[FEATURE] Change filetype for image previewed buffers and export callback function

[pysan3]

Hi, sorry for spamming you with feature requests lol.

While doing the integration to neo-tree I needed to detect the buffers that the images where loaded in.
And I would like to propose two feature requests regarding this issue.

1. Set vim.bo[buf].filetype to something plugin specific.

If you can set a filetype to the buffer on BufRead, it would be much easier to render the preview.

local buf = ...
vim.bo[buf].filetype = "image_nvim" -- or "image_nvim_png" etc would be nice too if possible

2. Export hijack buffer function to be called from outside.

It would be nice if I can call the hijack buffer code (basically the callback of the current autocmd) from outside as an API.

---@param path string
---@param win number? if nil or 0, uses current window
---@param buf number? if nil or 0, uses current buffer
---@param options ImageOptions?
api.hijack_buffer = function(path, win, buf, options)
  if not win or win == 0 then win = vim.api.nvim_get_current_win() end
  if not buf or buf == 0 then buf = vim.api.nvim_get_current_buf() end
  vim.bo[buf].modifiable = true
  vim.api.nvim_buf_set_lines(buf, 0, -1, true, { "" })

  vim.bo[buf].modifiable = false
  vim.bo[buf].buftype = "nowrite"
  vim.opt_local.colorcolumn = "0"
  vim.opt_local.cursorline = false
  vim.opt_local.number = false
  vim.opt_local.signcolumn = "no"

  -- vim.bo[buf].filetype = ...

  options = options or {}
  options.window = win
  options.buffer = buf
  local img = api.from_file(path, options)
  img:render()
  return img
end

---

Thanks in advance.

[3rd]

Both ideas are great, will get them in!

[3rd]

Done, let me know if you find any issues!
The ft is image_nvim, without the extension, but you can call hijack_buffer multiple times on the same window+pair to get the image if you need any internals. All the images are converted to png through magick.

[pysan3]

Thank you very much for your quick response.

you can call hijack_buffer multiple times on the same window+pair to get the image if you need any internals

This is amazing!

All the images are converted to png through magick.

Ah, now I know why it takes a bit longer to load jpg images even when they are small for the first time (I'm on a very low spec PC lol).