Sample code showing how to add gitsigns support to nvim-scrollview

scrollview-gitsigns.lua

local api = vim.api
local scrollview = require('scrollview')

local group = 'gitsigns'

local add = scrollview.register_sign_spec({
  group = group,
  highlight = 'GitSignsAdd',
  symbol = ' ',
}).name

local change = scrollview.register_sign_spec({
  group = group,
  highlight = 'GitSignsChange',
  symbol = ' ',
}).name

local delete = scrollview.register_sign_spec({
  group = group,
  highlight = 'GitSignsDelete',
  symbol = ' ',
}).name

scrollview.set_sign_group_state(group, enable)

api.nvim_create_autocmd('User', {
  pattern = 'ScrollViewRefresh',
  callback = function()
    if not scrollview.is_sign_group_active(group) then return end
    local success, gitsigns = pcall(require, 'gitsigns')
    if not success then return end
    for _, winid in ipairs(scrollview.get_sign_eligible_windows()) do
      local bufnr = api.nvim_win_get_buf(winid)
      local hunks = gitsigns.get_hunks(bufnr) or {}
      local lines_add = {}
      local lines_change = {}
      local lines_delete = {}
      for _, hunk in ipairs(hunks) do
        if hunk.type == 'add' then
          -- Don't show if the entire column would be covered.
          if hunk.added.count < api.nvim_buf_line_count(bufnr) then
            for line = hunk.added.start, hunk.added.start + hunk.added.count - 1 do
              table.insert(lines_add, line)
            end
          end
        elseif hunk.type == 'change' then
          for line = hunk.added.start, hunk.added.start + hunk.added.count - 1 do
            table.insert(lines_change, line)
          end
        elseif hunk.type == 'delete' then
          table.insert(lines_delete, hunk.added.start)
        end
      end
      vim.b[bufnr][add] = lines_add
      vim.b[bufnr][change] = lines_change
      vim.b[bufnr][delete] = lines_delete
    end
  end
})

api.nvim_create_autocmd('User', {
  pattern = 'GitSignsUpdate',
  callback = function()
    if not scrollview.is_sign_group_active(group) then return end
    vim.cmd('silent! ScrollViewRefresh')
  end
})