Can fzf_exec preview plain string?

[sharpchen]

I'd like to preview some string content from in memory table not actual file, is it possible to preview a string directly?

-- something like this would be good
fzf.fzf_exec({ { name = "1: foo", content = "print [[hello from lua]]", filetype = 'lua' } })

[ibhagwan]

:lua FzfLua.fzf_exec({"1: name"}, { preview = function(sel, opts) return "content" end})

Have a separate metadata table for the preview, parse the index using index = sel[1]:match("(%d+):") and access your content with something like metadata[index].

[sharpchen]

I see. It is possible to preview with syntax highlighting from treesitter?

[ibhagwan]

I see. It is possible to preview with syntax highlighting from treesitter?

Yes but you will need to use the builtin neovim win preview, see the advanced wiki how to do that.

[sharpchen]

Thanks, was able to do like this:

local builtin = require('fzf-lua.previewer.builtin')
local StringPreviewer = builtin.base:extend()

local external_table = {
  {
    name = 'foo',
    filetype = 'lua',
    content = [[print "hello world"]],
  },
}

function StringPreviewer:new(o, opts, fzf_win)
  StringPreviewer.super.new(self, o, opts, fzf_win)
  setmetatable(self, StringPreviewer)
  return self
end

function StringPreviewer:populate_preview_buf(entry_str)
  ---@cast entry_str string
  local idx = tonumber(entry_str:match('(%d+):'))
  local ft = external_table[idx].filetype

  local tmpbuf = self:get_tmp_buffer()
  vim.api.nvim_buf_set_lines(tmpbuf, 0, -1, false, { external_table[idx].content })
  vim.bo[tmpbuf].filetype = ft
  self:set_preview_buf(tmpbuf)
  -- self.win:update_scrollbar()
end

function StringPreviewer:gen_winopts()
  local new_winopts = {
    wrap = false,
    number = true,
    cursorline = false,
  }
  return vim.tbl_extend('force', self.winopts, new_winopts)
end

require('fzf-lua').fzf_exec({ '1: foo' }, {
  previewer = StringPreviewer,
})

[sharpchen]

One more question, how do I highlight the entry_str, such as highlighting filetype icon?

[ibhagwan]

One more question, how do I highlight the entry_str, such as highlighting filetype icon?

Not sure I understand, highlight inside the preview or in the main fzf window? icons should already have a highlight in the main window

[sharpchen]

I mean the file icon in the entry_str in main window, just like fzf.files, I manually formatted the strings and passed them to fzf.fzf_exec(entry_str_with_icon, {}) but didn't seem to work.