflictMarkerBegin guibg=#2f7366'
vim.cmd 'highlight ConflictMarkerOurs guibg=#2e5049'
vim.cmd 'highlight ConflictMarkerTheirs guibg=#344f69'
vim.cmd 'highlight ConflictMarkerEnd guibg=#2f628e'
vim.cmd 'highlight ConflictMarkerCommonAncestorsHunk guibg=#754a81'

-- Git conflict marker management plugin
return {
  'rhysd/conflict-marker.vim',
  config = function()
    -- Read all lines in buffer, check if there is any conflict marker
    function git_conflict_detection()
      local lines = vim.api.nvim_buf_get_lines(0, 0, -1, false)
      -- Check if strict regex is contained in any line
      local beginning = vim.fn.match(lines, vim.g.conflict_marker_begin)
      local ending = vim.fn.match(lines, vim.g.conflict_marker_end)
      if beginning > -1 or ending > -1 then
        vim.diagnostic.enable(false)
      else
        vim.diagnostic.enable(true)
      end
    end

    -- Autocommand to disable diagnostics on buffer enter
    vim.api.nvim_create_autocmd('BufRead', {
      group = vim.api.nvim_create_augroup('git-conflict-lsp-disable', { clear = true }),
      callback = git_conflict_detection,
    })
    -- Autocommand to disable diagnostics on save
    vim.api.nvim_create_autocmd('BufWritePre', {
      group = vim.api.nvim_create_augroup('git-conflict-lsp-disable', { clear = false }),
      callback = git_conflict_detection,
    })
  end,
}