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local utils = require "telescope.utils"
local Previewer = {}
Previewer.__index = Previewer
local force_function_wrap = function(value)
if value ~= nil then
if type(value) ~= "function" then
return function()
return tostring(value)
end
else
return value
end
end
end
function Previewer:new(opts)
opts = opts or {}
return setmetatable({
state = nil,
_title_fn = force_function_wrap(opts.title),
_dyn_title_fn = force_function_wrap(opts.dyn_title),
_setup_func = opts.setup,
_teardown_func = opts.teardown,
_send_input = opts.send_input,
_scroll_fn = opts.scroll_fn,
preview_fn = opts.preview_fn,
_empty_bufnr = nil,
}, Previewer)
end
function Previewer:preview(entry, status)
if not entry then
if not self._empty_bufnr then
self._empty_bufnr = vim.api.nvim_create_buf(false, true)
end
if vim.api.nvim_buf_is_valid(self._empty_bufnr) then
vim.api.nvim_win_set_buf(status.preview_win, self._empty_bufnr)
end
return
end
if not self.state then
if self._setup_func then
self.state = self:_setup_func(status)
else
self.state = {}
end
end
return self:preview_fn(entry, status)
end
function Previewer:title(entry, dynamic)
if dynamic == true and self._dyn_title_fn ~= nil then
if entry == nil then
if self._title_fn ~= nil then
return self:_title_fn()
else
return ""
end
end
return self:_dyn_title_fn(entry)
end
if self._title_fn ~= nil then
return self:_title_fn()
end
end
function Previewer:teardown()
if self._empty_bufnr then
utils.buf_delete(self._empty_bufnr)
end
if self._teardown_func then
self:_teardown_func()
end
end
function Previewer:send_input(input)
if self._send_input then
self:_send_input(input)
else
vim.api.nvim_err_writeln "send_input is not defined for this previewer"
end
end
function Previewer:scroll_fn(direction)
if self._scroll_fn then
self:_scroll_fn(direction)
else
vim.api.nvim_err_writeln "scroll_fn is not defined for this previewer"
end
end
return Previewer
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